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+// Modified 11/14/07 to simulate the 24lc024, which responds to the address pins
+
+// *******************************************************************************************************
+// ** **
+// ** M24LC024B.v - 24LC02B 2K-BIT I2C SERIAL EEPROM (VCC = +2.5V TO +5.5V) **
+// ** **
+// *******************************************************************************************************
+// ** **
+// ** COPYRIGHT (c) 2003 YOUNG ENGINEERING **
+// ** ALL RIGHTS RESERVED **
+// ** **
+// ** THIS PROGRAM IS CONFIDENTIAL AND A TRADE SECRET OF YOUNG ENGINEERING. THE RECEIPT OR **
+// ** POSSESSION OF THIS PROGRAM DOES NOT CONVEY ANY RIGHTS TO REPRODUCE OR DISCLOSE ITS **
+// ** CONTENTS, OR TO MANUFACTURE, USE, OR SELL ANYTHING THAT IT MAY DESCRIBE, IN WHOLE OR IN **
+// ** PART, WITHOUT THE SPECIFIC WRITTEN CONSENT OF YOUNG ENGINEERING. **
+// ** **
+// *******************************************************************************************************
+// ** Revision : 1.1 **
+// ** Modified Date : 07/19/2004 **
+// ** Revision History: **
+// ** **
+// ** 02/01/2003: Initial design **
+// ** 07/19/2004: Fixed the timing checks and the open-drain modeling for SDA. **
+// ** **
+// *******************************************************************************************************
+// ** TABLE OF CONTENTS **
+// *******************************************************************************************************
+// **---------------------------------------------------------------------------------------------------**
+// ** DECLARATIONS **
+// **---------------------------------------------------------------------------------------------------**
+// **---------------------------------------------------------------------------------------------------**
+// ** INITIALIZATION **
+// **---------------------------------------------------------------------------------------------------**
+// **---------------------------------------------------------------------------------------------------**
+// ** CORE LOGIC **
+// **---------------------------------------------------------------------------------------------------**
+// ** 1.01: START Bit Detection **
+// ** 1.02: STOP Bit Detection **
+// ** 1.03: Input Shift Register **
+// ** 1.04: Input Bit Counter **
+// ** 1.05: Control Byte Register **
+// ** 1.06: Byte Address Register **
+// ** 1.07: Write Data Buffer **
+// ** 1.08: Acknowledge Generator **
+// ** 1.09: Acknowledge Detect **
+// ** 1.10: Write Cycle Timer **
+// ** 1.11: Write Cycle Processor **
+// ** 1.12: Read Data Multiplexor **
+// ** 1.13: Read Data Processor **
+// ** 1.14: SDA Data I/O Buffer **
+// ** **
+// **---------------------------------------------------------------------------------------------------**
+// ** DEBUG LOGIC **
+// **---------------------------------------------------------------------------------------------------**
+// ** 2.01: Memory Data Bytes **
+// ** 2.02: Write Data Buffer **
+// ** **
+// **---------------------------------------------------------------------------------------------------**
+// ** TIMING CHECKS **
+// **---------------------------------------------------------------------------------------------------**
+// ** **
+// *******************************************************************************************************
+
+
+`timescale 1ns/10ps
+
+module M24LC024B (A0, A1, A2, WP, SDA, SCL, RESET);
+
+ input A0; // unconnected pin
+ input A1; // unconnected pin
+ input A2; // unconnected pin
+
+ input WP; // write protect pin
+
+ inout SDA; // serial data I/O
+ input SCL; // serial data clock
+
+ input RESET; // system reset
+
+
+// *******************************************************************************************************
+// ** DECLARATIONS **
