本帖最后由 kenson 于 2019-4-12 17:59 编辑
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0 u+ J w5 N. B" ^9 C( c2 J6 d本编文章将对VGA的RTL代码,封装成AXI Stream,并且在vivado 里用TPG进行测试 本篇文章的VGA RTL代码在【ZYNQ-7000开发之一】基础上修改,封装好的VGA Stream可以方便我们实现视频图像处理 TGP 等的规范说明可以到官网下载最新版本 本文所使用的开发板是Miz702(兼容zedboard)
5 ^6 t5 g/ h xPC 开发环境版本:Vivado 2015.2 Xilinx SDK 2015.2 0 X4 f4 F2 `/ N$ R7 O7 k$ V
其它:VGA显示器 AXI Stream原理首先这里列出axi stream的信号,红框里的是要用到的
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核心的信号是,TVALID,TREADY,TLAST,TUSER TVALID和TREADY握手信号
* W) F6 Y6 o& Q# m在TVALID和TREADY同时有效的时候,数据才有效。对于TPG来说,大部分时间TVALID是有效的,TREADY由我们自己控制。
: ^" K( f3 h2 [/ A0 d: [; iTUSER(SOF,Start Of Frame),代表每一帧的开始。TLAST(EOL,End Of Line),代表每一行的结束。 7 d4 ?8 e' Y# {( _4 I# j7 W5 S( M
这里给出TPG的时序图,比较简洁,要理解之后才好把RTL封装成AXI Stream
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封装AXI Stream打开vivado,建立一个工程(选择zed)选择Tools->Create and Package IP
点击NEXT,选择Create AXI4,如图所示
输入好name和路径后,点击NEXT
按照如下配置
( t" y' t( f ]8 Z. A4 C' V把VGA_AXI_Stream_v1_0.v文件里的代码,修改如下`timescale 1 ns / 1 ps
# |. j! w( z4 x/ f& r2 T+ D
4 ?/ B5 D: T5 X. p) Y6 {0 K+ { module myip_v1_0 #
2 g W4 _5 _' p$ k (+ y$ U& L9 t7 i
// Users to add parameters here
& M b# V. M( L, n
' l' B' v. w, m2 J6 A // User parameters ends
- B! c( G/ K: M t0 d // Do not modify the parameters beyond this line6 E; l: D% ?. d6 @# @1 y! M' B( u6 R
- H; A$ ^& }" E' ~2 D7 n$ a' j' b2 p$ ^) A
// Parameters of Axi Slave Bus Interface S00_AXIS_VGA
/ E# A. a8 F0 f' y) S+ X# d8 E! t parameter integer C_S00_AXIS_VGA_TDATA_WIDTH = 32
5 G( F' f7 n3 ~; k* y' b" D )
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5 M( U+ W9 \6 F$ d# ?9 J // Users to add ports here U4 n3 h( a3 A* G) u" x
input wire clk_25mhz,
9 a5 d7 z8 c* H output wire hsync,
- l6 M; Q; L1 }8 Z" M3 B6 q output wire vsync,6 D1 i5 ~- S$ O% R( X- R, |9 o
output wire [11:0] rgb,) \4 `% V* @, A9 @
output reg LED,, G* N7 L( d0 ^8 J
// User ports ends _5 t: e# @& l. X) @& {: G1 K
// Do not modify the ports beyond this line* r7 ^. S9 J+ E" @7 v+ S1 A" u6 k
0 h- n2 b2 o- Y; f
// Ports of Axi Slave Bus Interface S00_AXIS_VGA1 F1 Y, @( v+ l( a9 j5 }. G
input wire s00_axis_vga_aclk,3 q d$ \6 o; L9 `; y
input wire s00_axis_vga_aresetn,
9 M4 ^6 y4 h: c8 _+ p* R output wire s00_axis_vga_tready,
