之前写过VGA，其实HDMI也写过，但是没记笔记。
HDMI 是新一代的多媒体接口标准，英文全称是 High-Definition Multimedia Interface，即高清多媒体接 口。它能够同时传输视频和音频，简化了设备的接口和连线；同时提供了更高的数据传输带宽，可以传输 无压缩的数字音频及高分辨率视频信号。HDMI 1.0 版本于 2002 年发布，最高数据传输速度为 5Gbps；而 2017 年发布的 HDMI 2.1 标准的理论带宽可达 48Gbps。 HDMI 向下兼容 DVI，但是 DVI（数字视频接口）只能用来传输视频，而不能同时传输音频，这是两者最主要的差别。此外，DVI 接口的尺寸明显大于 HDMI 接口。
TMDS（Transition Minimized Differential Signaling，最小化传输差分信号）是美国 Silicon Image 公司开发的一项高速数据传输技术，在 DVI 和 HDMI 视频接口中使用差分信号传输高速串行数据。DVI 和 HDMI 接口协议在物理层使用 TMDS 标准传输音视频数据。
VGA时序
VGA Signal Timing (tinyvga.com)
介绍
规范：
小结：
VGA像素编码以后通过差分对端口以十倍像素时钟的速率地串行发送，就是HDMI协议（或者说DVI）。
我们通过VGA实现HDMI协议需要把其中输出的数据做：
1.Encode
2.Oserdese2
3.Obufds
分别对应：编码，并行转串行，差分输出。
官方例程
HDMI编码器
来自xaap460的编码器
//
//
// Xilinx, Inc. 2008 www.xilinx.com
//
//
//
// File name : encode.v
//
// Description : TMDS encoder
//
// Date - revision : Jan. 2008 - v 1.0
//
// Author : Bob Feng
//
// Disclaimer: LIMITED WARRANTY AND DISCLAMER. These designs are
// provided to you "as is". Xilinx and its licensors make and you
// receive no warranties or conditions, express, implied,
// statutory or otherwise, and Xilinx specifically disclaims any
// implied warranties of merchantability, non-infringement,or
// fitness for a particular purpose. Xilinx does not warrant that
// the functions contained in these designs will meet your
// requirements, or that the operation of these designs will be
// uninterrupted or error free, or that defects in the Designs
// will be corrected. Furthermore, Xilinx does not warrantor
// make any representations regarding use or the results of the
// use of the designs in terms of correctness, accuracy,
// reliability, or otherwise.
//
// LIMITATION OF LIABILITY. In no event will Xilinx or its
// licensors be liable for any loss of data, lost profits,cost
// or procurement of substitute goods or services, or for any
// special, incidental, consequential, or indirect damages
// arising from the use or operation of the designs or
// accompanying documentation, however caused and on any theory
// of liability. This limitation will apply even if Xilinx
// has been advised of the possibility of such damage. This
// limitation shall apply not-withstanding the failure of the
// essential purpose of any limited remedies herein.
//
// Copyright � 2006 Xilinx, Inc.
// All rights reserved
//
//
`timescale 1 ps / 1ps
module encode (
input clkin, // pixel clock input
input rstin, // async. reset input (active high)
input [7:0] din, // data inputs: expect registered
input c0, // c0 input
input c1, // c1 input
input de, // de input
output reg [9:0] dout // data outputs
);
// Counting number of 1s and 0s for each incoming pixel
// component. Pipe line the result.
