zcy
/
pluto_hdl_adi
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

util_dec256sinc24b: Fix the accumulator 

Do a similar fix as for the decimation stage. (ab2788)
main
Istvan Csomortani 2019-04-08 18:02:11 +03:00 committed by István Csomortáni
parent 10e1abc22f
commit 77ffa1f8ac
1 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
library/common/util_dec256sinc24b.v
View File

@ -57,6 +57,9 @@ module util_dec256sinc24b (
reg word_en = 1'b0;
reg enable = 1'b0;
wire [36:0] acc1_s;
wire [36:0] acc2_s;
wire [36:0] acc3_s;
wire [36:0] diff1_s;
wire [36:0] diff2_s;
wire [36:0] diff3_s;
@ -82,11 +85,14 @@ module util_dec256sinc24b (
acc3 <= 37'd0;
end else begin
/* perform accumulation process */
acc1 <= acc1 + data_int;
acc2 <= acc2 + acc1;
acc3 <= acc3 + acc2;
acc1 <= acc1_s;
acc2 <= acc2_s;
acc3 <= acc3_s;
end
end
assign acc1_s = acc1 + data_int;
assign acc2_s = acc2 + acc1;
assign acc3_s = acc3 + acc2;
/* decimation stage (MCLKOUT/WORD_CLK) */
@ -118,16 +124,16 @@ module util_dec256sinc24b (
always @(posedge clk) begin
if (reset == 1'b1) begin
acc3_d <= 37'd0;
diff1_d <= 37'd0;
diff2_d <= 37'd0;
acc3_d <= 37'b0;
end else if (word_en == 1'b1) begin
acc3_d <= acc3;
acc3_d <= acc3;
diff1_d <= diff1_s;
diff2_d <= diff2_s;
end
end
assign diff1_s = acc3 - acc3_d;
assign diff1_s = acc3_s - acc3;
assign diff2_s = diff1_s - diff1_d;
assign diff3_s = diff2_s - diff2_d;