Merge pull request #1851 from YosysHQ/claire/bitselwrite

Improved rewrite code for writing to bit slice

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/various/dynamic_part_select/reset_test.v b/tests/various/dynamic_part_select/reset_test.v
new file mode 100644
index 000000000..29355aafb
--- /dev/null
+++ b/tests/various/dynamic_part_select/reset_test.v
@@ -0,0 +1,23 @@
+module reset_test  #(parameter WIDTH=32, SELW=1, CTRLW=$clog2(WIDTH), DINW=2**SELW)
+   (input                  clk,
+    input [CTRLW-1:0] 	   ctrl,
+    input [DINW-1:0] 	   din,
+    input [SELW-1:0] 	   sel,
+    output reg [WIDTH-1:0] dout);
+   
+   reg [SELW:0] 		   i;
+   wire [SELW-1:0] 	   rval = {reset, {SELW-1{1'b0}}};
+   localparam SLICE = WIDTH/(SELW**2);
+   // Doing exotic reset. masking 2 LSB bits to 0, 6 MSB bits to 1 for
+   // whatever reason.
+   always @(posedge clk) begin
+      if (reset) begin: reset_mask
+         for (i = 0; i < {SELW{1'b1}}; i=i+1) begin
+            dout[i*rval+:SLICE] <= 32'hDEAD;
+         end
+      end
+      //else begin
+      dout[ctrl*sel+:SLICE] <= din;
+      //end
+   end
+endmodule