// Register Data Input so it matches the pipe lined adder
// output
reg [3:0] n1d; //number of 1s in din
reg [7:0] din_q;
always @ (posedge clkin) begin
n1d <=#1 din[0] + din[1] + din[2] + din[3] + din[4] + din[5] + din[6] + din[7];
din_q <=#1 din;
end
///
// Stage 1: 8 bit -> 9 bit
// Refer to DVI 1.0 Specification, page 29, Figure 3-5
///
wire decision1;
assign decision1 = (n1d > 4'h4) | ((n1d == 4'h4) & (din_q[0] == 1'b0));
/*
reg [8:0] q_m;
always @ (posedge clkin) begin
q_m[0] <=#1 din_q[0];
q_m[1] <=#1 (decision1) ? (q_m[0] ^~ din_q[1]) : (q_m[0] ^ din_q[1]);
q_m[2] <=#1 (decision1) ? (q_m[1] ^~ din_q[2]) : (q_m[1] ^ din_q[2]);
q_m[3] <=#1 (decision1) ? (q_m[2] ^~ din_q[3]) : (q_m[2] ^ din_q[3]);
q_m[4] <=#1 (decision1) ? (q_m[3] ^~ din_q[4]) : (q_m[3] ^ din_q[4]);
q_m[5] <=#1 (decision1) ? (q_m[4] ^~ din_q[5]) : (q_m[4] ^ din_q[5]);
q_m[6] <=#1 (decision1) ? (q_m[5] ^~ din_q[6]) : (q_m[5] ^ din_q[6]);
q_m[7] <=#1 (decision1) ? (q_m[6] ^~ din_q[7]) : (q_m[6] ^ din_q[7]);
q_m[8] <=#1 (decision1) ? 1'b0 : 1'b1;
end
*/
wire [8:0] q_m;
assign q_m[0] = din_q[0];
assign q_m[1] = (decision1) ? (q_m[0] ^~ din_q[1]) : (q_m[0] ^ din_q[1]);
assign q_m[2] = (decision1) ? (q_m[1] ^~ din_q[2]) : (q_m[1] ^ din_q[2]);
assign q_m[3] = (decision1) ? (q_m[2] ^~ din_q[3]) : (q_m[2] ^ din_q[3]);
assign q_m[4] = (decision1) ? (q_m[3] ^~ din_q[4]) : (q_m[3] ^ din_q[4]);
assign q_m[5] = (decision1) ? (q_m[4] ^~ din_q[5]) : (q_m[4] ^ din_q[5]);
assign q_m[6] = (decision1) ? (q_m[5] ^~ din_q[6]) : (q_m[5] ^ din_q[6]);
assign q_m[7] = (decision1) ? (q_m[6] ^~ din_q[7]) : (q_m[6] ^ din_q[7]);
assign q_m[8] = (decision1) ? 1'b0 : 1'b1;
/
// Stage 2: 9 bit -> 10 bit
// Refer to DVI 1.0 Specification, page 29, Figure 3-5
/
reg [3:0] n1q_m, n0q_m; // number of 1s and 0s for q_m
always @ (posedge clkin) begin
n1q_m <=#1 q_m[0] + q_m[1] + q_m[2] + q_m[3] + q_m[4] + q_m[5] + q_m[6] + q_m[7];
n0q_m <=#1 4'h8 - (q_m[0] + q_m[1] + q_m[2] + q_m[3] + q_m[4] + q_m[5] + q_m[6] + q_m[7]);
end
parameter CTRLTOKEN0 = 10'b1101010100;
parameter CTRLTOKEN1 = 10'b0010101011;
parameter CTRLTOKEN2 = 10'b0101010100;
parameter CTRLTOKEN3 = 10'b1010101011;
reg [4:0] cnt; //disparity counter, MSB is the sign bit
wire decision2, decision3;
assign decision2 = (cnt == 5'h0) | (n1q_m == n0q_m);
/
// [(cnt > 0) and (N1q_m > N0q_m)] or [(cnt < 0) and (N0q_m > N1q_m)]
/
assign decision3 = (~cnt[4] & (n1q_m > n0q_m)) | (cnt[4] & (n0q_m > n1q_m));
// pipe line alignment
reg de_q, de_reg;
reg c0_q, c1_q;
reg c0_reg, c1_reg;
reg [8:0] q_m_reg;
always @ (posedge clkin) begin
de_q <=#1 de;
de_reg <=#1 de_q;
c0_q <=#1 c0;
c0_reg <=#1 c0_q;
c1_q <=#1 c1;
c1_reg <=#1 c1_q;
q_m_reg <=#1 q_m;
end
///
// 10-bit out
// disparity counter
///