+// *******************************************************************************************************
+
+ reg SDA_DO; // serial data - output
+ reg SDA_OE; // serial data - output enable
+
+ wire SDA_DriveEnable; // serial data output enable
+ reg SDA_DriveEnableDlyd; // serial data output enable - delayed
+
+ reg [03:00] BitCounter; // serial bit counter
+
+ reg START_Rcvd; // START bit received flag
+ reg STOP_Rcvd; // STOP bit received flag
+ reg CTRL_Rcvd; // control byte received flag
+ reg ADDR_Rcvd; // byte address received flag
+ reg MACK_Rcvd; // master acknowledge received flag
+
+ reg WrCycle; // memory write cycle
+ reg RdCycle; // memory read cycle
+
+ reg [07:00] ShiftRegister; // input data shift register
+
+ reg [07:00] ControlByte; // control byte register
+ wire RdWrBit; // read/write control bit
+
+ reg [07:00] StartAddress; // memory access starting address
+ reg [02:00] PageAddress; // memory page address
+
+ reg [07:00] WrDataByte [0:7]; // memory write data buffer
+ wire [07:00] RdDataByte; // memory read data
+
+ reg [15:00] WrCounter; // write buffer counter
+
+ reg [02:00] WrPointer; // write buffer pointer
+ reg [07:00] RdPointer; // read address pointer
+
+ reg WriteActive; // memory write cycle active
+
+ reg [07:00] MemoryBlock [0:255]; // EEPROM data memory array
+
+ integer LoopIndex; // iterative loop index
+
+ integer tAA; // timing parameter
+ integer tWC; // timing parameter
+
+
+// *******************************************************************************************************
+// ** INITIALIZATION **
+// *******************************************************************************************************
+
+ initial tAA = 900; // SCL to SDA output delay
+ initial tWC = 5000000; // memory write cycle time
+ //initial tWC = 50000; // shortened memory write cycle time to speed up sims
+
+ initial begin
+ SDA_DO = 0;
+ SDA_OE = 0;
+ end
+
+ initial begin
+ START_Rcvd = 0;
+ STOP_Rcvd = 0;
+ CTRL_Rcvd = 0;
+ ADDR_Rcvd = 0;
+ MACK_Rcvd = 0;
+ end
+
+ initial begin
+ BitCounter = 0;
+ ControlByte = 0;
+ end
+
+ initial begin
+ WrCycle = 0;
+ RdCycle = 0;
+
+ WriteActive = 0;
+ end
+
+
+// *******************************************************************************************************
+// ** CORE LOGIC **
+// *******************************************************************************************************
+// -------------------------------------------------------------------------------------------------------
+// 1.01: START Bit Detection
+// -------------------------------------------------------------------------------------------------------
+
+ always @(negedge SDA) begin
+ if (SCL == 1) begin
+ START_Rcvd <= 1;
+ STOP_Rcvd <= 0;
+ CTRL_Rcvd <= 0;
+ ADDR_Rcvd <= 0;
+ MACK_Rcvd <= 0;
+
+ WrCycle <= #1 0;
+ RdCycle <= #1 0;
+
+ BitCounter <= 0;
+ end
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.02: STOP Bit Detection
+// -------------------------------------------------------------------------------------------------------
+
+ always @(posedge SDA) begin
+ if (SCL == 1) begin
+ START_Rcvd <= 0;
+ STOP_Rcvd <= 1;
+ CTRL_Rcvd <= 0;
+ ADDR_Rcvd <= 0;
+ MACK_Rcvd <= 0;
+
+ WrCycle <= #1 0;
+ RdCycle <= #1 0;
+
+ BitCounter <= 10;
+ end
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.03: Input Shift Register
+// -------------------------------------------------------------------------------------------------------
+
+ always @(posedge SCL) begin
+ ShiftRegister[00] <= SDA;
+ ShiftRegister[01] <= ShiftRegister[00];
+ ShiftRegister[02] <= ShiftRegister[01];
+ ShiftRegister[03] <= ShiftRegister[02];
+ ShiftRegister[04] <= ShiftRegister[03];
+ ShiftRegister[05] <= ShiftRegister[04];
+ ShiftRegister[06] <= ShiftRegister[05];
+ ShiftRegister[07] <= ShiftRegister[06];
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.04: Input Bit Counter
