SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 71

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

Revision 3.0
Signal Definitions
2.4.12 Parallel Port Interface Signals
Signal Name
ACK#
AFD#/DSTRB#
BUSY/WAIT#
ERR#
INIT#
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
PE
SLCT
SLIN#/ASTRB#
EBGA
AB2
AA3
AA1
W2
W3
W1
U3
Y3
U1
V3
V2
V1
Y1
T1
T3
T4
(Continued)
Ball No.
TEPBGA
D22
D21
C19
C18
C20
D20
C21
D17
C17
B18
B17
B21
A18
A20
A21
B20
Type
I/O
O
O
O
I
I
I
I
I
Description
Acknowledge. Pulsed low by the printer to
indicate that it has received data from the Par-
allel Port.
Automatic Feed. When low, instructs the
printer to automatically feed a line after print-
ing each line. This signal is in TRI-STATE
after a 0 is loaded into the corresponding
control register bit. An external 4.7 K
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. 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.
Error. Set active low by the printer when it
detects an error.
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 pull-up resistor.
Parallel Port Data. Transfer data to and from
the peripheral data bus and the appropriate
Parallel Port data register. These signals
have a high current drive capability.
Paper End. Set high by the printer when it is
out of paper.
This ball has an internal weak pull-up or pull-
down resistor that is programmed by soft-
ware.
Select. Set active high by the printer when
the printer is selected.
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
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).
71
pull-up resistor.
pull-
TFTD14+F_C/BE2#
TFTD15+F_C/BE3#
TFTD3+F_C/BE1#
TFTD4+F_C/BE0#
TFTDE+FPCICLK
TFTD2+INTR_O
TFTD13+F_AD7
TFTD11+F_AD5
TFTD10+F_AD4
TFTD5+SMI_O
TFTD1+F_AD6
TFTD9+F_AD3
TFTD8+F_AD2
TFTD7+F_AD1
TFTD6+F_AD0
TFTD16+
F_IRDY#
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