0 B% R0 c7 ]' l! P$ Q input wire [C_S00_AXIS_VGA_TDATA_WIDTH-1 : 0] s00_axis_vga_tdata,
( \6 P$ v, q# r input wire [(C_S00_AXIS_VGA_TDATA_WIDTH/8)-1 : 0] s00_axis_vga_tstrb,
2 @/ u% b1 G+ B* Y input wire s00_axis_vga_tlast,9 F9 b9 S P' l. J8 T2 k) ~$ m
input wire s00_axis_vga_tvalid,( b/ C3 j# B1 z' C! H
input wire s00_axis_vga_tuser
$ d1 v" U ~* {4 L' q );0 H4 c% Y4 t) |9 r; E
// Instantiation of Axi Bus Interface S00_AXIS_VGA
$ W% n5 W( M+ W1 b myip_v1_0_S00_AXIS_VGA # (
4 L4 n$ M1 t. b$ p8 p0 s .C_S_AXIS_TDATA_WIDTH(C_S00_AXIS_VGA_TDATA_WIDTH)
& j! L8 x% R6 i) l4 S" s ) myip_v1_0_S00_AXIS_VGA_inst (
4 ]5 w7 Q$ N Q3 ^ t .S_AXIS_ACLK(s00_axis_vga_aclk),3 e$ Z% B, R; w$ ^8 }
.S_AXIS_ARESETN(s00_axis_vga_aresetn),
" }7 G( O6 h1 D. ~ Y- m* v4 c .S_AXIS_TREADY(s00_axis_vga_tready),0 G2 l& P2 h x
.S_AXIS_TDATA(s00_axis_vga_tdata),
! V: I0 t1 v3 F .S_AXIS_TSTRB(s00_axis_vga_tstrb),
0 n' Y( s7 v( D+ K# o* Z .S_AXIS_TLAST(s00_axis_vga_tlast),0 s7 {* x0 B; P+ B; W
.S_AXIS_TVALID(s00_axis_vga_tvalid),6 T8 }1 T' n7 ~: L' _
.S_AXIS_TUSER(s00_axis_vga_tuser),7 K# \( Q; n, [: Y2 [ q
.clk (clk_25mhz),/ x, L, @! u2 |" T
.rst_n (s00_axis_vga_aresetn),8 s, ?3 j( O4 q9 E8 }6 ~! d
.video_en (video_en),
. X9 C$ i! [1 `5 h .hsync (hsync), K4 T0 _' G- A$ Z
.vsync (vsync),0 F$ W6 t( ^! H( [: T: H
.pixel_x (pixel_x),5 H% U" U# r) g& {) ~' l4 J& x+ s
.pixel_y (pixel_y) e; y8 c/ L2 z9 Y3 r
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// Add user logic here
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wire [9:0] pixel_x;7 n7 B5 Z) [; x4 x8 K( S' }
wire [9:0] pixel_y;0 v" f8 U3 d# ?' {, ]' K
wire clk_25mhz;% u& Y& Z1 t& G7 R
reg [11:0] rgb_reg;
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6 v/ @& a w. t5 G' W( ~' ] B //显示静态图像640*4802 J3 y3 a3 r" @/ L
reg [23:0] cnt;
* b# w' ~: ~* O% F always @(posedge clk_25mhz or negedge s00_axis_vga_aresetn)% M0 G9 ~) ~3 W1 |0 I' e
if(!s00_axis_vga_aresetn)/ F' L; Y4 x+ @/ M$ K5 C
begin
' n; F3 D- Y: H0 H cnt <= 0;" K% }5 I# L; D5 W, f4 m# C- F" u( {
led <= 0;
: e4 w8 F8 C, K3 y/ Z* q4 i end
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begin
! D7 D t5 D0 o- y# p5 J# ~ cnt <= cnt + 1'b1;
& _4 l F. j9 D+ ~1 z1 O2 O if(cnt == 24'd12500000)& f8 w$ E( O" @, a6 ^
begin
$ _* N( m( M7 S ]3 y: E cnt <= 24'b0;6 s/ |! \; y) _. h# ^ `
