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-rw-r--r--fpga/usrp2/gpif/Makefile.srcs15
-rw-r--r--fpga/usrp2/gpif/gpif.v185
-rw-r--r--fpga/usrp2/gpif/gpif_rd.v111
-rw-r--r--fpga/usrp2/gpif/gpif_tb.v142
-rw-r--r--fpga/usrp2/gpif/gpif_wr.v95
-rw-r--r--fpga/usrp2/gpif/gpif_wr_tb.v110
-rwxr-xr-xfpga/usrp2/gpif/lint2
-rw-r--r--fpga/usrp2/gpif/packet_reframer.v70
-rw-r--r--fpga/usrp2/gpif/packet_splitter.v123
-rw-r--r--fpga/usrp2/gpif/packet_splitter_tb.v137
-rw-r--r--fpga/usrp2/gpif/slave_fifo.v473
11 files changed, 1463 insertions, 0 deletions
diff --git a/fpga/usrp2/gpif/Makefile.srcs b/fpga/usrp2/gpif/Makefile.srcs
new file mode 100644
index 000000000..06cde8afa
--- /dev/null
+++ b/fpga/usrp2/gpif/Makefile.srcs
@@ -0,0 +1,15 @@
+#
+# Copyright 2010 Ettus Research LLC
+#
+
+##################################################
+# SERDES Sources
+##################################################
+GPIF_SRCS = $(abspath $(addprefix $(BASE_DIR)/../gpif/, \
+gpif.v \
+gpif_wr.v \
+gpif_rd.v \
+packet_reframer.v \
+packet_splitter.v \
+slave_fifo.v \
+))
diff --git a/fpga/usrp2/gpif/gpif.v b/fpga/usrp2/gpif/gpif.v
new file mode 100644
index 000000000..e5b63d5a3
--- /dev/null
+++ b/fpga/usrp2/gpif/gpif.v
@@ -0,0 +1,185 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+//////////////////////////////////////////////////////////////////////////////////
+
+module gpif
+ #(parameter TXFIFOSIZE = 11, parameter RXFIFOSIZE = 11)
+ (// GPIF signals
+ input gpif_clk, input gpif_rst,
+ inout [15:0] gpif_d, input [3:0] gpif_ctl, output [3:0] gpif_rdy,
+ output [2:0] gpif_misc,
+
+ // Wishbone signals
+ input wb_clk, input wb_rst,
+ output [15:0] wb_adr_o, output [15:0] wb_dat_mosi, input [15:0] wb_dat_miso,
+ output [1:0] wb_sel_o, output wb_cyc_o, output wb_stb_o, output wb_we_o, input wb_ack_i,
+ input [7:0] triggers,
+
+ // FIFO interface
+ input fifo_clk, input fifo_rst, input clear_tx, input clear_rx,
+ output [35:0] tx_data_o, output tx_src_rdy_o, input tx_dst_rdy_i,
+ input [35:0] rx_data_i, input rx_src_rdy_i, output rx_dst_rdy_o,
+ input [35:0] tx_err_data_i, input tx_err_src_rdy_i, output tx_err_dst_rdy_o,
+
+ output tx_underrun, output rx_overrun,
+ input [7:0] frames_per_packet,
+ output [31:0] debug0, output [31:0] debug1
+ );
+
+ assign tx_underrun = 0;
+ assign rx_overrun = 0;
+
+ wire WR = gpif_ctl[0];
+ wire RD = gpif_ctl[1];
+ wire OE = gpif_ctl[2];
+ wire EP = gpif_ctl[3];
+
+ wire CF, CE, DF, DE;
+
+ assign gpif_rdy = { CF, CE, DF, DE };
+
+ wire [15:0] gpif_d_out;
+ assign gpif_d = OE ? gpif_d_out : 16'bz;
+
+ wire [15:0] gpif_d_copy = gpif_d;
+
+ wire [31:0] debug_rd, debug_wr, debug_split0, debug_split1;
+
+ // ////////////////////////////////////////////////////////////////////
+ // TX Data Path
+
+ wire [18:0] tx19_data;
+ wire tx19_src_rdy, tx19_dst_rdy;
+ wire [35:0] tx36_data;
+ wire tx36_src_rdy, tx36_dst_rdy;
+
+ wire [18:0] ctrl_data;
+ wire ctrl_src_rdy, ctrl_dst_rdy;
+
+ gpif_wr gpif_wr
+ (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst),
+ .gpif_data(gpif_d), .gpif_wr(WR), .gpif_ep(EP),
+ .gpif_full_d(DF), .gpif_full_c(CF),
+
+ .sys_clk(fifo_clk), .sys_rst(fifo_rst),
+ .data_o(tx19_data), .src_rdy_o(tx19_src_rdy), .dst_rdy_i(tx19_dst_rdy),
+ .ctrl_o(ctrl_data), .ctrl_src_rdy_o(ctrl_src_rdy), .ctrl_dst_rdy_i(ctrl_dst_rdy),
+ .debug(debug_wr) );
+
+ // join vita packets which are longer than one frame, drop frame padding
+ wire [18:0] refr_data;
+ wire refr_src_rdy, refr_dst_rdy;
+
+ packet_reframer tx_packet_reframer
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .data_i(tx19_data), .src_rdy_i(tx19_src_rdy), .dst_rdy_o(tx19_dst_rdy),
+ .data_o(refr_data), .src_rdy_o(refr_src_rdy), .dst_rdy_i(refr_dst_rdy));
+
+ fifo19_to_fifo36 #(.LE(1)) f19_to_f36
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
+ .f19_datain(refr_data), .f19_src_rdy_i(refr_src_rdy), .f19_dst_rdy_o(refr_dst_rdy),
+ .f36_dataout(tx36_data), .f36_src_rdy_o(tx36_src_rdy), .f36_dst_rdy_i(tx36_dst_rdy));
+
+ fifo_cascade #(.WIDTH(36), .SIZE(TXFIFOSIZE)) tx_fifo36
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .datain(tx36_data), .src_rdy_i(tx36_src_rdy), .dst_rdy_o(tx36_dst_rdy),
+ .dataout(tx_data_o), .src_rdy_o(tx_src_rdy_o), .dst_rdy_i(tx_dst_rdy_i));
+
+ // ////////////////////////////////////////////
+ // RX Data Path
+
+ wire [35:0] rx36_data;
+ wire rx36_src_rdy, rx36_dst_rdy;
+ wire [18:0] rx19_data, splt_data;
+ wire rx19_src_rdy, rx19_dst_rdy, splt_src_rdy, splt_dst_rdy;
+ wire [18:0] resp_data, resp_int1, resp_int2;
+ wire resp_src_rdy, resp_dst_rdy;
+ wire resp_src_rdy_int1, resp_dst_rdy_int1, resp_src_rdy_int2, resp_dst_rdy_int2;
+
+ fifo_cascade #(.WIDTH(36), .SIZE(RXFIFOSIZE)) rx_fifo36
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .datain(rx_data_i), .src_rdy_i(rx_src_rdy_i), .dst_rdy_o(rx_dst_rdy_o),
+ .dataout(rx36_data), .src_rdy_o(rx36_src_rdy), .dst_rdy_i(rx36_dst_rdy));
+
+ fifo36_to_fifo19 #(.LE(1)) f36_to_f19
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .f36_datain(rx36_data), .f36_src_rdy_i(rx36_src_rdy), .f36_dst_rdy_o(rx36_dst_rdy),
+ .f19_dataout(rx19_data), .f19_src_rdy_o(rx19_src_rdy), .f19_dst_rdy_i(rx19_dst_rdy) );
+
+ packet_splitter #(.FRAME_LEN(256)) packet_splitter
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .frames_per_packet(frames_per_packet),
+ .data_i(rx19_data), .src_rdy_i(rx19_src_rdy), .dst_rdy_o(rx19_dst_rdy),
+ .data_o(splt_data), .src_rdy_o(splt_src_rdy), .dst_rdy_i(splt_dst_rdy),
+ .debug0(debug_split0), .debug1(debug_split1));
+
+ gpif_rd gpif_rd
+ (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst),
+ .gpif_data(gpif_d_out), .gpif_rd(RD), .gpif_ep(EP),
+ .gpif_empty_d(DE), .gpif_empty_c(CE), .gpif_flush(gpif_misc[0]),
