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Add port to show index of granted signal #2

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merged 1 commit into from Dec 8, 2014
Merged

Add port to show index of granted signal #2

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15 changes: 15 additions & 0 deletions src/arbiter.v
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Expand Up @@ -31,9 +31,22 @@ module arbiter
input rst,
input [NUM_PORTS-1:0] request,
output reg [NUM_PORTS-1:0] grant,
output reg [$clog2(NUM_PORTS)-1:0] sel,
output reg active
);

// Find First 1 - Start from MSB and count downwards, returns 0 when no bit set
function [$clog2(NUM_PORTS)-1:0] ff1;
input [NUM_PORTS-1:0] in;
integer i;
begin
ff1 = 0;
for (i = NUM_PORTS-1; i >= 0; i=i-1) begin
if (in[i])
ff1 = i;
end
end
endfunction

/**
* Local parameters
Expand Down Expand Up @@ -72,6 +85,8 @@ module arbiter
always @(posedge clk)
grant <= token & request;

always @(posedge clk)
sel <= ff1(token & request);

always @(posedge clk)
active <= |(token & request);
Expand Down