From a8a02f97a89597aac8310dd1adff6909e62cb7b4 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Thu, 19 Jul 2012 20:35:37 -0700
Subject: e100: tighten timing - less routing on EM_A

There were a few places it was ok to use addr over EM_A.
This makes routing sligtly easier for GPMC signals.
---
 usrp2/gpmc/fifo_to_gpmc.v   | 2 +-
 usrp2/gpmc/gpmc_to_fifo.v   | 2 +-
 usrp2/top/E1x0/core_compile | 2 +-
 usrp2/top/E1x0/timing.ucf   | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

(limited to 'usrp2')

diff --git a/usrp2/gpmc/fifo_to_gpmc.v b/usrp2/gpmc/fifo_to_gpmc.v
index 27252b970..26443a702 100644
--- a/usrp2/gpmc/fifo_to_gpmc.v
+++ b/usrp2/gpmc/fifo_to_gpmc.v
@@ -82,7 +82,7 @@ module fifo_to_gpmc
             end
 
             GPMC_STATE_EMPTY: begin
-                if (EM_A == LAST_ADDR) begin
+                if (addr == LAST_ADDR) begin
                     gpmc_state <= GPMC_STATE_START;
                     gpmc_ptr <= next_gpmc_ptr;
                     addr <= 0;
diff --git a/usrp2/gpmc/gpmc_to_fifo.v b/usrp2/gpmc/gpmc_to_fifo.v
index 680095620..3932b81ac 100644
--- a/usrp2/gpmc/gpmc_to_fifo.v
+++ b/usrp2/gpmc/gpmc_to_fifo.v
@@ -75,7 +75,7 @@ module gpmc_to_fifo
             case(gpmc_state)
 
             GPMC_STATE_START: begin
-                if (EM_A == XFER_OFFSET) begin
+                if (data_i[16]) begin
                     gpmc_state <= GPMC_STATE_FILL;
                     vita_len <= EM_D;
                     next_gpmc_ptr <= gpmc_ptr + 1;
diff --git a/usrp2/top/E1x0/core_compile b/usrp2/top/E1x0/core_compile
index dd88094ff..ab992f29d 100755
--- a/usrp2/top/E1x0/core_compile
+++ b/usrp2/top/E1x0/core_compile
@@ -1,3 +1,3 @@
-iverilog -Wall -y. -y ../../control_lib/ -y ../../custom/ -y ../../fifo/ -y ../../gpmc/ -y ../../models/ -y ../../sdr_lib/ -y ../../coregen/ -y ../../vrt/ -y ../../opencores/i2c/rtl/verilog/ -y ../../opencores/spi/rtl/verilog/ -y ../../timing/ -y ../../opencores/8b10b/ -I ../../opencores/spi/rtl/verilog/ -I ../../opencores/i2c/rtl/verilog/ -y ../B100 -y $XILINX/verilog/src/unisims E100.v  2>&1  | grep -v timescale | grep -v coregen | grep -v models
+iverilog -Wall -y. -y ../../control_lib/ -y ../../custom/ -y ../../fifo/ -y ../../gpmc/ -y ../../models/ -y ../../sdr_lib/ -y ../../coregen/ -y ../../vrt/ -y ../../opencores/i2c/rtl/verilog/ -y ../../opencores/spi/rtl/verilog/ -y ../../timing/ -y ../../opencores/8b10b/ -I ../../opencores/spi/rtl/verilog/ -I ../../opencores/i2c/rtl/verilog/ -y ../B100 -y $XILINX/verilog/src/unisims E1x0.v  2>&1  | grep -v timescale | grep -v coregen | grep -v models
 
 
diff --git a/usrp2/top/E1x0/timing.ucf b/usrp2/top/E1x0/timing.ucf
index 6bd559426..7d3d9e090 100644
--- a/usrp2/top/E1x0/timing.ucf
+++ b/usrp2/top/E1x0/timing.ucf
@@ -14,7 +14,7 @@ INST "EM_NCS6" TNM = gpmc_net;
 INST "EM_NWE" TNM = gpmc_net;
 INST "EM_NOE" TNM = gpmc_net;
 
-TIMEGRP "gpmc_net" OFFSET = IN 7 ns VALID 14 ns BEFORE "EM_CLK" FALLING;
+TIMEGRP "gpmc_net" OFFSET = IN 6 ns VALID 12 ns BEFORE "EM_CLK" FALLING;
 TIMEGRP "gpmc_net_out" OFFSET = OUT 14 ns AFTER "EM_CLK" RISING; //2 clock cyc per read
 
 #constrain interrupt lines
-- 
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