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EEPROM
EEPROM存储结构
以AT24C08C为例
容量：1024 x 8 bit （8k）
由64 pege组成，1 page 由16 byte组成
数据地址：10bit，
8bit IIC 数据地址 + Device Adress的bit2、bit1组成的page地址，共10bit数据地址，可任意读写AT24C08C的1024 byte存储空间（Device Adress 如下图所示）
具体可看I2C中24C02从地址设置 区分器件地址和 寄存器地址
接口：IIC ，2-wire serial interface
控制方式采取：按字节写入和随机读出
Atmel官网链接，可下载AT24C08C手册和Verilog仿真模型
代码实现功能
写入AT24C08C 128 byte EDID信息，读出并对比写入的数据，验证对否正确写入
module EEPROM_IIC_TOP(input sys_clk , //系统时钟 50MHzinput sys_rst_n , //系统复位//eeprom interfaceoutput iic_scl , //eeprom的时钟线sclinout iic_sda , //eeprom的数据线sda//user interfaceoutput led //led显示
);//parameter define
parameter SLAVE_ADDR = 7'b1010000 ; //器件地址(SLAVE_ADDR)
parameter BIT_CTRL = 1'b0 ; //字地址位控制参数(16b/8b)
parameter CLK_FREQ = 26'd50_000_000; //i2c_dri模块的驱动时钟频率(CLK_FREQ)
parameter I2C_FREQ = 18'd250_000 ; //I2C的SCL时钟频率
parameter L_TIME = 17'd125_000 ; //led闪烁时间参数//wire define
wire dri_clk ; //I2C操作时钟
wire i2c_exec ; //I2C触发控制
wire [15:0] i2c_addr ; //I2C操作地址
wire [ 7:0] i2c_data_w; //I2C写入的数据
wire i2c_done ; //I2C操作结束标志
wire i2c_ack ; //I2C应答标志 0:应答 1:未应答
wire i2c_rh_wl ; //I2C读写控制wire [ 7:0] i2c_data_r; //I2C读出的数据
wire rw_done ; //E2PROM读写测试完成
wire rw_result ; //E2PROM读写测试结果 0:失败 1:成功 //*****************************************************
//** main code
//*****************************************************//e2prom读写测试模块
e2prom_rw u_e2prom_rw(.clk (dri_clk ), //时钟信号.rst_n (sys_rst_n ), //复位信号//i2c interface.i2c_exec (i2c_exec ), //I2C触发执行信号.i2c_rh_wl (i2c_rh_wl ), //I2C读写控制信号.i2c_addr (i2c_addr ), //I2C器件内地址.i2c_data_w (i2c_data_w), //I2C要写的数据.i2c_data_r (i2c_data_r), //I2C读出的数据.i2c_done (i2c_done ), //I2C一次操作完成.i2c_ack (i2c_ack ), //I2C应答标志 //user interface.rw_done (rw_done ), //E2PROM读写测试完成.rw_result (rw_result ) //E2PROM读写测试结果 0:失败 1:成功
);
//i2c驱动模块
i2c_dri #(.SLAVE_ADDR (SLAVE_ADDR), //EEPROM从机地址.CLK_FREQ (CLK_FREQ ), //模块输入的时钟频率.I2C_FREQ (I2C_FREQ ) //IIC_SCL的时钟频率
) u_i2c_dri(.clk (sys_clk ), .rst_n (sys_rst_n ), //i2c interface.i2c_exec (i2c_exec ), //I2C触发执行信号.bit_ctrl (BIT_CTRL ), //器件地址位控制(16b/8b).i2c_rh_wl (i2c_rh_wl ), //I2C读写控制信号.i2c_addr (i2c_addr ), //I2C器件内地址.i2c_data_w (i2c_data_w), //I2C要写的数据.i2c_data_r (i2c_data_r), //I2C读出的数据.i2c_done (i2c_done ), //I2C一次操作完成.i2c_ack (i2c_ack ), //I2C应答标志.scl (iic_scl ), //I2C的SCL时钟信号.sda (iic_sda ), //I2C的SDA信号//user interface.dri_clk (dri_clk ) //I2C操作时钟
