Fluke 9132A Service Manual page 17

©
9132A Service
[SINC
REFERENCE Em)
F<
ADDRESS
COMPARATOR
BER
rooness
Figure 2-2.
for example, ROMIPIN28POL, which chooses if the
the
comparator
are,
existing pin is or low
high
ROMIPIN28DC-
is low, the
ROMIPIN28. This
type
The output of
the
comparator
Two other pins are input to
reports that
output enable
1, the
ROMIDC-
don't care
is a
into U29 are active, the output of the comparator, COMPAREQ- (U29 pin
active
8), low.
goes
The output of the comparator
is more detail further
explained in
clock
AC74 Flip-Flop. Once the latch
U21B,
to
an
the OR gate (U37C)
until
The comparator
pin 13.
the ROM Modules.
BCYCLECLK-
active, the clock latch output goes
is
MEMORY EMULATION POD
COUBRRE.
VALID-COMPARE
femme]
EQUAL
a
©
meri
I
AE
As
CYCLE CLOCK
COUNTER
A
ADDRESS OR
VALID
DATASYNC-CLK
Generation
Sync
the compare,
for
comparator does not care about the state of
of architecture
used throughout
is
summed
is
by
U29. ROMISEL-,
chip enable on the module are active.
and
for
ROM1SEL-
the
signal
is BCYCLECLK- (BCYCLECLK-
sampled
by
on in this section).
forced to clear
by a
COMPAREQ- recognizes events occurring
signal
When COMPAREQ- is received
COUNT-ENABLE
bel
uLsE,
pa
[sYNCPULSE
SOUT
:
>
ol
ROMIPIN28DC-.
and
the
comparator.
U29, 8-input NAND gate.
an
output from ROM Module
an
When the pins
line. all
BCYCLECLK-
is set, it
stays set using
reset or rearm signal
U21
at
true.
When
is a
at U21
at
and