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tri_mode_mac CRC

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tri_mode_mac CRC by rsabhilash on Aug 5, 2010			rsabhilash Posts: 4 Joined: May 5, 2010 Last seen: Mar 14, 2020
Hai all , I am trying to implement tri mode mac. When I go through the tx engine I met with CRC_gen module What is the purpose of appending 8'hff to the CRC_reg. CRC_reg <={CRC_reg[23:0],8'hff}; Thanks in advance Hai all , I am trying to implement tri mode mac. When I go through the tx engine I met with CRC_gen module What is the purpose of appending 8'hff to the CRC_reg. CRC_reg Thanks in advance

RE: tri_mode_mac CRC by ghutchis on Aug 5, 2010			ghutchis Posts: 15 Joined: Apr 21, 2004 Last seen: Mar 23, 2026
Typically CRC generators are initialized to all 1s prior to calculating the CRC; designer may be initializing over 4 cycles. <p> Example CRC generator:<p> <pre> always @* begin nxt_icrc[7:0] = icrc[7:0] ^ data; nxt_icrc[31:8] = icrc[31:8]; for (i=0; i<8; i=i+1) begin if (nxt_icrc[0]) nxt_icrc = nxt_icrc[31:1] ^ 32'hEDB88320; else nxt_icrc = nxt_icrc[31:1]; end end // always @ * always @(posedge clk) begin if (clear) icrc <= #1 {32{1'b1}}; else if (valid) icrc <= nxt_icrc; end </pre> Typically CRC generators are initialized to all 1s prior to calculating the CRC; designer may be initializing over 4 cycles. Example CRC generator: always @* begin nxt_icrc[7:0] = icrc[7:0] ^ data; nxt_icrc[31:8] = icrc[31:8]; for (i=0; i

RE: tri_mode_mac CRC by thanhmai on Jul 14, 2011			thanhmai Posts: 1 Joined: Jan 17, 2011 Last seen: Apr 17, 2026
thanks thanks

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