led <= ~led;; S9 V. @, x- m/ g8 ~
end 7 g& s. p% i3 E
end / u2 |0 Q$ t9 d1 W
always @ (posedge clk_25mhz or negedge s00_axis_vga_aresetn)4 e! @+ }" v8 t- \! ?' [! |
if(!s00_axis_vga_aresetn)
3 b7 P) ?1 T, b9 J begin( x2 X" G3 ]* n% `
rgb_reg <= 12'b0;
0 W0 A) ]2 O3 x$ z- q/ `+ v end
' q) k. V+ p# M2 m0 k; a6 D. ` else if(s00_axis_vga_tvalid == 1'b1 && s00_axis_vga_tready == 1'b1)
& D9 r- _3 }' f( A* F begin //显示图像 8 O0 j, K& w7 T; V8 Z- u0 Q/ ~% ~
rgb_reg[3:0] <= s00_axis_vga_tdata[7:4];
9 m4 w& ]8 o, ` rgb_reg[7:4] <= s00_axis_vga_tdata[15:12];) l4 F4 ^- S- v; f3 O/ {0 g6 M# H
rgb_reg[11:8] <= s00_axis_vga_tdata[23:20];
# `& o1 ^7 J- L9 P" t: H end
v" C( q* w1 Y. ] /* 7 j* w9 A$ |, D
always @ (posedge clk_25mhz or negedge s00_axis_vga_aresetn)
: L6 Q+ k* m0 P& O: i8 c if(!s00_axis_vga_aresetn)
* F* h. |# M: v8 M1 \% u# q begin
$ D; r' B! ?; b' U; C/ G address_sig <= 19'b0;
/ Y6 w* r! z- H end ! P- u c2 s) r. Q" U) |% ^! g. \
else
+ a: ?; l L3 [% T; ]# Z: B begin
1 @9 ~' v- B; |+ p) X2 L2 R2 ` if(pixel_x>=0 && pixel_x<= 639 && pixel_y>=0 && pixel_y<=479)
- g% H) t) e4 k address_sig = (pixel_x + 640*pixel_y);( j* h: z! ?' Q+ V0 ]
end 9 B. g; f6 @" d
*/
& Y# C8 n0 w4 o& H5 H- r //////////////////////////////////////////////////////////////
, C" E5 |$ q/ ?# F assign rgb = (video_en == 1'b1) ? rgb_reg:12'b0; 2 I# j7 W5 r1 I2 h$ i$ h
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// User logic ends
0 M- X2 i1 A% q6 B1 A endmodule3 m, }) E& m: |# Q T+ o8 a
把VGA_AXI_Stream_v1_0_S00_AXI_VgA.v文件里的代码,修改如下
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1 u$ I: y5 F* f! S6 w// Users to add ports here
& z) Q, A5 `# j3 D1 C0 e input wire clk,5 u' [1 D1 C) ~4 j1 Z2 n) J; y
input wire rst_n,
2 v: T% ^4 ?' k# U output wire video_en,' K# O7 }- U2 U; x6 I
output reg hsync,
u8 [7 A5 ?. L: B+ f' O4 [( ~ output reg vsync,
+ b. L1 |7 S$ h. {/ O% P, L output wire [9:0] pixel_x,* ?+ J8 N. T9 d
output wire [9:0] pixel_y,
( A( E4 z" c$ Y // User ports ends
' }- t9 d9 T3 t, M3 o // Do not modify the ports beyond this line
: a! N% m, C e+ k- A
E. ~6 h' G, G2 X; z1 x6 i // AXI4Stream sink: Clock' U9 k6 S/ Z7 _2 x f, E
input wire S_AXIS_ACLK,
* G4 T3 N( t/ r g // AXI4Stream sink: Reset
- Z! J( C) @, I9 g D q1 T A input wire S_AXIS_ARESETN,
0 l$ B2 z4 b9 i. S* b // Ready to accept data in
