From e33b2b2bc7fa654c57cb7dfbd74c34d9a23eefee Mon Sep 17 00:00:00 2001
From: Maximilian Rehkopf <ikari@elektra.micecat.ath.cx>
Date: Mon, 9 Jul 2012 01:37:57 +0200
Subject: [PATCH] FPGA: simple SNES address input filtering

---
 verilog/sd2snes/address.v     |  31 ++++---
 verilog/sd2snes/main.ucf      | 144 ++++++++++++++++-----------------
 verilog/sd2snes/main.v        |  37 +++++++--
 verilog/sd2snes/msu.v         |   6 +-
 verilog/sd2snes_cx4/address.v |  10 +--
 verilog/sd2snes_cx4/main.ucf  | 148 +++++++++++++++++-----------------
 verilog/sd2snes_cx4/main.v    |  14 +++-
 verilog/sd2snes_cx4/msu.v     |   2 +-
 verilog/sd2sneslite/main.ucf  | 144 ++++++++++++++++-----------------
 verilog/sd2sneslite/main.v    |  19 +++--
 10 files changed, 296 insertions(+), 259 deletions(-)

diff --git a/verilog/sd2snes/address.v b/verilog/sd2snes/address.v
index 58d9bb7..f8af2bb 100644
--- a/verilog/sd2snes/address.v
+++ b/verilog/sd2snes/address.v
@@ -194,14 +194,19 @@ assign ROM_ADDR = SRAM_SNES_ADDR;
 assign ROM_SEL = 1'b0;
 
 assign msu_enable_w = featurebits[FEAT_MSU1] & (!SNES_ADDR[22] && ((SNES_ADDR[15:0] & 16'hfff8) == 16'h2000));
-reg [5:0] msu_enable_r;
-initial msu_enable_r = 6'b000000;
-always @(posedge CLK) msu_enable_r <= {msu_enable_r[4:0], msu_enable_w};
-assign msu_enable = &msu_enable_r[5:2];
+//reg [5:0] msu_enable_r;
+//initial msu_enable_r = 6'b000000;
+//always @(posedge CLK) msu_enable_r <= {msu_enable_r[4:0], msu_enable_w};
+assign msu_enable = msu_enable_w /*&msu_enable_r[5:2]*/;
 
 assign use_bsx = (MAPPER == 3'b011);
 
-assign srtc_enable = featurebits[FEAT_SRTC] & (!SNES_ADDR[22] && ((SNES_ADDR[15:0] & 16'hfffe) == 16'h2800));
+assign srtc_enable_w = (!SNES_ADDR[22] && ((SNES_ADDR[15:0] & 16'hfffe) == 16'h2800));
+//reg [5:0] srtc_enable_r;
+//initial srtc_enable_r = 6'b000000;
+//always @(posedge CLK) srtc_enable_r <= {srtc_enable_r[4:0], srtc_enable_w};
+assign srtc_enable = srtc_enable_w /*&srtc_enable_r[3:0]*/ & featurebits[FEAT_SRTC];
+
 
 // DSP1 LoROM: DR=30-3f:8000-bfff; SR=30-3f:c000-ffff
 //          or DR=60-6f:0000-3fff; SR=60-6f:4000-7fff
@@ -235,16 +240,16 @@ assign dspx_a0 = featurebits[FEAT_DSPX]
 
 assign dspx_dp_enable = dspx_dp_enable_w;
 
-reg [5:0] dspx_enable_r;
-initial dspx_enable_r = 6'b000000;
-always @(posedge CLK) dspx_enable_r <= {dspx_enable_r[4:0], dspx_enable_w};
-assign dspx_enable = &dspx_enable_r[5:2];
+//reg [5:0] dspx_enable_r;
+//initial dspx_enable_r = 6'b000000;
+//always @(posedge CLK) dspx_enable_r <= {dspx_enable_r[4:0], dspx_enable_w};
+assign dspx_enable = dspx_enable_w /*&dspx_enable_r[5:1]*/;
 
 wire r213f_enable_w = (SNES_PA == 8'h3f);
-reg [5:0] r213f_enable_r;
-initial r213f_enable_r = 6'b000000;
-always @(posedge CLK) r213f_enable_r <= {r213f_enable_r[4:0], r213f_enable_w};
-assign r213f_enable = &r213f_enable_r[5:2] & featurebits[FEAT_213F];
+//reg [5:0] r213f_enable_r;
+//initial r213f_enable_r = 6'b000000;
+//always @(posedge CLK) r213f_enable_r <= {r213f_enable_r[4:0], r213f_enable_w};
+assign r213f_enable = r213f_enable_w /*&r213f_enable_r[5:2]*/ & featurebits[FEAT_213F];
 
 wire snescmd_rd_enable_w = (SNES_PA[7:4] == 4'b1111);
 //reg [5:0] snescmd_rd_enable_r;
diff --git a/verilog/sd2snes/main.ucf b/verilog/sd2snes/main.ucf
index 8aaa266..9b3ac7c 100644
--- a/verilog/sd2snes/main.ucf
+++ b/verilog/sd2snes/main.ucf
@@ -33,30 +33,30 @@ NET "ROM_CE" LOC = P172;
 NET "ROM_CE" IOSTANDARD = LVCMOS33;
 NET "ROM_CE" DRIVE = 8;
 
