SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 117

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Datasheet
Chapter 9 Parallel Port
SMSC SCH311X
DATA PORT
STATUS
PORT
CONTROL
PORT
EPP ADDR
PORT
EPP DATA
PORT 0
EPP DATA
PORT 1
EPP DATA
PORT 2
EPP DATA
PORT 3
Notes:
1. These registers are available in all modes.
2. These registers are only available in EPP mode.
The SCH311X incorporates an IBM XT/AT compatible parallel port. This supports the optional PS/2
type bi-directional parallel port (SPP), the Enhanced Parallel Port (EPP) and the Extended Capabilities
Port (ECP) parallel port modes. Refer to the Configuration Registers for information on disabling,
power- down, changing the base address of the parallel port, and selecting the mode of operation.
The parallel port also incorporates SMSC’s ChiProtect circuitry, which prevents possible damage to the
parallel port due to printer power-up.
The functionality of the Parallel Port is achieved through the use of eight addressable ports, with their
associated registers and control gating. The control and data port are read/write by the CPU, the status
port is read/write in the EPP mode. The address map of the Parallel Port is shown below:
DATA PORT
STATUS PORT
CONTROL PORT
EPP ADDR PORT
EPP DATA PORT 0
EPP DATA PORT 1
EPP DATA PORT 2
EPP DATA PORT 3
The bit map of these registers is:
D0
PD0
TMOUT
STROBE
PD0
PD0
PD0
PD0
PD0
D1
PD1
0
AUTOFD
PD1
PD1
PD1
PD1
PD1
D2
PD2
0
nINIT
PD2
PD2
PD2
PD2
PD2
BASE ADDRESS + 00H
BASE ADDRESS + 01H
BASE ADDRESS + 02H
BASE ADDRESS + 03H
BASE ADDRESS + 04H
BASE ADDRESS + 05H
BASE ADDRESS + 06H
BASE ADDRESS + 07H
DATASHEET
D3
PD3
nERR
SLC
PD3
PD3
PD3
PD3
PD3
101
D4
PD4
SLCT
IRQE
PD4
PD4
PD4
PD4
PD4
D5
PD5
PE
PCD
PD5
PD5
PD5
PD5
PD5
D6
PD6
nACK
0
PD6
PD6
PD6
PD6
PD6
D7
PD7
nBUSY
0
PD7
PD7
PD7
PD7
PD7
Rev 0.2 (09-28-04)
NOTE
1
1
1
2
2
2
2
2