- C6 \8 `# q& y* R! d4 ^: n output wire S_AXIS_TREADY,/ o" D" S& H7 R
// Data in7 c# c# }- { ?7 x8 O: ~
input wire [C_S_AXIS_TDATA_WIDTH-1 : 0] S_AXIS_TDATA,3 S# i8 ^2 C. }- Y) o8 r; Z! q% z
// Byte qualifier
; a. K) P6 H8 `$ R8 d) g input wire [(C_S_AXIS_TDATA_WIDTH/8)-1 : 0] S_AXIS_TSTRB,
$ `0 r# @) J5 C. F* J P2 o // Indicates boundary of last packet
- V2 v9 c& k" y. E+ @9 F input wire S_AXIS_TLAST,) L/ ~. b0 w+ ~$ P( A( f
// Data is in valid
[4 T/ H! m( Q: W: L. p input wire S_AXIS_TVALID,
v. |8 P- w- ?( _& `3 b input wire S_AXIS_TUSER$ I9 _6 h9 S& n" q6 V( z7 j
);
' _) E v/ f+ \+ y, | // function called clogb2 that returns an integer which has the
7 ], W! f& h% F5 w8 j2 u // value of the ceiling of the log base 2.9 V' R& i9 u, V: M
function integer clogb2 (input integer bit_depth);6 S4 M& E7 o, N! u. A0 X
begin
6 ^; M+ u$ a* i( x7 O for(clogb2=0; bit_depth>0; clogb2=clogb2+1)6 r6 ~) ~- a6 j8 v) A5 x) v. \
bit_depth = bit_depth >> 1;
8 K3 N0 c. X" e# ^/ q end
+ S/ L6 a8 d1 o4 g9 O" D endfunction; ^% k3 m! X4 v8 a A, v
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// Total number of input data.
/ ^/ Y+ K% ?0 s localparam NUMBER_OF_INPUT_WORDS = 8;
$ s/ i. L2 I; W2 V8 M2 D4 G // bit_num gives the minimum number of bits needed to address 'NUMBER_OF_INPUT_WORDS' size of FIFO./ J" ?1 a, @ L
localparam bit_num = clogb2(NUMBER_OF_INPUT_WORDS-1);
4 n7 h2 h9 j3 S& o; A4 {2 k // Define the states of state machine5 P4 K2 m/ m, Z1 }) k1 v6 R
// The control state machine oversees the writing of input streaming data to the FIFO,& `' H' F. J) }* i3 Q. H5 @- N
// and outputs the streaming data from the FIFO1 \$ a! h p$ a
parameter [1:0] IDLE = 1'b0, // This is the initial/idle state
' X' u: q. e- k: R q9 ?2 n5 b/ d' l
WRITE_FIFO = 1'b1; // In this state FIFO is written with the
; N- F- A3 Q1 P3 D+ r7 B; G1 k // input stream data S_AXIS_TDATA 3 L0 Q8 Z, h3 @7 n
wire axis_tready;) B* X" {2 }/ o5 n6 z9 Q
// State variable; N9 L7 C% B% h& ?$ @1 f
reg mst_exec_state; - D# y0 S- }) c$ g0 P
// FIFO implementation signals
9 c) X3 |! B4 b$ e; z1 D2 Q genvar byte_index;
& t8 X# D" p* J; u. V$ _9 C // FIFO write enable
# ^- i# D% p, b( c. \/ S( r wire fifo_wren;
1 J! x0 t5 j7 t2 }. p // FIFO full flag
+ k% X4 k& d- s2 x reg fifo_full_flag;
