ARM920T_14 Datasheet, PDF (142/350 Pages) ATMEL Corporation – Technical Reference Manual

Coprocessor Interface
7.1.3
Enabling and disabling the external coprocessor interface buses
The ARM920T macrocell has the CPEN input, coprocessor enable.
When tied LOW, the CPID and CPDOUT buses are held stable. When tied HIGH, the
CPID and CPDOUT buses are enabled. This is meant as a power saving feature and is
intended to be used statically within an embedded system.
7-4
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