Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK データシート

ARM DDI0198D

8-3

This is one technique for generating a clock that reflects the ARM9EJ-S core pipeline 
advancing. If CPCLKEN is LOW on the rising edge of CPCLK then the ARM9EJ-S 
core pipeline is stalled and the coprocessor pipeline should not advance. 

There are three classes of coprocessor instructions:

Load coprocessor register from memory or store coprocessor 
register to memory.

Register transfer between the coprocessor and the ARM processor 
core.

Coprocessor data operation.

Examples of how a coprocessor must execute these instruction classes are given in:

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