www.national.com
138
Revision 3.0
G
SuperI/O Module
(Continued)
4.8
This section briefly describes the following blocks that pro-
vide legacy device functions:
LEGACY FUNCTIONAL BLOCKS
Parallel Port.
Serial Port 1 and Serial Port 2 (SP1 and SP2), UART
functionality for both SP1 and SP2.
Infrared Communications Port / Serial Port 3 function-
ality.
Notes
SP1 and SP2 are similar to SCC1 in the National
PC87338 device.
The Parallel Port is similar to Parallel Port in the National
PC87338 device.
The IR Communications Port is similar to SCC2 in the
National PC87338 device.
The description of each Legacy block includes a general
description, register maps, and bit maps. For more informa-
tion about legacy blocks, contact your National Semicon-
ductor representative.
4.8.1
The Parallel Port supports all IEEE1284 standard commu-
nication modes: Compatibility (known also as Standard or
SPP), Bidirectional (known also as PS/2), FIFO, EPP
(known also as Mode 4) and ECP (with an optional
Extended ECP mode).
Parallel Port
4.8.1.1
The Parallel Port register maps (Table 4-33 and Table 4-34)
are grouped according to first and second level offsets.
EPP and second level offset registers are available only
when the base address is 8-byte aligned.
Parallel Port Register and Bit Maps
Parallel Port functional block bit maps are shown in Table 4-
35 and Table 4-36.
Table 4-33. Parallel Port Register Map for First Level Offset
First Level Offset
Type
Name
Modes (ECR Bits) 7 6 5
000h
R/W
DATAR.
PP Data
000 or 001
000h
W
AFIFO.
ECP Address FIFO
011
001h
RO
DSR.
Status
All Modes
002h
R/W
DCR.
Control
All Modes
003h
R/W
ADDR.
EPP Address
100
004h
R/W
DATA0.
EPP Data Port 0
100
005h
R/W
DATA1.
EPP Data Port 1
100
006h
R/W
DATA2.
EPP Data Port 2
100
007h
R/W
DATA3.
EPP Data Port 3
100
400h
W
CFIFO.
PP Data FIFO
010
400h
R/W
DFIFO.
ECP Data FIFO
011
400h
R/W
TFIFO.
Test FIFO
110
400h
RO
CNFGA.
Configuration A
111
401h
RO
CNFGB.
Configuration B
111
402h
R/W
ECR.
Extended Control
All Modes
403h
R/W
EIR.
Extended Index
All Modes
404h
R/W
EDR.
Extended Data
All Modes
405h
R/W
EAR.
Extended Auxiliary Status
All Modes
Table 4-34. Parallel Port Register Map for Second Level Offset
Second Level Offset
Type
Name
00h
R/W
Control0.
Control Register 0
02h
R/W
Control2.
Control Register 2
04h
R/W
Control4.
Control Register 4
05h
R/W
PP Confg0.
Parallel Port Configuration Register 0