always @ (posedge clkin or posedge rstin) begin
if(rstin) begin
dout <= 10'h0;
cnt <= 5'h0;
end else begin
if (de_reg) begin
if(decision2) begin
dout[9] <=#1 ~q_m_reg[8];
dout[8] <=#1 q_m_reg[8];
dout[7:0] <=#1 (q_m_reg[8]) ? q_m_reg[7:0] : ~q_m_reg[7:0];
cnt <=#1 (~q_m_reg[8]) ? (cnt + n0q_m - n1q_m) : (cnt + n1q_m - n0q_m);
end else begin
if(decision3) begin
dout[9] <=#1 1'b1;
dout[8] <=#1 q_m_reg[8];
dout[7:0] <=#1 ~q_m_reg;
cnt <=#1 cnt + {q_m_reg[8], 1'b0} + (n0q_m - n1q_m);
end else begin
dout[9] <=#1 1'b0;
dout[8] <=#1 q_m_reg[8];
dout[7:0] <=#1 q_m_reg[7:0];
cnt <=#1 cnt - {~q_m_reg[8], 1'b0} + (n1q_m - n0q_m);
end
end
end else begin
case ({c1_reg, c0_reg})
2'b00: dout <=#1 CTRLTOKEN0;
2'b01: dout <=#1 CTRLTOKEN1;
2'b10: dout <=#1 CTRLTOKEN2;
default: dout <=#1 CTRLTOKEN3;
endcase
cnt <=#1 5'h0;
end
end
end
endmodule
串转并
//
//
// Xilinx, Inc. 2007 www.xilinx.com
//
//
//
// File name : serdes_4b_10to1.v
//
// Description : 4-bit transmitter macro for Spartan 3A (uses ODDR2)
// Takes in 30 bits and serialises this to 4 bits DDR (4th bit is a regenerated clock)
//
// data is transmitted LSBs first
// 0, 3, 6, 9, 12, 15, 18, 21, 24, 27 - data
// 1, 4, 7, 10, 13, 16, 19, 22, 25, 28 - data
// 2, 5, 8, 11, 14, 17, 20, 23, 26, 29 - data
// 0, 0, 0, 0, 0, 1, 1, 1, 1, 1 - clock
//
//
// Author : Bob Feng
// Disclaimer: LIMITED WARRANTY AND DISCLAMER. These designs are
// provided to you "as is". Xilinx and its licensors make, and you
// receive no warranties or conditions, express, implied,
// statutory or otherwise, and Xilinx specifically disclaims any
// implied warranties of merchantability, non-infringement, or
// fitness for a particular purpose. Xilinx does not warrant that
// the functions contained in these designs will meet your
// requirements, or that the operation of these designs will be
// uninterrupted or error free, or that defects in the Designs
// will be corrected. Furthermore, Xilinx does not warrant or
// make any representations regarding use or the results of the
// use of the designs in terms of correctness, accuracy,
// reliability, or otherwise.
//
// LIMITATION OF LIABILITY. In no event will Xilinx or its
// licensors be liable for any loss of data, lost profits, cost
// or procurement of substitute goods or services, or for any
// special, incidental, consequential, or indirect damages
// arising from the use or operation of the designs or
// accompanying documentation, however caused and on any theory
// of liability. This limitation will apply even if Xilinx
// has been advised of the possibility of such damage. This
// limitation shall apply not-withstanding the failure of the
// essential purpose of any limited remedies herein.
//
// Copyright � 2007 Xilinx, Inc.