);
/led指示模块
led_alarm
#(.L_TIME(L_TIME ) //控制led闪烁时间
)
u_led_alarm(.clk (dri_clk ), .rst_n (sys_rst_n ), .rw_done (rw_done ), .rw_result (rw_result ),.led (led )
);
endmodulemodule e2prom_rw(input clk , //时钟信号，I2C操作时钟，1MHz，250kHz * 4input rst_n , //复位信号//i2c interfaceoutput reg i2c_rh_wl , //I2C读写控制信号output reg i2c_exec , //I2C触发执行信号output reg [15:0] i2c_addr , //I2C器件内地址output wire [ 7:0] i2c_data_w , //I2C要写的数据input [ 7:0] i2c_data_r , //I2C读出的数据input i2c_done , //I2C一次操作完成input i2c_done , //I2C一次操作完成input i2c_ack , //I2C应答标志//user interfaceoutput reg rw_done , //E2PROM读写测试完成output reg rw_result //E2PROM读写测试结果 0:失败 1:成功
);//parameter define
//EEPROM写数据需要添加间隔时间,读数据则不需要
parameter WR_WAIT_TIME = 14'd5000; //写入间隔时间
parameter MAX_BYTE = 16'd128 ; //读写测试的字节个数//reg define
reg [1:0] flow_cnt ; //状态流控制
reg [13:0] wait_cnt ; //延时计数器reg [7:0] edid_info [127:0] ;//存储128 byte EDID 信息
reg [7:0] i2c_data_cnt;initial begin
$readmemh("E:/work/vivado_project/EEPROM_IIC/edid.txt", edid_info , 0, 127);
end
//*****************************************************
//** main code
//*****************************************************
assign i2c_data_w = (i2c_addr == MAX_BYTE || i2c_rh_wl) ? 8'd0 : edid_info[i2c_data_cnt];//EEPROM读写测试,先写后读，并比较读出的值与写入的值是否一致
always @(posedge clk or negedge rst_n) beginif(!rst_n) beginflow_cnt <= 2'd0;i2c_rh_wl <= 1'b0;i2c_exec <= 1'b0;i2c_addr <= 16'd0;i2c_data_cnt <= 8'd0;wait_cnt <= 14'd0;rw_done <= 1'b0;rw_result <= 1'b0; endelse begini2c_exec <= 1'b0;rw_done <= 1'b0;case(flow_cnt)2'd0 : begin wait_cnt <= wait_cnt + 1'b1; //延时计数if(wait_cnt == WR_WAIT_TIME - 1'b1) begin //EEPROM写操作延时完成wait_cnt <= 1'b0;if(i2c_addr == MAX_BYTE) begin //256个字节写入完成i2c_addr <= 1'b0;i2c_rh_wl <= 1'b1;flow_cnt <= 2'd2;endelse beginflow_cnt <= flow_cnt + 1'b1;i2c_exec <= 1'b1;endendend2'd1 : beginif(i2c_done == 1'b1) begin //EEPROM单次写入完成flow_cnt <= 2'd0;i2c_addr <= i2c_addr + 1'b1; //地址0~255分别写入i2c_data_cnt <= i2c_data_cnt + 1'b1; //数据0~255end end2'd2 : begin flow_cnt <= flow_cnt + 1'b1;i2c_exec <= 1'b1;end 2'd3 : beginif(i2c_done == 1'b1) begin //EEPROM单次读出完成//读出的值错误或者I2C未应答,读写测试失败if((edid_info[i2c_addr] != i2c_data_r) || (i2c_ack == 1'b1)) beginrw_done <= 1'b1;rw_result <= 1'b0;endelse if(i2c_addr == MAX_BYTE - 1'b1) begin //读写测试成功rw_done <= 1'b1;rw_result <= 1'b1;end else beginflow_cnt <= 2'd2;i2c_addr <= i2c_addr + 1'b1;endend enddefault : ;endcase end
