I2c for eeprom 24c16 and xc9572

[Lokesh Waran]

Can any one say is it possible to implement this code in ATMEL 24C16 EEPROM device for write the data.while i am implementing this with CPLD xc9572 I/O Pin declared as sda,scl there wont have write operation its operting frequency is 132kHz .voltage compatibility in CPLD is 3.3volt and EEPROM Datasheet describes it will operate from 2.7 volt to 5volt.THANKS FOR ALL OF YOU TO READ THIS.

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Code Verilog - [expand]
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`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: // // Create Date: 12:13:36 01/29/2014 // Design Name: // Module Name: i2c_prorocol // Project Name: // Target Devices: // Tool versions: // Description: // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // //////////////////////////////////////////////////////////////////////////////////
 
module i2c_protocol(clk,write,sda,scl_clock,scl);
 
input clk; input write; output scl; output scl_clock; inout sda; //---------------------------------------------------------
 
reg [6:0] dev_addr_write = 7'b1010000; reg [7:0] word_address_write = 8'b00000001; reg [7:0] data = 8'b01110101;
 
//---------------------------------------------------------
 
wire scl; wire sda; //wire wr_rd_in; //--------------------------------------------------------- reg wr_rd=0; reg temp_reg=0; reg scl_out=1'b0; reg scl_out_ss=1'b0; reg sda1=1'b0;
 
reg [8:0] state=0; reg [10:0] count=0;
 
reg scl_clock=1'b0; reg slave_ack=1'bz;
 
//-------------------------------------------------------- //assign wr_rd_in =(wr_rd==1)?1'b0:1'bz;
 
//--------------------------------------------------------------------------------- always @ (posedge clk)
begin
 
count <= count+1;
if (count <=49)
  scl_clock<=0;
 
if (count>=50)
  scl_clock<=1;
 
if (count>=100)
 count<=0;    
end
 
always@(posedge scl_clock ) begin
if(write==0) temp_reg<=1;
 
  if(temp_reg==1)
  if(write==1)
  begin
         temp_reg<=0;
         wr_rd<=1;      
  end   
 
          if(wr_rd==1)
                    state<=state+1;                 
 
     case(state)
 
        7'd0:begin scl_out_ss<=1;sda1<=1;end    
        7'd1: sda1<=0;  
        7'd2: scl_out_ss<=0;
 
        7'd3: sda1<=dev_addr_write[6];
        7'd4: sda1<=dev_addr_write[5];          
        7'd5: sda1<=dev_addr_write[4];
        7'd6: sda1<=dev_addr_write[3];      
        7'd7: sda1<=dev_addr_write[2];  
        7'd8: sda1<=dev_addr_write[1];
        7'd9: sda1<=dev_addr_write[0];
        7'd10: sda1<=0;
        7'd11: sda1<=slave_ack; 
 
 
        7'd12: sda1<=word_address_write[7];
        7'd13: sda1<=word_address_write[6];
        7'd14: sda1<=word_address_write[5];         
        7'd15: sda1<=word_address_write[4];
        7'd16: sda1<=word_address_write[3];
        7'd17: sda1<=word_address_write[2];
        7'd18: sda1<=word_address_write[1];
        7'd19: sda1<=word_address_write[0];
        7'd20: sda1<=slave_ack; 
 
 
        7'd21: sda1<=data[7];
        7'd22: sda1<=data[6];
        7'd23: sda1<=data[5];           
        7'd24: sda1<=data[4];
        7'd25: sda1<=data[3];
        7'd26: sda1<=data[2]; 
        7'd27: sda1<=data[1]; 
        7'd28: sda1<=data[0];
        7'd29: sda1<=slave_ack; 
 
        7'd30:begin sda1<=0;scl_out_ss<=1;end
        7'd31:sda1<=1;
        7'd32:begin state<=0;wr_rd<=0;end
        endcase
end assign scl=(state>=4 & (state<=29))? scl_clock:scl_out_ss; assign sda=sda1;
 
endmodule

---

 

[aruipksni]

Can any one say is it possible to implement this code in ATMEL 24C16 EEPROM device for write the data.while i am implementing this with CPLD xc9572 I/O Pin declared as sda,scl there wont have write operation its operting frequency is 132kHz .voltage compatibility in CPLD is 3.3volt and EEPROM Datasheet describes it will operate from 2.7 volt to 5volt.THANKS FOR ALL OF YOU TO READ THIS.