// All rights reserved
//
//
`timescale 1ns/1ps
module serdes_4b_10to1 (
input clk, // clock input
input clkx5, // 5x clock input
input clkx5not,
input [29:0] datain, // input data for serialisation
input rst, // reset
output [7:0] dataout) ; // out DDR data and clock
wire [4:0] syncp; // internal sync signals for rising edges
wire [4:0] syncn; // internal sync signals for falling edges
reg [3:0] p_mux; // muxes (+ve)
reg [3:0] n_mux; // muxes (-ve)
wire [29:0] dataint;
wire [29:0] db;
wire [3:0] wa; // RAM read address
reg [3:0] wa_d; // RAM read address
wire [3:0] ra; // RAM read address
reg [3:0] ra_d; // RAM read address
// Here we instantiate a 16x30 Dual Port RAM
// and fill first it with data aligned to
// clk domain
parameter ADDR0 = 4'b0000;
parameter ADDR1 = 4'b0001;
parameter ADDR2 = 4'b0010;
parameter ADDR3 = 4'b0011;
parameter ADDR4 = 4'b0100;
parameter ADDR5 = 4'b0101;
parameter ADDR6 = 4'b0110;
parameter ADDR7 = 4'b0111;
parameter ADDR8 = 4'b1000;
parameter ADDR9 = 4'b1001;
parameter ADDR10 = 4'b1010;
parameter ADDR11 = 4'b1011;
parameter ADDR12 = 4'b1100;
parameter ADDR13 = 4'b1101;
parameter ADDR14 = 4'b1110;
parameter ADDR15 = 4'b1111;
always@(wa) begin
case (wa)
ADDR0 : wa_d = ADDR1 ;
ADDR1 : wa_d = ADDR2 ;
ADDR2 : wa_d = ADDR3 ;
ADDR3 : wa_d = ADDR4 ;
ADDR4 : wa_d = ADDR5 ;
ADDR5 : wa_d = ADDR6 ;
ADDR6 : wa_d = ADDR7 ;
ADDR7 : wa_d = ADDR8 ;
ADDR8 : wa_d = ADDR9 ;
ADDR9 : wa_d = ADDR10;
ADDR10 : wa_d = ADDR11;
ADDR11 : wa_d = ADDR12;
ADDR12 : wa_d = ADDR13;
ADDR13 : wa_d = ADDR14;
ADDR14 : wa_d = ADDR15;
default : wa_d = ADDR0;
endcase
end
FDC fdc_wa0 (.C(clk), .D(wa_d[0]), .CLR(rst), .Q(wa[0]));
FDC fdc_wa1 (.C(clk), .D(wa_d[1]), .CLR(rst), .Q(wa[1]));
FDC fdc_wa2 (.C(clk), .D(wa_d[2]), .CLR(rst), .Q(wa[2]));
FDC fdc_wa3 (.C(clk), .D(wa_d[3]), .CLR(rst), .Q(wa[3]));
//Dual Port fifo to bridge data through
DRAM16XN #(.data_width(30))
fifo_u (
.DATA_IN(datain),
.ADDRESS(wa),
.ADDRESS_DP(ra),
.WRITE_EN(1'b1),
.CLK(clk),
.O_DATA_OUT(),
.O_DATA_OUT_DP(dataint));
/
// Here starts clk5x domain for fifo read out
// FIFO read is set to be once every 5 cycles of clk5x in order
// to keep up pace with the fifo write speed
// Also FIFO read reset is delayed a bit in order to avoid
// underflow.
/
always@(ra) begin
case (ra)
ADDR0 : ra_d = ADDR1 ;
ADDR1 : ra_d = ADDR2 ;
ADDR2 : ra_d = ADDR3 ;
ADDR3 : ra_d = ADDR4 ;
ADDR4 : ra_d = ADDR5 ;
ADDR5 : ra_d = ADDR6 ;
ADDR6 : ra_d = ADDR7 ;
ADDR7 : ra_d = ADDR8 ;
ADDR8 : ra_d = ADDR9 ;
ADDR9 : ra_d = ADDR10;
ADDR10 : ra_d = ADDR11;
ADDR11 : ra_d = ADDR12;
ADDR12 : ra_d = ADDR13;
ADDR13 : ra_d = ADDR14;
ADDR14 : ra_d = ADDR15;
default : ra_d = ADDR0;
endcase
end
wire rstsync, rstsync_q, rstp, rstn;
(* ASYNC_REG = "TRUE" *) FDP fdp_rst (.C(clkx5), .D(rst), .PRE(rst), .Q(rstsync));
FD fd_rstsync (.C(clkx5), .D(rstsync), .Q(rstsync_q));
