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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' l3 c- \. z& ]! s input clk ; //50Mhz
input rst_n ;
input config_en;
input rdy ;
input [DATA_W-1:0] rdata ;
input rdata_vld;
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output[DATA_W-1:0] wdata ;
output[DATA_W-1:0] addr ;
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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 ;
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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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`include "ov7670_para.v"
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5 p* U9 N* H2 B4 G 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
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assign add_reg_cnt = end_rw_cnt;
assign end_reg_cnt = add_reg_cnt && reg_cnt==REG_NUM-1;
8 r( H+ d- q g4 _ 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
9 O% J5 d( S2 H: s) u 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
" _. {3 I B/ W
//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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. ]1 k4 u! ?8 f- m //add_wdata
& U& r$ R6 u8 x" n" ^7 Z 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
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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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//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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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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/ c# @$ B2 r5 e' k: ^) k4 Yendmodule
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