end
endmodulemodule i2c_dri
#(parameter SLAVE_ADDR = 7'b1010000 , //EEPROM从机地址parameter CLK_FREQ = 26'd50_000_000, //模块输入的时钟频率parameter I2C_FREQ = 18'd250_000 //IIC_SCL的时钟频率
)
( input clk , //系统时钟 50MHz input rst_n , //i2c interface input i2c_exec , //I2C触发执
input bit_ctrl , //字地址位控制(16b/8b)input i2c_rh_wl , //I2C读写控制信号input [15:0] i2c_addr , //I2C器件内地址input [ 7:0] i2c_data_w , //I2C要写的数据output reg [ 7:0] i2c_data_r , //I2C读出的数据output reg i2c_done , //I2C一次操作完成output reg i2c_ack , //I2C应答标志 0:应答 1:未应答output reg scl , //I2C的SCL时钟信号inout sda , //I2C的SDA信号//user interface output reg dri_clk //驱动I2C操作的驱动时钟); //localparam define
localparam st_idle = 8'b0000_0001; //空闲状态
localparam st_sladdr = 8'b0000_0010; //发送器件地址(slave address)
localparam st_addr16 = 8'b0000_0100; //发送16位字地址
localparam st_addr8 = 8'b0000_1000; //发送8位字地址
localparam st_data_wr = 8'b0001_0000; //写数据(8 bit)
localparam st_addr_rd = 8'b0010_0000; //发送器件地址读
localparam st_data_rd = 8'b0100_0000; //读数据(8 bit)
localparam st_stop = 8'b1000_0000; //结束I2C操作
//reg define
reg sda_dir ; //I2C数据(SDA)方向控制
reg sda_out ; //SDA输出信号
reg st_done ; //状态结束
reg wr_flag ; //写标志
reg [ 6:0] cnt ; //计数
reg [ 7:0] cur_state ; //状态机当前状态
reg [ 7:0] next_state; //状态机下一状态
reg [15:0] addr_t ; //地址
reg [ 7:0] data_r ; //读取的数据
reg [ 7:0] data_wr_t ; //I2C需写的数据的临时寄存
reg [ 9:0] clk_cnt ; //分频时钟计数//wire define
wire sda_in ; //SDA输入信号
wire [8:0] clk_divide ; //模块驱动时钟的分频系数//*****************************************************
//** main code
//*****************************************************//SDA控制
assign sda = sda_dir ? sda_out : 1'bz; //SDA数据输出或高阻
assign sda_in = sda ; //SDA数据输入
assign clk_divide = (CLK_FREQ/I2C_FREQ) >> 2'd2;//模块驱动时钟的分频系数
//生成I2C的SCL的四倍频率的驱动时钟用于驱动i2c的操作
always @(posedge clk or negedge rst_n) beginif(!rst_n) begindri_clk <= 1'b0;clk_cnt <= 10'd0;endelse if(clk_cnt == clk_divide[8:1] - 1'd1) beginclk_cnt <= 10'd0;dri_clk <= ~dri_clk;endelseclk_cnt <= clk_cnt + 1'b1;
end//(三段式状态机)同步时序描述状态转移
always @(posedge dri_clk or negedge rst_n) beginif(!rst_n)cur_state <= st_idle;elsecur_state <= next_state;
end
//组合逻辑判断状态转移条件