+
+ .sys_clk(fifo_clk), .sys_rst(fifo_rst),
+ .data_i(splt_data), .src_rdy_i(splt_src_rdy), .dst_rdy_o(splt_dst_rdy),
+ .resp_i(resp_data), .resp_src_rdy_i(resp_src_rdy), .resp_dst_rdy_o(resp_dst_rdy),
+ .debug(debug_rd) );
+
+ // ////////////////////////////////////////////////////////////////////
+ // FIFO to Wishbone interface
+
+ fifo_to_wb fifo_to_wb
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
+ .data_i(ctrl_data), .src_rdy_i(ctrl_src_rdy), .dst_rdy_o(ctrl_dst_rdy),
+ .data_o(resp_int1), .src_rdy_o(resp_src_rdy_int1), .dst_rdy_i(resp_dst_rdy_int1),
+ .wb_adr_o(wb_adr_o), .wb_dat_mosi(wb_dat_mosi), .wb_dat_miso(wb_dat_miso), .wb_sel_o(wb_sel_o),
+ .wb_cyc_o(wb_cyc_o), .wb_stb_o(wb_stb_o), .wb_we_o(wb_we_o), .wb_ack_i(wb_ack_i),
+ .triggers(triggers),
+ .debug0(), .debug1());
+
+ wire [18:0] tx_err19_data;
+ wire tx_err19_src_rdy, tx_err19_dst_rdy;
+
+ fifo36_to_fifo19 #(.LE(1)) f36_to_f19_txerr
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .f36_datain(tx_err_data_i), .f36_src_rdy_i(tx_err_src_rdy_i), .f36_dst_rdy_o(tx_err_dst_rdy_o),
+ .f19_dataout(tx_err19_data), .f19_src_rdy_o(tx_err19_src_rdy), .f19_dst_rdy_i(tx_err19_dst_rdy) );
+
+ fifo19_mux #(.prio(0)) mux_err_stream
+ (.clk(wb_clk), .reset(wb_rst), .clear(0),
+ .data0_i(resp_int1), .src0_rdy_i(resp_src_rdy_int1), .dst0_rdy_o(resp_dst_rdy_int1),
+ .data1_i(tx_err19_data), .src1_rdy_i(tx_err19_src_rdy), .dst1_rdy_o(tx_err19_dst_rdy),
+ .data_o(resp_int2), .src_rdy_o(resp_src_rdy_int2), .dst_rdy_i(resp_dst_rdy_int2));
+
+ fifo19_pad #(.LENGTH(16)) fifo19_pad
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
+ .data_i(resp_int2), .src_rdy_i(resp_src_rdy_int2), .dst_rdy_o(resp_dst_rdy_int2),
+ .data_o(resp_data), .src_rdy_o(resp_src_rdy), .dst_rdy_i(resp_dst_rdy));
+
+ // ////////////////////////////////////////////
+ // DEBUG
+
+ //assign debug0 = { rx19_src_rdy, rx19_dst_rdy, resp_src_rdy, resp_dst_rdy, gpif_ctl[3:0], gpif_rdy[3:0],
+ // gpif_d_copy[15:0] };
+
+ //assign debug1 = { { debug_rd[15:8] },
+ // { debug_rd[7:0] },
+ // { rx_src_rdy_i, rx_dst_rdy_o, rx36_src_rdy, rx36_dst_rdy, rx19_src_rdy, rx19_dst_rdy, resp_src_rdy, resp_dst_rdy},
+ // { tx_src_rdy_o, tx_dst_rdy_i, tx19_src_rdy, tx19_dst_rdy, tx36_src_rdy, tx36_dst_rdy, ctrl_src_rdy, ctrl_dst_rdy} };
+
+ assign debug0 = { gpif_ctl[3:0], gpif_rdy[3:0], debug_split0[23:0] };
+ assign debug1 = { gpif_misc[0], debug_rd[14:0], debug_split1[15:8], debug_split1[7:0] };
+endmodule // gpif
diff --git a/fpga/usrp2/gpif/gpif_rd.v b/fpga/usrp2/gpif/gpif_rd.v
new file mode 100644
index 000000000..b05c3cfb6
--- /dev/null
+++ b/fpga/usrp2/gpif/gpif_rd.v
@@ -0,0 +1,111 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+module gpif_rd
+ (input gpif_clk, input gpif_rst,
+ output [15:0] gpif_data, input gpif_rd, input gpif_ep,
+ output reg gpif_empty_d, output reg gpif_empty_c,
+ output reg gpif_flush,
+
+ input sys_clk, input sys_rst,
+ input [18:0] data_i, input src_rdy_i, output dst_rdy_o,
+ input [18:0] resp_i, input resp_src_rdy_i, output resp_dst_rdy_o,
+ output [31:0] debug
+ );
+
+ wire [18:0] data_o; // occ bit indicates flush
+ wire [17:0] resp_o; // no occ bit
+ wire final_rdy_data, final_rdy_resp;
+
+ // 33/257 Bug Fix
+ reg [8:0] read_count;
+ always @(negedge gpif_clk)
+ if(gpif_rst)
+ read_count <= 0;
+ else if(gpif_rd)
+ read_count <= read_count + 1;
+ else
+ read_count <= 0;
+
+ // Data Path
+ wire [18:0] data_int;
+ wire src_rdy_int, dst_rdy_int;
+ fifo_2clock_cascade #(.WIDTH(19), .SIZE(4)) rd_fifo_2clk
+ (.wclk(sys_clk), .datain(data_i[18:0]), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o), .space(),
+ .rclk(~gpif_clk), .dataout(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int), .occupied(),
+ .arst(sys_rst));
+
+ reg [7:0] packet_count;
+ wire consume_data_line = gpif_rd & ~gpif_ep & ~read_count[8];
+ wire produce_eop = src_rdy_int & dst_rdy_int & data_int[17];
+ wire consume_sop = consume_data_line & final_rdy_data & data_o[16];
+ wire consume_eop = consume_data_line & final_rdy_data & data_o[17];
+
+ fifo_cascade #(.WIDTH(19), .SIZE(10)) rd_fifo
+ (.clk(~gpif_clk), .reset(gpif_rst), .clear(0),
+ .datain(data_int), .src_rdy_i(src_rdy_int), .dst_rdy_o(dst_rdy_int), .space(),
+ .dataout(data_o), .src_rdy_o(final_rdy_data), .dst_rdy_i(consume_data_line), .occupied());
+
+ always @(negedge gpif_clk)
+ if(gpif_rst)
+ packet_count <= 0;
+ else
+ if(produce_eop & ~consume_sop)
+ packet_count <= packet_count + 1;
+ else if(consume_sop & ~produce_eop)
+ packet_count <= packet_count - 1;
+
+ always @(negedge gpif_clk)
+ if(gpif_rst)
+ gpif_empty_d <= 1;
+ else
+ gpif_empty_d <= ~|packet_count;
+
+ // Use occ bit to signal a gpif flush
+ always @(negedge gpif_clk)
+ if(gpif_rst)
+ gpif_flush <= 0;
+ else if(consume_eop & data_o[18])
+ gpif_flush <= ~gpif_flush;
+
+ // Response Path
+ wire [15:0] resp_fifolevel;
+ wire consume_resp_line = gpif_rd & gpif_ep & ~read_count[4];
+
+ fifo_2clock_cascade #(.WIDTH(18), .SIZE(4)) resp_fifo_2clk
+ (.wclk(sys_clk), .datain(resp_i[17:0]), .src_rdy_i(resp_src_rdy_i), .dst_rdy_o(resp_dst_rdy_o), .space(),
+ .rclk(~gpif_clk), .dataout(resp_o),
+ .src_rdy_o(final_rdy_resp), .dst_rdy_i(consume_resp_line), .occupied(resp_fifolevel),
+ .arst(sys_rst));
+
+ // FIXME -- handle short packets
+
+ always @(negedge gpif_clk)
+ if(gpif_rst)
+ gpif_empty_c <= 1;
+ else
+ gpif_empty_c <= resp_fifolevel < 16;
+
+ // Output Mux
+ assign gpif_data = gpif_ep ? resp_o[15:0] : data_o[15:0];
+
+ assign debug = { { 16'd0 },
+ { data_int[17:16], data_o[17:16], packet_count[3:0] },
+ { consume_sop, consume_eop, final_rdy_data, data_o[18], consume_data_line, consume_resp_line, src_rdy_int, dst_rdy_int} };
+
+endmodule // gpif_rd
