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8286/8287
Table 1.
Pin
Description
Symbol
lYpe
Name and Function
T
I Transmit: T is an input control signal used to control the dl rection
of
the transceivers. When
HIGH,
it configures the transceiver's Bo-B7
as
outputs with Ao-A7
as
inputs. T
LOW
configures Ao-A7
as
the outputs with 80-B7 serving
as
the inputs.
OE
I
Output Enable:
OE
is
an
input control signal used to enable the appropriate output driver
(as
selected by T) onto its respective bus. This signal is active
LOW.
Ao-
A
7
I/O
Local Bus Data Pllis: These pins serve to either present data to
or
accept data from the processor's
local bus depending upon the state
of
the T pin.
~-~(8286)
I/O
System Bus Data Pins: These pins serve to either present data to
or
accept data from the system
Bo-B7(8287)
bus depending upon the state
of
the T pin.
FUNCTIONAL DESCRIPTION
The
8286
and
8287
transceivers
are
8-bit
transceivers
with
high
impedance
outputs.
With
T
active
HIGH
and
OE
ac·
live
LOW,
data
allhe
Ao-A7
pins
is
driven
onlo
the
Bo-B7
pins.
Wilh
T
inaclive
LOW
and
OE
aclive
LOW,
dala
allhe
78
Bo-B7
pins
is
driven
onto
the
Ao-A7
pins.
No
output
low
glitching
will
occur
whenever
the
transceivers
are
enler-
ing
or
leaving
Ihe
high
impedance
slale.
AFN-01S06B