FD fd_rstp (.C(clkx5), .D(rstsync_q), .Q(rstp));
FDRE fdc_ra0 (.C(clkx5), .D(ra_d[0]), .R(rstp), .CE(syncp[4]), .Q(ra[0]));
FDRE fdc_ra1 (.C(clkx5), .D(ra_d[1]), .R(rstp), .CE(syncp[4]), .Q(ra[1]));
FDRE fdc_ra2 (.C(clkx5), .D(ra_d[2]), .R(rstp), .CE(syncp[4]), .Q(ra[2]));
FDRE fdc_ra3 (.C(clkx5), .D(ra_d[3]), .R(rstp), .CE(syncp[4]), .Q(ra[3]));
//
// 5 Cycle Counter for clkx5
// Generate data latch and bit mux timing
//
wire [2:0] statep, staten;
reg [2:0] statep_d, staten_d;
parameter ST0 = 3'b000;
parameter ST1 = 3'b001;
parameter ST2 = 3'b011;
parameter ST3 = 3'b111;
parameter ST4 = 3'b110;
always@(statep) begin
case (statep)
ST0 : statep_d = ST1 ;
ST1 : statep_d = ST2 ;
ST2 : statep_d = ST3 ;
ST3 : statep_d = ST4 ;
default : statep_d = ST0;
endcase
end
FDR fdc_stp0 (.C(clkx5), .D(statep_d[0]), .R(rstp), .Q(statep[0]));
FDR fdc_stp1 (.C(clkx5), .D(statep_d[1]), .R(rstp), .Q(statep[1]));
FDR fdc_stp2 (.C(clkx5), .D(statep_d[2]), .R(rstp), .Q(statep[2]));
wire [4:0] syncp_d;
assign syncp_d[0] = (statep == ST0);
assign syncp_d[1] = (statep == ST1);
assign syncp_d[2] = (statep == ST2);
assign syncp_d[3] = (statep == ST3);
assign syncp_d[4] = (statep == ST4);
FD fd_syncp0 (.C(clkx5), .D(syncp_d[0]), .Q(syncp[0]));
FD fd_syncp1 (.C(clkx5), .D(syncp_d[1]), .Q(syncp[1]));
FD fd_syncp2 (.C(clkx5), .D(syncp_d[2]), .Q(syncp[2]));
FD fd_syncp3 (.C(clkx5), .D(syncp_d[3]), .Q(syncp[3]));
FD fd_syncp4 (.C(clkx5), .D(syncp_d[4]), .Q(syncp[4]));
//
// 5 Cycle Counter for clkx5not
// Generate data latch and bit mux timing
//
FD fd_rstn (.C(clkx5not), .D(rstsync_q), .Q(rstn));
always@(staten) begin
case (staten)
ST0 : staten_d = ST1 ;
ST1 : staten_d = ST2 ;
ST2 : staten_d = ST3 ;
ST3 : staten_d = ST4 ;
default : staten_d = ST0;
endcase
end
FDR fdc_stn0 (.C(clkx5not), .D(staten_d[0]), .R(rstn), .Q(staten[0]));
FDR fdc_stn1 (.C(clkx5not), .D(staten_d[1]), .R(rstn), .Q(staten[1]));
FDR fdc_stn2 (.C(clkx5not), .D(staten_d[2]), .R(rstn), .Q(staten[2]));
wire [4:0] syncn_d;
assign syncn_d[0] = (staten == ST0);
assign syncn_d[1] = (staten == ST1);
assign syncn_d[2] = (staten == ST2);
assign syncn_d[3] = (staten == ST3);
assign syncn_d[4] = (staten == ST4);
FD fd_syncn0 (.C(clkx5not), .D(syncn_d[0]), .Q(syncn[0]));
FD fd_syncn1 (.C(clkx5not), .D(syncn_d[1]), .Q(syncn[1]));
FD fd_syncn2 (.C(clkx5not), .D(syncn_d[2]), .Q(syncn[2]));
FD fd_syncn3 (.C(clkx5not), .D(syncn_d[3]), .Q(syncn[3]));
FD fd_syncn4 (.C(clkx5not), .D(syncn_d[4]), .Q(syncn[4]));
// Latch data out of FIFO
// clkx5 setup time: 5 cycles since syncp[4] is used as CE
// clkx5not setup time: 4.5 cycles since syncn[4] is used as CE
// syncn[4] is set to be 0.5 cycle earlier than syncp[4]
FDE fd_db0 (.C(clkx5not), .D(dataint[0]), .CE(syncn[4]), .Q(db[0]));
FDE fd_db1 (.C(clkx5not), .D(dataint[1]), .CE(syncn[4]), .Q(db[1]));