3 S9 d6 _6 c( w' P1 K; N // FIFO write pointer* u* m# ]' A+ C* W: [
reg [bit_num-1:0] write_pointer;' W+ Q9 a. d/ D! u
// sink has accepted all the streaming data and stored in FIFO) C9 o2 i" O7 m0 k0 E1 c
reg writes_done;
$ z1 Y' e3 p1 K$ B3 w C. e // I/O Connections assignments( @; @3 B o8 g
( ~ T3 y3 `" L2 ^/ Y assign S_AXIS_TREADY = axis_tready;4 l3 b! Y( r6 d4 m
// Control state machine implementation
3 O+ ]- @1 G- w. n6 W5 T* S always @(posedge S_AXIS_ACLK) ( z8 d: L" R+ T' b2 s/ e
begin 4 W6 R d9 ~3 O+ t+ _) q
if (!S_AXIS_ARESETN) ! R" l% {- G8 _, k( A1 e
// Synchronous reset (active low)
3 M6 `, B7 J/ T- D begin
: D* G) Q6 l# a& d6 o2 x mst_exec_state <= IDLE;
( g: k6 i$ |- H1 p7 S% q end
" B9 L# W2 n: o: Z* d8 v! L) K else: N. r- w* B( u9 u0 L9 P
case (mst_exec_state)5 T% g, g: G6 x. `, U8 E- [) \8 ^
IDLE:
2 {( d& ]6 C4 l2 R% k3 z // The sink starts accepting tdata when / C0 u c( n8 \7 {3 h# Q* ^0 ~
// there tvalid is asserted to mark the
6 |. k" t9 q% L // presence of valid streaming data
, O' {! D2 Q6 N. B2 o: b( g& n3 O/ j if (S_AXIS_TVALID)
. b4 y2 @7 Z6 c" H6 W' q) w begin5 P; Z/ @0 g4 U: o: L9 c9 _3 `! D q
mst_exec_state <= WRITE_FIFO;8 u8 o, ~# {3 t, z; B2 X. ~
end* Y5 n; t8 m( }/ t. D; E: x
else; E0 s4 j2 ^) l: Y& y
begin* b+ h1 l8 b5 Y* [
mst_exec_state <= IDLE;; L+ C1 p6 ^. n3 t
end
( @9 Y. n5 t4 @ WRITE_FIFO: 5 v# A. p6 r+ n+ A1 W- j
// When the sink has accepted all the streaming input data,, r9 H+ Q( S! m$ M5 c+ Y
// the interface swiches functionality to a streaming master
2 S5 X* j3 s# ]" x5 x$ w if (writes_done), U' u3 x h+ q" Z
begin
# d8 m+ ~# W% B- V) ?! B mst_exec_state <= IDLE;
6 C& R' X: f1 n0 c" p end8 B- D' D7 h# p% t. R) a
else# p7 v; i9 o+ d2 I; C+ u9 I% j
begin& ^6 I% ~- p5 {5 m. F
// The sink accepts and stores tdata
5 F: B/ ^ k1 H) T! I* v0 k // into FIFO: M+ G" J" b" ]5 b8 ?+ \, v
mst_exec_state <= WRITE_FIFO;& u, R' n( }+ r/ p' i. ]
end
* I/ ]2 b( l) e, c/ x! g9 X8 F, J% o4 Q# u4 R. O
endcase9 C9 x5 y4 w/ v: T
end
6 j) s3 `; U1 z% I& C0 Z4 D // AXI Streaming Sink
4 k; n$ V" n/ f4 ?% j8 o" T9 u // & V& `# b) ?9 N7 l0 }7 j1 L6 s2 R
// The example design sink is always ready to accept the S_AXIS_TDATA until
+ A) k+ x g% ~' c // the FIFO is not filled with NUMBER_OF_INPUT_WORDS number of input words.
