// **********************************************************************
// SysSpecs.h
//
// A set of defines that are used throughout many of the later projects.
// These defined values dictate many of the specifications of the system.
// The specs that are defined in this file include:
//
//		Word Size of the Computer.
//		Little Endian or Bit Endian word storage
//		Number of Registers
//		Size of Main Memory
//		Memory Latency
//
// **********************************************************************
// CS251 -	Computer Organization
//			Spring 1997
//			Dickinson College
//			Grant Braught
//
// **********************************************************************

#ifndef SYSSPECS

#define SYSSPECS

// *****************
// Word Size
// *****************
//
// Define the number of bytes that are in a word.  Any relevant sections of
// code should check this location before creating their data structures.  So
// if the word size is changed here it should change the word size for the
// whole computer.  This should be valid up to 4 bytes or 32 bits - more than
// that and the value of the word can no longer be held by an integer type.

#define WORD_SIZE 2

// *****************
// Memory Size
// *****************
//
// The memory size of the computer.  It is intentionally less than the
// full address space of the comtpuer.  This is so that a virtual memory
// system can be experimented with.

#define MEMORY_SIZE 4096

// *****************
// Memory Latency
// *****************
//
// Define the number of calls to the memory Evaluate function that are
// required before the memory will return a value.  This is sort of a
// kludge to make memory access take longer than one machine cycle.
// It's initial value of 5 will cause a memory access to take 5
// machine cycles.

#define MEMORY_LATENCY 5

// *****************
// Registers
// *****************
//
// Define the number of registers that this machine will have.  
// Each register will be WORD_SIZE bytes wide.  The number of registers
// should always be a power of 2 for maximum efficiency.  If more than 16
// registers are being used the Combinational logic circuits will need
// to be modified & possibly the InfoTypes stuff too.

#define NUM_REGISTERS 16


// *****************
// Word Format
// *****************
//
// Define whether the bytes in a word are stored in Little Endian or 
// Big Endian format.  All relevant sections of code should look at this
// define to determine how to handle words retrieved from memory.  So if
// we wanted to change the machine from LE to BE we would only have to 
// change it here.

#define LITTLE_ENDIAN	0
#define BIG_ENDIAN		1

//#define ENDIAN LITTLE_ENDIAN		// Comment out the one of these two lines
#define ENDIAN BIG_ENDIAN			// that does not apply.


#endif