FDE fd_db2 (.C(clkx5not), .D(dataint[2]), .CE(syncn[4]), .Q(db[2]));
FDE fd_db3 (.C(clkx5), .D(dataint[3]), .CE(syncp[4]), .Q(db[3]));
FDE fd_db4 (.C(clkx5), .D(dataint[4]), .CE(syncp[4]), .Q(db[4]));
FDE fd_db5 (.C(clkx5), .D(dataint[5]), .CE(syncp[4]), .Q(db[5]));
FDE fd_db6 (.C(clkx5not), .D(dataint[6]), .CE(syncn[4]), .Q(db[6]));
FDE fd_db7 (.C(clkx5not), .D(dataint[7]), .CE(syncn[4]), .Q(db[7]));
FDE fd_db8 (.C(clkx5not), .D(dataint[8]), .CE(syncn[4]), .Q(db[8]));
FDE fd_db9 (.C(clkx5), .D(dataint[9]), .CE(syncp[4]), .Q(db[9]));
FDE fd_db10(.C(clkx5), .D(dataint[10]), .CE(syncp[4]), .Q(db[10]));
FDE fd_db11(.C(clkx5), .D(dataint[11]), .CE(syncp[4]), .Q(db[11]));
FDE fd_db12(.C(clkx5not), .D(dataint[12]), .CE(syncn[4]), .Q(db[12]));
FDE fd_db13(.C(clkx5not), .D(dataint[13]), .CE(syncn[4]), .Q(db[13]));
FDE fd_db14(.C(clkx5not), .D(dataint[14]), .CE(syncn[4]), .Q(db[14]));
FDE fd_db15(.C(clkx5), .D(dataint[15]), .CE(syncp[4]), .Q(db[15]));
FDE fd_db16(.C(clkx5), .D(dataint[16]), .CE(syncp[4]), .Q(db[16]));
FDE fd_db17(.C(clkx5), .D(dataint[17]), .CE(syncp[4]), .Q(db[17]));
FDE fd_db18(.C(clkx5not), .D(dataint[18]), .CE(syncn[4]), .Q(db[18]));
FDE fd_db19(.C(clkx5not), .D(dataint[19]), .CE(syncn[4]), .Q(db[19]));
FDE fd_db20(.C(clkx5not), .D(dataint[20]), .CE(syncn[4]), .Q(db[20]));
FDE fd_db21(.C(clkx5), .D(dataint[21]), .CE(syncp[4]), .Q(db[21]));
FDE fd_db22(.C(clkx5), .D(dataint[22]), .CE(syncp[4]), .Q(db[22]));
FDE fd_db23(.C(clkx5), .D(dataint[23]), .CE(syncp[4]), .Q(db[23]));
FDE fd_db24(.C(clkx5not), .D(dataint[24]), .CE(syncn[4]), .Q(db[24]));
FDE fd_db25(.C(clkx5not), .D(dataint[25]), .CE(syncn[4]), .Q(db[25]));
FDE fd_db26(.C(clkx5not), .D(dataint[26]), .CE(syncn[4]), .Q(db[26]));
FDE fd_db27(.C(clkx5), .D(dataint[27]), .CE(syncp[4]), .Q(db[27]));
FDE fd_db28(.C(clkx5), .D(dataint[28]), .CE(syncp[4]), .Q(db[28]));
FDE fd_db29(.C(clkx5), .D(dataint[29]), .CE(syncp[4]), .Q(db[29]));
//
// Data OUT Multiplexers: clk5x and clk5xnot
//
always @ (*)
begin
casex (1'b1) // synthesis parallel_case full_case
syncn[0]: begin
n_mux[0] = db[0];
n_mux[1] = db[1];
n_mux[2] = db[2];
n_mux[3] = 1'b0;
end
syncn[1]: begin
n_mux[0] = db[6];
n_mux[1] = db[7];
n_mux[2] = db[8];
n_mux[3] = 1'b0;
end
syncn[2]: begin
n_mux[0] = db[12];
n_mux[1] = db[13];
n_mux[2] = db[14];
n_mux[3] = 1'b0;
end
syncn[3]: begin
n_mux[0] = db[18];
n_mux[1] = db[19];
n_mux[2] = db[20];
n_mux[3] = 1'b1;
end
syncn[4]: begin
n_mux[0] = db[24];
n_mux[1] = db[25];
n_mux[2] = db[26];
n_mux[3] = 1'b1;
end
endcase
end
FD muxn0(.D(n_mux[0]), .C(clkx5not), .Q(dataout[4])) ;
FD muxn1(.D(n_mux[1]), .C(clkx5not), .Q(dataout[5])) ;
FD muxn2(.D(n_mux[2]), .C(clkx5not), .Q(dataout[6])) ;
FD muxn3(.D(n_mux[3]), .C(clkx5not), .Q(dataout[7])) ;
always @ (*)
begin
casex (1'b1) // synthesis parallel_case full_case
syncp[0]: begin
p_mux[0] = db[3];
p_mux[1] = db[4];
