Signal Definitions

32580B

3.4.12Parallel Port Interface Signals (Continued)

Signal Name

Ball No.

Type

Description

Mux

 

 

 

 

 

STB#/WRITE#

A22

O

Data Strobe. When low, indicates to the printer that valid

TFTD17+

 

 

 

data is available at the printer port. This signal is in TRI-

F_FRAME#

 

 

 

STATE after a 0 is loaded into the corresponding control

 

 

 

 

register bit. An external 4.7 KΩ 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).

 

 

 

 

 

 

3.4.13Fast 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

SIN3

 

 

 

IR transceiver. Monitored during power-off for wakeup

 

 

 

 

event detection.

 

 

 

 

Note: If selected as IRRX1 function but not used, tie

 

 

 

 

IRRX1 high.

 

 

 

 

 

 

IRRX2/GPIO38

K28

I

IR Receive 2. Auxiliary IR receiver input to support a

LPCPD#

 

 

 

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.

 

 

 

 

 

 

IRTX

C11

O

IR Transmit. IR serial output data.

SOUT3

 

 

 

 

 

AMD Geode™ SC2200 Processor Data Book

67

Page 63
Image 63
AMD SC2200 manual Fast Infrared IR Port Interface Signals, Stb#/Write#, Fframe#, IRRX1 AK8, IRRX2/GPIO38