diff --git a/fpga/usrp2/gpif/gpif_tb.v b/fpga/usrp2/gpif/gpif_tb.v
new file mode 100644
index 000000000..686284c2b
--- /dev/null
+++ b/fpga/usrp2/gpif/gpif_tb.v
@@ -0,0 +1,142 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+module gpif_tb();
+
+ reg sys_clk = 0;
+ reg sys_rst = 1;
+ reg gpif_clk = 0;
+ reg gpif_rst = 1;
+
+ reg [15:0] gpif_data;
+ reg WR = 0, EP = 0;
+
+ wire CF, DF;
+
+ wire gpif_full_d, gpif_full_c;
+ wire [18:0] data_o, ctrl_o, data_splt;
+ wire src_rdy, dst_rdy, src_rdy_splt, dst_rdy_splt;
+ wire ctrl_src_rdy, ctrl_dst_rdy;
+
+ assign ctrl_dst_rdy = 1;
+
+ initial $dumpfile("gpif_tb.vcd");
+ initial $dumpvars(0,gpif_tb);
+
+ initial #1000 gpif_rst = 0;
+ initial #1000 sys_rst = 0;
+ always #64 gpif_clk <= ~gpif_clk;
+ always #47.9 sys_clk <= ~sys_clk;
+
+ wire [18:0] data_int;
+ wire src_rdy_int, dst_rdy_int;
+
+ assign dst_rdy_splt = 1;
+
+ gpif_wr gpif_write
+ (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst),
+ .gpif_data(gpif_data), .gpif_wr(WR), .gpif_ep(EP),
+ .gpif_full_d(DF), .gpif_full_c(CF),
+
+ .sys_clk(sys_clk), .sys_rst(sys_rst),
+ .data_o(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int),
+ .ctrl_o(ctrl_o), .ctrl_src_rdy_o(ctrl_src_rdy), .ctrl_dst_rdy_i(ctrl_dst_rdy) );
+
+ packet_reframer tx_packet_reframer
+ (.clk(sys_clk), .reset(sys_rst), .clear(0),
+ .data_i(data_int), .src_rdy_i(src_rdy_int), .dst_rdy_o(dst_rdy_int),
+ .data_o(data_o), .src_rdy_o(src_rdy), .dst_rdy_i(dst_rdy));
+
+ packet_splitter #(.FRAME_LEN(256)) rx_packet_splitter
+ (.clk(sys_clk), .reset(sys_rst), .clear(0),
+ .frames_per_packet(2),
+ .data_i(data_o), .src_rdy_i(src_rdy), .dst_rdy_o(dst_rdy),
+ .data_o(data_splt), .src_rdy_o(src_rdy_splt), .dst_rdy_i(dst_rdy_splt));
+
+ always @(posedge sys_clk)
+ if(ctrl_src_rdy & ctrl_dst_rdy)
+ $display("CTRL: %x",ctrl_o);
+
+ always @(posedge sys_clk)
+ if(src_rdy_splt & dst_rdy_splt)
+ begin
+ if(data_splt[16])
+ $display("<-------- DATA SOF--------->");
+ $display("DATA: %x",data_splt);
+ if(data_splt[17])
+ $display("<-------- DATA EOF--------->");
+ end
+
+ initial
+ begin
+ #10000;
+ repeat (1)
+ begin
+ @(posedge gpif_clk);
+
+ WR <= 1;
+ gpif_data <= 256; // Length
+ @(posedge gpif_clk);
+ gpif_data <= 16'h00;
+ @(posedge gpif_clk);
+ repeat(254)
+ begin
+ gpif_data <= gpif_data + 1;
+ @(posedge gpif_clk);
+ end
+ WR <= 0;
+
+ while(DF)
+ @(posedge gpif_clk);
+ repeat (16)
+ @(posedge gpif_clk);
+
+ WR <= 1;
+ repeat(256)
+ begin
+ gpif_data <= gpif_data - 1;
+ @(posedge gpif_clk);
+ end
+ WR <= 0;
+
+
+/*
+ while(DF)
+ @(posedge gpif_clk);
+
+ repeat (20)
+ @(posedge gpif_clk);
+ WR <= 1;
+ gpif_data <= 16'h5;
+ @(posedge gpif_clk);
+ gpif_data <= 16'h00;
+ @(posedge gpif_clk);
+ repeat(254)
+ begin
+ gpif_data <= gpif_data - 1;
+ @(posedge gpif_clk);
+ end
+ WR <= 0;
+ */
+ end
+ end // initial begin
+
+ initial #200000 $finish;
+
+
+endmodule // gpif_tb
diff --git a/fpga/usrp2/gpif/gpif_wr.v b/fpga/usrp2/gpif/gpif_wr.v
new file mode 100644
index 000000000..89fae282e
--- /dev/null
+++ b/fpga/usrp2/gpif/gpif_wr.v
@@ -0,0 +1,95 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+module gpif_wr
+ (input gpif_clk, input gpif_rst,
+ input [15:0] gpif_data, input gpif_wr, input gpif_ep,
+ output reg gpif_full_d, output reg gpif_full_c,
+
+ input sys_clk, input sys_rst,
+ output [18:0] data_o, output src_rdy_o, input dst_rdy_i,
+ output [18:0] ctrl_o, output ctrl_src_rdy_o, input ctrl_dst_rdy_i,
+ output [31:0] debug );
+
+ reg wr_reg, ep_reg;
+ reg [15:0] gpif_data_reg;
+
+ always @(posedge gpif_clk)
+ begin
+ ep_reg <= gpif_ep;
+ wr_reg <= gpif_wr;
+ gpif_data_reg <= gpif_data;
+ end
+
+ reg [9:0] write_count;
+
+ always @(posedge gpif_clk)
+ if(gpif_rst)
+ write_count <= 0;
+ else if(wr_reg)
+ write_count <= write_count + 1;
+ else
+ write_count <= 0;
+
+ reg sop;
+ wire eop = (write_count == 255);
+ wire eop_ctrl = (write_count == 15);
+
+ always @(posedge gpif_clk)
+ sop <= gpif_wr & ~wr_reg;
+
+ // Data Path
+ wire [15:0] fifo_space;
+ always @(posedge gpif_clk)
+ if(gpif_rst)
+ gpif_full_d <= 1;
+ else
+ gpif_full_d <= fifo_space < 256;
+
+ wire [17:0] data_int;
+ wire src_rdy_int, dst_rdy_int;
+
+ fifo_cascade #(.WIDTH(18), .SIZE(10)) wr_fifo
+ (.clk(gpif_clk), .reset(gpif_rst), .clear(0),
+ .datain({eop,sop,gpif_data_reg}), .src_rdy_i(~ep_reg & wr_reg & ~write_count[8]), .dst_rdy_o(), .space(fifo_space),
+ .dataout(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int), .occupied());
+
+ fifo_2clock_cascade #(.WIDTH(18), .SIZE(4)) wr_fifo_2clk
+ (.wclk(gpif_clk), .datain(data_int), .src_rdy_i(src_rdy_int), .dst_rdy_o(dst_rdy_int), .space(),
+ .rclk(sys_clk), .dataout(data_o[17:0]), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i), .occupied(),
+ .arst(sys_rst));
+ assign data_o[18] = 1'b0;
+
+ // Control Path
+ wire [15:0] ctrl_fifo_space;
+ always @(posedge gpif_clk)
+ if(gpif_rst)
+ gpif_full_c <= 1;
+ else
+ gpif_full_c <= ctrl_fifo_space < 16;
+
+ fifo_2clock_cascade #(.WIDTH(19), .SIZE(4)) ctrl_fifo_2clk
+ (.wclk(gpif_clk), .datain({1'b0,eop_ctrl,sop,gpif_data_reg}),
+ .src_rdy_i(ep_reg & wr_reg & ~write_count[4]), .dst_rdy_o(), .space(ctrl_fifo_space),
+ .rclk(sys_clk), .dataout(ctrl_o[18:0]),
+ .src_rdy_o(ctrl_src_rdy_o), .dst_rdy_i(ctrl_dst_rdy_i), .occupied(),
+ .arst(sys_rst));
+
+ assign debug = { 16'd0, ep_reg, wr_reg, eop, sop, (~ep_reg & wr_reg & ~write_count[8]), src_rdy_int, dst_rdy_int, write_count[8:0]};
+
+endmodule // gpif_wr
diff --git a/fpga/usrp2/gpif/gpif_wr_tb.v b/fpga/usrp2/gpif/gpif_wr_tb.v
new file mode 100644
index 000000000..171bb96a1
--- /dev/null
+++ b/fpga/usrp2/gpif/gpif_wr_tb.v
@@ -0,0 +1,110 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+module gpif_wr_tb();
