code refactoring for Vivado compatibility
This commit is contained in:
Blaise Tine
250
hw/rtl/libs/VX_rr_arbiter.sv
Normal file
250
hw/rtl/libs/VX_rr_arbiter.sv
Normal file
@@ -0,0 +1,250 @@
|
||||
`include "VX_platform.vh"
|
||||
|
||||
`TRACING_OFF
|
||||
module VX_rr_arbiter #(
|
||||
parameter NUM_REQS = 1,
|
||||
parameter LOCK_ENABLE = 0,
|
||||
parameter MODEL = 1,
|
||||
parameter LOG_NUM_REQS = $clog2(NUM_REQS)
|
||||
) (
|
||||
input wire clk,
|
||||
input wire reset,
|
||||
input wire enable,
|
||||
input wire [NUM_REQS-1:0] requests,
|
||||
output wire [LOG_NUM_REQS-1:0] grant_index,
|
||||
output wire [NUM_REQS-1:0] grant_onehot,
|
||||
output wire grant_valid
|
||||
);
|
||||
|
||||
if (NUM_REQS == 1) begin
|
||||
|
||||
`UNUSED_VAR (clk)
|
||||
`UNUSED_VAR (reset)
|
||||
|
||||
assign grant_index = 0;
|
||||
assign grant_onehot = requests;
|
||||
assign grant_valid = requests[0];
|
||||
|
||||
end else if (NUM_REQS == 2) begin
|
||||
|
||||
reg [LOG_NUM_REQS-1:0] grant_index_r;
|
||||
reg [NUM_REQS-1:0] grant_onehot_r;
|
||||
reg [LOG_NUM_REQS-1:0] state;
|
||||
|
||||
always @(*) begin
|
||||
casez ({state, requests})
|
||||
3'b0_01,
|
||||
3'b1_?1: begin grant_onehot_r = 2'b01; grant_index_r = LOG_NUM_REQS'(0); end
|
||||
default: begin grant_onehot_r = 2'b10; grant_index_r = LOG_NUM_REQS'(1); end
|
||||
endcase
|
||||
end
|
||||
|
||||
always @(posedge clk) begin
|
||||
if (reset) begin
|
||||
state <= 0;
|
||||
end else if (!LOCK_ENABLE || enable) begin
|
||||
state <= grant_index_r;
|
||||
end
|
||||
end
|
||||
|
||||
assign grant_index = grant_index_r;
|
||||
assign grant_onehot = grant_onehot_r;
|
||||
assign grant_valid = (| requests);
|
||||
|
||||
end else if (NUM_REQS == 4) begin
|
||||
|
||||
reg [LOG_NUM_REQS-1:0] grant_index_r;
|
||||
reg [NUM_REQS-1:0] grant_onehot_r;
|
||||
reg [LOG_NUM_REQS-1:0] state;
|
||||
|
||||
always @(*) begin
|
||||
casez ({state, requests})
|
||||
6'b00_0001,
|
||||
6'b01_00?1,
|
||||
6'b10_0??1,
|
||||
6'b11_???1: begin grant_onehot_r = 4'b0001; grant_index_r = LOG_NUM_REQS'(0); end
|
||||
6'b00_??1?,
|
||||
6'b01_0010,
|
||||
6'b10_0?10,
|
||||
6'b11_??10: begin grant_onehot_r = 4'b0010; grant_index_r = LOG_NUM_REQS'(1); end
|
||||
6'b00_?10?,
|
||||
6'b01_?1??,
|
||||
6'b10_0100,
|
||||
6'b11_?100: begin grant_onehot_r = 4'b0100; grant_index_r = LOG_NUM_REQS'(2); end
|
||||
default: begin grant_onehot_r = 4'b1000; grant_index_r = LOG_NUM_REQS'(3); end
|
||||
endcase
|
||||
end
|
||||
|
||||
always @(posedge clk) begin
|
||||
if (reset) begin
|
||||
state <= 0;
|
||||
end else if (!LOCK_ENABLE || enable) begin
|
||||
state <= grant_index_r;
|
||||
end
|
||||
end
|
||||
|
||||
assign grant_index = grant_index_r;
