dqs_single.v 3.69 KB
Newer Older
Andrey Filippov's avatar
Andrey Filippov committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/*******************************************************************************
 * Module: dqs_single
 * Date:2014-04-26  
 * Author: Andrey Filippov
 * Description: Single-bit DDR3 DQS I/O
 *
 * Copyright (c) 2014 Elphel, Inc.
 * dqs_single.v 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.
 *
 *  dqs_single.v 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  dqs_single #(
    parameter IODELAY_GRP ="IODELAY_MEMORY",
Andrey Filippov's avatar
Andrey Filippov committed
24 25
    parameter integer IDELAY_VALUE = 0,
    parameter integer ODELAY_VALUE = 0,
Andrey Filippov's avatar
Andrey Filippov committed
26 27 28 29 30 31 32 33 34 35 36 37
    parameter IBUF_LOW_PWR ="TRUE",
    parameter IOSTANDARD = "DIFF_SSTL15_T_DCI",
    parameter SLEW = "SLOW",
    parameter real REFCLK_FREQUENCY = 300.0,
    parameter HIGH_PERFORMANCE_MODE = "FALSE"
)(
    inout       dqs,
    inout       ndqs,
    input       clk,
    input       clk_div,
    input       rst,
    output      dqs_received_dly,
38 39 40
//    output      dqs_di, // debugging:
     //Input buffer ddrc_sequencer_i/phy_cmd_i/phy_top_i/byte_lane0_i/dqs_i/iobufs_dqs_i/IBUFDS/IBUFDS_S (in ddrc_sequencer_i/phy_cmd_i/phy_top_i/byte_lane0_i/dqs_i/iobufs_dqs_i macro) has no loads. An input buffer must drive an internal load.
     
Andrey Filippov's avatar
Andrey Filippov committed
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
    input       dci_disable,  // disable DCI termination during writes and idle
    input [7:0] dly_data,
    input [3:0] din,
    input [3:0] tin,
    input       set_odelay,
    input       ld_odelay,
    input       set_idelay,
    input       ld_idelay
);
wire d_ser;
wire dqs_tri;
wire dqs_data_dly;
wire dqs_di;


oserdes_mem oserdes_i (
    .clk(clk),          // serial output clock
    .clk_div(clk_div),  // oclk divided by 2, front aligned
    .rst(rst),          // reset
    .din(din[3:0]),     // parallel data in
    .tin(tin[3:0]),     // parallel tri-state in
    .dout_dly(d_ser),   // data out to be connected to odelay input
    .dout_iob(),        // data out to be connected directly to the output buffer
    .tout_dly(),        // tristate out to be connected to odelay input
    .tout_iob(dqs_tri)  // tristate out to be connected directly to the tristate control of the output buffer
);
odelay_fine_pipe # (
    .IODELAY_GRP(IODELAY_GRP),
Andrey Filippov's avatar
Andrey Filippov committed
69
    .DELAY_VALUE(ODELAY_VALUE),
Andrey Filippov's avatar
Andrey Filippov committed
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
    .REFCLK_FREQUENCY(REFCLK_FREQUENCY),
    .HIGH_PERFORMANCE_MODE(HIGH_PERFORMANCE_MODE)
) dqs_out_dly_i(
    .clk(clk_div),
    .rst(rst),
    .set(set_odelay),
    .ld(ld_odelay),
    .delay(dly_data[7:0]),
    .data_in(d_ser),
    .data_out(dqs_data_dly)
);

IOBUFDS_DCIEN #(
    .DIFF_TERM("FALSE"),
    .DQS_BIAS("TRUE"),     // outputs 1'b0 when IOB is floating
    .IBUF_LOW_PWR(IBUF_LOW_PWR), //
    .IOSTANDARD(IOSTANDARD),
    .SLEW(SLEW),
    .USE_IBUFDISABLE("FALSE")
) iobufs_dqs_i (
    .O(dqs_di),
    .IO(dqs),
    .IOB(ndqs),
    .DCITERMDISABLE(dci_disable),
    .IBUFDISABLE(1'b0),
    .I(dqs_data_dly), //dqs_data),
    .T(dqs_tri));
idelay_fine_pipe # (
    .IODELAY_GRP(IODELAY_GRP),
Andrey Filippov's avatar
Andrey Filippov committed
99
    .DELAY_VALUE(IDELAY_VALUE),
Andrey Filippov's avatar
Andrey Filippov committed
100 101 102 103 104 105 106 107 108 109 110 111 112
    .REFCLK_FREQUENCY(REFCLK_FREQUENCY),
    .HIGH_PERFORMANCE_MODE(HIGH_PERFORMANCE_MODE)
) dqs_in_dly_i(
    .clk(clk_div),
    .rst(rst),
    .set(set_idelay),
    .ld(ld_idelay),
    .delay(dly_data[7:0]),
    .data_in(dqs_di),
    .data_out(dqs_received_dly)
);
endmodule