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minor updates

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This commit is contained in:
Blaise Tine
2021-01-17 13:58:43 -08:00
parent 98945df5ae
commit ed216ab39d
9 changed files with 65 additions and 30 deletions
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54
hw/rtl/libs/VX_fifo_queue.v
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@@ -3,6 +3,8 @@
module VX_fifo_queue #(
parameter DATAW = 1,
parameter SIZE = 2,
parameter ALM_FULL = (SIZE - 1),
parameter ALM_EMPTY= 1,
parameter ADDRW = $clog2(SIZE),
parameter SIZEW = $clog2(SIZE+1),
parameter BUFFERED = 0,
@@ -14,8 +16,10 @@ module VX_fifo_queue #(
input wire pop,
input wire [DATAW-1:0] data_in,
output wire [DATAW-1:0] data_out,
output wire empty,
output wire full,
output wire empty,
output wire alm_empty,
output wire full,
output wire alm_full,
output wire [SIZEW-1:0] size
);
`STATIC_ASSERT(`ISPOW2(SIZE), ("must be 0 or power of 2!"))
@@ -45,37 +49,47 @@ module VX_fifo_queue #(
end
end
assign data_out = head_r;
assign empty = (size_r == 0);
assign full = (size_r != 0);
assign size = size_r;
assign data_out = head_r;
assign empty = (size_r == 0);
assign alm_empty = 1'b1;
assign full = (size_r != 0);
assign alm_full = 1'b1;
assign size = size_r;
end else begin
reg empty_r;
reg full_r;
reg empty_r, alm_empty_r;
reg full_r, alm_full_r;
reg [ADDRW-1:0] used_r;
always @(posedge clk) begin
if (reset) begin
empty_r <= 1;
full_r <= 0;
used_r <= 0;
empty_r <= 1;
alm_empty_r <= 1;
full_r <= 0;
alm_full_r <= 0;
used_r <= 0;
end else begin
assert(!push || !full);
assert(!pop || !empty);
if (push) begin
if (!pop) begin
empty_r <= 0;
if (used_r == ADDRW'(SIZE-1)) begin
if (used_r == ADDRW'(ALM_EMPTY))
alm_empty_r <= 0;
if (used_r == ADDRW'(SIZE-1))
full_r <= 1;
end
if (used_r == ADDRW'(ALM_FULL-1))
alm_full_r <= 1;
end
end else if (pop) begin
full_r <= 0;
if (used_r == ADDRW'(1)) begin
full_r <= 0;
if (used_r == ADDRW'(ALM_FULL))
alm_full_r <= 0;
if (used_r == ADDRW'(1))
empty_r <= 1;
end;
if (used_r == ADDRW'(ALM_EMPTY+1))
alm_empty_r <= 1;
end
used_r <= used_r + ADDRW'($signed(2'(push) - 2'(pop)));
end
@@ -169,9 +183,11 @@ module VX_fifo_queue #(
assign data_out = dout_r;
end
assign empty = empty_r;
assign full = full_r;
assign size = {full_r, used_r};
assign empty = empty_r;
assign alm_empty = alm_empty_r;
assign full = full_r;
assign alm_full = alm_full_r;
assign size = {full_r, used_r};
end
endmodule