MPC8540 datasheet(1081/1302 Pages) FREESCALE

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External Signal Descriptions

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

Freescale Semiconductor

19-3

which can be counted on any of the eight counters. Counter-specific events can be counted only

on the counter where the event is defined.

The performance monitor can generate an interrupt on overflow. Several control registers specify

how a performance monitor interrupt is signalled. The PMCs can also be programmed to freeze

when an interrupt is signalled.

19.1.2 Features

The MPC8540 performance monitor offers a rich set of features that permits a complete

performance characterization of the implementation. These features include:

•

One 64-bit counter exclusively dedicated to counting cycles

•

Eight 32-bit counters that count the occurrence of selected events

•

One global control register (affects all counters) and two local control registers per counter

•

Ability to count up to 64 reference events that may be counted on any of the eight 32-bit

counters

•

Ability to count up to 512 counter-specific events

•

Triggering and chaining capability

•

Duration threshold counting

•

Burstiness feature that permits counting of burst events with a programmable time between

bursts

•

Ability to generate an interrupt on overflow

19.2 External Signal Descriptions

The performance monitor does not have any signals that are driven externally (off-chip) but it does

assert the internal interrupt (int) signal on a performance monitor interrupt condition.

19.3 Memory Map and Register Definition

Performance monitor registers reside in the run-time register block starting at offset 0xE_1000.

This section describes the registers implemented to support the performance monitor facilities.

Table 19-1 lists the performance monitor registers. These registers can be read or written only with

32-bit accesses.

19.3.1 Register Summary

The performance monitor uses nine counter registers and a group of local control registers that are

used to specify the method of counting. Two local control registers are associated with each

counter in addition to a global control register that applies to all counters.

MPC8540 Datasheet(PDF) 1081 Page - Freescale Semiconductor, Inc

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