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adding stream arbiter

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This commit is contained in:
Blaise Tine
2020-12-03 06:40:23 -08:00
parent f575f16f57
commit f3b1069ce8
33 changed files with 717 additions and 745 deletions
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46
hw/rtl/libs/VX_rr_arbiter.v
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@@ -1,17 +1,20 @@
`include "VX_platform.vh"
module VX_rr_arbiter #(
parameter N = 1
parameter NUM_REQS = 1,
parameter LOCK_ENABLE = 0,
parameter LOG_NUM_REQS = $clog2(NUM_REQS)
) (
input wire clk,
input wire reset,
input wire [N-1:0] requests,
output wire [`LOG2UP(N)-1:0] grant_index,
output wire [N-1:0] grant_onehot,
output wire grant_valid
input wire clk,
input wire reset,
input wire [NUM_REQS-1:0] requests,
input wire enable,
output wire [LOG_NUM_REQS-1:0] grant_index,
output wire [NUM_REQS-1:0] grant_onehot,
output wire grant_valid
);
if (N == 1) begin
if (NUM_REQS == 1) begin
`UNUSED_VAR (clk)
`UNUSED_VAR (reset)
@@ -22,31 +25,34 @@ module VX_rr_arbiter #(
end else begin
reg [`CLOG2(N)-1:0] grant_table [N-1:0];
reg [`CLOG2(N)-1:0] state;
reg [N-1:0] grant_onehot_r;
reg [LOG_NUM_REQS-1:0] grant_table [NUM_REQS-1:0];
reg [LOG_NUM_REQS-1:0] state;
always @(*) begin
for (integer i = 0; i < N; i++) begin
grant_table[i] = `CLOG2(N)'(i);
for (integer j = 0; j < N; j++) begin
if (requests[(i+j) % N]) begin
grant_table[i] = `CLOG2(N)'((i+j) % N);
for (integer i = 0; i < NUM_REQS; i++) begin
grant_table[i] = LOG_NUM_REQS'(i);
for (integer j = 0; j < NUM_REQS; j++) begin
if (requests[(i+j) % NUM_REQS]) begin
grant_table[i] = LOG_NUM_REQS'((i+j) % NUM_REQS);
end
end
end
grant_onehot_r = N'(0);
grant_onehot_r[grant_table[state]] = 1;
end
always @(posedge clk) begin
if (reset) begin
state <= 0;
end else begin
end else if (!LOCK_ENABLE || enable) begin
state <= grant_table[state];
end
end
reg [NUM_REQS-1:0] grant_onehot_r;
always @(*) begin
grant_onehot_r = NUM_REQS'(0);
grant_onehot_r[grant_table[state]] = 1;
end
assign grant_index = grant_table[state];
assign grant_onehot = grant_onehot_r;
assign grant_valid = (| requests);