diff options
Diffstat (limited to 'fpga/usrp3/lib')
| -rw-r--r-- | fpga/usrp3/lib/rfnoc/core/rfnoc_chdr_utils.vh | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fpga/usrp3/lib/rfnoc/core/rfnoc_chdr_utils.vh b/fpga/usrp3/lib/rfnoc/core/rfnoc_chdr_utils.vh index 047d58bc0..32376d12d 100644 --- a/fpga/usrp3/lib/rfnoc/core/rfnoc_chdr_utils.vh +++ b/fpga/usrp3/lib/rfnoc/core/rfnoc_chdr_utils.vh @@ -198,3 +198,24 @@ function [15:0] chdr_calc_payload_length(input [31:0] chdr_w, input [63:0] heade chdr_calc_payload_length = payload_length; end endfunction + +// Return a CHDR header with the length field updated, based on the CHDR_W, +// payload byte length, and current header fields. +function [63:0] chdr_update_length( + input [31:0] chdr_w, + input [63:0] base_hdr, + input [15:0] payload_length +); + reg [15:0] length, mdata_length, header_length; + begin + if (chdr_w == 64) begin + header_length = chdr_get_has_time(base_hdr) ? 2*(chdr_w/8) : (chdr_w/8); + end else begin + header_length = chdr_w/8; + end + mdata_length = chdr_get_num_mdata(base_hdr) * (chdr_w/8); + length = header_length + mdata_length + payload_length; + + chdr_update_length = chdr_set_length(chdr_w, length); + end +endfunction |