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//
// Copyright 2011 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
module u1e
(input CLK_FPGA_P, input CLK_FPGA_N, // Diff
output [3:0] debug_led, output [31:0] debug, output [1:0] debug_clk,
input debug_pb, output FPGA_TXD, input FPGA_RXD,
// GPMC
input EM_CLK, inout [15:0] EM_D, input [10:1] EM_A, input [1:0] EM_NBE,
input EM_WAIT0, input EM_NCS4, input EM_NCS5, input EM_NCS6,
input EM_NWE, input EM_NOE,
inout db_sda, inout db_scl, // I2C
output db_sclk_tx, output db_sen_tx, output db_mosi_tx, input db_miso_tx, // DB TX SPI
output db_sclk_rx, output db_sen_rx, output db_mosi_rx, input db_miso_rx, // DB TX SPI
output sclk_codec, output sen_codec, output mosi_codec, input miso_codec, // AD9862 main SPI
output cgen_sclk, output cgen_sen_b, output cgen_mosi, input cgen_miso, // Clock gen SPI
input cgen_st_status, input cgen_st_ld, input cgen_st_refmon, output cgen_sync_b, output cgen_ref_sel,
input overo_gpio65, input overo_gpio128, input overo_gpio145, output overo_gpio147, //aux SPI
output overo_gpio144, output overo_gpio146, // Fifo controls
input overo_gpio0, input overo_gpio14, input overo_gpio21, input overo_gpio22, // Misc GPIO
input overo_gpio23, input overo_gpio64, input overo_gpio127, // Misc GPIO
input overo_gpio176, input overo_gpio163, input overo_gpio170, // Misc GPIO
inout [15:0] io_tx, inout [15:0] io_rx,
output [13:0] TX, output TXSYNC, output TXBLANK,
input [11:0] DA, input [11:0] DB, input RXSYNC,
input PPS_IN
);
// /////////////////////////////////////////////////////////////////////////
// Clocking
wire clk_fpga, clk_fpga_in;
IBUFGDS #(.IOSTANDARD("LVDS_33"), .DIFF_TERM("TRUE"))
clk_fpga_pin (.O(clk_fpga_in),.I(CLK_FPGA_P),.IB(CLK_FPGA_N));
wire clk_2x, dcm_rst, dcm_locked, clk_fb;
DCM #(.CLK_FEEDBACK ( "1X" ),
.CLKDV_DIVIDE ( 2 ),
.CLKFX_DIVIDE ( 2 ),
.CLKFX_MULTIPLY ( 2 ),
.CLKIN_DIVIDE_BY_2 ( "FALSE" ),
.CLKIN_PERIOD ( 15.625 ),
.CLKOUT_PHASE_SHIFT ( "NONE" ),
.DESKEW_ADJUST ( "SYSTEM_SYNCHRONOUS" ),
.DFS_FREQUENCY_MODE ( "LOW" ),
.DLL_FREQUENCY_MODE ( "LOW" ),
.DUTY_CYCLE_CORRECTION ( "TRUE" ),
.FACTORY_JF ( 16'h8080 ),
.PHASE_SHIFT ( 0 ),
.STARTUP_WAIT ( "FALSE" ))
clk_doubler (.CLKFB(clk_fb), .CLKIN(clk_fpga_in), .RST(dcm_rst),
.DSSEN(0), .PSCLK(0), .PSEN(0), .PSINCDEC(0), .PSDONE(),
.CLKDV(), .CLKFX(), .CLKFX180(),
.CLK2X(), .CLK2X180(),
.CLK0(clk_fb), .CLK90(clk_fpga), .CLK180(), .CLK270(),
.LOCKED(dcm_locked), .STATUS());
// /////////////////////////////////////////////////////////////////////////
// SPI
wire mosi, sclk, miso;
assign { db_sclk_tx, db_mosi_tx } = ~db_sen_tx ? {sclk,mosi} : 2'b0;
assign { db_sclk_rx, db_mosi_rx } = ~db_sen_rx ? {sclk,mosi} : 2'b0;
assign { sclk_codec, mosi_codec } = ~sen_codec ? {sclk,mosi} : 2'b0;
//assign { cgen_sclk, cgen_mosi } = ~cgen_sen_b ? {sclk,mosi} : 2'b0; //replaced by aux spi
assign miso = (~db_sen_tx & db_miso_tx) | (~db_sen_rx & db_miso_rx) |
(~sen_codec & miso_codec) | (~cgen_sen_b & cgen_miso);
