User manual

Signal Descriptions

CHSEX[1:0]

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).

nCPINSTRVALID

Coprocessor valid

instruction

Output Valid instruction indicator for CPINSTR (replaces

CPTBIT).

nCPMREQ

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.

nCPTRANS

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.

Table A-2 Coprocessor interface signals (continued)

Name Direction Description