always @(*) beginnext_state = st_idle;case(cur_state)st_idle: begin //空闲状态if(i2c_exec) beginnext_state = st_sladdr;endelsenext_state = st_idle;endst_sladdr: beginif(st_done) beginif(bit_ctrl) //判断是16位还是8位字地址next_state = st_addr16;elsenext_state = st_addr8 ;endelsenext_state = st_sladdr;endst_addr16: begin //写16位字地址if(st_done) beginnext_state = st_addr8;endelse beginnext_state = st_addr16;endendst_addr8: begin //8位字地址if(st_done) beginif(wr_flag==1'b0) //读写判 next_state = st_data_wr;elsenext_state = st_addr_rd;endelse beginnext_state = st_addr8;endendst_data_wr: begin //写数据(8 bit)if(st_done)next_state = st_stop;elsenext_state = st_data_wr;endst_addr_rd: begin //写地址以进行读数据if(st_done) beginnext_state = st_data_rd;endelse beginnext_state = st_addr_rd;endendst_data_rd: begin //读取数据(8 bit)if(st_done)next_state = st_stop;elsenext_state = st_data_rd;endst_stop: begin //结束I2C操作if(st_done)next_state = st_idle;elsenext_state = st_stop ;enddefault: next_state= st_idle;endcase
end
//时序电路描述状态输出
always @(posedge dri_clk or negedge rst_n) begin//复位初始化if(!rst_n) beginscl <= 1'b1;sda_out <= 1'b1;sda_dir <= 1'b1; i2c_done <= 1'b0; i2c_ack <= 1'b0; cnt <= 7'd0; st_done <= 1'b0; data_r <= 8'd0; i2c_data_r<=
i2c_data_r<= 8'd0; wr_flag <= 1'b0; addr_t <= 16'd0; data_wr_t <= 8'd0; end else begin st_done <= 1'b0 ; cnt <= cnt +1'b1 ; case(cur_state) st_idle: begin //空闲状态scl <= 1'b1; sda_out <= 1'b1; sda_dir <= 1'b1; i2c_done<= 1'b0; cnt <= 7'd0; if(i2c_exec) begin wr_flag <= i2c_rh_wl ; addr_t <= i2c_addr ; st_sladdr: begin //写地址(器件地址和字地址)case(cnt) 7'd1 : sda_out <= 1'b0; //开始I2C7'd3 : scl <= 1'b0; 7'd4 : sda_out <= SLAVE_ADDR[6]; //传送器件地址7'd5 : scl <= 1'b1; 7'd7 : scl <= 1'b0; 7'd8 : sda_out <= SLAVE_ADDR[5]; 7'd9 : scl <= 1'b1;
7'd11: scl <= 1'b0; 7'd12: sda_out <= SLAVE_ADDR[4]; 7'd13: scl <= 1'b1; 7'd15: scl <= 1'b0; 7'd16: sda_out <= SLAVE_ADDR[3]; 7'd17: scl <= 1'b1; 7'd19: scl <= 1'b0; 7'd20: sda_out <= SLAVE_ADDR[2];
7'd21: scl <= 1'b1; 7'd23: scl <= 1'b0; 7'd24: sda_out <= SLAVE_ADDR[1]; 7'd25: scl <= 1'b1; 7'd27: scl <= 1'b0; 7'd28: sda_out <= SLAVE_ADDR[0]; 7'd29: scl <= 1'b1; 7'd31: scl <= 1'b0; 7'd32: sda_out <= 1'b0; //0:写7'd33: scl <= 1'b1; 7'd35: beginsda_dir <= 1'b0; scl <= 1'b0; end 7'd36: sda_out <= 1'b1; 7'd37: scl <= 1'b1; 7'd38: begin //从机应答 st_done <= 1'b1;if(sda_in == 1'b1) //高电平表示未应答i2c_ack <= 1'b1; //拉高应答标志位 end 7'd39: begin scl <= 1'b0; cnt <= 7'd0; end default : ; endcase end