module ov7670_config(
clk ,
rst_n ,
config_en ,
rdy ,
rdata ,
rdata_vld ,
wdata ,
addr ,
wr_en ,
rd_en ,
cmos_en ,
pwdn
);
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parameter DATA_W = 8;
parameter RW_NUM = 2;
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4 ?5 a& e0 K, ?3 f input clk ; //50Mhz
input rst_n ;
input config_en;
input rdy ;
input [DATA_W-1:0] rdata ;
input rdata_vld;
0 K6 u: \9 L4 h& J z/ ^+ a output[DATA_W-1:0] wdata ;
output[DATA_W-1:0] addr ;
1 |5 U7 p" p: r7 P+ w" z output cmos_en ;
output wr_en ;
output rd_en ;
output pwdn ;
reg [DATA_W-1:0] wdata ;
reg [DATA_W-1:0] addr ;
reg cmos_en ;
reg wr_en ;
reg rd_en ;
. x; s6 Q3 k, u reg [8 :0] reg_cnt ;
wire add_reg_cnt/*synthesis keep*/;
wire end_reg_cnt/*synthesis keep*/;
reg flag_add ;
reg [17:0] add_wdata/*synthesis keep*/;
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reg [ 1:0] rw_cnt ;
wire add_rw_cnt ;
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assign pwdn = 0;
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0 l9 B- \' L: j4 ?4 h$ T/ p `include "ov7670_para.v"
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always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
reg_cnt <= 0;
end
else if(add_reg_cnt)begin
if(end_reg_cnt)
reg_cnt <= 0;
else
reg_cnt <= reg_cnt + 1;
end
end
7 D& t1 q8 g0 @0 o assign add_reg_cnt = end_rw_cnt;
assign end_reg_cnt = add_reg_cnt && reg_cnt==REG_NUM-1;
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always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
rw_cnt <= 0;
end
else if(add_rw_cnt) begin
if(end_rw_cnt)
rw_cnt <= 0;
else
rw_cnt <= rw_cnt + 1;
end
end
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assign add_rw_cnt = flag_add && rdy;
assign end_rw_cnt = add_rw_cnt && rw_cnt==RW_NUM-1;
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always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
flag_add <= 1'b0;
end
else if(config_en)begin
flag_add <= 1'b1;
end
else if(end_reg_cnt)begin
flag_add <= 1'b0;
end
end
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//cmos_en
always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
cmos_en <= 1'b0;
end
else if(end_reg_cnt)begin
cmos_en <= 1'b1;
end
end
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% t) [9 L; t& y% I [% F' F V //add_wdata
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always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
wdata <= 8'b0;
end
else begin
wdata <= add_wdata[7:0];
end
end
! v9 u6 K( C/ `9 R$ R always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
addr <= 8'b0;
end
else begin
addr <= add_wdata[15:8];
end
end
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3 O. C9 X; @! d2 I //wr_en
always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
wr_en <= 1'b0;
end
else if(add_rw_cnt && rw_cnt==0 && add_wdata[16])begin
wr_en <= 1'b1;
end
else begin
wr_en <= 1'b0;
end
end
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' r3 E: Y/ Y6 l9 n; r always @(posedge clk or negedge rst_n)begin
if(rst_n==1'b0)begin
rd_en <= 1'b0;
end
else if(add_rw_cnt && rw_cnt==1 && add_wdata[17])begin
rd_en <= 1'b1;
end
else begin
rd_en <= 1'b0;
end
end
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endmodule
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/1 
发表于 2019-12-17 11:35
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