Specifications

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5
Wind River Trace Performance
5.1 Introduction
The number of trace instructions in Wind River Trace memory depends on the
target processor’s operational mode. When the caches are enabled, the number of
instructions executed in a given time frame is considerably greater than when the
caches are disabled. Wind River Trace stores the trace information on every trace
clock cycle. Since Wind River Trace’s memory is 512 KB long, the trace memory
stores a constant time frame of trace information before it begins to overwrite
previously stored trace information. This means that when the caches are enabled,
a greater number of instructions executed will be stored in Wind River Trace’s
memory.
AMCC 405 Processor Performance
The AMCC 405 processor’s trace clock runs at one half the speed of the core clock.
This means that for every trace clock, the trace information emitted by the AMCC
405 is for two core clock cycles. When the caches are enabled, the trace information
can show that two instructions were executed for any trace clock cycle. This means
that with both the instruction cache and data cache enabled it is possible to see as
many as 640,000 instructions stored in the trace memory.
AMCC 440 Processor Performance
The AMCC 440 processor’s trace clock runs at one-quarter the speed of the core
clock. This means that for every trace clock, the trace information emitted by the