st_addr16: begin case(cnt) 7'd0 : begin sda_dir <= 1'b1 ; sda_out <= addr_t[15]; //传送字地址end 7'd1 : scl <= 1'b1; 7'd3 : scl <= 1'b0; 7'd4 : sda_out <= addr_t[14]; 7'd5 : scl <= 1'b1; 7'd7 : scl <= 1'b0; 7'd8 : sda_out <= addr_t[13]; 7'd9 : scl <= 1'b1; 7'd11: scl <= 1'b0; 7'd12: sda_out <= addr_t[12]; 7'd13: scl <= 1'b1; 7'd15: scl <= 1'b0; 7'd16: sda_out <= addr_t[11]; 7'd17: scl <= 1'b1; 7'd19: scl <= 1'b0; 7'd20: sda_out <= addr_t[10]; 7'd21: scl <= 1'b1; 7'd23: scl <= 1'b0; 7'd24: sda_out <= addr_t[9]; 7'd25: scl <= 1'b1; 7'd27: scl <= 1'b0; 7'd28: sda_out <= addr_t[8];
7'd29: scl <= 1'b1; 7'd31: scl <= 1'b0; 7'd32: begin sda_dir <= 1'b0; sda_out <= 1'b1; end 7'd33: scl <= 1'b1; 7'd34: begin //从机应答st_done <= 1'b1; if(sda_in == 1'b1) //高电平表示未应答i2c_ack <= 1'b1; //拉高应答标志位 end 7'd35: begin scl <= 1'b0; cnt <= 7'd0; end default : ; endcase
end st_addr8: begin case(cnt) 7'd0: begin sda_dir <= 1'b1 ; sda_out <= addr_t[7]; //字地址end 7'd1 : scl <= 1'b1; 7'd3 : scl <= 1'b0; 7'd4 : sda_out <= addr_t[6]; 7'd5 : scl <= 1'b1; 7'd7 : scl <= 1'b0; 7'd8 : sda_out <= addr_t[5]; 7'd9 : scl <= 1'b1; 7'd11: scl <= 1'b0; 7'd12: sda_out <= addr_t[4]; 7'd13: scl <= 1'b1; 7'd15: scl <= 1'b0; 7'd16: sda_out <= addr_t[3]; 7'd17: scl <= 1'b1; 7'd19: scl <= 1'b0; 7'd20: sda_out <= addr_t[2]; 7'd21: scl <= 1'b1; 7'd23: scl <= 1'b0; 7'd24: sda_out <= addr_t[1]; 7'd25: scl <= 1'b1; 7'd27: scl <= 1'b0;
7'd28: sda_out <= addr_t[0]; 7'd29: scl <= 1'b1; 7'd31: beginsda_dir <= 1'b0; scl <= 1'b0; end 7'd32: sda_out <= 1'b1; 7'd33: scl <= 1'b1;
7'd34: begin //从机应答st_done <= 1'b1; if(sda_in == 1'b1) //高电平表示未应答i2c_ack <= 1'b1; //拉高应答标志位 end 7'd35: begin scl <= 1'b0; cnt <= 7'd0; end default : ; endcase end st_data_wr: begin //写数据(8 bit)case(cnt) 7'd0: begin sda_out <= data_wr_t[7]; //I2C写8位数据sda_dir <= 1'b1; end 7'd1 : scl <= 1'b1; 7'd3 : scl <= 1'b0; 7'd4 : sda_out <= data_wr_t[6]; 7'd5 : scl <= 1'b1; 7'd7 : scl <= 1'b0; 7'd8 : sda_out <= data_wr_t[5]; 7'd9 : scl <= 1'b1; 7'd11: scl <= 1'b0; 7'd12: sda_out <= data_wr_t[4]; 7'd13: scl <= 1'b1; 7'd15: scl <= 1'b0; 7'd16: sda_out <= data_wr_t[3]; 7'd17: scl <= 1'b1; 7'd19: scl <= 1'b0; 7'd20: sda_out <= data_wr_t[2]; 7'd21: scl <= 1'b1; 7'd23: scl <= 1'b0; 7'd24: sda_out <= data_wr_t[1]; 7'd25: scl <= 1'b1; 7'd27: scl <= 1'b0; 7'd28: sda_out <= data_wr_t[0]; 7'd29: scl <= 