first cut at blinking leds

4 files changed, 237 insertions, 345 deletions

diff --git a/usrp2/top/safe_u1e/.gitignore b/usrp2/top/safe_u1e/.gitignore
new file mode 100644
index 000000000..bdc5af040
--- /dev/null
+++ b/usrp2/top/safe_u1e/.gitignore
@@ -0,0 +1,2 @@
+*~
+build
diff --git a/usrp2/top/safe_u1e/Makefile b/usrp2/top/safe_u1e/Makefile
index 8fe77d554..664835187 100644
--- a/usrp2/top/safe_u1e/Makefile
+++ b/usrp2/top/safe_u1e/Makefile
@@ -175,7 +175,7 @@ timing/time_sender.v \
 timing/time_sync.v \
 timing/timer.v \
 top/u2_core/u2_core.v \
-top/safe_u1e/u1e.ucf \
+top/safe_u1e/safe_u1e.ucf \
 top/safe_u1e/safe_u1e.v 
 
 ##################################################
diff --git a/usrp2/top/safe_u1e/safe_u1e.ucf b/usrp2/top/safe_u1e/safe_u1e.ucf
new file mode 100644
index 000000000..83dbeca54
--- /dev/null
+++ b/usrp2/top/safe_u1e/safe_u1e.ucf
@@ -0,0 +1,228 @@
+#NET "EM_CLK"  LOC = "F11"  ;
+#NET "overo_gpio23"  LOC = "B3"  ;
+#NET "overo_gpio22"  LOC = "A3"  ;
+#NET "overo_gpio21"  LOC = "D5"  ;
+#NET "overo_gpio14"  LOC = "C4"  ;
+#NET "overo_gpio176"  LOC = "B4"  ;
+#NET "overo_gpio64"  LOC = "A4"  ;
+#NET "overo_gpio65"  LOC = "F8"  ;
+#NET "overo_gpio170"  LOC = "E8"  ;
+#NET "overo_gpio145"  LOC = "C7"  ;
+#NET "overo_gpio163"  LOC = "D7"  ;
+#NET "overo_gpio146"  LOC = "A6"  ;
+#NET "overo_gpio144"  LOC = "A5"  ;
+#NET "overo_gpio147"  LOC = "B6"  ;
+#NET "overo_gpio128"  LOC = "G8"  ;
+#NET "overo_gpio0"  LOC = "F9"  ;
+#NET "overo_gpio127"  LOC = "C8"  ;
+#NET "overo_txd1"  LOC = "C6"  ;
+#NET "overo_rxd1"  LOC = "D6"  ;
+#NET "EM_WAIT0"  LOC = "F14"  ;
+#NET "EM_NWP"  LOC = "F13"  ;
+#NET "EM_NBE1"  LOC = "D14"  ;
+#NET "EM_NBE0"  LOC = "A13"  ;
+#NET "EM_NWE"  LOC = "B13"  ;
+#NET "EM_NOE"  LOC = "A14"  ;
+#NET "EM_NADV_ALE"  LOC = "B15"  ;
+#NET "EM_D15"  LOC = "D13"  ;
+#NET "EM_D14"  LOC = "D15"  ;
+#NET "EM_D13"  LOC = "C16"  ;
+#NET "EM_D12"  LOC = "B20"  ;
+#NET "EM_D11"  LOC = "A19"  ;
+#NET "EM_D10"  LOC = "A17"  ;
+#NET "EM_D9"  LOC = "E15"  ;
+#NET "EM_D8"  LOC = "F15"  ;
+#NET "EM_D7"  LOC = "E16"  ;
+#NET "EM_D6"  LOC = "F16"  ;
+#NET "EM_D5"  LOC = "B17"  ;
+#NET "EM_D4"  LOC = "C17"  ;
+#NET "EM_D3"  LOC = "B19"  ;
+#NET "EM_D2"  LOC = "D19"  ;
+#NET "EM_D1"  LOC = "C19"  ;
+#NET "EM_D0"  LOC = "A20"  ;
+#NET "SYSEN"  LOC = "C11"  ;
+#NET "EM_NCS6"  LOC = "E17"  ;
+#NET "EM_NCS5"  LOC = "E10"  ;
+#NET "EM_NCS4"  LOC = "E6"  ;
