Signal Definitions

32579B

3.4.12Serial Ports (UARTs) Interface Signals (Continued)

Signal Name

Ball No.

Type

Description

Mux

 

 

 

 

 

RI2#

AJ8

I

Ring Indicator. When low, indicates to the modem that a

GPIO11+IRQ15

 

 

 

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.

 

 

 

 

 

 

DCD2#

C28

I

Data Carrier Detected. When low, indicates that the

GPIO9+IDE_IOW1#

 

 

 

data transfer device (e.g., modem) is ready to establish a

+SDTEST2

 

 

 

communications link.

 

 

 

 

Note: If selected as DCD2# function but not used, tie

 

 

 

 

DCD2# high.

 

 

 

 

 

 

DSR2#

B29

I

Data Set Ready. When low, indicates that the data trans-

GPIO10+

 

 

 

fer device (e.g., modem) is ready to establish a communi-

IDE_IORDY1

 

 

 

cations link.

 

 

 

 

Note: If selected as DSR2# function but not used, tie

 

 

 

 

DSR2# low.

 

 

 

 

 

 

3.4.13Parallel Port Interface Signals

Signal Name

Ball No.

Type

Description

Mux

 

 

 

 

 

ACK#

B18

I

Acknowledge. Pulsed low by the printer to indicate that it

TFTDE+VOPCK+

 

 

 

has received data from the Parallel Port.

FPCICLK

 

 

 

 

 

AFD#/DSTRB#

D22

O

Automatic Feed. When low, instructs the printer to auto-

TFTD2+VOPD1+

 

 

 

matically feed a line after printing each line. This signal is

INTR_O

 

 

 

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).

 

 

 

 

 

 

BUSY/WAIT#

B17

I

Busy. Set high by the printer when it cannot accept

TFTD3+VOPD2+

 

 

 

another character.

F_C/BE1#

 

 

 

Wait. In EPP mode, the Parallel Port device uses this

 

 

 

 

active low signal to extend its access cycle.

 

 

 

 

 

 

ERR#

D21

I

Error. Set active low by the printer when it detects an

TFTD4+VOPD3+

 

 

 

error.

F_C/BE0#

 

 

 

 

 

INIT#

B21

O

Initialize. When low, initializes the printer. This signal is

TFTD5+VOPD4+

 

 

 

in TRI-STATE after a 1 is loaded into the corresponding

SMI_O

 

 

 

control register bit. Use an external 4.7 KΩ pull-up resis-

 

 

 

 

tor.

 

 

 

 

 

 

AMD Geode™ SC1200/SC1201 Processor Data Book

63

Page 63
Image 63
AMD SC1201, SC1200 manual Parallel Port Interface Signals