|
||||
assign grant_onehot = grant_onehot_r;
|
||||
assign grant_valid = (| requests);
|
||||
|
||||
end else if (NUM_REQS == 8) begin
|
||||
|
||||
reg [LOG_NUM_REQS-1:0] grant_index_r;
|
||||
reg [NUM_REQS-1:0] grant_onehot_r;
|
||||
reg [LOG_NUM_REQS-1:0] state;
|
||||
|
||||
always @(*) begin
|
||||
casez ({state, requests})
|
||||
11'b000_00000001,
|
||||
11'b001_000000?1,
|
||||
11'b010_00000??1,
|
||||
11'b011_0000???1,
|
||||
11'b100_000????1,
|
||||
11'b101_00?????1,
|
||||
11'b110_0??????1,
|
||||
11'b111_???????1: begin grant_onehot_r = 8'b00000001; grant_index_r = LOG_NUM_REQS'(0); end
|
||||
11'b000_??????1?,
|
||||
11'b001_00000010,
|
||||
11'b010_00000?10,
|
||||
11'b011_0000??10,
|
||||
11'b100_000???10,
|
||||
11'b101_00????10,
|
||||
11'b110_0?????10,
|
||||
11'b111_??????10: begin grant_onehot_r = 8'b00000010; grant_index_r = LOG_NUM_REQS'(1); end
|
||||
11'b000_?????10?,
|
||||
11'b001_?????1??,
|
||||
11'b010_00000100,
|
||||
11'b011_0000?100,
|
||||
11'b100_000??100,
|
||||
11'b101_00???100,
|
||||
11'b110_0????100,
|
||||
11'b111_?????100: begin grant_onehot_r = 8'b00000100; grant_index_r = LOG_NUM_REQS'(2); end
|
||||
11'b000_????100?,
|
||||
11'b001_????10??,
|
||||
11'b010_????1???,
|
||||
11'b011_00001000,
|
||||
11'b100_000?1000,
|
||||
11'b101_00??1000,
|
||||
11'b110_0???1000,
|
||||
11'b111_????1000: begin grant_onehot_r = 8'b00001000; grant_index_r = LOG_NUM_REQS'(3); end
|
||||
11'b000_???1000?,
|
||||
11'b001_???100??,
|
||||
11'b010_???10???,
|
||||
11'b011_???1????,
|
||||
11'b100_00010000,
|
||||
11'b101_00?10000,
|
||||
11'b110_0??10000,
|
||||
11'b111_???10000: begin grant_onehot_r = 8'b00010000; grant_index_r = LOG_NUM_REQS'(4); end
|
||||
11'b000_??10000?,
|
||||
11'b001_??1000??,
|
||||
11'b010_??100???,
|
||||
11'b011_??10????,
|
||||
11'b100_??1?????,
|
||||
11'b101_00100000,
|
||||
11'b110_0?100000,
|
||||
11'b111_??100000: begin grant_onehot_r = 8'b00100000; grant_index_r = LOG_NUM_REQS'(5); end
|
||||
11'b000_?100000?,
|
||||
11'b001_?10000??,
|
||||
11'b010_?1000???,
|
||||
11'b011_?100????,
|
||||
11'b100_?10?????,
|
||||
11'b101_?1??????,
|
||||
11'b110_01000000,
|
||||
11'b111_?1000000: begin grant_onehot_r = 8'b01000000; grant_index_r = LOG_NUM_REQS'(6); end
|
||||
default: begin grant_onehot_r = 8'b10000000; grant_index_r = LOG_NUM_REQS'(7); end
|
||||
endcase
|
||||
end
|
||||
|
||||
always @(posedge clk) begin
|
||||
if (reset) begin
|
||||
state <= 0;
|
||||
end else if (!LOCK_ENABLE || enable) begin
|
||||
state <= grant_index_r;
|
||||
end
|
||||
end
|
||||
|
||||
assign grant_index = grant_index_r;
|
||||
assign grant_onehot = grant_onehot_r;
|
||||
assign grant_valid = (| requests);