+#NET "EM_NCS1"  LOC = "D18"  ;
+#NET "EM_NCS0"  LOC = "D17"  ;
+#NET "EM_A10"  LOC = "C14"  ;
+#NET "EM_A9"  LOC = "C10"  ;
+#NET "EM_A8"  LOC = "C5"  ;
+#NET "EM_A7"  LOC = "A18"  ;
+#NET "EM_A6"  LOC = "A15"  ;
+#NET "EM_A5"  LOC = "A12"  ;
+#NET "EM_A4"  LOC = "A10"  ;
+#NET "EM_A3"  LOC = "E7"  ;
+#NET "EM_A2"  LOC = "A7"  ;
+#NET "EM_A1"  LOC = "C15"  ;
+#NET "db_scl"  LOC = "U4"  ;
+#NET "db_sda"  LOC = "U5"  ;
+#NET "db_sclk_rx"  LOC = "W3"  ;
+#NET "db_miso_rx"  LOC = "W2"  ;
+#NET "db_mosi_rx"  LOC = "V4"  ;
+#NET "db_sen_rx"  LOC = "V3"  ;
+#NET "db_sclk_tx"  LOC = "Y1"  ;
+#NET "db_miso_tx"  LOC = "W1"  ;
+#NET "db_mosi_tx"  LOC = "R3"  ;
+#NET "db_sen_tx"  LOC = "T4"  ;
+#NET "cgen_miso"  LOC = "U2"  ;
+#NET "cgen_mosi"  LOC = "V1"  ;
+#NET "cgen_sclk"  LOC = "R5"  ;
+#NET "cgen_sen_b"  LOC = "T1"  ;
+#NET "FPGA_TXD"  LOC = "U1"  ;
+#NET "FPGA_RXD"  LOC = "T6"  ;
+#NET "debug_00"  LOC = "P6"  ;
+#NET "debug_01"  LOC = "R6"  ;
+#NET "debug_02"  LOC = "P1"  ;
+#NET "debug_03"  LOC = "P2"  ;
+#NET "debug_04"  LOC = "N6"  ;
+#NET "debug_05"  LOC = "N5"  ;
+#NET "debug_06"  LOC = "N1"  ;
+#NET "debug_07"  LOC = "K2"  ;
+#NET "debug_08"  LOC = "K3"  ;
+#NET "debug_09"  LOC = "K6"  ;
+#NET "debug_10"  LOC = "L5"  ;
+#NET "debug_11"  LOC = "H2"  ;
+#NET "debug_12"  LOC = "K4"  ;
+#NET "debug_13"  LOC = "K5"  ;
+#NET "debug_14"  LOC = "G1"  ;
+#NET "debug_15"  LOC = "H1"  ;
+#NET "debug_16"  LOC = "H5"  ;
+#NET "debug_17"  LOC = "H6"  ;
+#NET "debug_18"  LOC = "E3"  ;
+#NET "debug_19"  LOC = "E4"  ;
+#NET "debug_20"  LOC = "G5"  ;
+#NET "debug_21"  LOC = "G6"  ;
+#NET "debug_22"  LOC = "F2"  ;
+#NET "debug_23"  LOC = "F1"  ;
+#NET "debug_24"  LOC = "H3"  ;
+#NET "debug_25"  LOC = "H4"  ;
+#NET "debug_26"  LOC = "F4"  ;
+#NET "debug_27"  LOC = "F5"  ;
+#NET "debug_28"  LOC = "C2"  ;
+#NET "debug_29"  LOC = "C1"  ;
+#NET "debug_30"  LOC = "F3"  ;
+#NET "debug_31"  LOC = "G3"  ;
+#NET "debug_pb2"  LOC = "Y2"  ;
+#NET "debug_pb1"  LOC = "AA1"  ;
+#NET "debug_pb0"  LOC = "N3"  ;
+#NET "dip_sw_7"  LOC = "T3"  ;
+#NET "dip_sw_6"  LOC = "U3"  ;
+#NET "dip_sw_5"  LOC = "M3"  ;
+#NET "dip_sw_4"  LOC = "N4"  ;
+#NET "dip_sw_3"  LOC = "J3"  ;
+#NET "dip_sw_2"  LOC = "J4"  ;
+#NET "dip_sw_1"  LOC = "J6"  ;
+#NET "dip_sw_0"  LOC = "J7"  ;
+#NET "cgen_st_status"  LOC = "D4"  ;
+#NET "cgen_st_ld"  LOC = "D1"  ;
+#NET "cgen_st_refmon"  LOC = "E1"  ;
+#NET "cgen_sync_b"  LOC = "M1"  ;