' i7 j1 r7 z7 I( U; M, g //assign axis_tready = ((mst_exec_state == WRITE_FIFO) && (write_pointer <= NUMBER_OF_INPUT_WORDS-1)
4 `) }. x3 n. h# N) }7 L5 ~$ E8 K. s& `( v5 |
assign axis_tready =( (pixel_x>=0 && pixel_x<= 639 && pixel_y>=0 && pixel_y<=479) );% @8 l7 I% i# r- i, |
5 P- }& P" z1 D: E. |4 N( k( I
always@(posedge S_AXIS_ACLK)
' @- K3 R: d2 ]# S$ | _& t begin
, u. X3 x, f8 U6 T3 y2 p if(!S_AXIS_ARESETN)
, H: R9 r" n, N1 [1 C begin: E0 X" g6 M4 ~8 q2 i1 P% K3 A4 n% R
write_pointer <= 0;
2 @7 m! z* M0 _. G writes_done <= 1'b0;2 { T7 D8 W7 O5 s, K, k
end # ~+ O' Y/ f" |( [2 G$ S
else$ o0 O. g9 p/ O2 U( F: J0 R
if (write_pointer <= NUMBER_OF_INPUT_WORDS-1)
" I* v# B; x2 l begin# i6 |6 I% Q6 H" c8 C
if (fifo_wren): ^ ], m6 O7 r2 R$ n
begin. v j" z3 M/ ^% I: U
// write pointer is incremented after every write to the FIFO
' }" W5 {; ?2 `6 H/ I) e; ? // when FIFO write signal is enabled.
* R1 q6 l2 s) Y! i _$ v write_pointer <= write_pointer + 1;7 ]% C# n& L/ J6 |. w2 ^! W1 u
writes_done <= 1'b0;
8 C) z8 v! k' e: n! F5 O end5 e6 F) L8 M* [% @6 `) L; e5 U
if ((write_pointer == NUMBER_OF_INPUT_WORDS-1)|| S_AXIS_TLAST)5 ~- a* A$ y, U( \$ b
begin
- u% f$ S) t3 W+ l/ W9 ~- u$ X // reads_done is asserted when NUMBER_OF_INPUT_WORDS numbers of streaming data 5 T) M! @$ ?) z4 h7 ]; C
// has been written to the FIFO which is also marked by S_AXIS_TLAST(kept for optional usage).
* |' ]) J% L7 B7 J$ k3 Y) i writes_done <= 1'b1;7 T1 X' w) m, t0 |: l
end
* i9 m- P% B6 @% V end
8 K$ A6 m* W4 X, y' |0 J0 K end
5 E) p/ L2 @( w: V- J( K
. B9 Q' Y/ I4 w! e% g0 t4 n // FIFO write enable generation
- K7 r2 [% e1 u+ h2 q+ j assign fifo_wren = S_AXIS_TVALID && axis_tready;; _1 _* b7 v0 m1 e( c& |0 h
. }- a5 q( T: t8 [( z. v! ?
// FIFO Implementation& o( Q z+ Z% \+ }) t* h P
generate m; J& X5 g q o2 P
for(byte_index=0; byte_index<= (C_S_AXIS_TDATA_WIDTH/8-1); byte_index=byte_index+1)* o4 @& Y* b' ^! w
begin:FIFO_GEN
7 n( c8 P- z4 R8 ~
1 A4 P$ J( Y! I7 v! R9 m reg [(C_S_AXIS_TDATA_WIDTH/4)-1:0] stream_data_fifo [0 : NUMBER_OF_INPUT_WORDS-1];
+ Z0 W3 }6 v' Q, n' A5 ]+ M0 ^0 Y& _6 t/ n2 v
// Streaming input data is stored in FIFO
: n% ~0 ]- i. }% Q( f% c
