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fpga: core: Add chdr_update_length function

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Original-commit: 8c6eabcd86f8e5d1e25cfed441e1acf1a0b6759a
This commit is contained in:
Wade Fife
2020-04-14 16:37:43 -05:00
parent b566c415a1
commit c9c9543719
1 changed files with 21 additions and 0 deletions
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lib/rfnoc/core/rfnoc_chdr_utils.vh
+21
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@@ -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