//assign the aux spi to the cgen (bypasses wishbone)
assign cgen_sclk = overo_gpio65;
assign cgen_sen_b = overo_gpio128;
assign cgen_mosi = overo_gpio145;
wire proc_int; //re-purpose gpio for interrupt when we are not using aux spi
assign overo_gpio147 = (cgen_sen_b == 1'b0)? cgen_miso : proc_int;
wire _cgen_sen_b;
//assign cgen_sen_b = _cgen_sen_b; //replaced by aux spi
// /////////////////////////////////////////////////////////////////////////
// TX DAC -- handle the interleaved data bus to DAC, with clock doubling DLL
assign TXBLANK = 0;
wire [13:0] tx_i, tx_q;
reg[13:0] delay_q;
always @(posedge clk_fpga)
delay_q <= tx_q;
genvar i;
generate
for(i=0;i<14;i=i+1)
begin : gen_dacout
ODDR2 #(.DDR_ALIGNMENT("NONE"), // Sets output alignment to "NONE", "C0" or "C1"
.INIT(1'b0), // Sets initial state of the Q output to 1'b0 or 1'b1
.SRTYPE("SYNC")) // Specifies "SYNC" or "ASYNC" set/reset
ODDR2_inst (.Q(TX[i]), // 1-bit DDR output data
.C0(clk_fpga), // 1-bit clock input
.C1(~clk_fpga), // 1-bit clock input
.CE(1'b1), // 1-bit clock enable input
.D0(tx_i[i]), // 1-bit data input (associated with C0)
.D1(delay_q[i]), // 1-bit data input (associated with C1)
.R(1'b0), // 1-bit reset input
.S(1'b0)); // 1-bit set input
end // block: gen_dacout
endgenerate
ODDR2 #(.DDR_ALIGNMENT("NONE"), // Sets output alignment to "NONE", "C0" or "C1"
.INIT(1'b0), // Sets initial state of the Q output to 1'b0 or 1'b1
.SRTYPE("SYNC")) // Specifies "SYNC" or "ASYNC" set/reset
ODDR2_txsnc (.Q(TXSYNC), // 1-bit DDR output data
.C0(clk_fpga), // 1-bit clock input
.C1(~clk_fpga), // 1-bit clock input
.CE(1'b1), // 1-bit clock enable input
.D0(1'b0), // 1-bit data input (associated with C0)
.D1(1'b1), // 1-bit data input (associated with C1)
.R(1'b0), // 1-bit reset input
.S(1'b0)); // 1-bit set input
// /////////////////////////////////////////////////////////////////////////
// Main U1E Core
u1e_core u1e_core(.clk_fpga(clk_fpga), .rst_fpga(~debug_pb),
.debug_led(debug_led), .debug(debug), .debug_clk(debug_clk),
.debug_txd(FPGA_TXD), .debug_rxd(FPGA_RXD),
.EM_CLK(EM_CLK), .EM_D(EM_D), .EM_A(EM_A), .EM_NBE(EM_NBE),
.EM_WAIT0(EM_WAIT0), .EM_NCS4(EM_NCS4), .EM_NCS5(EM_NCS5),
.EM_NCS6(EM_NCS6), .EM_NWE(EM_NWE), .EM_NOE(EM_NOE),
.db_sda(db_sda), .db_scl(db_scl),
.sclk(sclk), .sen({_cgen_sen_b,sen_codec,db_sen_tx,db_sen_rx}), .mosi(mosi), .miso(miso),
.cgen_st_status(cgen_st_status), .cgen_st_ld(cgen_st_ld),.cgen_st_refmon(cgen_st_refmon),
.cgen_sync_b(cgen_sync_b), .cgen_ref_sel(cgen_ref_sel),
.tx_have_space(overo_gpio144),
.rx_have_data(overo_gpio146),
.io_tx(io_tx), .io_rx(io_rx),
.tx_i(tx_i), .tx_q(tx_q),
.rx_i(DA), .rx_q(DB),
.pps_in(PPS_IN), .proc_int(proc_int) );
// /////////////////////////////////////////////////////////////////////////
// Local Debug
// assign debug_clk = {clk_fpga, clk_2x };
// assign debug = { TXSYNC, TXBLANK, TX };
endmodule // u1e
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