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util_wfifo: read after write is complete

main
Rejeesh Kutty 2016-07-11 09:59:31 -04:00
parent 832efdc99c
commit 4f0d7bd6eb
3 changed files with 23 additions and 11 deletions
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32
library/util_wfifo/util_wfifo.v
View File

@ -180,15 +180,18 @@ module util_wfifo (
reg din_wr = 'd0;
reg [(ADDRESS_WIDTH-1):0] din_waddr = 'd0;
reg din_req_t = 'd0;
reg [(ADDRESS_WIDTH-4):0] din_rinit = 'd0;
reg din_ovf_m1 = 'd0;
reg din_ovf = 'd0;
reg dout_req_t_m1 = 'd0;
reg dout_req_t_m2 = 'd0;
reg dout_req_t_m3 = 'd0;
reg dout_req_t = 'd0;
reg [(ADDRESS_WIDTH-4):0] dout_rinit = 'd0;
reg dout_ovf_d = 'd0;
reg [ 3:0] dout_req_cnt = 'd0;
reg [(ADDRESS_WIDTH-1):0] dout_raddr = 'd0;
reg dout_rd = 'd0;
reg dout_rd_d = 'd0;
reg dout_valid = 'd0;
reg [ 7:0] dout_enable_m1 = 'd0;
reg [ 7:0] dout_enable = 'd0;
@ -216,8 +219,8 @@ module util_wfifo (
assign din_data_s = { din_data_7, din_data_6, din_data_5, din_data_4,
din_data_3, din_data_2, din_data_1, din_data_0};
// simple data transfer-- no ovf/unf handling- read-bw > write-bw
// dout_width >= din_width only
// simple data transfer-- no ovf/unf handling- read-bw > write-bw (equal will NOT work)
// dout_width >= din_width only-
generate
for (n = 0; n < NUM_OF_CHANNELS; n = n + 1) begin: g_in
@ -247,6 +250,7 @@ module util_wfifo (
din_wr <= 1'd0;
din_waddr <= 'd0;
din_req_t <= 1'd0;
din_rinit <= 'd0;
din_ovf_m1 <= 'd0;
din_ovf <= 'd0;
end else begin
@ -263,8 +267,9 @@ module util_wfifo (
if (din_wr == 1'b1) begin
din_waddr <= din_waddr + 1'b1;
end
if ((din_wr == 1'b1) && (din_waddr[2:0] == 3'd0)) begin
if ((din_wr == 1'b1) && (din_waddr[2:0] == 3'd7)) begin
din_req_t <= ~din_req_t;
din_rinit <= din_waddr[(ADDRESS_WIDTH-1):3];
end
din_ovf_m1 <= dout_ovf_d;
din_ovf <= din_ovf_m1;
@ -280,11 +285,17 @@ module util_wfifo (
dout_req_t_m1 <= 'd0;
dout_req_t_m2 <= 'd0;
dout_req_t_m3 <= 'd0;
dout_req_t <= 'd0;
dout_rinit <= 'd0;
dout_ovf_d <= 'd0;
end else begin
dout_req_t_m1 <= din_req_t;
dout_req_t_m2 <= dout_req_t_m1;
dout_req_t_m3 <= dout_req_t_m2;
dout_req_t <= dout_req_t_s;
if (dout_req_t_s == 1'b1) begin
dout_rinit <= din_rinit;
end
dout_ovf_d <= dout_ovf;
end
end
@ -292,20 +303,19 @@ module util_wfifo (
always @(posedge dout_clk or negedge dout_rstn) begin
if (dout_rstn == 1'b0) begin
dout_req_cnt <= 'd0;
dout_raddr <= 'd0;
dout_rd <= 'd0;
dout_raddr <= 'd8;
dout_rd_d <= 'd0;
dout_valid <= 'd0;
end else begin
if (dout_req_t_s == 1'b1) begin
if (dout_req_t == 1'b1) begin
dout_req_cnt <= 4'h8;
dout_raddr <= {dout_rinit, 3'd0};
end else if (dout_req_cnt[3] == 1'b1) begin
dout_req_cnt <= dout_req_cnt + 1'b1;
end
if (dout_req_cnt[3] == 1'b1) begin
dout_raddr <= dout_raddr + 1'b1;
end
dout_rd <= dout_req_cnt[3];
dout_valid <= dout_rd;
dout_rd_d <= dout_req_cnt[3];
dout_valid <= dout_rd_d;
end
end

1
library/util_wfifo/util_wfifo_constr.sdc
View File

@ -1,5 +1,6 @@
set_false_path -from [get_registers *din_enable*] -to [get_registers *dout_enable_m1*]
set_false_path -from [get_registers *din_req_t*] -to [get_registers *dout_req_t_m1*]
set_false_path -from [get_registers *din_rinit*] -to [get_registers *dout_rinit*]
set_false_path -from [get_registers *dout_ovf_d*] -to [get_registers *din_ovf_m1*]

1
library/util_wfifo/util_wfifo_constr.xdc
View File

@ -5,5 +5,6 @@ set_property shreg_extract no [get_cells -hier -filter {name =~ *din_ovf_m*}]
set_false_path -from [get_cells -hier -filter {name =~ *din_enable* && IS_SEQUENTIAL}] -to [get_cells -hier -filter {name =~ *dout_enable_m1* && IS_SEQUENTIAL}]
set_false_path -from [get_cells -hier -filter {name =~ *din_req_t* && IS_SEQUENTIAL}] -to [get_cells -hier -filter {name =~ *dout_req_t_m1* && IS_SEQUENTIAL}]
set_false_path -from [get_cells -hier -filter {name =~ *din_rinit* && IS_SEQUENTIAL}] -to [get_cells -hier -filter {name =~ *dout_rinit* && IS_SEQUENTIAL}]
set_false_path -from [get_cells -hier -filter {name =~ *dout_ovf* && IS_SEQUENTIAL}] -to [get_cells -hier -filter {name =~ *din_ovf_m1* && IS_SEQUENTIAL}]