NEC µPD72257 Preliminary User's Manual page 288

Chapter 8
8.9.6.5
Access
Address
Index
Initial Value
31 30 29 28
15 14 13 12
Bit Bit name
PERFTRIGGER
31 to 16
2
PERFTRIGGER
15 to 0
1
288
DRWPERFTRIGGER - Performance counters control register
The Drawing Engine will increment the performance counters DRWPERFCOUNT1
and DRWPERFCOUNT1 on every event selected by DRWPERFTRIGGER.
This register can be written in 32-bit units.
<DrwE_Base> + D4
H
53
0000 0000 . This register is initialized by any reset.
H
27 26 25 24
PERFTRIGGER2
11 10 9 8
PERFTRIGGER1
Function
Selects the internal event that will increment DRWPERFCOUNT2 register.
0 disable performance counter
1 Drawing Engine active cycles
2 framebuffer read access
3 framebuffer write access
4 texture read access
5 invisible pixels (enumerated but selected with alpha 0%)
6 invisible pixels while internal FIFO is empty (lost cycles)
7 display list reader active cycles
8 framebuffer read hits
9 framebuffer read misses
10 framebuffer write hits
11 framebuffer write misses
12 texture read hits
13 texture read misses
31 every clock cycle (for use as timer)
Same as above, but for performance counter 1.
Preliminary User's Manual S19203EE1V3UM00
23 22 21 20
W
7 6 5 4
W
Drawing Engine
19 18 17 16
3 2 1 0