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CACHE SUBSYSTEMS
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1
SYSTEM
BUS
i3B6'"
ox
CPU
LOCAL BUS
~
82385
LOCAL
BUS
~
231732i7-11
Figure 7-11. Intel386™
OX
Microprocessor/82385 System Bus Structure
bus. The 82385 local bus
is
not simply a buffered version of the Intel386 DX micropro-
cessor local bus, but rather
is
distinct from and able to operate in parallel with the
Intel386
DX
microprocessor local bus. The
82385
directly interfaces to the Intel386
DX
microprocessor on the Intel386
DX
microprocessor local bus.
7.7.2 82385/lnte1386
OX
Microprocessor Interface
The
82385
directly interfaces to the Intel386
DX
microprocessor.
It
has three inputs
which are used to decode Inte1386
DX
microprocessor local bus accesses, non-cacheable
memory accesses, and 16-bit accesses.
It
runs fully synchronously with the Intel386
DX
microprocessor and returns data with a full 32-bit data bus. The Intel387
DX
math
coprocessor also resides on the Intel386
DX
microprocessor local bus.
7.7.2.1 Intel386
OX
MICROPROCESSOR INTERFACE
The connections between the Intel386
DX
microprocessor and the
82385
are shown in
Figure 7-12. As can be seen, the 82385 interfaces directly to the Intel386
DX
micropro-
cessor. The
82385
setup specifications for the Intel386
DX
microprocessor address and
control bus are designed to meet the Intel386
DX
microprocessor output delays.
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