From 0d82a8aa4f71c5e67e17d2ad91c1c4b2c783afa8 Mon Sep 17 00:00:00 2001
From: Blaise Tine <tinebp@iam-ssh1.research.intel-research.net>
Date: Thu, 30 Jul 2020 03:09:11 -0700
Subject: [PATCH] minor update

---
 hw/rtl/VX_ipdom_stack.v | 47 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 hw/rtl/VX_ipdom_stack.v

diff --git a/hw/rtl/VX_ipdom_stack.v b/hw/rtl/VX_ipdom_stack.v
new file mode 100644
index 00000000..d12f7d98
--- /dev/null
+++ b/hw/rtl/VX_ipdom_stack.v
@@ -0,0 +1,47 @@
+
+`include "VX_platform.vh"
+
+module VX_ipdom_stack #(
+    parameter WIDTH = 1,
+    parameter DEPTH = 1
+) (
+    input  wire              clk,
+    input  wire              reset,
+    input  reg [WIDTH - 1:0] q1,
+    input  reg [WIDTH - 1:0] q2,
+    output wire[WIDTH - 1:0] d,
+    input  wire              push,
+    input  wire              pop,
+    output wire              empty,
+    output wire              full
+);
+    localparam STACK_SIZE = 2 ** DEPTH;
+
+    `USE_FAST_BRAM reg [WIDTH-1:0] stack_1 [0:STACK_SIZE-1];
+    `USE_FAST_BRAM reg [WIDTH-1:0] stack_2 [0:STACK_SIZE-1];
+    `USE_FAST_BRAM reg             is_part [0:STACK_SIZE-1];
+    
+    reg [DEPTH-1:0] rd_ptr, wr_ptr;
+
+    always @(posedge clk) begin
+        if (reset) begin   
+            wr_ptr <= 0;
+        end else if (push) begin
+            stack_1[wr_ptr] <= q1;
+            stack_2[wr_ptr] <= q2;
+            is_part[wr_ptr] <= 0;            
+            rd_ptr <= wr_ptr;
+            wr_ptr <= wr_ptr + 1;
+        end else if (pop) begin            
+            wr_ptr <= wr_ptr - DEPTH'(is_part[rd_ptr]);
+            rd_ptr <= rd_ptr - DEPTH'(is_part[rd_ptr]);
+            is_part[rd_ptr] <= 1;
+        end
+    end
+
+    assign d = is_part[rd_ptr] ? stack_1[rd_ptr] : stack_2[rd_ptr];
+
+    assign empty = (0 == wr_ptr);
+    assign full  = ((STACK_SIZE-1) == wr_ptr);
+
+endmodule
\ No newline at end of file