| Line 19... |
Line 19... |
rxd = 0;
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rxd = 0;
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repeat (startup_skew) #0.1;
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repeat (startup_skew) #0.1;
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forever rx_clk = #4 ~rx_clk;
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forever rx_clk = #4 ~rx_clk;
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end
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end
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// Copied from: http://www.mindspring.com/~tcoonan/gencrc.v
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//
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// Generate a (DOCSIS) CRC32.
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//
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// Uses the GLOBAL variables:
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//
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// Globals referenced:
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// parameter CRC32_POLY = 32'h04C11DB7;
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// reg [ 7:0] crc32_packet[0:255];
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// integer crc32_length;
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//
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// Globals modified:
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// reg [31:0] crc32_result;
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//
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localparam CRC32_POLY = 32'h04C11DB7;
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task gencrc32;
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task gencrc32;
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input [31:09] crc32_length;
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input [7:0] length;
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integer cbyte, cbit;
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output [31:0] icrc;
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reg msb;
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reg [31:0] nxt_icrc;
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reg [7:0] current_cbyte;
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integer i, len;
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reg [31:0] temp;
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begin
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begin
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icrc = {32{1'b1}};
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crc32_result = 32'hffffffff;
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for (cbyte = 0; cbyte < crc32_length; cbyte = cbyte + 1) begin
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for (len=0; len<length; len=len+1)
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current_cbyte = rxbuf[cbyte];
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begin
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for (cbit = 0; cbit < 8; cbit = cbit + 1) begin
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nxt_icrc[7:0] = icrc[7:0] ^ rxbuf[len];
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msb = crc32_result[31];
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nxt_icrc[31:8] = icrc[31:8];
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crc32_result = crc32_result << 1;
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if (msb != current_cbyte[cbit]) begin
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for (i=0; i<8; i=i+1)
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crc32_result = crc32_result ^ CRC32_POLY;
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begin
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crc32_result[0] = 1;
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if (nxt_icrc[0])
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end
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nxt_icrc = nxt_icrc[31:1] ^ 32'hEDB88320;
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end
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else
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nxt_icrc = nxt_icrc[31:1];
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end
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end
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// Last step is to "mirror" every bit, swap the 4 bytes, and then complement each bit.
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icrc = nxt_icrc;
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//
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end // for (len=0; len<length; len=len+1)
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// Mirror:
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for (cbit = 0; cbit < 32; cbit = cbit + 1)
|
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temp[31-cbit] = crc32_result[cbit];
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|
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// Swap and Complement:
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icrc = ~icrc;
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crc32_result = ~{temp[7:0], temp[15:8], temp[23:16], temp[31:24]};
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end
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end
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endtask
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endtask
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|
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/* -----\/----- EXCLUDED -----\/-----
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// Copied from: http://www.mindspring.com/~tcoonan/gencrc.v
|
|
//
|
|
// Generate a (DOCSIS) CRC32.
|
|
//
|
|
// Uses the GLOBAL variables:
|
|
//
|
|
// Globals referenced:
|
|
// parameter CRC32_POLY = 32'h04C11DB7;
|
|
// reg [ 7:0] crc32_packet[0:255];
|
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// integer crc32_length;
|
|
//
|
|
// Globals modified:
|
|
// reg [31:0] crc32_result;
|
|
//
|
|
localparam CRC32_POLY = 32'h04C11DB7;
|
|
task gencrc32;
|
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input [31:09] crc32_length;
|
|
integer cbyte, cbit;
|
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reg msb;
|
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reg [7:0] current_cbyte;
|
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reg [31:0] temp;
|
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begin
|
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crc32_result = 32'hffffffff;
|
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for (cbyte = 0; cbyte < crc32_length; cbyte = cbyte + 1) begin
|
|
current_cbyte = rxbuf[cbyte];
|
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for (cbit = 0; cbit < 8; cbit = cbit + 1) begin
|
|
msb = crc32_result[31];
|
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crc32_result = crc32_result << 1;
|
|
if (msb != current_cbyte[cbit]) begin
|
|
crc32_result = crc32_result ^ CRC32_POLY;
|
|
crc32_result[0] = 1;
|
|
end
|
|
end
|
|
end
|
|
|
|
// Last step is to "mirror" every bit, swap the 4 bytes, and then complement each bit.
|
|
//
|
|
// Mirror:
|
|
for (cbit = 0; cbit < 32; cbit = cbit + 1)
|
|
temp[31-cbit] = crc32_result[cbit];
|
|
|
|
// Swap and Complement:
|
|
crc32_result = ~{temp[7:0], temp[15:8], temp[23:16], temp[31:24]};
|
|
end
|
|
endtask
|
|
-----/\----- EXCLUDED -----/\----- */
|
|
|
task print_packet;
|
task print_packet;
|
input [31:0] length;
|
input [31:0] length;
|
integer i;
|
integer i;
|
begin
|
begin
|
for (i=0; i<length; i=i+1)
|
for (i=0; i<length; i=i+1)
|
| Line 90... |
Line 120... |
{ rxbuf[0],rxbuf[1],rxbuf[2],rxbuf[3],rxbuf[4],rxbuf[5] } = da;
|
{ rxbuf[0],rxbuf[1],rxbuf[2],rxbuf[3],rxbuf[4],rxbuf[5] } = da;
|
{ rxbuf[6],rxbuf[7],rxbuf[8],rxbuf[9],rxbuf[10],rxbuf[11] } = sa;
|
{ rxbuf[6],rxbuf[7],rxbuf[8],rxbuf[9],rxbuf[10],rxbuf[11] } = sa;
|
for (p=12; p<length; p=p+1)
|
for (p=12; p<length; p=p+1)
|
rxbuf[p] = $random;
|
rxbuf[p] = $random;
|
|
|
gencrc32 (length);
|
//gencrc32 (length);
|
{ rxbuf[length-4], rxbuf[length-3],
|
gencrc32 (length, crc32_result);
|
rxbuf[length-2], rxbuf[length-1] } = crc32_result;
|
{ rxbuf[length-1], rxbuf[length-2],
|
|
rxbuf[length-3], rxbuf[length-4] } = crc32_result;
|
|
|
$display ("%m : Sending packet DA=%x SA=%x of length %0d", da, sa, length);
|
$display ("%m : Sending packet DA=%x SA=%x of length %0d", da, sa, length);
|
print_packet (length);
|
print_packet (length);
|
|
|
repeat (7)
|
repeat (7)
|