p_mux[2] = db[5];
p_mux[3] = 1'b0;
end
syncp[1]: begin
p_mux[0] = db[9];
p_mux[1] = db[10];
p_mux[2] = db[11];
p_mux[3] = 1'b0;
end
syncp[2]: begin
p_mux[0] = db[15];
p_mux[1] = db[16];
p_mux[2] = db[17];
p_mux[3] = 1'b1;
end
syncp[3]: begin
p_mux[0] = db[21];
p_mux[1] = db[22];
p_mux[2] = db[23];
p_mux[3] = 1'b1;
end
syncp[4]: begin
p_mux[0] = db[27];
p_mux[1] = db[28];
p_mux[2] = db[29];
p_mux[3] = 1'b1;
end
endcase
end
FD muxp0(.D(p_mux[0]), .C(clkx5), .Q(dataout[0])) ;
FD muxp1(.D(p_mux[1]), .C(clkx5), .Q(dataout[1])) ;
FD muxp2(.D(p_mux[2]), .C(clkx5), .Q(dataout[2])) ;
FD muxp3(.D(p_mux[3]), .C(clkx5), .Q(dataout[3])) ;
endmodule
原语OSERDESE2
两个OSERDESE2的串联方法
文章来源：https://www.toymoban.com/news/detail-734036.html
文章来源地址https://www.toymoban.com/news/detail-734036.html
OSERDESE2_Master (
.CLK (serial_clk_5x), // 串行数据时钟,5倍时钟频率
.CLKDIV (paralell_clk), // 并行数据时钟
.RST (reset), // 1-bit input: Reset
.OCE (1'b1), // 1-bit input: Output data clock enable
.OQ (serial_data_out), // 串行输出数据
.D1 (paralell_data[0]), // D1 - D8: 并行数据输入
.D2 (paralell_data[1]),
.D3 (paralell_data[2]),
.D4 (paralell_data[3]),
.D5 (paralell_data[4]),
.D6 (paralell_data[5]),
.D7 (paralell_data[6]),
.D8 (paralell_data[7]),
.SHIFTIN1 (cascade1), // SHIFTIN1 用于位宽扩展
.SHIFTIN2 (cascade2), // SHIFTIN2
.SHIFTOUT1 (), // SHIFTOUT1: 用于位宽扩展
.SHIFTOUT2 (), // SHIFTOUT2
.OFB (), // 以下是未使用信号
.T1 (1'b0),
.T2 (1'b0),
.T3 (1'b0),
.T4 (1'b0),
.TBYTEIN (1'b0),
.TCE (1'b0),
.TBYTEOUT (),
.TFB (),
.TQ ()
);
//例化OSERDESE2原语，实现并串转换,Slave模式
OSERDESE2 #(
.DATA_RATE_OQ ("DDR"), // 设置双倍数据速率
.DATA_RATE_TQ ("SDR"), // DDR, BUF, SDR
.DATA_WIDTH (10), // 输入的并行数据宽度为10bit
.SERDES_MODE ("SLAVE"), // 设置为Slave，用于10bit宽度扩展
.TBYTE_CTL ("FALSE"), // Enable tristate byte operation (FALSE, TRUE)
.TBYTE_SRC ("FALSE"), // Tristate byte source (FALSE, TRUE)
.TRISTATE_WIDTH (1) // 3-state converter width (1,4)
)
OSERDESE2_Slave (
.CLK (serial_clk_5x), // 串行数据时钟,5倍时钟频率
.CLKDIV (paralell_clk), // 并行数据时钟
.RST (reset), // 1-bit input: Reset
.OCE (1'b1), // 1-bit input: Output data clock enable
.OQ (), // 串行输出数据
.D1 (1'b0), // D1 - D8: 并行数据输入
.D2 (1'b0),
.D3 (paralell_data[8]),
.D4 (paralell_data[9]),
.D5 (1'b0),
.D6 (1'b0),
.D7 (1'b0),
.D8 (1'b0),
.SHIFTIN1 (), // SHIFTIN1 用于位宽扩展
.SHIFTIN2 (), // SHIFTIN2
.SHIFTOUT1 (cascade1), // SHIFTOUT1: 用于位宽扩展
.SHIFTOUT2 (cascade2), // SHIFTOUT2
.OFB (), // 以下是未使用信号
.T1 (1'b0),
.T2 (1'b0),
.T3 (1'b0),
.T4 (1'b0),
.TBYTEIN (1'b0),
.TCE (1'b0),
.TBYTEOUT (),
.TFB (),
.TQ ()
); 原语OBUFDS
用例
//
//
// Xilinx, Inc. 2007 www.xilinx.com
//
// XAPP xyz
//
//
//
// File name : dvi_encoder.v
//
// Description : dvi_encoder
//
// Date - revision : Feb. 2008 - 1.0.0
//
// Author : Bob Feng
//
// Disclaimer: LIMITED WARRANTY AND DISCLAMER. These designs are
// provided to you "as is". Xilinx and its licensors makeand you
