8.8 Performance CountersThe Drawing Engine features two independent 32-bit performance counterregister DRWPERFCOUNTk (k = 1, 2) to count the number of occurrences of acertain event.The events to count can be set up independently for each performance counterregister via the performance counter control registerDRWPERFTRIGGER.PERFTRIGGER2 for DRWPERFCOUNT2 respectivelyDRWPERFTRIGGER.PERFTRIGGER1 for DRWPERFCOUNT1.The performance counter trigger event can be chosen from below list:Table 8-2 Performance counter trigger eventsDRWPERFTRIGGER.PERFTRIGGERk Event0 disable performance counter1 Drawing Engine active cycles2 framebuffer read access3 framebuffer write access4 texture read access5 invisible pixels (enumerated but selected with alpha 0%)6 invisible pixels while internal FIFO is empty (lost cycles)7 display list reader active cycles8 framebuffer read hits9 framebuffer read misses10 framebuffer write hits11 framebuffer write misses12 texture read hits13 texture read misses31 every clock cycle (for use as timer)Chapter 8 Drawing Engine252 Preliminary User's Manual S19203EE1V3UM00