) S& H8 t& r6 }% l' ~ always @( posedge S_AXIS_ACLK )0 N3 s! ~& m! F" [: ~8 ]' _! u& }
begin
( m( T2 u- |' r3 q' s if (fifo_wren)// && S_AXIS_TSTRB[byte_index]); u$ Y Y/ f1 }) A) G* n; B
begin% @3 m. y1 [" p1 g- }% v" I
stream_data_fifo[write_pointer] <= S_AXIS_TDATA[(byte_index*8+7) -: 8];
2 h9 y! J& a& O& f! O3 Z end
; W7 }- _0 u3 q$ Q' m3 M' ? end * A9 s! S% u8 Q
end - U5 ] y- O1 M5 t: H# t- v
endgenerate
/ T2 S9 O% s$ s+ G- A% w: F9 @: x
// Add user logic here
$ m1 `2 z0 t1 \% v8 {
5 {! B1 s3 { w7 R! {" ` reg [9:0] pixel_cnt;2 q6 i* E2 B/ ^5 _5 e6 F' \
reg [9:0] line_cnt;( d. X& o* q9 t" S2 L
reg v_video_en;2 O: a1 {0 V5 Y4 v- S) y* }- W
reg h_video_en;
/ k% P( E$ l, x4 d- m+ g" m
1 W. P1 w+ f s1 Y always @(posedge clk or negedge rst_n)
2 z ]4 c4 S8 E; _/ q if(!rst_n)
! b3 S+ ]+ F8 M2 L2 ] begin
+ n5 q t5 e& k2 o2 ] pixel_cnt <= 10'b0;& c; q, |7 y! Z/ H; \4 ~# } F* B
end- Z) P9 y* o$ I; c0 B2 y
else& O- M, [' Y/ n1 `, F$ m6 ]. ^
begin
) h9 j2 l, A; N! B pixel_cnt <= pixel_cnt + 1'b1;
6 P% |. c7 @- f$ o' U$ [ if(pixel_cnt == 10'd799 || S_AXIS_TUSER == 1'b1)
c$ o y. N' s* }* u# Z8 @/ ~4 e begin: z2 v* C* ^' y* J8 G0 P& E* R" }
pixel_cnt <= 10'b0;6 A4 K" l. ]1 u( _
end
4 F& V$ [) |/ A0 ?0 Y end
9 P* w6 y: R" |, }9 A7 I
3 T0 o' W* Y2 f/ M/ Q2 O( s. X! B& E! L& |5 k
always @(posedge clk or negedge rst_n)
( V& W6 x+ g' i C" v if(!rst_n)' T. ~0 f1 a& A2 H6 S" B
begin+ |+ U+ h. s6 {7 {/ Y+ V. B$ I
h_video_en <= 1'b1;* P# U- P1 O. \" C2 @4 [
hsync <= 1'b1;. u# R* v; S& x5 m4 {9 `
end& p! [/ Z* b+ ^( F/ N3 V, e- q2 V
else
. q$ ?, R$ x* p+ \, r5 @8 P/ \# _ begin+ e3 m: f+ n, u) h/ T( u
case (pixel_cnt)
+ b$ \4 J+ o# i( [ 10'd0:
& }8 F% F, [# u9 X6 J begin) H7 X) E# n% q
h_video_en <= 1'b1;
6 d2 b a. L7 {. G0 x end
* ~7 C- T X7 a( M 10'd639:
! C) m3 J5 p' N% E begin* H4 a7 ~: j: y7 R6 {
h_video_en <= 1'b0;/ u7 G7 V% F! L2 l9 a
end
( ~5 H6 i& k3 o* _ 10'd655:
4 b9 k' D- D" [- g( M' E* p* I$ p4 l begin
% B9 o9 I( y: M% l8 ` t hsync <= 1'b0;7 {; y4 M7 k9 J% I
end
' r2 D& q. b. d6 }- d. b 10'd751:
1 F. r9 C0 y* L begin- ~$ g1 n" ~4 u5 \" ~9 b- \
hsync <= 1'b1;
+ Q- ~# h% O- o' t end : o" r& f* s5 z. I
endcase. u; _6 z6 D' y. L, R$ B
end( t) }5 p7 L3 M# X" G, }, t