-NET "SNES_ADDR[0]" LOC = P119;
-NET "SNES_ADDR[10]" LOC = P146;
-NET "SNES_ADDR[11]" LOC = P148;
-NET "SNES_ADDR[12]" LOC = P147;
-NET "SNES_ADDR[13]" LOC = P144;
-NET "SNES_ADDR[14]" LOC = P141;
-NET "SNES_ADDR[15]" LOC = P139;
-NET "SNES_ADDR[16]" LOC = P137;
-NET "SNES_ADDR[17]" LOC = P133;
-NET "SNES_ADDR[18]" LOC = P131;
-NET "SNES_ADDR[19]" LOC = P128;
-NET "SNES_ADDR[1]" LOC = P122;
-NET "SNES_ADDR[20]" LOC = P125;
-NET "SNES_ADDR[21]" LOC = P123;
-NET "SNES_ADDR[22]" LOC = P120;
-NET "SNES_ADDR[23]" LOC = P117;
-NET "SNES_ADDR[2]" LOC = P124;
-NET "SNES_ADDR[3]" LOC = P126;
-NET "SNES_ADDR[4]" LOC = P130;
-NET "SNES_ADDR[5]" LOC = P132;
-NET "SNES_ADDR[6]" LOC = P135;
-NET "SNES_ADDR[7]" LOC = P138;
-NET "SNES_ADDR[8]" LOC = P140;
-NET "SNES_ADDR[9]" LOC = P143;
+NET "SNES_ADDR_IN[0]" LOC = P119;
+NET "SNES_ADDR_IN[10]" LOC = P146;
+NET "SNES_ADDR_IN[11]" LOC = P148;
+NET "SNES_ADDR_IN[12]" LOC = P147;
+NET "SNES_ADDR_IN[13]" LOC = P144;
+NET "SNES_ADDR_IN[14]" LOC = P141;
+NET "SNES_ADDR_IN[15]" LOC = P139;
+NET "SNES_ADDR_IN[16]" LOC = P137;
+NET "SNES_ADDR_IN[17]" LOC = P133;
+NET "SNES_ADDR_IN[18]" LOC = P131;
+NET "SNES_ADDR_IN[19]" LOC = P128;
+NET "SNES_ADDR_IN[1]" LOC = P122;
+NET "SNES_ADDR_IN[20]" LOC = P125;
+NET "SNES_ADDR_IN[21]" LOC = P123;
+NET "SNES_ADDR_IN[22]" LOC = P120;
+NET "SNES_ADDR_IN[23]" LOC = P117;
+NET "SNES_ADDR_IN[2]" LOC = P124;
+NET "SNES_ADDR_IN[3]" LOC = P126;
+NET "SNES_ADDR_IN[4]" LOC = P130;
+NET "SNES_ADDR_IN[5]" LOC = P132;
+NET "SNES_ADDR_IN[6]" LOC = P135;
+NET "SNES_ADDR_IN[7]" LOC = P138;
+NET "SNES_ADDR_IN[8]" LOC = P140;
+NET "SNES_ADDR_IN[9]" LOC = P143;
 NET "SNES_DATA[0]" LOC = P107;
 NET "SNES_DATA[1]" LOC = P102;
 NET "SNES_DATA[2]" LOC = P100;
@@ -379,54 +379,54 @@ NET "ROM_WE" LOC = P190;
 
 NET "ROM_WE" IOSTANDARD = LVCMOS33;
 NET "ROM_WE" DRIVE = 8;
-NET "SNES_ADDR[0]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[0]" DRIVE = 8;
-NET "SNES_ADDR[10]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[10]" DRIVE = 8;
-NET "SNES_ADDR[11]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[11]" DRIVE = 8;
-NET "SNES_ADDR[12]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[12]" DRIVE = 8;
-NET "SNES_ADDR[13]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[13]" DRIVE = 8;
-NET "SNES_ADDR[14]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[14]" DRIVE = 8;
-NET "SNES_ADDR[15]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[15]" DRIVE = 8;
-NET "SNES_ADDR[16]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[16]" DRIVE = 8;
-NET "SNES_ADDR[17]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[17]" DRIVE = 8;
-NET "SNES_ADDR[18]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[18]" DRIVE = 8;
-NET "SNES_ADDR[19]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[19]" DRIVE = 8;
-NET "SNES_ADDR[1]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[1]" DRIVE = 8;
-NET "SNES_ADDR[20]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[20]" DRIVE = 8;
-NET "SNES_ADDR[21]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[21]" DRIVE = 8;
-NET "SNES_ADDR[22]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[22]" DRIVE = 8;
-NET "SNES_ADDR[23]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[23]" DRIVE = 8;
-NET "SNES_ADDR[2]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[2]" DRIVE = 8;
-NET "SNES_ADDR[3]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[3]" DRIVE = 8;
-NET "SNES_ADDR[4]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[4]" DRIVE = 8;
-NET "SNES_ADDR[5]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[5]" DRIVE = 8;
-NET "SNES_ADDR[6]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[6]" DRIVE = 8;
-NET "SNES_ADDR[7]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[7]" DRIVE = 8;
-NET "SNES_ADDR[8]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[8]" DRIVE = 8;
-NET "SNES_ADDR[9]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[9]" DRIVE = 8;
+NET "SNES_ADDR_IN[0]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[0]" DRIVE = 8;
+NET "SNES_ADDR_IN[10]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[10]" DRIVE = 8;
+NET "SNES_ADDR_IN[11]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[11]" DRIVE = 8;
+NET "SNES_ADDR_IN[12]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[12]" DRIVE = 8;
+NET "SNES_ADDR_IN[13]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[13]" DRIVE = 8;
+NET "SNES_ADDR_IN[14]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[14]" DRIVE = 8;
+NET "SNES_ADDR_IN[15]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[15]" DRIVE = 8;
+NET "SNES_ADDR_IN[16]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[16]" DRIVE = 8;
+NET "SNES_ADDR_IN[17]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[17]" DRIVE = 8;
+NET "SNES_ADDR_IN[18]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[18]" DRIVE = 8;
+NET "SNES_ADDR_IN[19]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[19]" DRIVE = 8;
+NET "SNES_ADDR_IN[1]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[1]" DRIVE = 8;
+NET "SNES_ADDR_IN[20]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[20]" DRIVE = 8;
+NET "SNES_ADDR_IN[21]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[21]" DRIVE = 8;
+NET "SNES_ADDR_IN[22]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[22]" DRIVE = 8;
+NET "SNES_ADDR_IN[23]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[23]" DRIVE = 8;
+NET "SNES_ADDR_IN[2]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[2]" DRIVE = 8;
+NET "SNES_ADDR_IN[3]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[3]" DRIVE = 8;
+NET "SNES_ADDR_IN[4]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[4]" DRIVE = 8;
+NET "SNES_ADDR_IN[5]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[5]" DRIVE = 8;
+NET "SNES_ADDR_IN[6]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[6]" DRIVE = 8;
+NET "SNES_ADDR_IN[7]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[7]" DRIVE = 8;
+NET "SNES_ADDR_IN[8]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[8]" DRIVE = 8;
+NET "SNES_ADDR_IN[9]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[9]" DRIVE = 8;
 
