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Hardware Reference Manual 379
Intel
®
IXP2800 Network Processor
Performance Monitor Unit
11.1.5 Definition of CHAP Terminology
Figure 138. Basic Block Diagram of IXP2800 Network Processor with PMU
Duration Count
The counter is incremented for each clock for which the event signal is asserted as
logic high.
MMR Memory Mapped register.
OA
Observation Architecture. The predecessor to CHAP counters that facilitates the
counting of hardware events.
Occurrence Count The counter is incremented each time a rising edge of the event signal is detected.
Preconditioning
Altering a design block signal that represents an event such that it can be counted by
the CHAP unit. The most common preconditioning is likely to be a ‘one-shot’ to count
occurrences.
RO (register) Read Only. If a register is read-only, writes to this register have no effect.
R/W (register) Read/Write. A register with this attribute can be read and written.
WO (register)
Write Once. Once written, a register with this attribute becomes Read Only. This
register can only be cleared by a Reset.
WC (register)
Write Clear. A register bit with this attribute can be read and written. However, a write
of 1 clears (sets to 0) the corresponding bit and a write of 0 has no effect.
MEDIA
I/F
PCI
I/F
Intel
XScale
®
Core
DDRAM
Control
QDR
Control
MUX Control
from PMU
Push-pull Bus
SHaC
APB Bus
Config Registers
ME1
ME2
ME3
ME4
ME8
Hardware Events
CHAP
Counters
PMU