+#NET "cgen_ref_sel"  LOC = "J1"  ;
+#NET "debug_clk0"  LOC = "L6"  ;
+#NET "debug_clk1"  LOC = "M5"  ;
+#NET "unnamed_net37"  LOC = "B1"  ;
+#NET "unnamed_net36"  LOC = "B22"  ;
+#NET "unnamed_net35"  LOC = "D2"  ;
+#NET "unnamed_net34"  LOC = "A21"  ;
+#NET "GND"  LOC = "V19"  ;
+#NET "fpga_cfg_prog_b"  LOC = "A2"  ;
+#NET "fpga_cfg_done"  LOC = "AB21"  ;
+#NET "unnamed_net45"  LOC = "F7"  ;
+#NET "fpga_cfg_din"  LOC = "W17"  ;
+#NET "fpga_cfg_cclk"  LOC = "V17"  ;
+#NET "fpga_cfg_init_b"  LOC = "W15"  ;
+#NET "unnamed_net44"  LOC = "V6"  ;
+#NET "unnamed_net43"  LOC = "AA3"  ;
+#NET "unnamed_net42"  LOC = "AB3"  ;
+#NET "aux_sdi_codec"  LOC = "F19"  ;
+#NET "aux_sdo_codec"  LOC = "F18"  ;
+#NET "aux_sclk_codec"  LOC = "D21"  ;
+#NET "reset_codec"  LOC = "D22"  ;
+#NET "sen_codec"  LOC = "D20"  ;
+#NET "mosi_codec"  LOC = "E19"  ;
+#NET "miso_codec"  LOC = "F21"  ;
+#NET "sclk_codec"  LOC = "E20"  ;
+#NET "RXSYNC"  LOC = "F22"  ;
+#NET "DB11"  LOC = "E22"  ;
+#NET "DB10"  LOC = "J19"  ;
+#NET "DB09"  LOC = "H20"  ;
+#NET "DB08"  LOC = "G19"  ;
+#NET "DB07"  LOC = "F20"  ;
+#NET "DB06"  LOC = "K16"  ;
+#NET "DB05"  LOC = "J17"  ;
+#NET "DB04"  LOC = "H22"  ;
+#NET "DB03"  LOC = "G22"  ;
+#NET "DB02"  LOC = "H17"  ;
+#NET "DB01"  LOC = "H18"  ;
+#NET "DB00"  LOC = "K20"  ;
+#NET "DA11"  LOC = "J20"  ;
+#NET "DA10"  LOC = "K19"  ;
+#NET "DA09"  LOC = "K18"  ;
+#NET "DA08"  LOC = "L22"  ;
+#NET "DA07"  LOC = "K22"  ;
+#NET "DA06"  LOC = "N22"  ;
+#NET "DA05"  LOC = "M22"  ;
+#NET "DA04"  LOC = "N20"  ;
+#NET "DA03"  LOC = "N19"  ;
+#NET "DA02"  LOC = "R22"  ;
+#NET "DA01"  LOC = "P22"  ;
+#NET "DA00"  LOC = "N17"  ;
+#NET "TX13"  LOC = "P19"  ;
+#NET "TX12"  LOC = "R18"  ;
+#NET "TX11"  LOC = "U20"  ;
+#NET "TX10"  LOC = "T20"  ;
+#NET "TX09"  LOC = "R19"  ;
+#NET "TX08"  LOC = "R20"  ;
+#NET "TX07"  LOC = "W22"  ;
+#NET "TX06"  LOC = "Y22"  ;
+#NET "TX05"  LOC = "T18"  ;
+#NET "TX04"  LOC = "T17"  ;
+#NET "TX03"  LOC = "W19"  ;
+#NET "TX02"  LOC = "V20"  ;
+#NET "TX01"  LOC = "Y21"  ;
+#NET "TX00"  LOC = "AA22"  ;
+#NET "TXSYNC"  LOC = "U18"  ;
+#NET "TXBLANK"  LOC = "U19"  ;
+#NET "PPS_IN"  LOC = "M17"  ;
+#NET "io_tx_00"  LOC = "AB20"  ;
+#NET "io_tx_01"  LOC = "Y17"  ;
+#NET "io_tx_02"  LOC = "Y16"  ;
+#NET "io_tx_03"  LOC = "U16"  ;
+#NET "io_tx_04"  LOC = "V16"  ;
+#NET "io_tx_05"  LOC = "AB19"  ;
+#NET "io_tx_06"  LOC = "AA19"  ;
