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13 parallel port interface signals – AMD Geode SC1201 User Manual

Page 63

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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 K

Ω 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 K

Ω pull-up resis-

tor.

TFTD5+VOPD4+

SMI_O

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