|
||||
|
||||
end else if (MODEL == 1) begin
|
||||
|
||||
`IGNORE_WARNINGS_BEGIN
|
||||
wire [NUM_REQS-1:0] mask_higher_pri_regs, unmask_higher_pri_regs;
|
||||
`IGNORE_WARNINGS_END
|
||||
wire [NUM_REQS-1:0] grant_masked, grant_unmasked;
|
||||
|
||||
reg [NUM_REQS-1:0] pointer_reg;
|
||||
|
||||
wire [NUM_REQS-1:0] req_masked = requests & pointer_reg;
|
||||
|
||||
assign mask_higher_pri_regs[NUM_REQS-1:1] = mask_higher_pri_regs[NUM_REQS-2:0] | req_masked[NUM_REQS-2:0];
|
||||
assign mask_higher_pri_regs[0] = 1'b0;
|
||||
assign grant_masked[NUM_REQS-1:0] = req_masked[NUM_REQS-1:0] & ~mask_higher_pri_regs[NUM_REQS-1:0];
|
||||
|
||||
assign unmask_higher_pri_regs[NUM_REQS-1:1] = unmask_higher_pri_regs[NUM_REQS-2:0] | requests[NUM_REQS-2:0];
|
||||
assign unmask_higher_pri_regs[0] = 1'b0;
|
||||
assign grant_unmasked[NUM_REQS-1:0] = requests[NUM_REQS-1:0] & ~unmask_higher_pri_regs[NUM_REQS-1:0];
|
||||
|
||||
wire no_req_masked = ~(|req_masked);
|
||||
assign grant_onehot = ({NUM_REQS{no_req_masked}} & grant_unmasked) | grant_masked;
|
||||
|
||||
always @(posedge clk) begin
|
||||
if (reset) begin
|
||||
pointer_reg <= {NUM_REQS{1'b1}};
|
||||
end else if (!LOCK_ENABLE || enable) begin
|
||||
if (|req_masked) begin
|
||||
pointer_reg <= mask_higher_pri_regs;
|
||||
end else if (|requests) begin
|
||||
pointer_reg <= unmask_higher_pri_regs;
|
||||
end else begin
|
||||
pointer_reg <= pointer_reg;
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
assign grant_valid = (| requests);
|
||||
|
||||
VX_onehot_encoder #(
|
||||
.N (NUM_REQS)
|
||||
) onehot_encoder (
|
||||
.data_in (grant_onehot),
|
||||
.data_out (grant_index),
|
||||
`UNUSED_PIN (valid_out)
|
||||
);
|
||||
|
||||
end else begin
|
||||
|
||||
reg [LOG_NUM_REQS-1:0] grant_index_r;
|
||||
reg [NUM_REQS-1:0] grant_onehot_r;
|
||||
reg [NUM_REQS-1:0] state;
|
||||
|
||||
always @(*) begin
|
||||
grant_index_r = 'x;
|
||||
grant_onehot_r = 'x;
|
||||
for (integer i = 0; i < NUM_REQS; ++i) begin
|
||||
for (integer j = 0; j < NUM_REQS; ++j) begin
|
||||
if (state[i] && requests[(j + 1) % NUM_REQS]) begin
|
||||
grant_index_r = LOG_NUM_REQS'((j + 1) % NUM_REQS);
|
||||
grant_onehot_r = '0;
|
||||
grant_onehot_r[(j + 1) % NUM_REQS] = 1;
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
always @(posedge clk) begin
|
||||
if (reset) begin
|
||||
state <= 0;
|
||||
end else if (!LOCK_ENABLE || enable) begin
|
||||
state <= grant_index_r;
|
||||
end
|
||||
end
|
||||
|
||||
assign grant_index = grant_index_r;
|
||||
assign grant_onehot = grant_onehot_r;
|
||||
assign grant_valid = (| requests);
|
||||
end
|
||||
|
||||
endmodule
|
||||
`TRACING_ON
|
||||
Reference in New Issue
Block a user