 
 NET "SNES_CPU_CLK" LOC = P95;
diff --git a/verilog/sd2snes/main.v b/verilog/sd2snes/main.v
index 1ab88ba..7e7a5fc 100644
--- a/verilog/sd2snes/main.v
+++ b/verilog/sd2snes/main.v
@@ -23,7 +23,7 @@ module main(
   input CLKIN,
 
   /* SNES signals */
-  input [23:0] SNES_ADDR,
+  input [23:0] SNES_ADDR_IN,
   input SNES_READ,
   input SNES_WRITE,
   input SNES_CS,
@@ -76,6 +76,17 @@ module main(
   /* debug */
   output p113_out
 );
+
+wire CLK2;
+
+reg [23:0] SNES_ADDR_r [2:0];
+always @(posedge CLK2) begin
+  SNES_ADDR_r[2] <= SNES_ADDR_r[1];
+  SNES_ADDR_r[1] <= SNES_ADDR_r[0];
+  SNES_ADDR_r[0] <= SNES_ADDR_IN;
+end
+wire [23:0] SNES_ADDR = SNES_ADDR_r[2] & SNES_ADDR_r[1];
+
 wire dspx_dp_enable;
 
 wire [7:0] spi_cmd_data;
@@ -639,28 +650,38 @@ always @(posedge CLK2) begin
   end
 end
 
+reg ROM_WE_1;
+reg MCU_WRITE_1;
+
+always @(posedge CLK2) begin
+  ROM_WE_1 <= ROM_WE;
+  MCU_WRITE_1<= MCU_WRITE;
+end
+
 assign ROM_DATA[7:0] = ROM_ADDR0
-                       ?(SD_DMA_TO_ROM ? (!MCU_WRITE ? MCU_DOUT : 8'bZ)
-                                        : (!ROM_WE ? ROM_DOUTr : 8'bZ)
+                       ?(SD_DMA_TO_ROM ? (!MCU_WRITE_1 ? MCU_DOUT : 8'bZ)
+							                   /*: ((~SNES_WRITE & (IS_WRITABLE | IS_FLASHWR)) ? SNES_DATA */
+                                        : (ROM_DOUT_ENr ? ROM_DOUTr : 8'bZ) //)
                         )
                        :8'bZ;
 
 assign ROM_DATA[15:8] = ROM_ADDR0 ? 8'bZ
-                        :(SD_DMA_TO_ROM ? (!MCU_WRITE ? MCU_DOUT : 8'bZ)
-                                         : (!ROM_WE ? ROM_DOUTr : 8'bZ)
+                        :(SD_DMA_TO_ROM ? (!MCU_WRITE_1 ? MCU_DOUT : 8'bZ)
+								                 /*:  ((~SNES_WRITE & (IS_WRITABLE | IS_FLASHWR)) ? SNES_DATA */
+                                         : (ROM_DOUT_ENr ? ROM_DOUTr : 8'bZ) //)
                          );
 
 assign ROM_WE = SD_DMA_TO_ROM
                 ?MCU_WRITE
-                :ROM_WEr | (ASSERT_SNES_ADDR & ~snes_wr_cycle);
+                :/*(SNES_FAKE_CLK & (IS_WRITABLE | IS_FLASHWR)) ? SNES_WRITE :*/ ROM_WEr;
 
 // OE always active. Overridden by WE when needed.
 assign ROM_OE = 1'b0;
 
 assign ROM_CE = 1'b0;
 
-assign ROM_BHE = !ROM_WE ? ROM_ADDR0 : 1'b0;
-assign ROM_BLE = !ROM_WE ? !ROM_ADDR0 : 1'b0;
+assign ROM_BHE = /*(~SD_DMA_TO_ROM & ~ROM_WE & ~ROM_SA) ?*/ ROM_ADDR0 /*: 1'b0*/;
+assign ROM_BLE = /*(~SD_DMA_TO_ROM & ~ROM_WE & ~ROM_SA) ?*/ !ROM_ADDR0 /*: 1'b0*/;
 
 assign SNES_DATABUS_OE = (dspx_enable | dspx_dp_enable) ? 1'b0 :
                          msu_enable ? 1'b0 :
diff --git a/verilog/sd2snes/msu.v b/verilog/sd2snes/msu.v
index 32b106a..213d285 100644
--- a/verilog/sd2snes/msu.v
+++ b/verilog/sd2snes/msu.v
@@ -124,8 +124,8 @@ reg [7:0] data_out_r;
 assign reg_data_out = data_out_r;
 
 always @(posedge clkin) begin
-  case(reg_addr_r[3])
-    3'h0: data_out_r <= {data_busy_r, audio_busy_r, audio_status_r, 4'b0001};
+  case(reg_addr_r[1])
+    3'h0: data_out_r <= {data_busy_r, audio_busy_r, audio_status_r, audio_error_r, 3'b001};
     3'h1: data_out_r <= msu_data;
     3'h2: data_out_r <= 8'h53;
     3'h3: data_out_r <= 8'h2d;
@@ -138,7 +138,7 @@ end
 
 always @(posedge clkin) begin
   if(reg_we_rising) begin
-    case(reg_addr_r[3])
+    case(reg_addr_r[1])
       3'h0: addr_out_r[7:0] <= reg_data_in;
       3'h1: addr_out_r[15:8] <= reg_data_in;
       3'h2: addr_out_r[23:16] <= reg_data_in;
diff --git a/verilog/sd2snes_cx4/address.v b/verilog/sd2snes_cx4/address.v
index dd9331e..1e3a823 100644
--- a/verilog/sd2snes_cx4/address.v
+++ b/verilog/sd2snes_cx4/address.v
@@ -56,16 +56,10 @@ assign ROM_ADDR = SRAM_SNES_ADDR;
 assign ROM_SEL = 1'b0;
 
