-MEMR(O)
-Memory
Read: This command line instructs the memory to drive _
its
data
onto
the
data
bus.
It
may be driven by the
microprocessor
or
the
DMA
controller. This signal
is
active low.
-MEMW(O)
-Memory
Write: This command line instructs the memory to
store
the
data
present
on
the data bus. It may be driven by the
microprocessor
or
the
DMA
controller. This signal
is
active low.
OSC
(0)
Oscillator: High-speed clock with a 70ns period (14.31818MHz).
It
has
a
50%
duty cycle.
RESET
DRV
(0)
Reset
Drive:· This line is used
to
reset
or
initialize system logic
upon
power-up
or
during a low line-voltage outage. This signal is
synchronized
to
the falling edge
of
CLK
and
is active high.
TIC
(0)
Terminal Count: This line provides a pulse when the terminal
count
for any
DMA
channel
is
reached. This signal
is
active high.
System Board 1-23
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