+#NET "io_tx_07"  LOC = "U14"  ;
+#NET "io_tx_08"  LOC = "U15"  ;
+#NET "io_tx_09"  LOC = "AB17"  ;
+#NET "io_tx_10"  LOC = "AB18"  ;
+#NET "io_tx_11"  LOC = "Y13"  ;
+#NET "io_tx_12"  LOC = "W14"  ;
+#NET "io_tx_13"  LOC = "U13"  ;
+#NET "io_tx_14"  LOC = "AA15"  ;
+#NET "io_tx_15"  LOC = "AB14"  ;
+#NET "io_rx_00"  LOC = "Y8"  ;
+#NET "io_rx_01"  LOC = "Y9"  ;
+#NET "io_rx_02"  LOC = "V7"  ;
+#NET "io_rx_03"  LOC = "U8"  ;
+#NET "io_rx_04"  LOC = "V10"  ;
+#NET "io_rx_05"  LOC = "U9"  ;
+#NET "io_rx_06"  LOC = "AB7"  ;
+#NET "io_rx_07"  LOC = "AA8"  ;
+#NET "io_rx_08"  LOC = "W8"  ;
+#NET "io_rx_09"  LOC = "V8"  ;
+#NET "io_rx_10"  LOC = "AB5"  ;
+#NET "io_rx_11"  LOC = "AB6"  ;
+#NET "io_rx_12"  LOC = "AB4"  ;
+#NET "io_rx_13"  LOC = "AA4"  ;
+#NET "io_rx_14"  LOC = "W5"  ;
+#NET "io_rx_15"  LOC = "Y4"  ;
+#NET "CLKOUT2_CODEC"  LOC = "U12"  ;
+#NET "CLKOUT1_CODEC"  LOC = "V12"  ;
+
+NET "CLK_FPGA_P"  LOC = "Y11"  ;
+NET "CLK_FPGA_N"  LOC = "Y10"  ;
+NET "debug_led<2>"  LOC = "T5"  ;
+NET "debug_led<1>"  LOC = "R2"  ;
+NET "debug_led<0>"  LOC = "R1"  ;
diff --git a/usrp2/top/safe_u1e/safe_u1e.v b/usrp2/top/safe_u1e/safe_u1e.v
index c880a9e55..79aaac6cd 100644
--- a/usrp2/top/safe_u1e/safe_u1e.v
+++ b/usrp2/top/safe_u1e/safe_u1e.v
@@ -4,131 +4,14 @@
 module safe_u1e
   (
    input CLK_FPGA_P, input CLK_FPGA_N,  // Diff
-   
-   // ADC
-   //input ADC_clkout_p, //input ADC_clkout_n,
-   //input ADCA_12_p, //input ADCA_12_n,
-   //input ADCA_10_p, //input ADCA_10_n,
-   //input ADCA_8_p, //input ADCA_8_n,
-   //input ADCA_6_p, //input ADCA_6_n,
-   //input ADCA_4_p, //input ADCA_4_n,
-   //input ADCA_2_p, //input ADCA_2_n,
-   //input ADCA_0_p, //input ADCA_0_n,
-   //input ADCB_12_p, //input ADCB_12_n,
-   //input ADCB_10_p, //input ADCB_10_n,
-   //input ADCB_8_p, //input ADCB_8_n,
-   //input ADCB_6_p, //input ADCB_6_n,
-   //input ADCB_4_p, //input ADCB_4_n,
-   //input ADCB_2_p, //input ADCB_2_n,
-   //input ADCB_0_p, //input ADCB_0_n,
-   
-   // DAC
-   //output [15:0] DACA,
-   //output [15:0] DACB,
-   //input DAC_LOCK,     // unused for now
-   
-   // DB IO Pins
-   //inout [15:0] io_tx,
-   //inout [15:0] io_rx,
-
-   // Misc, debug
-   output [5:1] leds,  // LED4 is shared w/INIT_B
-   //input FPGA_RESET,
-   //output [1:0] debug_clk,
-   //output [31:0] debug,
-   //output [3:1] TXD, //input [3:1] RXD, // UARTs
-   ////input [3:0] dipsw,  // Forgot DIP Switches...