// receive no warranties or conditions, express, implied,
// statutory or otherwise, and Xilinx specificallydisclaims any
// implied warranties of merchantability, non-infringement,or
// fitness for a particular purpose. Xilinx does notwarrant that
// the functions contained in these designs will meet your
// requirements, or that the operation of these designswill be
// uninterrupted or error free, or that defects in theDesigns
// will be corrected. Furthermore, Xilinx does not warrantor
// make any representations regarding use or the results ofthe
// use of the designs in terms of correctness, accuracy,
// reliability, or otherwise.
//
// LIMITATION OF LIABILITY. In no event will Xilinx or its
// licensors be liable for any loss of data, lost profits,cost
// or procurement of substitute goods or services, or forany
// special, incidental, consequential, or indirect damages
// arising from the use or operation of the designs or
// accompanying documentation, however caused and on anytheory
// of liability. This limitation will apply even if Xilinx
// has been advised of the possibility of such damage. This
// limitation shall apply not-withstanding the failure ofthe
// essential purpose of any limited remedies herein.
//
// Copyright � 2004 Xilinx, Inc.
// All rights reserved
//
//
`timescale 1 ps / 1ps
module dvi_encoder # (
parameter SDATAINVERT = "FALSE" //Invert or not SDATA before serilize it
)(
input clkin, // system clock
input clkx5in, // system clock x5
input clkx5notin, // system clock x5 not
input rstin, // reset
input [7:0] blue_din, // Blue data in
input [7:0] green_din, // Green data in
input [7:0] red_din, // Red data in
input hsync, // hsync data
input vsync, // vsync data
input de, // data enable
output [7:0] tmds_data) ; // data outputs to ddr in IOB, bit 3(and 7) is clock
wire [9:0] red ;
wire [9:0] green ;
wire [9:0] blue ;
wire [29:0] s_data ;
encode encb (
.clkin (clkin),
.rstin (rstin),
.din (blue_din),
.c0 (hsync),
.c1 (vsync),
.de (de),
.dout (blue)) ;
encode encr (
.clkin (clkin),
.rstin (rstin),
.din (green_din),
.c0 (1'b0),
.c1 (1'b0),
.de (de),
.dout (green)) ;
encode encg (
.clkin (clkin),
.rstin (rstin),
.din (red_din),
.c0 (1'b0),
.c1 (1'b0),
.de (de),
.dout (red)) ;
assign s_data = {red[9], green[9], blue[9], red[8], green[8], blue[8],
red[7], green[7], blue[7], red[6], green[6], blue[6],
red[5], green[5], blue[5], red[4], green[4], blue[4],
red[3], green[3], blue[3], red[2], green[2], blue[2],
red[1], green[1], blue[1], red[0], green[0], blue[0]} ;
reg [29:0] s_data_q;
always @ (posedge clkin) begin
if(SDATAINVERT == "TRUE")
s_data_q <= ~s_data;
else
s_data_q <= s_data;
end
serdes_4b_10to1 serialise (
.clk (clkin),
.clkx5 (clkx5in),
.clkx5not (clkx5notin),
.datain (s_data_q),
.rst (rstin),
.dataout (tmds_data)) ;
endmodule
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