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HP 5384A Service Manual

HP 5384A
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•
•
•
of
address
dependency
is
to
allow
a
symbolic
presen-
tation
of
the
entire
array.
An
input
of
the
array
shown
at a
particular
element
of
this general section
is
common
to
the
corresponding
elements
of
all
selected
sections
of
the
array.
An
output
of
the
array
shown
at a
particular
element
of
this general section
is
the
result
of
the
OR
function
of
the
outputs
of
the
corresponding
elements
of
selected sections.
If
the
label
of
an
output
of
the
array
shown
at
a
particular
element
of
this general section indicates
that
this
output
is
an
open-circuit
output
or
a three-state
output,
then
this
indication
refers
to
the
output
of
the
amiy
and
not
to
those
of
the
sections
of
the
array.
8-119.
Inputs
that
are
not
affected
by
any
affecting
address
input
have
their
normally
defined
effect
on
all sections
of
the
array, whereas
inputs
affected
by
an
address
input
have
their
normally
defined
effect
only
on
the
section selected by
that
address
input.
8-120. An
affecting
address
input
is
labeled
with
the
letter
A
followed
by
an
identifying
number
that
corresponds
with
the
address
of
the
particular
section
of
the
array selected
by
this
input.
Within
the
general
section
presented
by
the
symbol,
inputs
and
outputs
affected
by an
Am
input
are
labeled
with
the
letter
A,
which
stands
for
the
identifying
numbers,
i.e.,
the
addresses,
of
the
particular
sections.
8-121.
Figure 8-22 shows a
3-word
by
2-bit
memory
having
a separate address
line
for
each
word
and uses
EN
dependency
to
explain
the
operation.
To
select
word
1,
input
a
is
taken
to
its 1 state,
which
establishes
mode
1. Data can
now
be
clocked
into
the
inputs
marked
"1,
40".
Unless
words
2 and 3 are also
selected,
data
cannot
be
clocked
in
at
the
inputs
marked
"2,
40"
and
"3,
40".
The
outputs
will
be
the
OR
functions
of
the
selected
outputs,
i.e.,
only
those
enabled
by
the
active
EN
functions.
a
a
b
b
c
c
d
-
d
e
e
9
h
9
Figure 8-22. A (Address)
Dependency
HP 5384A and HP 5385A
Service
8-122. The
identifying
numbers
of
affecting
address
inputs
correspond
with
the
addresses
of
the
sections
selected by these inputs. They
need
not
necessarily
differ
from
those
of
other
affecting
dependency-
inputs
(e.g., G,
V,
N,
... ),because
in
the
general section
presented
by
the
symbol
they
are
replaced
by
the
letter
A.
8-123.
If
there
are several sets
of
affecting
Am
inputs
for
the
purpose
of
independent
and possibly
simul-
taneous access
to
sections
of
the
array,
then
the
letter
A
is
modified
to
1A, 2A, ... , because
they
have access
to
the
same sections
of
the
array, these sets
of
A
inputs
may have
the
same
identifying
numbers.
8-124. Figure 8-23
is
another
illustration
of
the
A
(Address)
dependency.
0
A15
Figure 8-23.
RAM
Example*
*Arrary
of
16sections
of
four
transparent latches
with
three-state
outputs
comprising
a
16-word
by
four-bit
random
access
memory.
8-125. Bistable Elements
8-126. The
dynamic
input
symbol,
the
postponed
output
symbol,
and
dependency
notation
provide
the
tools
to
differentiate
four
main
types
of
bistable
elements
and
make
synchronous
and
asynchronous
inputs
easily
recognizable.
See
Figure 8-24. The first
column
shows
the
essential
distinguishing
features;
the
other
columns
show
examples.
8-17

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HP 5384A Specifications

General IconGeneral
BrandHP
Model5384A
CategoryCash Counter
LanguageEnglish

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