-   
-   // Clock Gen Control
-   //output [1:0] clk_en,
-   //output [1:0] clk_sel,
-   //input CLK_FUNC,        // FIXME is an //input to control the 9510
-   //input CLK_STATUS,
-
-   //inout SCL, //inout SDA,   // I2C
-
-   // PPS
-   //input PPS_IN, //input PPS2_IN,
-
-   // SPI
-   //output SEN_CLK, //output SCLK_CLK, //output MOSI_CLK, //input MISO_CLK,
-   //output SEN_DAC, //output SCLK_DAC, //output MOSI_DAC, //input MISO_DAC,
-   //output SEN_ADC, //output SCLK_ADC, //output MOSI_ADC,
-   //output SEN_TX_DB, //output SCLK_TX_DB, //output MOSI_TX_DB, //input MISO_TX_DB,
-   //output SEN_TX_DAC, //output SCLK_TX_DAC, //output MOSI_TX_DAC,
-   //output SEN_TX_ADC, //output SCLK_TX_ADC, //output MOSI_TX_ADC, //input MISO_TX_ADC,
-   //output SEN_RX_DB, //output SCLK_RX_DB, //output MOSI_RX_DB, //input MISO_RX_DB,
-   //output SEN_RX_DAC, //output SCLK_RX_DAC, //output MOSI_RX_DAC,
-   //output SEN_RX_ADC, //output SCLK_RX_ADC, //output MOSI_RX_ADC, //input MISO_RX_ADC,
-
-   // GigE PHY
-   //input CLK_TO_MAC,
-
-   //output reg [7:0] GMII_TXD,
-   //output reg GMII_TX_EN,
-   //output reg GMII_TX_ER,
-   //output GMII_GTX_CLK,
-   //input GMII_TX_CLK,  // 100mbps clk
-
-   //input GMII_RX_CLK,
-   //input [7:0] GMII_RXD,
-   //input GMII_RX_DV,
-   //input GMII_RX_ER,
-   //input GMII_COL,
-   //input GMII_CRS,
-
-   //input PHY_INTn,   // open drain
-   //inout MDIO,
-   //output MDC,
-   //output PHY_RESETn,
-   output ETH_LED
-   
-   //input POR,
-   
-   // Expansion
-   //input exp_time_in_p, //input exp_time_in_n, // Diff
-   //output exp_time_out_p, //output exp_time_out_n, // Diff 
-   //input exp_user_in_p, //input exp_user_in_n, // Diff
-   //output exp_user_out_p, //output exp_user_out_n, // Diff 
-   
-   // SERDES
-   //output ser_enable,
-   //output ser_prbsen,
-   //output ser_loopen,
-   //output ser_rx_en,
-   
-   //output ser_tx_clk,
-   //output reg [15:0] ser_t,
-   //output reg ser_tklsb,
-   //output reg ser_tkmsb,
-
-   //input ser_rx_clk,
-   //input [15:0] ser_r,
-   //input ser_rklsb,
-   //input ser_rkmsb,
-
-   // SRAM
-   //inout [35:0] RAM_D,
-   //output [20:0] RAM_A,
-   //output [3:0] RAM_BWn,
-   //output RAM_ZZ,
-   //output RAM_LDn,
-   //output RAM_OEn,
-   //output RAM_WEn,
-   //output RAM_CENn,
-   //output RAM_CLK,
-   
-   // SPI Flash
-   //output flash_cs,
-   //output flash_clk,
-   //output flash_mosi,
-   //input flash_miso
+   output [2:0] debug_led
    );
 
    // FPGA-specific pins connections
-   wire 	clk_fpga, dsp_clk, clk_div, dcm_out, wb_clk, clock_ready;
-
-   IBUFGDS clk_fpga_pin (.O(clk_fpga),.I(CLK_FPGA_P),.IB(CLK_FPGA_N));
+   wire  clk_fpga;
+   
+   IBUFGDS #(.IOSTANDARD("LVDS_33"), .DIFF_TERM("TRUE")) 
+   clk_fpga_pin (.O(clk_fpga),.I(CLK_FPGA_P),.IB(CLK_FPGA_N));
