Address Field

Byte Enable Field

Control Field

	Value		Description
	  0		Invalid
	  1		Interrupt Acknowledge
	  2		Invalid
	  3		Special Bus Cycle
	  4		Invalid
	  5		Input/Output Read
	  6		Invalid
	  7		Input/Output Write
	  8		Instruction Fetch
	  9		Noncacheable Instruction Fetch
 	 10		Invalid
	 11		Invalid
	 12		Data Read
	 13		Noncacheable Data Read
	 14		Data Writeback
	 15		Data Write

In complete address traces all instruction fetches and data reads are noncacheable because the first-level instruction and data caches are disabled. In trace data that is acquired with the first-level caches enabled only those references that are truly noncacheable are marked as such.

Included below is a very simple piece of C source code that reads the binary traces and prints an ASCII representation to stdout. This may be useful as both an introductory tool and as further trace format specification.

	#include 

	char op[16][11] = {"INVALID",
		           "INT_ACK",
		           "INVALID",
		           "SPECIAL",
		           "INVALID",
		           "IO_READ",
		           "INVALID",
		           "IO_WRITE",
		           "I_FETCH",
		           "NC_I_FETCH",
		           "INVALID",
		           "INVALID",
		           "D_READ",
		           "NC_D_READ",
		           "WRITE_BACK",
		           "D_WRITE"};
		   
	main()
	{
	  unsigned long addr;
	  unsigned char be, control;

	  fread(&addr, 4, 1, stdin);
	  fread(&be, 1, 1, stdin);
	  fread(&control, 1, 1, stdin);

	  while(!feof(stdin))
	  {
	    printf("%08x %02x %s\n",  addr, be, op[control>>4]);
	    fread(&addr, 4, 1, stdin);
	    fread(&be, 1, 1, stdin);
	    fread(&control, 1, 1, stdin);
	  }
	}