 wire msu_enable_w = use_msu1 & (!SNES_ADDR[22] && ((SNES_ADDR[15:0] & 16'hfff8) == 16'h2000));
-reg [5:0] msu_enable_r;
-initial msu_enable_r = 6'b000000;
-always @(posedge CLK) msu_enable_r <= {msu_enable_r[4:0], msu_enable_w};
-assign msu_enable = &msu_enable_r[5:2];
+assign msu_enable = msu_enable_w;
 
 wire cx4_enable_w = (!SNES_ADDR[22] && (SNES_ADDR[15:13] == 3'b011));
-reg [5:0] cx4_enable_r;
-initial cx4_enable_r = 6'b000000;
-always @(posedge CLK) cx4_enable_r <= {cx4_enable_r[4:0], cx4_enable_w};
-assign cx4_enable = &cx4_enable_r[5:2];
+assign cx4_enable = cx4_enable_w;
 
 assign cx4_vect_enable = &SNES_ADDR[15:5];
 
diff --git a/verilog/sd2snes_cx4/main.ucf b/verilog/sd2snes_cx4/main.ucf
index 0a2a7e4..d764a86 100644
--- a/verilog/sd2snes_cx4/main.ucf
+++ b/verilog/sd2snes_cx4/main.ucf
@@ -35,30 +35,30 @@ NET "ROM_CE" LOC = P172;
 NET "ROM_CE" IOSTANDARD = LVCMOS33;
 NET "ROM_CE" DRIVE = 8;
 
-NET "SNES_ADDR[0]" LOC = P119;
-NET "SNES_ADDR[10]" LOC = P146;
-NET "SNES_ADDR[11]" LOC = P148;
-NET "SNES_ADDR[12]" LOC = P147;
-NET "SNES_ADDR[13]" LOC = P144;
-NET "SNES_ADDR[14]" LOC = P141;
-NET "SNES_ADDR[15]" LOC = P139;
-NET "SNES_ADDR[16]" LOC = P137;
-NET "SNES_ADDR[17]" LOC = P133;
-NET "SNES_ADDR[18]" LOC = P131;
-NET "SNES_ADDR[19]" LOC = P128;
-NET "SNES_ADDR[1]" LOC = P122;
-NET "SNES_ADDR[20]" LOC = P125;
-NET "SNES_ADDR[21]" LOC = P123;
-NET "SNES_ADDR[22]" LOC = P120;
-NET "SNES_ADDR[23]" LOC = P117;
-NET "SNES_ADDR[2]" LOC = P124;
-NET "SNES_ADDR[3]" LOC = P126;
-NET "SNES_ADDR[4]" LOC = P130;
-NET "SNES_ADDR[5]" LOC = P132;
-NET "SNES_ADDR[6]" LOC = P135;
-NET "SNES_ADDR[7]" LOC = P138;
-NET "SNES_ADDR[8]" LOC = P140;
-NET "SNES_ADDR[9]" LOC = P143;
+NET "SNES_ADDR_IN[0]" LOC = P119;
+NET "SNES_ADDR_IN[10]" LOC = P146;
+NET "SNES_ADDR_IN[11]" LOC = P148;
+NET "SNES_ADDR_IN[12]" LOC = P147;
+NET "SNES_ADDR_IN[13]" LOC = P144;
+NET "SNES_ADDR_IN[14]" LOC = P141;
+NET "SNES_ADDR_IN[15]" LOC = P139;
+NET "SNES_ADDR_IN[16]" LOC = P137;
+NET "SNES_ADDR_IN[17]" LOC = P133;
+NET "SNES_ADDR_IN[18]" LOC = P131;
+NET "SNES_ADDR_IN[19]" LOC = P128;
+NET "SNES_ADDR_IN[1]" LOC = P122;
+NET "SNES_ADDR_IN[20]" LOC = P125;
+NET "SNES_ADDR_IN[21]" LOC = P123;
+NET "SNES_ADDR_IN[22]" LOC = P120;
+NET "SNES_ADDR_IN[23]" LOC = P117;
+NET "SNES_ADDR_IN[2]" LOC = P124;
+NET "SNES_ADDR_IN[3]" LOC = P126;
+NET "SNES_ADDR_IN[4]" LOC = P130;
+NET "SNES_ADDR_IN[5]" LOC = P132;
+NET "SNES_ADDR_IN[6]" LOC = P135;
+NET "SNES_ADDR_IN[7]" LOC = P138;
+NET "SNES_ADDR_IN[8]" LOC = P140;
+NET "SNES_ADDR_IN[9]" LOC = P143;
 NET "SNES_DATA[0]" LOC = P107;
 NET "SNES_DATA[1]" LOC = P102;
 NET "SNES_DATA[2]" LOC = P100;
@@ -381,54 +381,54 @@ NET "ROM_WE" LOC = P190;
 