1'b1; 7'd31: beginsda_dir <= 1'b0; scl <= 1'b0; end 7'd32: sda_out <= 1'b1; 7'd33: scl <= 1'b1; 7'd34: begin //从机应答st_done <= 1'b1; if(sda_in == 1'b1) //高电平表示未应答i2c_ack <= 1'b1; //拉高应答标志位 end 7'd35: begin scl <= 1'b0; cnt <= 7'd0; end default : ; endcase end st_addr_rd: begin //写地址以进行读数据case(cnt) 7'd0 : begin sda_dir <= 1'b1; sda_out <= 1'b1; end 7'd1 : scl <= 1'b1; 7'd2 : sda_out <= 1'b0; //重新开始7'd3 : scl <= 1'b0; 7'd4 : sda_out <= SLAVE_ADDR[6]; //传送器件地址
7'd5 : scl <= 1'b1; 7'd7 : scl <= 1'b0; 7'd8 : sda_out <= SLAVE_ADDR[5]; 7'd9 : scl <= 1'b1; 7'd11: scl <= 1'b0; 7'd12: sda_out <= SLAVE_ADDR[4]; 7'd13: scl <= 1'b1; 7'd15: scl <= 1'b0;
7'd16: sda_out <= SLAVE_ADDR[3]; 7'd17: scl <= 1'b1; 7'd19: scl <= 1'b0; 7'd20: sda_out <= SLAVE_ADDR[2]; 7'd21: scl <= 1'b1; 7'd23: scl <= 1'b0; 7'd24: sda_out <= SLAVE_ADDR[1]; 7'd25: scl <= 1'b1; 7'd27: scl <= 1'b0; 7'd28: sda_out <= SLAVE_ADDR[0]; 7'd29: scl <= 1'b1; 7'd31: scl <= 1'b0; 7'd32: sda_out <= 1'b1; //1:读7'd33: scl <= 1'b1; 7'd35: beginscl <= 1'b0; sda_dir <= 1'b0;end 7'd36: sda_out <= 1'b1; 7'd37: scl <= 1'b1;7'd38: begin //从机应答st_done <= 1'b1; if(sda_in == 1'b1) //高电平表示未应答
i2c_ack <= 1'b1; //拉高应答标志位 end 7'd39: beginscl <= 1'b0;cnt <= 7'd0;enddefault : ;endcase
endst_data_rd: begin //读取数据(8 bit)case(cnt)7'd0: sda_dir <= 1'b0;7'd1: begindata_r[7] <= sda_in;scl <= 1'b1;end7'd3: scl <= 1'b0;7'd5: begindata_r[6] <= sda_in ;scl <= 1'b1 ;end7'd7: scl <= 1'b0;7'd9: begindata_r[5] <= sda_in;scl <= 1'b1 ;end7'd11: scl <= 1'b0;7'd13: begindata_r[4] <= sda_in;scl <= 1'b1 ;end7'd15: scl <= 1'b0;
7'd17: begindata_r[3] <= sda_in;scl <= 1'b1 ;end7'd19: scl <= 1'b0;7'd21: begindata_r[2] <= sda_in;scl <= 1'b1 ;end7'd23: scl <= 1'b0;7'd25: begin
data_r[1] <= sda_in;scl <= 1'b1 ;end7'd27: scl <= 1'b0;7'd29: begindata_r[0] <= sda_in;scl <= 1'b1 ;end
7'd31: scl <= 1'b0;7'd32: beginsda_dir <= 1'b1; sda_out <= 1'b1;end7'd33: scl <= 1'b1;7'd34: st_done <= 1'b1; //非应答7'd35: begin
scl <= 1'b0;cnt <= 7'd0;i2c_data_r <= data_r;enddefault : ;endcaseendst_stop: begin //结束I2C操作case(cnt)7'd0: beginsda_dir <= 1'b1; //结束I2Csda_out <= 1'b0;end7'd1 : scl <= 1'b1;7'd3 : sda_out <= 1'b1;7'd15: st_done <= 1'b1;
7'd16: begincnt <= 7'd0;i2c_done <= 1'b1; //向上层模块传递I2C结束信号enddefault : ;endcaseendendcaseend
endendmodule
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