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7df9186 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | // Speed test client
// A lot like a UDP echo, but more satisfying because it actually
// changes the data that flows through it.
// Compatible with ethernet-core/core/client_thru.v
// and ethernet-core/runtime/udprtx.c
module speed_test(
input clk,
input nomangle, // software settable
// client interface with RTEFI, see doc/clients.eps
input [10:0] len_c,
input [7:0] idata,
input raw_l,
input raw_s,
output [7:0] odata
);
parameter n_lat=2; // minimum value is 1
// len_c counts down to 9, but we need something that counts up from 0
reg [7:0] count=0;
reg [7:0] processed=0;
always @(posedge clk) begin
count <= raw_s ? count+1 : 0;
processed <= idata ^ (count & {8{~nomangle}});
end
// 13 bits input, 8 bits output, choose to pipeline output
reg_delay #(.len(n_lat-1), .dw(8)) align(.clk(clk), .gate(1'b1), .reset(1'b0),
.din(processed), .dout(odata));
endmodule
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