+
+ reg sys_clk = 0;
+ reg sys_rst = 1;
+ reg gpif_clk = 0;
+ reg gpif_rst = 1;
+
+ reg [15:0] gpif_data;
+ reg WR = 0, EP = 0;
+
+ wire CF, DF;
+
+ wire gpif_full_d, gpif_full_c;
+ wire [18:0] data_o, ctrl_o;
+ wire src_rdy, dst_rdy;
+ wire ctrl_src_rdy, ctrl_dst_rdy;
+
+ assign ctrl_dst_rdy = 1;
+ assign dst_rdy = 1;
+
+ initial $dumpfile("gpif_wr_tb.vcd");
+ initial $dumpvars(0,gpif_wr_tb);
+
+ initial #1000 gpif_rst = 0;
+ initial #1000 sys_rst = 0;
+ always #64 gpif_clk <= ~gpif_clk;
+ always #47.9 sys_clk <= ~sys_clk;
+
+ wire [18:0] data_int;
+ wire src_rdy_int, dst_rdy_int;
+
+ gpif_wr gpif_write
+ (.gpif_clk(gpif_clk), .gpif_rst(gpif_rst),
+ .gpif_data(gpif_data), .gpif_wr(WR), .gpif_ep(EP),
+ .gpif_full_d(DF), .gpif_full_c(CF),
+
+ .sys_clk(sys_clk), .sys_rst(sys_rst),
+ .data_o(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int),
+ .ctrl_o(ctrl_o), .ctrl_src_rdy_o(ctrl_src_rdy), .ctrl_dst_rdy_i(ctrl_dst_rdy) );
+
+ packet_reframer tx_packet_reframer
+ (.clk(sys_clk), .reset(sys_rst), .clear(0),
+ .data_i(data_int), .src_rdy_i(src_rdy_int), .dst_rdy_o(dst_rdy_int),
+ .data_o(data_o), .src_rdy_o(src_rdy), .dst_rdy_i(dst_rdy));
+
+ always @(posedge sys_clk)
+ if(ctrl_src_rdy & ctrl_dst_rdy)
+ $display("CTRL: %x",ctrl_o);
+
+ always @(posedge sys_clk)
+ if(src_rdy & dst_rdy)
+ begin
+ if(data_o[16])
+ $display("<-------- DATA SOF--------->");
+ $display("DATA: %x",data_o);
+ if(data_o[17])
+ $display("<-------- DATA EOF--------->");
+ end
+
+ initial
+ begin
+ #10000;
+ repeat (1)
+ begin
+ WR <= 1;
+ gpif_data <= 10; // Length
+ @(posedge gpif_clk);
+ gpif_data <= 16'h00;
+ @(posedge gpif_clk);
+ repeat(254)
+ begin
+ gpif_data <= gpif_data + 1;
+ @(posedge gpif_clk);
+ end
+ WR <= 0;
+ repeat (20)
+ @(posedge gpif_clk);
+ WR <= 1;
+ gpif_data <= 16'h5;
+ @(posedge gpif_clk);
+ repeat(254)
+ begin
+ gpif_data <= gpif_data - 1;
+ @(posedge gpif_clk);
+ end
+ end
+ end // initial begin
+
+ initial #100000 $finish;
+
+
+endmodule // gpif_wr_tb
diff --git a/fpga/usrp2/gpif/lint b/fpga/usrp2/gpif/lint
new file mode 100755
index 000000000..4316c89a9
--- /dev/null
+++ b/fpga/usrp2/gpif/lint
@@ -0,0 +1,2 @@
+iverilog -Wall -y . -y ../fifo/ -y ../control_lib/ -y ../models/ -y ../coregen/ -y ../simple_gemac/ -y ../sdr_lib/ -y ../vrt/ gpif.v 2>&1 | grep -v coregen | grep -v models
+
diff --git a/fpga/usrp2/gpif/packet_reframer.v b/fpga/usrp2/gpif/packet_reframer.v
new file mode 100644
index 000000000..e0ce9e174
--- /dev/null
+++ b/fpga/usrp2/gpif/packet_reframer.v
@@ -0,0 +1,70 @@
+//
+// Copyright 2011-2012 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+// Join vita packets longer than one GPIF frame
+
+module packet_reframer
+ (input clk, input reset, input clear,
+ input [15:0] data_i,
+ input src_rdy_i,
+ output dst_rdy_o,
+ output [18:0] data_o,
+ output src_rdy_o,
+ input dst_rdy_i,
+ output reg state,
+ output eof_out,
+ output reg [15:0] length);
+
+ //reg state;
+ //reg [15:0] length;
+
+ localparam RF_IDLE = 0;
+ localparam RF_PKT = 1;
+
+ always @(posedge clk)
+ if(reset | clear)
+ state <= RF_IDLE;
+ else
+ if(src_rdy_i & dst_rdy_i)
+ case(state)
+ RF_IDLE :
+ begin
+ length <= {data_i[14:0],1'b0};
+ state <= RF_PKT;
+ end
+ RF_PKT :
+ begin
+ if(eof_out) state <= RF_IDLE;
+ length <= length - 1;
+ end
+ endcase // case (state)
+
+ assign dst_rdy_o = dst_rdy_i; // this is a little pessimistic but ok
+ assign src_rdy_o = src_rdy_i;
+
+ wire occ_out = 0;
+ assign eof_out = (state == RF_PKT) & (length == 2);
+ wire sof_out = (state == RF_IDLE);
+ assign data_o = {occ_out, eof_out, sof_out, data_i[15:0]};
+
+
+endmodule // packet_reframer
+
+
+
+
diff --git a/fpga/usrp2/gpif/packet_splitter.v b/fpga/usrp2/gpif/packet_splitter.v
new file mode 100644
index 000000000..ba4c8cded
--- /dev/null
+++ b/fpga/usrp2/gpif/packet_splitter.v
@@ -0,0 +1,123 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+// Split vita packets longer than one GPIF frame, add padding on short frames
+
+module packet_splitter
+ #(parameter FRAME_LEN=256)
+ (input clk, input reset, input clear,
+ input [7:0] frames_per_packet,
+ input [18:0] data_i,
+ input src_rdy_i,
+ output dst_rdy_o,
+ output [18:0] data_o,
+ output src_rdy_o,
+ input dst_rdy_i,
+ output [31:0] debug0,
+ output [31:0] debug1);
+
+ reg [1:0] state;
+ reg [15:0] length;
+ reg [15:0] frame_len;
+ reg [7:0] frame_count;
+
+ localparam PS_IDLE = 0;
+ localparam PS_FRAME = 1;
+ localparam PS_NEW_FRAME = 2;
+ localparam PS_PAD = 3;
+
+ wire eof_i = data_i[17];
+
+ always @(posedge clk)
+ if(reset | clear)
+ begin
+ state <= PS_IDLE;
+ frame_count <= 0;
+ end
+ else
+ case(state)
+ PS_IDLE :
+ if(src_rdy_i & dst_rdy_i)
+ begin
+ length <= { data_i[14:0],1'b0};
+ frame_len <= FRAME_LEN;
+ state <= PS_FRAME;
+ frame_count <= 1;
+ end
+ PS_FRAME :
+ if(src_rdy_i & dst_rdy_i)
+ if((frame_len == 2) & ((length == 2) | eof_i))
+ state <= PS_IDLE;
+ else if(frame_len == 2)
+ begin
+ length <= length - 1;
+ state <= PS_NEW_FRAME;
+ frame_count <= frame_count + 1;
+ end
+ else if((length == 2)|eof_i)
+ begin
+ frame_len <= frame_len - 1;
+ state <= PS_PAD;
+ end
+ else
+ begin
+ frame_len <= frame_len - 1;
+ length <= length - 1;
+ end
+ PS_NEW_FRAME :
+ if(src_rdy_i & dst_rdy_i)
+ begin
+ frame_len <= FRAME_LEN;
+ if((length == 2)|eof_i)
+ state <= PS_PAD;
+ else
+ begin
+ state <= PS_FRAME;
+ length <= length - 1;
+ end // else: !if((length == 2)|eof_i)
+ end // if (src_rdy_i & dst_rdy_i)
+
+ PS_PAD :
+ if(dst_rdy_i)
+ if(frame_len == 2)
+ state <= PS_IDLE;
+ else
+ frame_len <= frame_len - 1;
+
+ endcase // case (state)
+
+ wire next_state_is_idle = dst_rdy_i & (frame_len==2) &
+ ( (state==PS_PAD) | ( (state==PS_FRAME) & src_rdy_i & ((length==2)|eof_i) ) );
