Specifications

AHB Monitor

Counted events on EXPansion layer

The expansion layer is connected to an AHB-AHB bridge to enable external AHB

components to be interfaced to the ARM926EJ-S Development Chip. The AHB-AHB

bridge passes all AHB signals between AHB domains, with exception of SPLIT and

RETRY responses, which are substituted with stall-cycles with the response signals.

Table 4-10 shows all the events that are recorded on the EXPansion layer. These

counters are enabled through the counter enable bit in the AHBMONCtrlReg. All

counters can be reset by writing to the AHBMONRstCntrs register, and preset to their

absolute address by writing to the AHBMONPrstCntrs register

CtDma1WaitNonSeqSlave Number of wait states on the first transfer of a burst that

were caused by a slave

CtDma1WaitNonSeqBus Number of wait states on the first transfer of a burst that

were caused by the bus infrastructure

CtDma1WaitThresholdHit Number of occurrences that a wait-state exceeded a

configurable threshold

Table 4-10 EXP layer events

Counter Name Description

CtExpRd Total number of read transfers

CtExpWr Total number of write transfers

CtExpRdApbDma Total number of read transfers to the DMA peripherals

APB Bridge

CtExpWrApbDma Total number of write transfers to the DMA

peripherals APB Bridge

CtExpRdApbCore Total number of read transfers to the Core peripherals

APB Bridge

CtExpWrApbCore Total number of write transfers to the Core peripherals

APB Bridge

CtExpBurstSingle Number of single beat bursts

CtExpBurstIncr Number of undefined length bursts

Table 4-9 DMA 1 events (continued)

Counter Name Description