    defparam 	clk_fpga_pin.IOSTANDARD = "LVPECL_25";
 
    reg [31:0] 	ctr;
@@ -136,227 +19,6 @@ module safe_u1e
    always @(posedge clk_fpga)
      ctr <= ctr + 1;
 
-   assign {leds,ETH_LED} = ~ctr[29:24];
-   
-
-/*   
-   wire 	exp_time_in;
-   IBUFDS exp_time_in_pin (.O(exp_time_in),.I(exp_time_in_p),.IB(exp_time_in_n));
-   defparam 	exp_time_in_pin.IOSTANDARD = "LVDS_25";
-   
-   wire 	exp_time_out;
-   OBUFDS exp_time_out_pin (.O(exp_time_out_p),.OB(exp_time_out_n),.I(exp_time_out));
-   defparam 	exp_time_out_pin.IOSTANDARD  = "LVDS_25";
-
-   wire 	dcm_rst 		    = 0;
-
-   wire [13:0] 	adc_a, adc_b;
-
-   capture_ddrlvds #(.WIDTH(14)) capture_ddrlvds
-     (.clk(dsp_clk), .ssclk_p(ADC_clkout_p), .ssclk_n(ADC_clkout_n), 
-      .in_p({{ADCA_12_p, ADCA_10_p, ADCA_8_p, ADCA_6_p, ADCA_4_p, ADCA_2_p, ADCA_0_p},
-	     {ADCB_12_p, ADCB_10_p, ADCB_8_p, ADCB_6_p, ADCB_4_p, ADCB_2_p, ADCB_0_p}}), 
-      .in_n({{ADCA_12_n, ADCA_10_n, ADCA_8_n, ADCA_6_n, ADCA_4_n, ADCA_2_n, ADCA_0_n},
-	     {ADCB_12_n, ADCB_10_n, ADCB_8_n, ADCB_6_n, ADCB_4_n, ADCB_2_n, ADCB_0_n}}), 
-      .out({adc_a,adc_b}));
-   
-   // Handle Clocks
-   DCM DCM_INST (.CLKFB(dsp_clk), 
-                 .CLKIN(clk_fpga), 
-                 .DSSEN(0), 
-                 .PSCLK(0), 
-                 .PSEN(0), 
-                 .PSINCDEC(0), 
-                 .RST(dcm_rst), 
-                 .CLKDV(clk_div), 
-                 .CLKFX(), 
-                 .CLKFX180(), 
-                 .CLK0(dcm_out), 
-                 .CLK2X(), 
-                 .CLK2X180(), 
-                 .CLK90(), 
-                 .CLK180(), 
-                 .CLK270(), 
-                 .LOCKED(LOCKED_OUT), 
-                 .PSDONE(), 
-                 .STATUS());
-   defparam DCM_INST.CLK_FEEDBACK = "1X";
-   defparam DCM_INST.CLKDV_DIVIDE = 2.0;
-   defparam DCM_INST.CLKFX_DIVIDE = 1;
-   defparam DCM_INST.CLKFX_MULTIPLY = 4;
-   defparam DCM_INST.CLKIN_DIVIDE_BY_2 = "FALSE";
-   defparam DCM_INST.CLKIN_PERIOD = 10.000;
-   defparam DCM_INST.CLKOUT_PHASE_SHIFT = "NONE";
-   defparam DCM_INST.DESKEW_ADJUST = "SYSTEM_SYNCHRONOUS";
-   defparam DCM_INST.DFS_FREQUENCY_MODE = "LOW";
-   defparam DCM_INST.DLL_FREQUENCY_MODE = "LOW";
-   defparam DCM_INST.DUTY_CYCLE_CORRECTION = "TRUE";
-   defparam DCM_INST.FACTORY_JF = 16'h8080;
-   defparam DCM_INST.PHASE_SHIFT = 0;
-   defparam DCM_INST.STARTUP_WAIT = "FALSE";
-
-   BUFG dspclk_BUFG (.I(dcm_out), .O(dsp_clk));
-   BUFG wbclk_BUFG (.I(clk_div), .O(wb_clk));
-
-   // I2C -- Don't use external transistors for open drain, the FPGA implements this
-   IOBUF scl_pin(.O(scl_pad_i), .IO(SCL), .I(scl_pad_o), .T(scl_pad_oen_o));
-   IOBUF sda_pin(.O(sda_pad_i), .IO(SDA), .I(sda_pad_o), .T(sda_pad_oen_o));
