Moved usrp2 fpga files into usrp2 subdir.

1 files changed, 459 insertions, 0 deletions

diff --git a/usrp2/models/M24LC024B.v b/usrp2/models/M24LC024B.v
new file mode 100644
index 000000000..45e04b450
--- /dev/null
+++ b/usrp2/models/M24LC024B.v
@@ -0,0 +1,459 @@
+// 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