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Adding pushback circuit to stimulus

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This commit is contained in:
Andreas Olofsson 2015-11-24 01:04:14 -05:00
parent d6499aa918
commit 162cb022f9
1 changed files with 24 additions and 1 deletions
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25
common/dv/stimulus.v
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@ -19,6 +19,7 @@ module stimulus (/*AUTOARG*/
parameter MD = 1<<MAW; //limit test to 1K transactions
parameter INDEX = 1;
parameter NAME = "not_declared";
parameter WAIT = 1;
//Inputs
input clk;
@ -51,6 +52,7 @@ module stimulus (/*AUTOARG*/
integer fd;
reg [128*8:0] str;
reg [31:0] stim_end;
wire stall_random;
//Read Stimulus
initial begin
@ -137,7 +139,28 @@ module stimulus (/*AUTOARG*/
//seed from command line?
//walk through the waits:0,1,2,3,4,5,6,7,8,16,32,64,128 cycles
//randomize where you start in state machine
assign stim_wait = 1'b0;
assign stim_wait = stall_random;
//Random wait generator
//TODO: make this a module
generate
if(WAIT)
begin
reg [15:0] stall_counter;
always @ (posedge clk or negedge nreset)
if(!nreset)
stall_counter[15:0] <= 'b0;
else
stall_counter[15:0] <= stall_counter+1'b1;
assign stall_random = (|stall_counter[6:0]);//(|wait_counter[3:0]);//1'b0;
end
else
begin
assign stall_random = 1'b0;
end // else: !if(WAIT)
endgenerate
endmodule // stimulus