COUNTER    DESCRIPTION
=============================
0x00	   Data read   
0x01	   Data write  
0x02	   Data TLB miss  
0x03	   Data read miss  
0x04	   Data write miss  
0x05	   Write (hit) to M or E state lines  
0x06	   Data cache lines written back  
0x07	   Data cache snoops  
0x08	   Data cache snoop hits   
0x09	   Memory accesses in both pipes  
0x0a	   Bank conflicts  
0x0b	   Misaligned data memory references  
0x0c	   Code read  
0x0d	   Code TLB miss  
0x0e	   Code cache miss  
0x0f	   Any segment register load  
0x10	   INVALID  
0x11	   INVALID  
0x12	   Branches  
0x13	   BTB hits  
0x14	   Taken branch or BTB hit  
0x15	   Pipeline flushes  
0x16	   Instructions executed  
0x17	   Instructions executed in the V-pipe  
0x18	   Bus utilization (clocks)   
0x19	   Pipeline stalled by write backup  
0x1a	   Pipeline stalled by data memory read  
0x1b	   Pipeline stalled by write to E or M line  
0x1c	   Locked bus cycle  
0x1d	   I/O read or write cycle  
0x1e	   Noncacheable memory references  
0x1f	   AGI (Address Generation Interlock)  
0x20	   INVALID  
0x21	   INVALID  
0x22	   Floating-point operations  
0x23	   Breakpoint 0 match  
0x24	   Breakpoint 1 match  
0x25	   Breakpoint 2 match  
0x26	   Breakpoint 3 match  
0x27	   Hardware interupts  
0x28	   Data read or data write  
0x29	   Data read miss or data write miss  