+
+
+
+
+ assign dst_rdy_o = dst_rdy_i & (state != PS_PAD);
+ assign src_rdy_o = src_rdy_i | (state == PS_PAD);
+
+ wire eof_out = (frame_len == 2) & (state != PS_IDLE) & (state != PS_NEW_FRAME);
+ wire sof_out = (state == PS_IDLE) | (state == PS_NEW_FRAME);
+ wire occ_out = eof_out & next_state_is_idle & (frames_per_packet != frame_count);
+
+ wire [15:0] data_out = data_i[15:0];
+ assign data_o = {occ_out, eof_out, sof_out, data_out};
+
+ assign debug0 = { 8'd0, dst_rdy_o, src_rdy_o, next_state_is_idle, eof_out, sof_out, occ_out, state[1:0], frame_count[7:0], frames_per_packet[7:0] };
+ assign debug1 = { length[15:0], frame_len[15:0] };
+
+endmodule // packet_splitter
diff --git a/fpga/usrp2/gpif/packet_splitter_tb.v b/fpga/usrp2/gpif/packet_splitter_tb.v
new file mode 100644
index 000000000..329b58e0d
--- /dev/null
+++ b/fpga/usrp2/gpif/packet_splitter_tb.v
@@ -0,0 +1,137 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+module packet_splitter_tb();
+
+ reg sys_clk = 0;
+ reg sys_rst = 1;
+ reg gpif_clk = 0;
+ reg gpif_rst = 1;
+
+ reg [15:0] gpif_data;
+ reg WR = 0, EP = 0;
+
+ wire CF, DF;
+
+ wire gpif_full_d, gpif_full_c;
+ wire [18:0] data_o, ctrl_o, data_splt;
+ wire src_rdy, dst_rdy, src_rdy_splt, dst_rdy_splt;
+ wire ctrl_src_rdy, ctrl_dst_rdy;
+
+ assign ctrl_dst_rdy = 1;
+
+ initial $dumpfile("packet_splitter_tb.vcd");
+ initial $dumpvars(0,packet_splitter_tb);
+
+ initial #1000 gpif_rst = 0;
+ initial #1000 sys_rst = 0;
+ always #64 gpif_clk <= ~gpif_clk;
+ always #47.9 sys_clk <= ~sys_clk;
+
+ wire [35:0] data_int;
+ wire src_rdy_int, dst_rdy_int;
+
+ assign dst_rdy_splt = 1;
+
+ vita_pkt_gen vita_pkt_gen
+ (.clk(sys_clk), .reset(sys_rst) , .clear(0),
+ .len(512),.data_o(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int));
+
+ fifo36_to_fifo19 #(.LE(1)) f36_to_f19
+ (.clk(sys_clk), .reset(sys_rst), .clear(0),
+ .f36_datain(data_int), .f36_src_rdy_i(src_rdy_int), .f36_dst_rdy_o(dst_rdy_int),
+ .f19_dataout(data_o), .f19_src_rdy_o(src_rdy), .f19_dst_rdy_i(dst_rdy));
+
+ packet_splitter #(.FRAME_LEN(13)) rx_packet_splitter
+ (.clk(sys_clk), .reset(sys_rst), .clear(0),
+ .frames_per_packet(4),
+ .data_i(data_o), .src_rdy_i(src_rdy), .dst_rdy_o(dst_rdy),
+ .data_o(data_splt), .src_rdy_o(src_rdy_splt), .dst_rdy_i(dst_rdy_splt));
+
+ always @(posedge sys_clk)
+ if(ctrl_src_rdy & ctrl_dst_rdy)
+ $display("CTRL: %x",ctrl_o);
+
+ always @(posedge sys_clk)
+ if(src_rdy_splt & dst_rdy_splt)
+ begin
+ if(data_splt[16])
+ $display("<-------- DATA SOF--------->");
+ $display("DATA: %x",data_splt);
+ if(data_splt[17])
+ $display("<-------- DATA EOF--------->");
+ end
+
+ initial
+ begin
+ #10000;
+ repeat (1)
+ begin
+ @(posedge gpif_clk);
+
+ WR <= 1;
+ gpif_data <= 256; // Length
+ @(posedge gpif_clk);
+ gpif_data <= 16'h00;
+ @(posedge gpif_clk);
+ repeat(254)
+ begin
+ gpif_data <= gpif_data + 1;
+ @(posedge gpif_clk);
+ end
+ WR <= 0;
+
+ while(DF)
+ @(posedge gpif_clk);
+ repeat (16)
+ @(posedge gpif_clk);
+
+ WR <= 1;
+ repeat(256)
+ begin
+ gpif_data <= gpif_data - 1;
+ @(posedge gpif_clk);
+ end
+ WR <= 0;
+
+
+/*
+ while(DF)
+ @(posedge gpif_clk);
+
+ repeat (20)
+ @(posedge gpif_clk);
+ WR <= 1;
+ gpif_data <= 16'h5;
+ @(posedge gpif_clk);
+ gpif_data <= 16'h00;
+ @(posedge gpif_clk);
+ repeat(254)
+ begin
+ gpif_data <= gpif_data - 1;
+ @(posedge gpif_clk);
+ end
+ WR <= 0;
+ */
+ end
+ end // initial begin
+
+ initial #200000 $finish;
+
+
+endmodule // packet_splitter_tb
diff --git a/fpga/usrp2/gpif/slave_fifo.v b/fpga/usrp2/gpif/slave_fifo.v
new file mode 100644
index 000000000..e75f28913
--- /dev/null
+++ b/fpga/usrp2/gpif/slave_fifo.v
@@ -0,0 +1,473 @@
+//
+// Copyright 2011-2012 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+
+//////////////////////////////////////////////////////////////////////////////////
+
+//this is a FIFO master interface for the FX2 in "slave fifo" mode.
+
+module slave_fifo
+ #(parameter TXFIFOSIZE = 12, parameter RXFIFOSIZE = 12)
+ (// GPIF signals
+ input gpif_clk, input gpif_rst,
+ inout [15:0] gpif_d,
+ input [3:0] gpif_ctl,
+ output sloe, output slrd, output slwr, output pktend, output [1:0] fifoadr,
+
+ // Wishbone signals
+ input wb_clk, input wb_rst,
+ output [15:0] wb_adr_o, output [15:0] wb_dat_mosi, input [15:0] wb_dat_miso,
+ output [1:0] wb_sel_o, output wb_cyc_o, output wb_stb_o, output wb_we_o, input wb_ack_i,
+ input [7:0] triggers,
+
+ input dsp_rx_run,
+
+ // FIFO interface
+ input fifo_clk, input fifo_rst, input clear_tx, input clear_rx,
+ output [35:0] tx_data_o, output tx_src_rdy_o, input tx_dst_rdy_i,
+ input [35:0] rx_data_i, input rx_src_rdy_i, output rx_dst_rdy_o,
+ input [35:0] tx_err_data_i, input tx_err_src_rdy_i, output tx_err_dst_rdy_o,
+ output tx_underrun, output rx_overrun,
+
+ input [15:0] test_len, input [7:0] test_rate, input [3:0] test_ctrl,
+ output [31:0] debug0, output [31:0] debug1
+ );
+
+ reg FX2_DE, FX2_CE, FX2_DF, FX2_CF;
+
+ // inputs to FPGA (all active low)
+ always @(posedge gpif_clk) begin
+ FX2_DE <= ~gpif_ctl[0]; //EP2 FX2 FIFO empty (FLAGA)
+ FX2_CE <= ~gpif_ctl[1]; //EP4 FX2 FIFO empty (FLAGB)
+ FX2_DF <= ~gpif_ctl[2]; //EP6 FX2 FIFO full (FLAGC)
+ FX2_CF <= ~gpif_ctl[3]; //EP8 FX2 FIFO full (FLAGD)
+ end
+
+ wire [17:0] gpif_d_out_ctrl, gpif_d_out_data, gpif_d_out;
+
+ // ////////////////////////////////////////////////////////////////////
+ // GPIF bus master state machine
+
+ //transfer size for GPIF data. this can be anything really, it's specified only for
+ //fairness in bus sharing. 256 lines is 512 bytes over the wire, half the size of
+ //the double buffers in B100/B150. this should probably be a toplevel parameter or even
+ //a settings register value.