 NET "ROM_WE" IOSTANDARD = LVCMOS33;
 NET "ROM_WE" DRIVE = 8;
-NET "SNES_ADDR[0]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[0]" DRIVE = 8;
-NET "SNES_ADDR[10]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[10]" DRIVE = 8;
-NET "SNES_ADDR[11]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[11]" DRIVE = 8;
-NET "SNES_ADDR[12]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[12]" DRIVE = 8;
-NET "SNES_ADDR[13]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[13]" DRIVE = 8;
-NET "SNES_ADDR[14]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[14]" DRIVE = 8;
-NET "SNES_ADDR[15]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[15]" DRIVE = 8;
-NET "SNES_ADDR[16]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[16]" DRIVE = 8;
-NET "SNES_ADDR[17]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[17]" DRIVE = 8;
-NET "SNES_ADDR[18]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[18]" DRIVE = 8;
-NET "SNES_ADDR[19]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[19]" DRIVE = 8;
-NET "SNES_ADDR[1]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[1]" DRIVE = 8;
-NET "SNES_ADDR[20]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[20]" DRIVE = 8;
-NET "SNES_ADDR[21]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[21]" DRIVE = 8;
-NET "SNES_ADDR[22]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[22]" DRIVE = 8;
-NET "SNES_ADDR[23]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[23]" DRIVE = 8;
-NET "SNES_ADDR[2]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[2]" DRIVE = 8;
-NET "SNES_ADDR[3]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[3]" DRIVE = 8;
-NET "SNES_ADDR[4]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[4]" DRIVE = 8;
-NET "SNES_ADDR[5]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[5]" DRIVE = 8;
-NET "SNES_ADDR[6]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[6]" DRIVE = 8;
-NET "SNES_ADDR[7]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[7]" DRIVE = 8;
-NET "SNES_ADDR[8]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[8]" DRIVE = 8;
-NET "SNES_ADDR[9]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[9]" DRIVE = 8;
+NET "SNES_ADDR_IN[0]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[0]" DRIVE = 8;
+NET "SNES_ADDR_IN[10]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[10]" DRIVE = 8;
+NET "SNES_ADDR_IN[11]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[11]" DRIVE = 8;
+NET "SNES_ADDR_IN[12]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[12]" DRIVE = 8;
+NET "SNES_ADDR_IN[13]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[13]" DRIVE = 8;
+NET "SNES_ADDR_IN[14]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[14]" DRIVE = 8;
+NET "SNES_ADDR_IN[15]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[15]" DRIVE = 8;
+NET "SNES_ADDR_IN[16]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[16]" DRIVE = 8;
+NET "SNES_ADDR_IN[17]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[17]" DRIVE = 8;
+NET "SNES_ADDR_IN[18]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[18]" DRIVE = 8;
+NET "SNES_ADDR_IN[19]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[19]" DRIVE = 8;
+NET "SNES_ADDR_IN[1]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[1]" DRIVE = 8;
+NET "SNES_ADDR_IN[20]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[20]" DRIVE = 8;
+NET "SNES_ADDR_IN[21]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[21]" DRIVE = 8;
+NET "SNES_ADDR_IN[22]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[22]" DRIVE = 8;
+NET "SNES_ADDR_IN[23]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[23]" DRIVE = 8;
+NET "SNES_ADDR_IN[2]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[2]" DRIVE = 8;
+NET "SNES_ADDR_IN[3]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[3]" DRIVE = 8;
+NET "SNES_ADDR_IN[4]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[4]" DRIVE = 8;
+NET "SNES_ADDR_IN[5]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[5]" DRIVE = 8;
+NET "SNES_ADDR_IN[6]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[6]" DRIVE = 8;
+NET "SNES_ADDR_IN[7]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[7]" DRIVE = 8;
+NET "SNES_ADDR_IN[8]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[8]" DRIVE = 8;
+NET "SNES_ADDR_IN[9]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[9]" DRIVE = 8;
 
