Intel MCS48 User Manual page 257

2716
TYPICAL 16K
EPROM SYSTEM
•
This
scheme
accomplished
by using
CE
(PD)
as
the primary decode.
OE
(CS)
is
now
controlled by previously
unused
signal.
RD now
controls data
on and
off
the bus by
way
of
OE.
•
A
selected
2716
is
available for
systems which
require
CE
access
of less
than 450 ns
for
decode network
operation.
•
The
use
of
a
PROM
as a decoder allows
for:
a) Compatibility with
upward
(and
downward) memory
expansion.
b)
Easy assignment
of
ROM
memory
modules, compatible
with
PL/M modular
software concepts.
8K, 16K, 32K,
64K 5V
EPROM/ROM
FAMILY
PRINTED
CIRCUIT
BOARD LAYOUT
GND
<BN-*>i
+5
*
•
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CfO
4
Cl
e
COMPONENT
SIDE
•
o e o
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