-
-   // LEDs are active low outputs
-   wire [4:0] leds_int;
-   assign     leds = ~leds_int;  // drive low to turn on leds
-   
-   // SPI
-   wire       miso, mosi, sclk;
+   assign debug_led = ctr[27:25];
 
-   assign 	{SCLK_CLK,MOSI_CLK} 	   = ~SEN_CLK ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_DAC,MOSI_DAC} 	   = ~SEN_DAC ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_ADC,MOSI_ADC} 	   = ~SEN_ADC ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_TX_DB,MOSI_TX_DB}    = ~SEN_TX_DB ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_TX_DAC,MOSI_TX_DAC}  = ~SEN_TX_DAC ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_TX_ADC,MOSI_TX_ADC}  = ~SEN_TX_ADC ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_RX_DB,MOSI_RX_DB}    = ~SEN_RX_DB ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_RX_DAC,MOSI_RX_DAC}  = ~SEN_RX_DAC ? {sclk,mosi} : 2'B0;
-   assign 	{SCLK_RX_ADC,MOSI_RX_ADC}  = ~SEN_RX_ADC ? {sclk,mosi} : 2'B0;
-   
-   assign 	miso 			   = (~SEN_CLK & MISO_CLK) | (~SEN_DAC & MISO_DAC) |
-					     (~SEN_TX_DB & MISO_TX_DB) | (~SEN_TX_ADC & MISO_TX_ADC) |
-					     (~SEN_RX_DB & MISO_RX_DB) | (~SEN_RX_ADC & MISO_RX_ADC);
-   
-   wire 	GMII_TX_EN_unreg, GMII_TX_ER_unreg;
-   wire [7:0] 	GMII_TXD_unreg;
-   wire 	GMII_GTX_CLK_int;
-   
-   always @(posedge GMII_GTX_CLK_int)
-     begin
-	GMII_TX_EN <= GMII_TX_EN_unreg;
-	GMII_TX_ER <= GMII_TX_ER_unreg;
-	GMII_TXD <= GMII_TXD_unreg;
-     end
-
-   OFDDRRSE OFDDRRSE_gmii_inst 
-     (.Q(GMII_GTX_CLK),      // Data output (connect directly to top-level port)
-      .C0(GMII_GTX_CLK_int),    // 0 degree clock input
-      .C1(~GMII_GTX_CLK_int),    // 180 degree clock input
-      .CE(1),    // Clock enable input
-      .D0(0),    // Posedge data input
-      .D1(1),    // Negedge data input
-      .R(0),      // Synchronous reset input
-      .S(0)       // Synchronous preset input
-      );
-   
-   wire ser_tklsb_unreg, ser_tkmsb_unreg;
-   wire [15:0] ser_t_unreg;
-   wire        ser_tx_clk_int;
-   
-   always @(posedge ser_tx_clk_int)
-     begin
-	ser_tklsb <= ser_tklsb_unreg;
-	ser_tkmsb <= ser_tkmsb_unreg;
-	ser_t <= ser_t_unreg;
-     end
-
-   assign ser_tx_clk = clk_fpga;
-
-   reg [15:0] ser_r_int;
-   reg 	      ser_rklsb_int, ser_rkmsb_int;
-
-   always @(posedge ser_rx_clk)
-     begin
-	ser_r_int <= ser_r;
-	ser_rklsb_int <= ser_rklsb;
-	ser_rkmsb_int <= ser_rkmsb;
-     end
-   
-   u2_core u2_core(.dsp_clk           (dsp_clk),
-		     .wb_clk            (wb_clk),
-		     .clock_ready       (clock_ready),
-		     .clk_to_mac	(clk_to_mac),
-		     .pps_in		(pps_in),
-		     .leds		(leds_int),
-		     .debug		(debug[31:0]),
-		     .debug_clk		(debug_clk[1:0]),
-		     .exp_pps_in	(exp_time_in),
-		     .exp_pps_out	(exp_time_out),