 
 NET "SNES_CPU_CLK" LOC = P95;
@@ -546,8 +546,8 @@ NET "SNES_SYSCLK" LOC = P180;
 NET "SNES_SYSCLK" IOSTANDARD = LVCMOS33;
 #Created by Constraints Editor (xc3s400-pq208-4) - 2011/10/28
 TIMEGRP "msu_track_out_r" = FFS("snes_msu/track_out_r<0>") FFS("snes_msu/track_out_r<1>") FFS("snes_msu/track_out_r<2>") FFS("snes_msu/track_out_r<3>") FFS("snes_msu/track_out_r<4>") FFS("snes_msu/track_out_r<5>") FFS("snes_msu/track_out_r<6>") FFS("snes_msu/track_out_r<7>") FFS("snes_msu/track_out_r<8>") FFS("snes_msu/track_out_r<9>") FFS("snes_msu/track_out_r<10>") FFS("snes_msu/track_out_r<11>") FFS("snes_msu/track_out_r<12>") FFS("snes_msu/track_out_r<13>") FFS("snes_msu/track_out_r<14>") FFS("snes_msu/track_out_r<15>");
-TIMEGRP "msu_addr_r" = FFS("snes_msu/addr_out_r<0>") FFS("snes_msu/addr_out_r<1>") FFS("snes_msu/addr_out_r<2>") FFS("snes_msu/addr_out_r<3>") FFS("snes_msu/addr_out_r<4>") FFS("snes_msu/addr_out_r<5>") FFS("snes_msu/addr_out_r<6>") FFS("snes_msu/addr_out_r<7>") FFS("snes_msu/addr_out_r<8>") FFS("snes_msu/addr_out_r<9>") FFS("snes_msu/addr_out_r<10>") FFS("snes_msu/addr_out_r<11>") FFS("snes_msu/addr_out_r<12>") FFS("snes_msu/addr_out_r<13>") FFS("snes_msu/addr_out_r<14>") FFS("snes_msu/addr_out_r<15>") FFS("snes_msu/addr_out_r<16>") FFS("snes_msu/addr_out_r<17>") FFS("snes_msu/addr_out_r<18>") FFS("snes_msu/addr_out_r<19>") FFS("snes_msu/addr_out_r<20>") FFS("snes_msu/addr_out_r<21>") FFS("snes_msu/addr_out_r<22>") FFS("snes_msu/addr_out_r<23>") FFS("snes_msu/addr_out_r<24>") FFS("snes_msu/addr_out_r<25>") FFS("snes_msu/addr_out_r<26>") FFS("snes_msu/addr_out_r<27>") FFS("snes_msu/addr_out_r<28>") FFS("snes_msu/addr_out_r<29>") FFS("snes_msu/addr_out_r<30>") FFS("snes_msu/addr_out_r<31>");
-TIMEGRP "mcu_cmd_msu_addr_out" = FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<0>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<1>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<2>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<3>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<4>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<5>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<6>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<7>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<8>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<9>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<10>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<11>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<12>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<13>");
+# TIMEGRP "msu_addr_r" = FFS("snes_msu/addr_out_r<0>") FFS("snes_msu/addr_out_r<1>") FFS("snes_msu/addr_out_r<2>") FFS("snes_msu/addr_out_r<3>") FFS("snes_msu/addr_out_r<4>") FFS("snes_msu/addr_out_r<5>") FFS("snes_msu/addr_out_r<6>") FFS("snes_msu/addr_out_r<7>") FFS("snes_msu/addr_out_r<8>") FFS("snes_msu/addr_out_r<9>") FFS("snes_msu/addr_out_r<10>") FFS("snes_msu/addr_out_r<11>") FFS("snes_msu/addr_out_r<12>") FFS("snes_msu/addr_out_r<13>") FFS("snes_msu/addr_out_r<14>") FFS("snes_msu/addr_out_r<15>") FFS("snes_msu/addr_out_r<16>") FFS("snes_msu/addr_out_r<17>") FFS("snes_msu/addr_out_r<18>") FFS("snes_msu/addr_out_r<19>") FFS("snes_msu/addr_out_r<20>") FFS("snes_msu/addr_out_r<21>") FFS("snes_msu/addr_out_r<22>") FFS("snes_msu/addr_out_r<23>") FFS("snes_msu/addr_out_r<24>") FFS("snes_msu/addr_out_r<25>") FFS("snes_msu/addr_out_r<26>") FFS("snes_msu/addr_out_r<27>") FFS("snes_msu/addr_out_r<28>") FFS("snes_msu/addr_out_r<29>") FFS("snes_msu/addr_out_r<30>") FFS("snes_msu/addr_out_r<31>");
+# TIMEGRP "mcu_cmd_msu_addr_out" = FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<0>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<1>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<2>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<3>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<4>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<5>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<6>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<7>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<8>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<9>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<10>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<11>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<12>") FFS("snes_mcu_cmd/MSU_ADDR_OUT_BUF<13>");
 TIMEGRP "cx4_cache_src_addr" = FFS("snes_cx4/CACHE_SRC_ADDRr<0>") FFS("snes_cx4/CACHE_SRC_ADDRr<1>") FFS("snes_cx4/CACHE_SRC_ADDRr<2>") FFS("snes_cx4/CACHE_SRC_ADDRr<3>") FFS("snes_cx4/CACHE_SRC_ADDRr<4>") FFS("snes_cx4/CACHE_SRC_ADDRr<5>") FFS("snes_cx4/CACHE_SRC_ADDRr<6>") FFS("snes_cx4/CACHE_SRC_ADDRr<7>") FFS("snes_cx4/CACHE_SRC_ADDRr<8>") FFS("snes_cx4/CACHE_SRC_ADDRr<9>") FFS("snes_cx4/CACHE_SRC_ADDRr<10>") FFS("snes_cx4/CACHE_SRC_ADDRr<11>") FFS("snes_cx4/CACHE_SRC_ADDRr<12>") FFS("snes_cx4/CACHE_SRC_ADDRr<13>") FFS("snes_cx4/CACHE_SRC_ADDRr<14>") FFS("snes_cx4/CACHE_SRC_ADDRr<15>") FFS("snes_cx4/CACHE_SRC_ADDRr<16>") FFS("snes_cx4/CACHE_SRC_ADDRr<17>") FFS("snes_cx4/CACHE_SRC_ADDRr<18>") FFS("snes_cx4/CACHE_SRC_ADDRr<19>") FFS("snes_cx4/CACHE_SRC_ADDRr<20>") FFS("snes_cx4/CACHE_SRC_ADDRr<21>") FFS("snes_cx4/CACHE_SRC_ADDRr<22>") FFS("snes_cx4/CACHE_SRC_ADDRr<23>");
 TIMEGRP "cx4_cpu_busaddr" = FFS("snes_cx4/cpu_busaddr<0>") FFS("snes_cx4/cpu_busaddr<1>") FFS("snes_cx4/cpu_busaddr<2>") FFS("snes_cx4/cpu_busaddr<3>") FFS("snes_cx4/cpu_busaddr<4>") FFS("snes_cx4/cpu_busaddr<5>") FFS("snes_cx4/cpu_busaddr<6>") FFS("snes_cx4/cpu_busaddr<7>") FFS("snes_cx4/cpu_busaddr<8>") FFS("snes_cx4/cpu_busaddr<9>") FFS("snes_cx4/cpu_busaddr<10>") FFS("snes_cx4/cpu_busaddr<11>") FFS("snes_cx4/cpu_busaddr<12>") FFS("snes_cx4/cpu_busaddr<13>") FFS("snes_cx4/cpu_busaddr<14>") FFS("snes_cx4/cpu_busaddr<15>") FFS("snes_cx4/cpu_busaddr<16>") FFS("snes_cx4/cpu_busaddr<17>") FFS("snes_cx4/cpu_busaddr<18>") FFS("snes_cx4/cpu_busaddr<19>") FFS("snes_cx4/cpu_busaddr<20>") FFS("snes_cx4/cpu_busaddr<21>") FFS("snes_cx4/cpu_busaddr<22>") FFS("snes_cx4/cpu_busaddr<23>");
 TIMEGRP "cx4_cpu_ramaddr" = FFS("snes_cx4/cpu_ramaddr<0>") FFS("snes_cx4/cpu_ramaddr<1>") FFS("snes_cx4/cpu_ramaddr<2>") FFS("snes_cx4/cpu_ramaddr<3>") FFS("snes_cx4/cpu_ramaddr<4>") FFS("snes_cx4/cpu_ramaddr<5>") FFS("snes_cx4/cpu_ramaddr<6>") FFS("snes_cx4/cpu_ramaddr<7>") FFS("snes_cx4/cpu_ramaddr<8>") FFS("snes_cx4/cpu_ramaddr<9>") FFS("snes_cx4/cpu_ramaddr<10>") FFS("snes_cx4/cpu_ramaddr<11>") FFS("snes_cx4/cpu_ramaddr<12>") FFS("snes_cx4/cpu_ramaddr<13>") FFS("snes_cx4/cpu_ramaddr<14>") FFS("snes_cx4/cpu_ramaddr<15>") FFS("snes_cx4/cpu_ramaddr<16>") FFS("snes_cx4/cpu_ramaddr<17>") FFS("snes_cx4/cpu_ramaddr<18>") FFS("snes_cx4/cpu_ramaddr<19>") FFS("snes_cx4/cpu_ramaddr<20>") FFS("snes_cx4/cpu_ramaddr<21>") FFS("snes_cx4/cpu_ramaddr<22>") FFS("snes_cx4/cpu_ramaddr<23>");
diff --git a/verilog/sd2snes_cx4/main.v b/verilog/sd2snes_cx4/main.v
index fd97aa6..283293c 100644
--- a/verilog/sd2snes_cx4/main.v
+++ b/verilog/sd2snes_cx4/main.v
@@ -23,7 +23,7 @@ module main(
   input CLKIN,
 
