AMD Geode SC2200 Data Book page 62

32580B
3.4.12 Parallel Port Interface Signals
Signal Name Ball No.
ACK# B18
AFD#/DSTRB# D22
BUSY/WAIT# B17
ERR# D21
INIT# B21
PD7 A18
PD6 A20
PD5 C19
PD4 C18
PD3 C20
PD2 D20
PD1 A21
PD0 C21
PE D17
SLCT C17
SLIN#/ASTRB# B20
66
Type Description
I Acknowledge. Pulsed low by the printer to indicate that it
has received data from the Parallel Port.
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).
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.
I Error. Set active low by the printer when it detects an
error.
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.
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.
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.
I Select. Set active high by the printer when the printer is
selected.
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 KΩ 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).
Signal Definitions
TFTDE+FPCICLK
TFTD2+INTR_O
TFTD3+F_C/BE1#
TFTD4+F_C/BE0#
TFTD5+SMI_O
TFTD13+F_AD7
TFTD1+F_AD6
TFTD11+F_AD5
TFTD10+F_AD4
TFTD9+F_AD3
TFTD8+F_AD2
TFTD7+F_AD1
TFTD6+F_AD0
TFTD14+F_C/BE2#
TFTD15+F_C/BE3#
TFTD16+
F_IRDY#
AMD Geode™ SC2200 Processor Data Book
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