Sharp FO IS125N - B/W Laser - All-in-One Service Manual page 99

9) CX95110 (IC1000) Terminal description
Pin Name Pin No.
XTALI/CLKIN 31
XTALO 32
RESETn 10
IRQ 8
CSn 1
SDI 2
SDO 3
SCK 4
GPIO0 11
GPIO1 12
GPIO2 13
GPIO3 18
GPIO4 19
RIn 9
SDAA_PWM 22
SDAA_RCREF 30
Pin I/O
Crystal/Clock Signals
I OSC
O OSC
Host Control Signals
I GPH
O GP
I GPH
Serial Peripheral Interface (SPI)
O GPH
I GPH
I GPH
GPIO Signals
I/O GPH
I/O GPH
I/O GPH
I/O GPH
I/O GPH
Ring Indicator Signal
O GP
Speaker Interface Signals
O GP
SmartDAA Interface Signals
I -
I/O Type
Crystal/Oscillator In. The modem must be connected to
an external crystal/oscillator circuit consisting of a 28.224
MHz crystal/oscillator.
Label
XTALI/CLKIN
Crystal Out. The modem must be connected to an external
crystal circuit consisting of a 28.224 MHz crystal. Do not
connect when using an oscillator.
Label
XTALO/NC
Reset. RESETn low holds the modem in the reset state.
RESETn going high releases the modem from the reset
state and initiates normal operation using power turn-on
(default) values. If RESETn is asserted during normal oper-
ation, RESETn must be held low for at least 3 µs. During
power-on, RESETn must be held low for at least 10 ms
after VDDO (+3.3 V) is within operating limits. The modem
is ready to be accessed by the host 320 ms after bit 2 of
register $2E is set to a 1.
Interrupt Request. Interrupt generated by modem DSP
sources. The polarity is programmable. When it is active
low, the signal can be connected with other active low,
open-drain IRQ sources to form a single interrupt request in
a wire-OR configuration. In that configuration, an external
pull-up resistor to +3.3V is required on the line, and should
be located near the receiver of IRQ.
Chip Select. The active low CSn input selects and enables
the HSD for serial data transfer between the HSD and the
host over the SPI interface.
Serial Data Input. Output data from modem to host con-
troller (SPI master).
Serial Data Output. Input data to modem from host con-
troller (SPI master).
Serial Data Clock. SPI input clock.
General Purpose I/O 0. Hysteresis input with a bus holder.
General Purpose I/O 1. Hysteresis input with a bus holder.
General Purpose I/O 2. Hysteresis input with a bus holder.
General Purpose I/O 3. Hysteresis input with a bus holder.
General Purpose I/O 4. Hysteresis input with a bus holder.
Ring Indicator. The RIn output follows the ringing signal
coming out of the DSP's ring qualification block with a low
level (0 V) during the ON time, and a high level (+3.3 V)
during the OFF time.
Speaker Output. Analog or digital speaker output signal for
line monitoring function. An external speaker driver is
needed. If no used, tie to ground through a 75 kΩ resistor.
SSD RC Oscillator Reference. Connect to VDDO through
a 240 kΩ resistor.
5 – 8
FO-IS125N
Signal Description
Crystal Oscillator
XTALI CLKIN
Crystal Oscillator
XTALO NC