From 034eeacfe8d35b0e9733dd9183f1a9dbed78f347 Mon Sep 17 00:00:00 2001
From: Matt Ettus <matt@ettus.com>
Date: Tue, 16 Feb 2010 10:24:18 -0800
Subject: basic read support for the GPMC, responds with 16'hBEEF
---
usrp2/top/safe_u1e/safe_u1e.v | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
(limited to 'usrp2/top/safe_u1e')
diff --git a/usrp2/top/safe_u1e/safe_u1e.v b/usrp2/top/safe_u1e/safe_u1e.v
index 3f16d941c..ddd203cf9 100644
--- a/usrp2/top/safe_u1e/safe_u1e.v
+++ b/usrp2/top/safe_u1e/safe_u1e.v
@@ -7,7 +7,7 @@ module safe_u1e
output [2:0] debug_led, output [31:0] debug, output [1:0] debug_clk,
// GPMC
- input EM_CLK, input [15:0] EM_D, input [10:1] EM_A,
+ input EM_CLK, inout [15:0] EM_D, input [10:1] EM_A,
input EM_WAIT0, input EM_NCS4, input EM_NWP, input EM_NWE, input EM_NOE, input EM_NADV_ALE
);
@@ -27,5 +27,11 @@ module safe_u1e
assign debug_clk = { EM_CLK, clk_fpga };
assign debug = { { EM_WAIT0, EM_NADV_ALE, EM_NWP, EM_NCS4, EM_NWE, EM_NOE, EM_A[10:1] },
{ EM_D } };
-
+
+ wire EM_output_enable = (~EM_NOE & ~EM_NCS4);
+ wire [15:0] EM_D_out = 16'hBEEF;
+ wire [15:0] EM_D_in = EM_D;
+
+ assign EM_D = EM_output_enable ? EM_D_out : 16'bz;
+
endmodule // safe_u2plus
--
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