. O' ] C: \, f
+ X. c4 d/ j- b# g$ {( r+ S always @(posedge clk or negedge rst_n)" z$ b, b; b( P# |
if(!rst_n)
: V9 C, ~' w9 |- p; r; W# I- F begin7 x: W1 Y8 J$ j, G- k' B6 F
line_cnt <= 10'b0;- f/ W0 d0 _3 f o$ |& L2 a) L
end _1 `6 o/ ~' `2 Z9 z" m6 `
else 7 m) d# W' X/ G+ |5 [
begin9 a; V. q" [) F* G Y' v- Q% N
if(pixel_cnt <= S_AXIS_TLAST) //pixel_cnt == 10'd799
; p' ^/ x" M1 r3 O5 K0 B5 M1 z& Y begin
8 [, ^& e4 I0 V9 Q line_cnt <= line_cnt + 1'b1;
% N0 [3 S4 W: v; X4 K- a0 l end 8 l K* E) X2 Y W
6 `# e4 O# I% t8 `" v if(line_cnt == 10'd524)
. _& J% c b5 l1 l begin
6 s( W) I5 g' e! I line_cnt <= 10'b0;8 T- H. }+ }8 l3 ?% j7 U0 N
end
% d$ V3 \* `8 v3 G- |: w if(S_AXIS_TUSER == 1'b1)
1 Y6 \3 W" Y* R" Q* w begin7 O+ u0 L, I' J) \
line_cnt <= 10'b0; + Q! B' ], X( M- c! |$ X* S+ i
end; {8 k, H" Z: a
end2 v) Z0 Y' W( |/ G+ p4 A. o
0 s' q* s' x e9 j/ \9 Z5 v always @(posedge clk or negedge rst_n)
. ^+ ~7 K( W9 [ r7 b% W if(!rst_n)& J* k, Z/ q/ e- t
begin
8 I1 A7 D2 Y" Z/ [6 o" Q* ]5 c' b v_video_en <= 1'b1;* a4 Y1 X ?4 `; I; h
vsync <= 1'b1;% m7 ?2 K) _ m! }+ u/ d
end
- p! _, T9 g" A# c else
8 u: D4 v% E9 |: E4 m& e9 F begin
; T0 P0 n- }% x3 n case(line_cnt)) G4 L) q1 z# t# K3 c: K* ]1 O! j
10'd0:, s( e% S2 _* i% |: z
begin
# ~0 [. v, Y( k# c E* [ v_video_en <= 1'b1; p( |4 V# ?2 C3 x, W
end # {+ W3 w f: e2 {. b- l1 `7 q
10'd479:
0 _& L' X4 l& ]) ]! X begin
; B* p+ a) a+ }2 o& U. z v_video_en <= 1'b0;
0 u6 p; Q6 q! d( W end
9 M/ J. k8 T: a# P2 }% m 10'd489:
$ y* S, t; R7 P7 P begin
$ d+ j3 p3 R; X$ { f2 E vsync <= 1'b0;
( y* d1 {4 r" o1 k3 m end
1 y1 S; Z/ v; R' M 10'd491:
- E# p' J/ j2 }( J begin0 u f+ z& J+ q
vsync <= 1'b1;
; w' i$ N8 Q: Q' d" W3 [! x* x end
6 Z! W- }6 k/ \ endcase
( u4 [( o, I* a. l8 L# H end $ t$ K# O$ W3 w2 {; u! J5 H
4 G" q- p* `, `3 i* q1 u; E9 ~: z assign pixel_x = pixel_cnt;
) p7 Y5 H6 U& f# L assign pixel_y = line_cnt;4 q9 x+ m$ z9 Q0 h0 w
" T4 C( r8 P- [/ d; C assign video_en = ((h_video_en == 1'b1) && (v_video_en == 1'b1));
' Q v+ G9 z f# r // User logic ends
/ o W: L; U. _7 c! R3 u
# t0 u; Q- T/ B2 q1 J7 o3 U endmodule
, |; B& M* O1 g# R% h- b
8 `) h0 M8 u1 Y. _8 Q: k8 n' i2 x
. w6 P( P2 T7 F V2 L% p
|