Xerox WorkCentre 385, Руководство по обслуживанию, Страница: 166 / 184

WorkCentre 385
Circuit Description
12/98
7 - 32
RLSD 79 O Received line signal detector
RLSD becomes active at the end of the reception of the training
sequence indicating the beginning of data reception. If no training is
detected but the received energy level is above the RLSD off-to-on
threshold, RLSD will become active.
XTALI
XTALO 68
69 I
O
Oscillator In/Out
An external 24.00014MHz (KS16116) or 38.00053 MHz (KS16117)
crystal and two capacitors are connected to the XTALI and XTALO.
Alternatively, an external crystal oscillator of the appropriate frequency
can be connected to the XTALI input leaving XTALO unconnected.
In order to minimize electromagnetic emissions and ensure proper
oscillator start up and operation, the crystal and the capacitors should
be placed as close as possible to the XTALI and XTALO pins. Further,
the circuit board traces connecting the crystal and capacitors to XTALI
and XTALO should be as short as possible. The use of circuit board
bias should be avoided in the crystal oscillator circuitry and circuit board
traces should be routed using curved turns.
PORI 67 I Power On reset In
When power is first applied to the modem, PORI is held low for
approximately 350ms. The modem is turn ready for normal operation
15ms after the low to high transition of PORI.
V
DD
22, 72 Power +5V Digital voltage supply
This pin must be connected to +5V +/- 5% supply. The +5V Digital
power supply voltage ripple should not exceed 100mV
p-p
.
V
CC
46 Power +5V Analog voltage supply
This pin must be connected to +5V +/- 5% supply. The +5V Analog
power supply voltage ripple should not exceed 100mV
p-p
.
GNDD 6, 7, 16,
23, 50,
66,
77, 80,
81,
89, 92,
97
GND Digital ground
These pins must be connected to digital ground.
Table 3: Hardware Interface Signal Descriptions
Signal PIN No. Type Description
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