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BE3#
BE2#
BE1#
BEO#
I/O INTERFACING
OE#
OE#
DECODE
t--_
....
Figure 8-1. 32-Bit to 8-Bit
Bus
Conversion
a·BIT
1/0
DEVICE
231732i8·1
Another technique for interfacing with 8-bit peripherals
is
shown in Figure 8-1. The
32-bit data bus
is
multiplexed onto an 8-bit bus to accommodate byte-oriented
DMA
or
block transfers to memory-mapped 8-bit
I/O devices. The addresses assigned to devices
connected to this interface can be closely spaced because only one 8-bit section of the
data bus
is
enabled at a time.
8-3