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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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58
hw/rtl/libs/VX_matrix_arbiter.v
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@@ -1,17 +1,20 @@
`include "VX_platform.vh"
module VX_matrix_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)
@@ -22,11 +25,12 @@ module VX_matrix_arbiter #(
end else begin
reg [N-1:1] state [N-1:0];
wire [N-1:0] pri [N-1:0];
reg [NUM_REQS-1:1] state [NUM_REQS-1:0];
wire [NUM_REQS-1:0] pri [NUM_REQS-1:0];
wire [NUM_REQS-1:0] grant_unqual;
for (genvar i = 0; i < N; i++) begin
for (genvar j = 0; j < N; j++) begin
for (genvar i = 0; i < NUM_REQS; i++) begin
for (genvar j = 0; j < NUM_REQS; j++) begin
if (j > i) begin
assign pri[j][i] = requests[i] && state[i][j];
end
@@ -37,28 +41,42 @@ module VX_matrix_arbiter #(
assign pri[j][i] = 0;
end
end
assign grant_onehot[i] = requests[i] && !(| pri[i]);
assign grant_unqual[i] = requests[i] && !(| pri[i]);
end
for (genvar i = 0; i < N; i++) begin
for (genvar j = i + 1; j < N; j++) begin
for (genvar i = 0; i < NUM_REQS; i++) begin
for (genvar j = i + 1; j < NUM_REQS; j++) begin
always @(posedge clk) begin
if (reset) begin
state[i][j] <= 0;
end else begin
state[i][j] <= (state[i][j] || grant_onehot[j]) && !grant_onehot[i];
state[i][j] <= (state[i][j] || grant_unqual[j]) && !grant_unqual[i];
end
end
end
end
if (LOCK_ENABLE == 0) begin
`UNUSED_VAR (enable)
assign grant_onehot = grant_unqual;
end else begin
reg [NUM_REQS-1:0] grant_unqual_prev;
always @(posedge clk) begin
if (reset) begin
grant_unqual_prev <= 0;
end else if (enable) begin
grant_unqual_prev <= grant_unqual;
end
end
assign grant_onehot = enable ? grant_unqual : grant_unqual_prev;
end
VX_onehot_encoder #(
.N(N)
.NUM_REQS(NUM_REQS)
) encoder (
.onehot (grant_onehot),
.onehot (grant_unqual),
`UNUSED_PIN (valid),
.value (grant_index)
.binary (grant_index)
);
assign grant_valid = (| requests);