   /* SNES signals */
-  input [23:0] SNES_ADDR,
+  input [23:0] SNES_ADDR_IN,
   input SNES_READ,
   input SNES_WRITE,
   input SNES_CS,
@@ -38,7 +38,7 @@ module main(
   input [7:0] SNES_PA,
   input SNES_PARD,
   input SNES_PAWR,
-
+  
   /* SRAM signals */
   /* Bus 1: PSRAM, 128Mbit, 16bit, 70ns */
   inout [15:0] ROM_DATA,
@@ -77,6 +77,16 @@ module main(
   output p113_out
 );
 
+wire CLK2;
+
+reg [23:0] SNES_ADDR_r [2:0];
+always @(posedge CLK2) begin
+  SNES_ADDR_r[2] <= SNES_ADDR_r[1];
+  SNES_ADDR_r[1] <= SNES_ADDR_r[0];
+  SNES_ADDR_r[0] <= SNES_ADDR_IN;
+end
+wire [23:0] SNES_ADDR = SNES_ADDR_r[2] & SNES_ADDR_r[1];
+
 wire [7:0] spi_cmd_data;
 wire [7:0] spi_param_data;
 wire [7:0] spi_input_data;
diff --git a/verilog/sd2snes_cx4/msu.v b/verilog/sd2snes_cx4/msu.v
index 32b106a..2cf3711 100644
--- a/verilog/sd2snes_cx4/msu.v
+++ b/verilog/sd2snes_cx4/msu.v
@@ -138,7 +138,7 @@ end
 
 always @(posedge clkin) begin
   if(reg_we_rising) begin
-    case(reg_addr_r[3])
+    case(reg_addr_r[1])
       3'h0: addr_out_r[7:0] <= reg_data_in;
       3'h1: addr_out_r[15:8] <= reg_data_in;
       3'h2: addr_out_r[23:16] <= reg_data_in;
diff --git a/verilog/sd2sneslite/main.ucf b/verilog/sd2sneslite/main.ucf
index 284bcc8..3ccab02 100644
--- a/verilog/sd2sneslite/main.ucf
+++ b/verilog/sd2sneslite/main.ucf
@@ -34,30 +34,30 @@ NET "ROM_CE" LOC = P172;
 NET "ROM_CE" IOSTANDARD = LVCMOS33;
 NET "ROM_CE" DRIVE = 8;
 
-NET "SNES_ADDR[0]" LOC = P119;
-NET "SNES_ADDR[10]" LOC = P146;
-NET "SNES_ADDR[11]" LOC = P148;
-NET "SNES_ADDR[12]" LOC = P147;
-NET "SNES_ADDR[13]" LOC = P144;
-NET "SNES_ADDR[14]" LOC = P141;
-NET "SNES_ADDR[15]" LOC = P139;
-NET "SNES_ADDR[16]" LOC = P137;
-NET "SNES_ADDR[17]" LOC = P133;
-NET "SNES_ADDR[18]" LOC = P131;
-NET "SNES_ADDR[19]" LOC = P128;
-NET "SNES_ADDR[1]" LOC = P122;
-NET "SNES_ADDR[20]" LOC = P125;
-NET "SNES_ADDR[21]" LOC = P123;
-NET "SNES_ADDR[22]" LOC = P120;
-NET "SNES_ADDR[23]" LOC = P117;
-NET "SNES_ADDR[2]" LOC = P124;
-NET "SNES_ADDR[3]" LOC = P126;
-NET "SNES_ADDR[4]" LOC = P130;
-NET "SNES_ADDR[5]" LOC = P132;
-NET "SNES_ADDR[6]" LOC = P135;
-NET "SNES_ADDR[7]" LOC = P138;
-NET "SNES_ADDR[8]" LOC = P140;
-NET "SNES_ADDR[9]" LOC = P143;
+NET "SNES_ADDR_IN[0]" LOC = P119;
+NET "SNES_ADDR_IN[10]" LOC = P146;
+NET "SNES_ADDR_IN[11]" LOC = P148;
+NET "SNES_ADDR_IN[12]" LOC = P147;
+NET "SNES_ADDR_IN[13]" LOC = P144;
+NET "SNES_ADDR_IN[14]" LOC = P141;
+NET "SNES_ADDR_IN[15]" LOC = P139;
+NET "SNES_ADDR_IN[16]" LOC = P137;
+NET "SNES_ADDR_IN[17]" LOC = P133;
+NET "SNES_ADDR_IN[18]" LOC = P131;
+NET "SNES_ADDR_IN[19]" LOC = P128;
+NET "SNES_ADDR_IN[1]" LOC = P122;
+NET "SNES_ADDR_IN[20]" LOC = P125;
+NET "SNES_ADDR_IN[21]" LOC = P123;
+NET "SNES_ADDR_IN[22]" LOC = P120;
+NET "SNES_ADDR_IN[23]" LOC = P117;
+NET "SNES_ADDR_IN[2]" LOC = P124;
+NET "SNES_ADDR_IN[3]" LOC = P126;
+NET "SNES_ADDR_IN[4]" LOC = P130;
+NET "SNES_ADDR_IN[5]" LOC = P132;
+NET "SNES_ADDR_IN[6]" LOC = P135;
+NET "SNES_ADDR_IN[7]" LOC = P138;
+NET "SNES_ADDR_IN[8]" LOC = P140;
+NET "SNES_ADDR_IN[9]" LOC = P143;
 NET "SNES_DATA[0]" LOC = P107;
 NET "SNES_DATA[1]" LOC = P102;
 NET "SNES_DATA[2]" LOC = P100;
@@ -380,54 +380,54 @@ NET "ROM_WE" LOC = P190;
 
