fpga: core: Add chdr_update_length function

Original-commit: 8c6eabcd86f8e5d1e25cfed441e1acf1a0b6759a
2020-04-14 16:37:43 -05:00
parent b566c415a1
commit c9c9543719
1 changed files with 21 additions and 0 deletions
@@ -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