+ localparam data_transfer_size = 256;
+ localparam ctrl_transfer_size = 16; //probably unnecessary since ctrl xfers won't back up
+
+ // state machine i/o to four fifos
+ //tx
+ wire ctrl_tx_dst_rdy; //sm input, ctrl tx path has space
+ wire ctrl_tx_src_rdy; //sm output, ctrl tx path enable
+ wire data_tx_dst_rdy; //sm input, data tx path has space
+ wire data_tx_src_rdy; //sm output, data tx path enable
+
+ //rx
+ wire ctrl_rx_dst_rdy; //sm output, ctrl rx path enable
+ wire ctrl_rx_src_rdy; //sm input, ctrl rx path has space
+ wire data_rx_dst_rdy; //sm output, data rx path enable
+ wire data_rx_src_rdy; //sm input, data rx path has space
+
+ reg tx_data_enough_space;
+
+ reg [9:0] transfer_count; //number of lines (a line is 16 bits) in active transfer
+
+ reg pktend_latch;
+
+ reg [3:0] state; //state machine current state
+ localparam STATE_IDLE = 0;
+ localparam STATE_DATA_RX = 5;
+ localparam STATE_DATA_TX = 3;
+ localparam STATE_CTRL_RX = 6;
+ localparam STATE_CTRL_TX = 9;
+ localparam STATE_DATA_TX_SLOE = 2;
+ localparam STATE_CTRL_TX_SLOE = 8;
+ localparam STATE_DATA_RX_ADR = 1;
+ localparam STATE_CTRL_RX_ADR = 4;
+ localparam STATE_PKTEND_ADR = 10;
+ localparam STATE_PKTEND = 7;
+
+ //logs the last bus user for xfer fairness
+ //we only care about data rx vs. tx since ctrl pkts are so short
+ reg last_data_bus_hog;
+ localparam BUS_HOG_RX = 0;
+ localparam BUS_HOG_TX = 1;
+
+ // //////////////////////////////////////////////////////////////
+ // FX2 slave FIFO bus master state machine
+ //
+ always @(posedge gpif_clk)
+ if(gpif_rst)
+ state <= STATE_IDLE;
+ else
+ begin
+ case (state)
+ STATE_IDLE:
+ begin
+ transfer_count <= 0;
+ //handle transitions to other states
+ if(ctrl_tx_dst_rdy & ~FX2_CE) //if there's room in the ctrl fifo and the FX2 has ctrl data
+ state <= STATE_CTRL_TX_SLOE;
+ else if(ctrl_rx_src_rdy & ~FX2_CF) //if the ctrl fifo has data and the FX2 isn't full
+ state <= STATE_CTRL_RX_ADR;
+ else if(data_tx_dst_rdy & ~FX2_DE & last_data_bus_hog == BUS_HOG_RX & tx_data_enough_space) //if there's room in the data fifo and the FX2 has data
+ state <= STATE_DATA_TX_SLOE;
+ else if(data_rx_src_rdy & ~FX2_DF & last_data_bus_hog == BUS_HOG_TX) //if the data fifo has data and the FX2 isn't full
+ state <= STATE_DATA_RX_ADR;
+ else if(data_tx_dst_rdy & ~FX2_DE & tx_data_enough_space)
+ state <= STATE_DATA_TX_SLOE;
+ else if(data_rx_src_rdy & ~FX2_DF)
+ state <= STATE_DATA_RX_ADR;
+ else if(~data_rx_src_rdy & ~dsp_rx_run & pktend_latch & ~FX2_DF)
+ state <= STATE_PKTEND_ADR;
+
+ if(data_rx_src_rdy)
+ pktend_latch <= 1;
+ end
+
+ STATE_DATA_TX_SLOE: //just to assert SLOE one cycle before SLRD
+ state <= STATE_DATA_TX;
+ STATE_CTRL_TX_SLOE:
+ state <= STATE_CTRL_TX;
+
+ STATE_DATA_RX_ADR: //just to assert FIFOADR one cycle before SLWR
+ state <= STATE_DATA_RX;
+ STATE_CTRL_RX_ADR:
+ state <= STATE_CTRL_RX;
+
+ STATE_DATA_RX:
+ begin
+ if(data_rx_src_rdy && data_rx_dst_rdy)
+ transfer_count <= transfer_count + 1;
+ else
+ state <= STATE_IDLE;
+ last_data_bus_hog <= BUS_HOG_RX;
+ end
+
+ STATE_PKTEND_ADR:
+ begin
+ state <= STATE_PKTEND;
+ end
+
+ STATE_PKTEND:
+ begin
+ state <= STATE_IDLE;
+ pktend_latch <= 0;
+ end
+
+ STATE_DATA_TX:
+ begin
+ if(data_tx_dst_rdy && data_tx_src_rdy)
+ transfer_count <= transfer_count + 1;
+ else
+ state <= STATE_IDLE;
+ last_data_bus_hog <= BUS_HOG_TX;
+ end
+ STATE_CTRL_RX:
+ begin
+ if(ctrl_rx_src_rdy && ctrl_rx_dst_rdy)
+ transfer_count <= transfer_count + 1;
+ else
+ state <= STATE_IDLE;
+ end
+ STATE_CTRL_TX:
+ begin
+ if(ctrl_tx_dst_rdy && ctrl_tx_src_rdy)
+ transfer_count <= transfer_count + 1;
+ else
+ state <= STATE_IDLE;
+ end
+ endcase
+ end
+
+ // ///////////////////////////////////////////////////////////////////
+ // fifo signal assignments and enables
+
+ //enable fifos
+ assign data_rx_dst_rdy = (state == STATE_DATA_RX) && ~FX2_DF && (transfer_count != data_transfer_size);
+ assign data_tx_src_rdy = (state == STATE_DATA_TX) && ~FX2_DE && (transfer_count != data_transfer_size);
+ assign ctrl_rx_dst_rdy = (state == STATE_CTRL_RX) && ~FX2_CF;
+ assign ctrl_tx_src_rdy = (state == STATE_CTRL_TX) && ~FX2_CE;
+
+ //framing for TX ctrl packets
+ wire sop_ctrl, eop_ctrl;
+ assign sop_ctrl = (transfer_count == 0);
+ assign eop_ctrl = (transfer_count == (ctrl_transfer_size-1));
+
+ // ////////////////////////////////////////////////////////////////////
+ // set GPIF pins
+
+ //set fifoadr to the appropriate endpoint
+ // {0,0}: EP2, data TX from host
+ // {0,1}: EP4, ctrl TX from host
+ // {1,0}: EP6, data RX to host
+ // {1,1}: EP8, ctrl RX to host
+ assign fifoadr = {(state == STATE_DATA_RX) | (state == STATE_CTRL_RX) | (state == STATE_DATA_RX_ADR) | (state == STATE_CTRL_RX_ADR) | (state == STATE_PKTEND) | (state == STATE_PKTEND_ADR),
+ (state == STATE_CTRL_RX) | (state == STATE_CTRL_RX_ADR) | (state == STATE_CTRL_TX) | (state == STATE_CTRL_TX_SLOE)};
+ //set sloe, slwr, slrd (all active low)
+ //SLOE gets asserted when we want data from the FX2; i.e., TX mode
+ assign sloe = ~{(state == STATE_DATA_TX) | (state == STATE_CTRL_TX) | (state == STATE_DATA_TX_SLOE) | (state == STATE_CTRL_TX_SLOE)};
+ //"read" and "write" here are from the master's point of view;
+ //so "read" means "transmit" and "write" means "receive"
+ assign slwr = ~{(data_rx_src_rdy && data_rx_dst_rdy) || (ctrl_rx_src_rdy && ctrl_rx_dst_rdy)};
+ assign slrd = ~{(data_tx_src_rdy && data_tx_dst_rdy) || (ctrl_tx_src_rdy && ctrl_tx_dst_rdy)};
+
+ wire pktend_ctrl, pktend_data;
+ assign pktend_ctrl = ((~ctrl_rx_src_rdy | gpif_d_out_ctrl[17]) & (state == STATE_CTRL_RX));
+ assign pktend_data = (state == STATE_PKTEND);
+ assign pktend = ~(pktend_ctrl | pktend_data);
+
+ //mux between ctrl/data RX data out based on endpoint selection