---

Code Verilog - [expand]
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`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////// // Company: // Engineer: // // Create Date: 12:13:36 01/29/2014 // Design Name: // Module Name: i2c_prorocol // Project Name: // Target Devices: // Tool versions: // Description: // // Dependencies: // // Revision: // Revision 0.01 - File Created // Additional Comments: // //////////////////////////////////////////////////////////////////////////////////
 
module i2c_protocol(clk,write,sda,scl_clock,scl);
 
input clk; input write; output scl; output scl_clock; inout sda; //---------------------------------------------------------
 
reg [6:0] dev_addr_write = 7'b1010000; reg [7:0] word_address_write = 8'b00000001; reg [7:0] data = 8'b01110101;
 
//---------------------------------------------------------
 
wire scl; wire sda; //wire wr_rd_in; //--------------------------------------------------------- reg wr_rd=0; reg temp_reg=0; reg scl_out=1'b0; reg scl_out_ss=1'b0; reg sda1=1'b0;
 
reg [8:0] state=0; reg [10:0] count=0;
 
reg scl_clock=1'b0; reg slave_ack=1'bz;
 
//-------------------------------------------------------- //assign wr_rd_in =(wr_rd==1)?1'b0:1'bz;
 
//--------------------------------------------------------------------------------- always @ (posedge clk)
begin
 
count <= count+1;
if (count <=49)
  scl_clock<=0;
 
if (count>=50)
  scl_clock<=1;
 
if (count>=100)
 count<=0;    
end
 
always@(posedge scl_clock ) begin
if(write==0) temp_reg<=1;
 
  if(temp_reg==1)
  if(write==1)
  begin
         temp_reg<=0;
         wr_rd<=1;      
  end   
 
          if(wr_rd==1)
                    state<=state+1;                 
 
     case(state)
 
        7'd0:begin scl_out_ss<=1;sda1<=1;end    
        7'd1: sda1<=0;  
        7'd2: scl_out_ss<=0;
 
        7'd3: sda1<=dev_addr_write[6];
        7'd4: sda1<=dev_addr_write[5];          
        7'd5: sda1<=dev_addr_write[4];
        7'd6: sda1<=dev_addr_write[3];      
        7'd7: sda1<=dev_addr_write[2];  
        7'd8: sda1<=dev_addr_write[1];
        7'd9: sda1<=dev_addr_write[0];
        7'd10: sda1<=0;
        7'd11: sda1<=slave_ack; 
 
 
        7'd12: sda1<=word_address_write[7];
        7'd13: sda1<=word_address_write[6];
        7'd14: sda1<=word_address_write[5];         
        7'd15: sda1<=word_address_write[4];
        7'd16: sda1<=word_address_write[3];
        7'd17: sda1<=word_address_write[2];
        7'd18: sda1<=word_address_write[1];
        7'd19: sda1<=word_address_write[0];
        7'd20: sda1<=slave_ack; 
 
 
        7'd21: sda1<=data[7];
        7'd22: sda1<=data[6];
        7'd23: sda1<=data[5];           
        7'd24: sda1<=data[4];
        7'd25: sda1<=data[3];
        7'd26: sda1<=data[2]; 
        7'd27: sda1<=data[1]; 
        7'd28: sda1<=data[0];
        7'd29: sda1<=slave_ack; 
 
        7'd30:begin sda1<=0;scl_out_ss<=1;end
        7'd31:sda1<=1;
        7'd32:begin state<=0;wr_rd<=0;end
        endcase
end assign scl=(state>=4 & (state<=29))? scl_clock:scl_out_ss; assign sda=sda1;
 
endmodule

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View attachment 101812

setup/hold time to data should be considered.
scl, sda should be in open drain : 0 or high z levels.
you need to have BUFT for it.