-		     .GMII_COL		(GMII_COL),
-		     .GMII_CRS		(GMII_CRS),
-		     .GMII_TXD		(GMII_TXD_unreg[7:0]),
-		     .GMII_TX_EN	(GMII_TX_EN_unreg),
-		     .GMII_TX_ER	(GMII_TX_ER_unreg),
-		     .GMII_GTX_CLK	(GMII_GTX_CLK_int),
-		     .GMII_TX_CLK	(GMII_TX_CLK),
-		     .GMII_RXD		(GMII_RXD[7:0]),
-		     .GMII_RX_CLK	(GMII_RX_CLK),
-		     .GMII_RX_DV	(GMII_RX_DV),
-		     .GMII_RX_ER	(GMII_RX_ER),
-		     .MDIO		(MDIO),
-		     .MDC		(MDC),
-		     .PHY_INTn		(PHY_INTn),
-		     .PHY_RESETn	(PHY_RESETn),
-		     .ser_enable	(ser_enable),
-		     .ser_prbsen	(ser_prbsen),
-		     .ser_loopen	(ser_loopen),
-		     .ser_rx_en		(ser_rx_en),
-		     .ser_tx_clk	(ser_tx_clk_int),
-		     .ser_t		(ser_t_unreg[15:0]),
-		     .ser_tklsb		(ser_tklsb_unreg),
-		     .ser_tkmsb		(ser_tkmsb_unreg),
-		     .ser_rx_clk	(ser_rx_clk),
-		     .ser_r		(ser_r_int[15:0]),
-		     .ser_rklsb		(ser_rklsb_int),
-		     .ser_rkmsb		(ser_rkmsb_int),
-		     .cpld_start        (cpld_start),
-		     .cpld_mode         (cpld_mode),
-		     .cpld_done         (cpld_done),
-		     .cpld_din          (cpld_din),
-		     .cpld_clk          (cpld_clk),
-		     .cpld_detached     (cpld_detached),
-		     .adc_a		(adc_a[13:0]),
-		     .adc_ovf_a		(adc_ovf_a),
-		     .adc_on_a		(adc_on_a),
-		     .adc_oe_a		(adc_oe_a),
-		     .adc_b		(adc_b[13:0]),
-		     .adc_ovf_b		(adc_ovf_b),
-		     .adc_on_b		(adc_on_b),
-		     .adc_oe_b		(adc_oe_b),
-		     .dac_a		(DACA[15:0]),
-		     .dac_b		(DACB[15:0]),
-		     .scl_pad_i		(scl_pad_i),
-		     .scl_pad_o		(scl_pad_o),
-		     .scl_pad_oen_o	(scl_pad_oen_o),
-		     .sda_pad_i		(sda_pad_i),
-		     .sda_pad_o		(sda_pad_o),
-		     .sda_pad_oen_o	(sda_pad_oen_o),
-		     .clk_en		(clk_en[1:0]),
-		     .clk_sel		(clk_sel[1:0]),
-		     .clk_func		(clk_func),
-		     .clk_status	(clk_status),
-		     .sclk		(sclk_int),
-		     .mosi		(mosi),
-		     .miso		(miso),
-		     .sen_clk		(sen_clk),
-		     .sen_dac		(sen_dac),
-		     .sen_tx_db		(sen_tx_db),
-		     .sen_tx_adc	(sen_tx_adc),
-		     .sen_tx_dac	(sen_tx_dac),
-		     .sen_rx_db		(sen_rx_db),
-		     .sen_rx_adc	(sen_rx_adc),
-		     .sen_rx_dac	(sen_rx_dac),
-		     .io_tx		(io_tx[15:0]),
-		     .io_rx		(io_rx[15:0]),
-		     .RAM_D             (RAM_D),
-		     .RAM_A             (RAM_A),
-		     .RAM_CE1n          (RAM_CE1n),
-		     .RAM_CENn          (RAM_CENn),
-		     .RAM_CLK           (RAM_CLK),
-		     .RAM_WEn           (RAM_WEn),
-		     .RAM_OEn           (RAM_OEn),
-		     .RAM_LDn           (RAM_LDn), 
-		     .uart_tx_o         (uart_tx_o),
-		     .uart_rx_i         (uart_rx_i),
-		     .uart_baud_o       (),
-		     .sim_mode          (1'b0),
-		     .clock_divider     (2)
-		     );
-*/   
 endmodule // safe_u2plus