+ assign gpif_d_out = fifoadr[0] ? gpif_d_out_ctrl : gpif_d_out_data;
+ // GPIF output data lines, tristate
+ assign gpif_d = sloe ? gpif_d_out : 16'bz;
+
+ // ////////////////////////////////////////////////////////////////////
+ // TX Data Path
+
+ wire [15:0] txfifo_data;
+ wire txfifo_src_rdy, txfifo_dst_rdy;
+ wire [35:0] tx36_data;
+ wire tx36_src_rdy, tx36_dst_rdy;
+ wire [15:0] data_tx_2clk;
+ wire tx_src_rdy_2clk, tx_dst_rdy_2clk;
+
+ wire [15:0] wr_fifo_space;
+
+ always @(posedge gpif_clk)
+ tx_data_enough_space <= (wr_fifo_space >= data_transfer_size);
+
+ fifo_cascade #(.WIDTH(16), .SIZE(12)) wr_fifo
+ (.clk(gpif_clk), .reset(gpif_rst), .clear(clear_tx),
+ .datain(gpif_d), .src_rdy_i(data_tx_src_rdy), .dst_rdy_o(data_tx_dst_rdy), .space(wr_fifo_space),
+ .dataout(txfifo_data), .src_rdy_o(txfifo_src_rdy), .dst_rdy_i(txfifo_dst_rdy), .occupied());
+
+ fifo_2clock_cascade #(.WIDTH(16), .SIZE(4)) wr_fifo_2clk
+ (.wclk(gpif_clk), .datain(txfifo_data), .src_rdy_i(txfifo_src_rdy), .dst_rdy_o(txfifo_dst_rdy), .space(),
+ .rclk(fifo_clk), .dataout(data_tx_2clk), .src_rdy_o(tx_src_rdy_2clk), .dst_rdy_i(tx_dst_rdy_2clk), .occupied(),
+ .arst(fifo_rst));
+
+ // join vita packets which are longer than one frame, add SOP/EOP/OCC
+ wire [18:0] refr_data;
+ wire refr_src_rdy, refr_dst_rdy;
+ //below 3 signals for debug only
+ wire refr_state;
+ wire refr_eof;
+ wire [15:0] refr_len;
+
+ packet_reframer tx_packet_reframer
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .data_i(data_tx_2clk), .src_rdy_i(tx_src_rdy_2clk), .dst_rdy_o(tx_dst_rdy_2clk),
+ .data_o(refr_data), .src_rdy_o(refr_src_rdy), .dst_rdy_i(refr_dst_rdy),
+ .state(refr_state), .eof_out(refr_eof), .length(refr_len));
+
+ fifo19_to_fifo36 #(.LE(1)) f19_to_f36
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .f19_datain(refr_data), .f19_src_rdy_i(refr_src_rdy), .f19_dst_rdy_o(refr_dst_rdy),
+ .f36_dataout(tx36_data), .f36_src_rdy_o(tx36_src_rdy), .f36_dst_rdy_i(tx36_dst_rdy));
+
+ fifo_cascade #(.WIDTH(36), .SIZE(TXFIFOSIZE)) tx_fifo36
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .datain(tx36_data), .src_rdy_i(tx36_src_rdy), .dst_rdy_o(tx36_dst_rdy),
+ .dataout(tx_data_o), .src_rdy_o(tx_src_rdy_o), .dst_rdy_i(tx_dst_rdy_i));
+
+ // ////////////////////////////////////////////
+ // RX Data Path
+
+ wire [35:0] rx36_data;
+ wire rx36_src_rdy, rx36_dst_rdy;
+ wire [18:0] rx19_data;
+ wire rx19_src_rdy, rx19_dst_rdy;
+ wire [15:0] rxfifospace;
+
+ //deep 36 bit wide input fifo buffers from DSP
+ fifo_cascade #(.WIDTH(36), .SIZE(8)) rx_fifo36
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .datain(rx_data_i), .src_rdy_i(rx_src_rdy_i), .dst_rdy_o(rx_dst_rdy_o),
+ .dataout(rx36_data), .src_rdy_o(rx36_src_rdy), .dst_rdy_i(rx36_dst_rdy));
+
+ //convert to fifo19
+ fifo36_to_fifo19 #(.LE(1)) f36_to_f19
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .f36_datain(rx36_data), .f36_src_rdy_i(rx36_src_rdy), .f36_dst_rdy_o(rx36_dst_rdy),
+ .f19_dataout(rx19_data), .f19_src_rdy_o(rx19_src_rdy), .f19_dst_rdy_i(rx19_dst_rdy) );
+
+ wire [18:0] data_rx_int;
+ wire rx_src_rdy_int, rx_dst_rdy_int;
+ //clock domain crossing fifo for RX data
+ fifo_2clock_cascade #(.WIDTH(19), .SIZE(4)) rd_fifo_2clk
+ (.wclk(fifo_clk), .datain(rx19_data), .src_rdy_i(rx19_src_rdy), .dst_rdy_o(rx19_dst_rdy), .space(),
+ .rclk(~gpif_clk), .dataout(data_rx_int), .src_rdy_o(rx_src_rdy_int), .dst_rdy_i(rx_dst_rdy_int), .occupied(),
+ .arst(fifo_rst));
+
+ //rd_fifo buffers writes to the 2clock fifo above
+ fifo_cascade #(.WIDTH(16), .SIZE(RXFIFOSIZE)) rd_fifo
+ (.clk(~gpif_clk), .reset(gpif_rst), .clear(clear_rx),
+ .datain(data_rx_int), .src_rdy_i(rx_src_rdy_int), .dst_rdy_o(rx_dst_rdy_int), .space(rxfifospace),
+ .dataout(gpif_d_out_data), .src_rdy_o(data_rx_src_rdy), .dst_rdy_i(data_rx_dst_rdy), .occupied());
+
+ // ////////////////////////////////////////////////////////////////////
+ // FIFO to Wishbone interface
+
+ wire [18:0] resp_data, resp_int;
+ wire resp_src_rdy, resp_dst_rdy;
+ wire resp_src_rdy_int, resp_dst_rdy_int;
+
+ wire [18:0] tx_err19_data;
+ wire tx_err19_src_rdy, tx_err19_dst_rdy;
+
+ wire [18:0] ctrl_data;
+ wire ctrl_src_rdy, ctrl_dst_rdy;
+
+ fifo_to_wb fifo_to_wb
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(0),
+ .data_i(ctrl_data), .src_rdy_i(ctrl_src_rdy), .dst_rdy_o(ctrl_dst_rdy),
+ .data_o(resp_int), .src_rdy_o(resp_src_rdy_int), .dst_rdy_i(resp_dst_rdy_int),
+ .wb_adr_o(wb_adr_o), .wb_dat_mosi(wb_dat_mosi), .wb_dat_miso(wb_dat_miso), .wb_sel_o(wb_sel_o),
+ .wb_cyc_o(wb_cyc_o), .wb_stb_o(wb_stb_o), .wb_we_o(wb_we_o), .wb_ack_i(wb_ack_i),
+ .triggers(triggers),
+ .debug0(), .debug1());
+
+ // ////////////////////////////////////////////////////////////////////
+ // TX CTRL PATH (ctrl commands into Wishbone)
+
+ //how does this use fifo_clk instead of wb_clk
+ //answer: on b100 fifo clk IS wb clk
+ fifo_2clock_cascade #(.WIDTH(19), .SIZE(4)) ctrl_fifo_2clk
+ (.wclk(gpif_clk), .datain({1'b0,eop_ctrl,sop_ctrl,gpif_d}),
+ .src_rdy_i(ctrl_tx_src_rdy), .dst_rdy_o(ctrl_tx_dst_rdy), .space(),
+ .rclk(fifo_clk), .dataout(ctrl_data),
+ .src_rdy_o(ctrl_src_rdy), .dst_rdy_i(ctrl_dst_rdy), .occupied(),
+ .arst(fifo_rst));
+
+ // ////////////////////////////////////////////////////////////////////
+ // RX CTRL PATH (async packets, ctrl response data)
+
+ //tx_err_data_i is the 36wide tx async err data clocked on fifo_clk
+ fifo36_to_fifo19 #(.LE(1)) f36_to_f19_txerr
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .f36_datain(tx_err_data_i), .f36_src_rdy_i(tx_err_src_rdy_i), .f36_dst_rdy_o(tx_err_dst_rdy_o),
+ .f19_dataout(tx_err19_data), .f19_src_rdy_o(tx_err19_src_rdy), .f19_dst_rdy_i(tx_err19_dst_rdy) );
+
+ //mux FIFO-to-WB along with async tx err pkts into one ctrl resp fifo
+ //how is this clocked on wb_clk?
