14 fast infrared (ir) port interface signals – AMD Geode SC1201 User Manual
Page 64
64
AMD Geode™ SC1200/SC1201 Processor Data Book
Signal Definitions
32579B
PD7
A18
I/O
Parallel Port Data. Transfer data to and from the periph-
eral data bus and the appropriate Parallel Port data regis-
ter. These signals have a high current drive capability.
TFTD13+F_AD7
PD6
A20
TFTD1+VOPD0+
F_AD6
PD5
C19
TFTD11+F_AD5
PD4
C18
TFTD10+F_AD4
PD3
C20
TFTD9+F_AD3
PD2
D20
TFTD8+VOPD7+
F_AD2
PD1
A21
TFTD7+VOPD6+
F_AD1
PD0
C21
TFTD6+VOPD5+
F_AD0
PE
D17
I
Paper End. Set high by the printer when it is out of
paper.
This ball has an internal weak pull-up or pull-down resis-
tor that is programmed by software.
TFTD14+F_C/BE2#
SLCT
C17
I
Select. Set active high by the printer when the printer is
selected.
TFTD15+F_C/BE3#
SLIN#/ASTRB# B20
O
Select Input. When low, selects the printer. This signal
is in TRI-STATE after a 0 is loaded into the corresponding
control register bit. Uses an external 4.7 K
Ω pull-up resis-
tor.
Address Strobe (EPP). Active low, used in EPP mode to
denote an address or data cycle. When the cycle is
aborted, ASTRB# becomes inactive (high).
TFTD16+
F_IRDY#
STB#/WRITE#
A22
O
Data Strobe. When low, indicates to the printer that valid
data is available at the printer port. This signal is in TRI-
STATE after a 0 is loaded into the corresponding control
register bit. An external 4.7 K
Ω pull-up resistor should be
employed.
Write Strobe. Active low, used in EPP mode to denote
an address or data cycle. When the cycle is aborted,
WRITE# becomes inactive (high).
TFTD17+
F_FRAME#
3.4.13
Parallel Port Interface Signals (Continued)
Signal Name
Ball No.
Type
Description
Mux
3.4.14
Fast Infrared (IR) Port Interface Signals
Signal Name
Ball No.
Type
Description
Mux
IRRX1
AK8
I
IR Receive. Primary input to receive serial data from the
IR transceiver. Monitored during power-off for wakeup
event detection.
Note:
If selected as IRRX1 function but not used, tie
IRRX1 high.
SIN3
IRRX2/GPIO38
K28
I
IR Receive 2. Auxiliary IR receiver input to support a
second transceiver. This input signal can be used when
GPIO38 is selected using PMR[14], and when
AUX_IRRX bit in register IRCR2 of the IR module in
internal SuperI/O is set.
LPCPD#
IRTX
C11
O
IR Transmit. IR serial output data.
SOUT3