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AMD Geode™ SC1200/SC1201 Processor Data Book 63
Signal Definitions
32579B
RI2# AJ8 I Ring Indicator. When low, indicates to the modem that a
telephone ring signal has been received by the modem.
They are monitored during power-off for wakeup event
detection.
Note: If selected as RI2# function but not used, tie
RI2# high.
GPIO11+IRQ15
DCD2# C28 I Data Carrier Detected. When low, indicates that the
data transfer device (e.g., modem) is ready to establish a
communications link.
Note: If selected as DCD2# function but not used, tie
DCD2# high.
GPIO9+IDE_IOW1#
+SDTEST2
DSR2# B29 I Data Set Ready. When low, indicates that the data trans-
fer device (e.g., modem) is ready to establish a communi-
cations link.
Note: If selected as DSR2# function but not used, tie
DSR2# low.
GPIO10+
IDE_IORDY1
3.4.12 Serial Ports (UARTs) Interface Signals (Continued)
Signal Name Ball No. Type Description Mux
3.4.13 Parallel Port Interface Signals
Signal Name Ball No. Type Description Mux
ACK# B18 I Acknowledge. Pulsed low by the printer to indicate that it
has received data from the Parallel Port.
TFTDE+VOPCK+
FPCICLK
AFD#/DSTRB# D22 O Automatic Feed. When low, instructs the printer to auto-
matically feed a line after printing each line. This signal is
in TRI-STATE after a 0 is loaded into the corresponding
control register bit. An external 4.7 KΩ pull-up resistor
should be attached to this ball.
Data Strobe (EPP). Active low, used in EPP mode to
denote a data cycle. When the cycle is aborted, DSTRB#
becomes inactive (high).
TFTD2+VOPD1+
INTR_O
BUSY/WAIT# B17 I Busy. Set high by the printer when it cannot accept
another character.
Wait. In EPP mode, the Parallel Port device uses this
active low signal to extend its access cycle.
TFTD3+VOPD2+
F_C/BE1#
ERR# D21 I Error. Set active low by the printer when it detects an
error.
TFTD4+VOPD3+
F_C/BE0#
INIT# B21 O Initialize. When low, initializes the printer. This signal is
in TRI-STATE after a 1 is loaded into the corresponding
control register bit. Use an external 4.7 KΩ pull-up resis-
tor.
TFTD5+VOPD4+
SMI_O