+ fifo19_mux #(.prio(0)) mux_err_stream
+ (.clk(wb_clk), .reset(wb_rst), .clear(clear_rx),
+ .data0_i(resp_int), .src0_rdy_i(resp_src_rdy_int), .dst0_rdy_o(resp_dst_rdy_int),
+ .data1_i(tx_err19_data), .src1_rdy_i(tx_err19_src_rdy), .dst1_rdy_o(tx_err19_dst_rdy),
+ .data_o(resp_data), .src_rdy_o(resp_src_rdy), .dst_rdy_i(resp_dst_rdy));
+
+ //clock domain crossing cascade fifo for mux_err_stream to get from wb_clk to gpif_clk
+ //the output of this fifo is CTRL DATA PENDING FOR GPIF
+ fifo_2clock_cascade #(.WIDTH(18), .SIZE(4)) resp_fifo_2clk
+ (.wclk(wb_clk), .datain(resp_data[17:0]), .src_rdy_i(resp_src_rdy), .dst_rdy_o(resp_dst_rdy), .space(),
+ .rclk(~gpif_clk), .dataout(gpif_d_out_ctrl),
+ .src_rdy_o(ctrl_rx_src_rdy), .dst_rdy_i(ctrl_rx_dst_rdy), .occupied(),
+ .arst(wb_rst));
+
+
+ // ////////////////////////////////////////////////////////////////////
+ // Debug support, timed and loopback
+ // RX side muxes test data into the same stream
+
+ ///////////////////////////////////////////////////////////////////////
+ // debug lines
+ wire [31:0] debug_rd, debug_wr, debug_split0, debug_split1;
+
+ wire [35:0] timedrx_data, loopbackrx_data, testrx_data;
+ wire [35:0] timedtx_data, loopbacktx_data, testtx_data;
+ wire timedrx_src_rdy, timedrx_dst_rdy, loopbackrx_src_rdy, loopbackrx_dst_rdy,
+ testrx_src_rdy, testrx_dst_rdy;
+ wire timedtx_src_rdy, timedtx_dst_rdy, loopbacktx_src_rdy, loopbacktx_dst_rdy,
+ testtx_src_rdy, testtx_dst_rdy;
+ wire timedrx_src_rdy_int, timedrx_dst_rdy_int, timedtx_src_rdy_int, timedtx_dst_rdy_int;
+
+ wire [31:0] total, crc_err, seq_err, len_err;
+ wire sel_testtx = test_ctrl[0];
+ wire sel_loopbacktx = test_ctrl[1];
+ wire pkt_src_enable = test_ctrl[2];
+ wire pkt_sink_enable = test_ctrl[3];
+/*
+ fifo36_mux rx_test_mux_lvl_1
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .data0_i(timedrx_data), .src0_rdy_i(timedrx_src_rdy), .dst0_rdy_o(timedrx_dst_rdy),
+ .data1_i(loopbackrx_data), .src1_rdy_i(loopbackrx_src_rdy), .dst1_rdy_o(loopbackrx_dst_rdy),
+ .data_o(testrx_data), .src_rdy_o(testrx_src_rdy), .dst_rdy_i(testrx_dst_rdy));
+
+ fifo36_mux rx_test_mux_lvl_2
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .data0_i(testrx_data), .src0_rdy_i(testrx_src_rdy), .dst0_rdy_o(testrx_dst_rdy),
+ .data1_i(rx_data_i), .src1_rdy_i(rx_src_rdy_i), .dst1_rdy_o(rx_dst_rdy_o),
+ .data_o(rx_data), .src_rdy_o(rx_src_rdy), .dst_rdy_i(rx_dst_rdy));
+
+ fifo_short #(.WIDTH(36)) loopback_fifo
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx | clear_rx),
+ .datain(loopbacktx_data), .src_rdy_i(loopbacktx_src_rdy), .dst_rdy_o(loopbacktx_dst_rdy),
+ .dataout(loopbackrx_data), .src_rdy_o(loopbackrx_src_rdy), .dst_rdy_i(loopbackrx_dst_rdy));
+
+ // Crossbar used as a demux for switching TX stream to main DSP or to test logic
+ crossbar36 tx_crossbar_lvl_1
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .cross(sel_testtx),
+ .data0_i(tx_data), .src0_rdy_i(tx_src_rdy), .dst0_rdy_o(tx_dst_rdy),
+ .data1_i(tx_data), .src1_rdy_i(1'b0), .dst1_rdy_o(), // No 2nd input
+ .data0_o(tx_data_o), .src0_rdy_o(tx_src_rdy_o), .dst0_rdy_i(tx_dst_rdy_i),
+ .data1_o(testtx_data), .src1_rdy_o(testtx_src_rdy), .dst1_rdy_i(testtx_dst_rdy) );
+
+ crossbar36 tx_crossbar_lvl_2
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .cross(sel_loopbacktx),
+ .data0_i(testtx_data), .src0_rdy_i(testtx_src_rdy), .dst0_rdy_o(testtx_dst_rdy),
+ .data1_i(testtx_data), .src1_rdy_i(1'b0), .dst1_rdy_o(), // No 2nd input
+ .data0_o(timedtx_data), .src0_rdy_o(timedtx_src_rdy), .dst0_rdy_i(timedtx_dst_rdy),
+ .data1_o(loopbacktx_data), .src1_rdy_o(loopbacktx_src_rdy), .dst1_rdy_i(loopbacktx_dst_rdy) );
+
+ // Fixed rate TX traffic consumer
+ fifo_pacer tx_pacer
+ (.clk(fifo_clk), .reset(fifo_rst), .rate(test_rate), .enable(pkt_sink_enable),
+ .src1_rdy_i(timedtx_src_rdy), .dst1_rdy_o(timedtx_dst_rdy),
+ .src2_rdy_o(timedtx_src_rdy_int), .dst2_rdy_i(timedtx_dst_rdy_int),
+ .underrun(tx_underrun), .overrun());
+
+ packet_verifier32 pktver32
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
+ .data_i(timedtx_data), .src_rdy_i(timedtx_src_rdy_int), .dst_rdy_o(timedtx_dst_rdy_int),
+ .total(total), .crc_err(crc_err), .seq_err(seq_err), .len_err(len_err));
+
+ // Fixed rate RX traffic generator
+ vita_pkt_gen pktgen
+ (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_rx),
+ .len(test_len),
+ .data_o(timedrx_data), .src_rdy_o(timedrx_src_rdy_int), .dst_rdy_i(timedrx_dst_rdy_int));
+
+ fifo_pacer rx_pacer
+ (.clk(fifo_clk), .reset(fifo_rst), .rate(test_rate), .enable(pkt_src_enable),
+ .src1_rdy_i(timedrx_src_rdy_int), .dst1_rdy_o(timedrx_dst_rdy_int),
+ .src2_rdy_o(timedrx_src_rdy), .dst2_rdy_i(timedrx_dst_rdy),
+ .underrun(), .overrun(rx_overrun));
+*/
+ // ////////////////////////////////////////////
+ // DEBUG
+
+ assign debug0 = { pktend_latch, data_rx_src_rdy, gpif_ctl[3:0], sloe, slrd, slwr, pktend, fifoadr[1:0], state[3:0], gpif_d[15:0]};
+ //assign debug0 = { data_tx_src_rdy, data_tx_dst_rdy, tx_src_rdy_int, tx_dst_rdy_int,
+ // tx19_src_rdy, tx19_dst_rdy, refr_src_rdy, refr_dst_rdy,
+ // tx36_src_rdy, tx36_dst_rdy,
+ // gpif_ctl[3:0], fifoadr[1:0],
+ // wr_fifo_space[15:0]};
+ assign debug1 = { 16'b0, transfer_count[7:0], ctrl_rx_src_rdy, ctrl_tx_dst_rdy, data_rx_src_rdy,
+ data_tx_dst_rdy, ctrl_tx_src_rdy, ctrl_rx_dst_rdy, data_tx_src_rdy, data_rx_dst_rdy};
+endmodule // slave_fifo
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 23:02:35 +0000