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HARDWARE IMPLEMENTATION
WAIT instruction, which suspends the 80386
until BUSY goes inactive. The coprocessor
asserts
ERROR when
it
encounters an exception
that should be handled by operating system
software; the
80386 in turn invokes the numeric
CLK2 [
BEO,
BEl
[
ADDRESS
AND
[
DEFINITION
ADS [
BS16
[
READY
[
00-015
[
016-031 [
exception handler by raising exception
7.
The
PEREQ pin
is
used to implement the 80386-
coprocessor protocol.
32-BIT
BUS SIZE
00-015
~-
IGNORED
9-
Figure
5-7.
Mixed 16- and 32-bit Accesses
5-8