Intel 80386

1/0 INTERFACING
FROM OTHER
PERIPHERALS
V"
CLOCK GENERATOR
10 K!1
CLK2 RESET
RESET
CLK2
I
AOS#
AOS#
CLK2
82380
RESET
CPURST
OPTIONAL
READY#
I
WAITSTATE READYO#
LOGIC
80386
REAOY#
HOLO
HOLO
HLOA
HLOA
INT
INT
O/C#
O/C#
W/R#
W/R#
M/IO#
M/IO#
BEO-3#,
.A
'\
K
BEO-3#,
A2-A31
!
A2-A31
;
I I
10..
00-031
K
)
00-031
~ !
UU~
TO BUS TO BUS
CONTROLLER BUFFERS
NOTE: INTERFACE WITHOUT CACHE
G30107
Figure 8-13. 80386/82380 Interface
• Auto-assembly and disassembly to convert from l6-bit memory to 8-bit I/O or vice versa
• Compare, translate, and verify functions
• The option to use one Of the four high-speed channels as a lower-speed, multiplexed
channel. The 82258 gains up to 32 more channels through multiplexing
The 82258, paired with the 82288 Bus Controller, is capable of being a bus master on a
common local bus and/or system bus with the 80386 and its bus controller. The 82258
requires both a local bus interface to act as bus master and an 80386 interface to commu-
nicate directly with the 80386.
8-24