+// -------------------------------------------------------------------------------------------------------
+
+ always @(posedge SCL) begin
+ if (BitCounter < 10) BitCounter <= BitCounter + 1;
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.05: Control Byte Register
+// -------------------------------------------------------------------------------------------------------
+
+ always @(negedge SCL) begin
+ if (START_Rcvd & (BitCounter == 8)) begin
+ if (!WriteActive & (ShiftRegister[07:04] == 4'b1010)
+ & (ShiftRegister[3:1] == {A2,A1,A0})) begin
+ if (ShiftRegister[00] == 0) WrCycle <= 1;
+ if (ShiftRegister[00] == 1) RdCycle <= 1;
+
+ ControlByte <= ShiftRegister[07:00];
+
+ CTRL_Rcvd <= 1;
+ end
+
+ START_Rcvd <= 0;
+ end
+ end
+
+ assign RdWrBit = ControlByte[00];
+
+// -------------------------------------------------------------------------------------------------------
+// 1.06: Byte Address Register
+// -------------------------------------------------------------------------------------------------------
+
+ always @(negedge SCL) begin
+ if (CTRL_Rcvd & (BitCounter == 8)) begin
+ if (RdWrBit == 0) begin
+ StartAddress <= ShiftRegister[07:00];
+ RdPointer <= ShiftRegister[07:00];
+
+ ADDR_Rcvd <= 1;
+ end
+
+ WrCounter <= 0;
+ WrPointer <= 0;
+
+ CTRL_Rcvd <= 0;
+ end
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.07: Write Data Buffer
+// -------------------------------------------------------------------------------------------------------
+
+ always @(negedge SCL) begin
+ if (ADDR_Rcvd & (BitCounter == 8)) begin
+ if ((WP == 0) & (RdWrBit == 0)) begin
+ WrDataByte[WrPointer] <= ShiftRegister[07:00];
+
+ WrCounter <= WrCounter + 1;
+ WrPointer <= WrPointer + 1;
+ end
+ end
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.08: Acknowledge Generator
+// -------------------------------------------------------------------------------------------------------
+
+ always @(negedge SCL) begin
+ if (!WriteActive) begin
+ if (BitCounter == 8) begin
+ if (WrCycle | (START_Rcvd & (ShiftRegister[07:04] == 4'b1010))) begin
+ SDA_DO <= 0;
+ SDA_OE <= 1;
+ end
+ end
+ if (BitCounter == 9) begin
+ BitCounter <= 0;
+
+ if (!RdCycle) begin
+ SDA_DO <= 0;
+ SDA_OE <= 0;
+ end
+ end
+ end
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.09: Acknowledge Detect
+// -------------------------------------------------------------------------------------------------------
+
+ always @(posedge SCL) begin
+ if (RdCycle & (BitCounter == 8)) begin
+ if ((SDA == 0) & (SDA_OE == 0)) MACK_Rcvd <= 1;
+ end
+ end
+
+ always @(negedge SCL) MACK_Rcvd <= 0;
+
+// -------------------------------------------------------------------------------------------------------
+// 1.10: Write Cycle Timer
+// -------------------------------------------------------------------------------------------------------
+
+ always @(posedge STOP_Rcvd) begin
+ if (WrCycle & (WP == 0) & (WrCounter > 0)) begin
+ WriteActive = 1;
+ #(tWC);
+ WriteActive = 0;
+ end
+ end
+
+ always @(posedge STOP_Rcvd) begin
+ #(1.0);
+ STOP_Rcvd = 0;
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.11: Write Cycle Processor
+// -------------------------------------------------------------------------------------------------------
+
+ always @(posedge WriteActive) begin
+ for (LoopIndex = 0; LoopIndex < WrCounter; LoopIndex = LoopIndex + 1) begin
+ PageAddress = StartAddress[02:00] + LoopIndex;
+
+ MemoryBlock[{StartAddress[07:03],PageAddress[02:00]}] = WrDataByte[LoopIndex[02:00]];
+ end
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.12: Read Data Multiplexor
+// -------------------------------------------------------------------------------------------------------
+
+ always @(negedge SCL) begin
+ if (BitCounter == 8) begin
+ if (WrCycle & ADDR_Rcvd) begin
+ RdPointer <= StartAddress + WrPointer + 1;
+ end
+ if (RdCycle) begin
