Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

A-6

ARM DDI0198D

Coprocessor 
handshake execute

Input

The handshake signals from the Execute stage of the 
coprocessors pipeline follower. Indicates ABSENT 
(10), WAIT (00), GO (01), or LAST (11). If no 
external coprocessors are attached these must be tied 
to b10 (ABSENT response).

Coprocessor valid 
instruction

Output

Valid instruction indicator for CPINSTR (replaces 
CPTBIT).

Not coprocessor 
instruction request

Output

If this signal is LOW on the rising edge of CLK and 
CPCLKEN is HIGH, the instruction on CPINSTR 
must enter the coprocessor pipeline.

Not coprocessor 
memory translate

Output

When LOW the coprocessor interface is in a 
nonprivileged state. When HIGH the coprocessor 
interface is in a privileged state.