From 975aaf190f0bbbeacc253397ccada6889c69e8f7 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Wed, 28 Aug 2019 09:24:19 -0700
Subject: Add xilinx_srl test

---
 tests/xilinx/xilinx_srl.v | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tests/xilinx/xilinx_srl.v

(limited to 'tests/xilinx/xilinx_srl.v')

diff --git a/tests/xilinx/xilinx_srl.v b/tests/xilinx/xilinx_srl.v
new file mode 100644
index 000000000..bc2a15ab2
--- /dev/null
+++ b/tests/xilinx/xilinx_srl.v
@@ -0,0 +1,40 @@
+module xilinx_srl_static_test(input i, clk, output [1:0] q);
+reg head = 1'b0;
+reg [3:0] shift1 = 4'b0000;
+reg [3:0] shift2 = 4'b0000;
+
+always @(posedge clk) begin
+    head <= i;
+    shift1 <= {shift1[2:0], head};
+    shift2 <= {shift2[2:0], head};
+end
+
+assign q = {shift2[3], shift1[3]};
+endmodule
+
+module xilinx_srl_variable_test(input i, clk, input [1:0] l1, l2, output [1:0] q);
+reg head = 1'b0;
+reg [3:0] shift1 = 4'b0000;
+reg [3:0] shift2 = 4'b0000;
+
+always @(posedge clk) begin
+    head <= i;
+    shift1 <= {shift1[2:0], head};
+    shift2 <= {shift2[2:0], head};
+end
+
+assign q = {shift2[l2], shift1[l1]};
+endmodule
+
+module $__XILINX_SHREG_(input C, D, E, input [1:0] L, output Q);
+parameter CLKPOL = 1;
+parameter ENPOL = 1;
+parameter DEPTH = 1;
+parameter [DEPTH-1:0] INIT = {DEPTH{1'b0}};
+reg [DEPTH-1:0] r = INIT;
+wire clk = C ^ CLKPOL;
+always @(posedge C)
+    if (E) 
+        r <= { r[DEPTH-2:0], D };
+assign Q = r[L];
+endmodule
-- 
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