+ RdPointer <= RdPointer + 1;
+ end
+ end
+ end
+
+ assign RdDataByte = MemoryBlock[RdPointer[07:00]];
+
+// -------------------------------------------------------------------------------------------------------
+// 1.13: Read Data Processor
+// -------------------------------------------------------------------------------------------------------
+
+ always @(negedge SCL) begin
+ if (RdCycle) begin
+ if (BitCounter == 8) begin
+ SDA_DO <= 0;
+ SDA_OE <= 0;
+ end
+ else if (BitCounter == 9) begin
+ SDA_DO <= RdDataByte[07];
+
+ if (MACK_Rcvd) SDA_OE <= 1;
+ end
+ else begin
+ SDA_DO <= RdDataByte[7-BitCounter];
+ end
+ end
+ end
+
+// -------------------------------------------------------------------------------------------------------
+// 1.14: SDA Data I/O Buffer
+// -------------------------------------------------------------------------------------------------------
+
+ bufif1 (SDA, 1'b0, SDA_DriveEnableDlyd);
+
+ assign SDA_DriveEnable = !SDA_DO & SDA_OE;
+ always @(SDA_DriveEnable) SDA_DriveEnableDlyd <= #(tAA) SDA_DriveEnable;
+
+
+// *******************************************************************************************************
+// ** DEBUG LOGIC **
+// *******************************************************************************************************
+// -------------------------------------------------------------------------------------------------------
+// 2.01: Memory Data Bytes
+// -------------------------------------------------------------------------------------------------------
+
+ wire [07:00] MemoryByte00 = MemoryBlock[00];
+ wire [07:00] MemoryByte01 = MemoryBlock[01];
+ wire [07:00] MemoryByte02 = MemoryBlock[02];
+ wire [07:00] MemoryByte03 = MemoryBlock[03];
+ wire [07:00] MemoryByte04 = MemoryBlock[04];
+ wire [07:00] MemoryByte05 = MemoryBlock[05];
+ wire [07:00] MemoryByte06 = MemoryBlock[06];
+ wire [07:00] MemoryByte07 = MemoryBlock[07];
+
+ wire [07:00] MemoryByte08 = MemoryBlock[08];
+ wire [07:00] MemoryByte09 = MemoryBlock[09];
+ wire [07:00] MemoryByte0A = MemoryBlock[10];
+ wire [07:00] MemoryByte0B = MemoryBlock[11];
+ wire [07:00] MemoryByte0C = MemoryBlock[12];
+ wire [07:00] MemoryByte0D = MemoryBlock[13];
+ wire [07:00] MemoryByte0E = MemoryBlock[14];
+ wire [07:00] MemoryByte0F = MemoryBlock[15];
+
+// -------------------------------------------------------------------------------------------------------
+// 2.02: Write Data Buffer
+// -------------------------------------------------------------------------------------------------------
+
+ wire [07:00] WriteData_0 = WrDataByte[00];
+ wire [07:00] WriteData_1 = WrDataByte[01];
+ wire [07:00] WriteData_2 = WrDataByte[02];
+ wire [07:00] WriteData_3 = WrDataByte[03];
+ wire [07:00] WriteData_4 = WrDataByte[04];
+ wire [07:00] WriteData_5 = WrDataByte[05];
+ wire [07:00] WriteData_6 = WrDataByte[06];
+ wire [07:00] WriteData_7 = WrDataByte[07];
+
+
+// *******************************************************************************************************
+// ** TIMING CHECKS **
+// *******************************************************************************************************
+
+ wire TimingCheckEnable = (RESET == 0) & (SDA_OE == 0);
+
+ specify
+ specparam
+ tHI = 600, // SCL pulse width - high
+ tLO = 1300, // SCL pulse width - low
+ tSU_STA = 600, // SCL to SDA setup time
+ tHD_STA = 600, // SCL to SDA hold time
+ tSU_DAT = 100, // SDA to SCL setup time
+ tSU_STO = 600; // SCL to SDA setup time
+
+ $width (posedge SCL, tHI);
+ $width (negedge SCL, tLO);
+
+ $setup (SCL, negedge SDA &&& TimingCheckEnable, tSU_STA);
+ $setup (SDA, posedge SCL &&& TimingCheckEnable, tSU_DAT);
+ $setup (SCL, posedge SDA &&& TimingCheckEnable, tSU_STO);
+
+ $hold (negedge SDA &&& TimingCheckEnable, SCL, tHD_STA);
+ endspecify
+
+endmodule
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