 NET "ROM_WE" IOSTANDARD = LVCMOS33;
 NET "ROM_WE" DRIVE = 8;
-NET "SNES_ADDR[0]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[0]" DRIVE = 8;
-NET "SNES_ADDR[10]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[10]" DRIVE = 8;
-NET "SNES_ADDR[11]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[11]" DRIVE = 8;
-NET "SNES_ADDR[12]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[12]" DRIVE = 8;
-NET "SNES_ADDR[13]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[13]" DRIVE = 8;
-NET "SNES_ADDR[14]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[14]" DRIVE = 8;
-NET "SNES_ADDR[15]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[15]" DRIVE = 8;
-NET "SNES_ADDR[16]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[16]" DRIVE = 8;
-NET "SNES_ADDR[17]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[17]" DRIVE = 8;
-NET "SNES_ADDR[18]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[18]" DRIVE = 8;
-NET "SNES_ADDR[19]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[19]" DRIVE = 8;
-NET "SNES_ADDR[1]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[1]" DRIVE = 8;
-NET "SNES_ADDR[20]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[20]" DRIVE = 8;
-NET "SNES_ADDR[21]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[21]" DRIVE = 8;
-NET "SNES_ADDR[22]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[22]" DRIVE = 8;
-NET "SNES_ADDR[23]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[23]" DRIVE = 8;
-NET "SNES_ADDR[2]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[2]" DRIVE = 8;
-NET "SNES_ADDR[3]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[3]" DRIVE = 8;
-NET "SNES_ADDR[4]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[4]" DRIVE = 8;
-NET "SNES_ADDR[5]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[5]" DRIVE = 8;
-NET "SNES_ADDR[6]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[6]" DRIVE = 8;
-NET "SNES_ADDR[7]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[7]" DRIVE = 8;
-NET "SNES_ADDR[8]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[8]" DRIVE = 8;
-NET "SNES_ADDR[9]" IOSTANDARD = LVCMOS33;
-NET "SNES_ADDR[9]" DRIVE = 8;
+NET "SNES_ADDR_IN[0]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[0]" DRIVE = 8;
+NET "SNES_ADDR_IN[10]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[10]" DRIVE = 8;
+NET "SNES_ADDR_IN[11]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[11]" DRIVE = 8;
+NET "SNES_ADDR_IN[12]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[12]" DRIVE = 8;
+NET "SNES_ADDR_IN[13]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[13]" DRIVE = 8;
+NET "SNES_ADDR_IN[14]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[14]" DRIVE = 8;
+NET "SNES_ADDR_IN[15]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[15]" DRIVE = 8;
+NET "SNES_ADDR_IN[16]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[16]" DRIVE = 8;
+NET "SNES_ADDR_IN[17]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[17]" DRIVE = 8;
+NET "SNES_ADDR_IN[18]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[18]" DRIVE = 8;
+NET "SNES_ADDR_IN[19]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[19]" DRIVE = 8;
+NET "SNES_ADDR_IN[1]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[1]" DRIVE = 8;
+NET "SNES_ADDR_IN[20]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[20]" DRIVE = 8;
+NET "SNES_ADDR_IN[21]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[21]" DRIVE = 8;
+NET "SNES_ADDR_IN[22]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[22]" DRIVE = 8;
+NET "SNES_ADDR_IN[23]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[23]" DRIVE = 8;
+NET "SNES_ADDR_IN[2]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[2]" DRIVE = 8;
+NET "SNES_ADDR_IN[3]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[3]" DRIVE = 8;
+NET "SNES_ADDR_IN[4]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[4]" DRIVE = 8;
+NET "SNES_ADDR_IN[5]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[5]" DRIVE = 8;
+NET "SNES_ADDR_IN[6]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[6]" DRIVE = 8;
+NET "SNES_ADDR_IN[7]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[7]" DRIVE = 8;
+NET "SNES_ADDR_IN[8]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[8]" DRIVE = 8;
+NET "SNES_ADDR_IN[9]" IOSTANDARD = LVCMOS33;
+NET "SNES_ADDR_IN[9]" DRIVE = 8;
 
 
 NET "SNES_CPU_CLK" LOC = P95;
diff --git a/verilog/sd2sneslite/main.v b/verilog/sd2sneslite/main.v
index 0e2dbf7..5b08d75 100644
--- a/verilog/sd2sneslite/main.v
+++ b/verilog/sd2sneslite/main.v
@@ -23,7 +23,7 @@ module main(
   input CLKIN,
 
   /* SNES signals */
-  input [23:0] SNES_ADDR,
+  input [23:0] SNES_ADDR_IN,
   input SNES_READ,
   input SNES_WRITE,
   input SNES_CS,
@@ -73,12 +73,19 @@ module main(
   output p113_out
 );
 
-assign DAC_MCLK = 1'b0;
-assign DAC_LRCK = 1'b0;
-assign DAC_SDOUT = 1'b0;
+assign DAC_MCLK = 0;
+assign DAC_LRCK = 0;
+assign DAC_SDOUT = 0;
 
-assign SD_CMD = 1'bZ;
-assign SD_CLK = 1'bZ;
+wire CLK2;
+
+reg [23:0] SNES_ADDR_r [2:0];
+always @(posedge CLK2) begin
+  SNES_ADDR_r[2] <= SNES_ADDR_r[1];
+  SNES_ADDR_r[1] <= SNES_ADDR_r[0];
+  SNES_ADDR_r[0] <= SNES_ADDR_IN;
+end
+wire [23:0] SNES_ADDR = SNES_ADDR_r[2] & SNES_ADDR_r[1];
 
 wire [7:0] spi_cmd_data;
 wire [7:0] spi_param_data;