3
Features
(Continued)
www.national.com
Revision 1.1
P
■
Configuration Control
—
PnP Configuration Register structure
—
PC01SpecificationRevision1.0,1999-2000
compliant
—
Base Address strap (BADDR) to setup the address
of the Index-Data register pair (defaults to 2Eh/2Fh)
—
Flexible resource allocation for all logical devices:
Relocatable base address
15 IRQ routing options to serial IRQ
Up to four optional 8-bit DMA channels
—
Configurable feature sets:
Software selectable
V
SB3
-powered pin multiplexing
Legacy Modules
■
Serial Ports 1 and 2
—
Software-compatible with the NS16550A and NS16450
—
Support shadow register for write-only bit monitoring
—
Data rates up to 1.5 Mbaud
■
Serial Infrared Port (SIR)
—
Software compatible with the 16550A and the 16450
—
Shadow register support for write-only bit monitoring
—
HP-SIR
—
ASK-IR option of SHARP-IR
—
DASK-IR option of SHARP-IR
—
Consumer Remote Control supports RC-5, RC-6,
NEC, RCA and RECS 80
■
IEEE 1284-compliant Parallel Port
—
ECPwithLevel2(14mAsinkandsourceoutputbuffers)
—
Software or hardware control
—
Enhanced Parallel Port (EPP) compatible with EPP
1.7 and EPP 1.9
—
Supports EPP as mode 4 of the Extended Control
Register (ECR)
—
Selection of internal pull-up or pull-down resistor for
Paper End (PE) pin
—
Supports a demand DMA mode mechanism and a
DMA fairness mechanism for improved bus utilization
—
Protection circuit that prevents damage to the
parallel port when a printer connected to it is pow-
ered up or is operated at high voltages (in both
cases, even if the PC8374L is in power-down state)
■
Floppy Disk Controller (FDC)
—
Software compatible with the PC8477 (the PC8477
contains a superset of the FDC functions in the
μ
DP8473, NEC
μ
PD765A/B and N82077 devices)
—
Error-free handling of data overrun and underrun
—
Programmable write protect
—
Supports FM and MFM modes
—
Supports Enhanced mode command for three-mode
Floppy Disk Drive (FDD)
—
Perpendicular recording drive support for 2.88 MBytes
—
Burst (16-byte FIFO) and Non-Burst modes
—
Full support for IBM Tape Drive Register (TDR) im-
plementation of AT and PS/2 drive types
—
High-performance digital separator
—
Supports fast tape drives (2 Mbps) and standard
tape drives (1 Mbps, 500 Kbps and 250 Kbps)
■
Keyboard and Mouse Controller (KBC)
—
8-bit
microcontroller,
8042AH and PC87911
—
Standard interface (60h, 64h, IRQ1 and IRQ12)
—
Supports two external swapable PS/2 interfaces for
keyboard and mouse
—
Programmable, dedicated quasi-bidirectional I/O
lines (GA20/P21, KBRST/P20)
software
compatible
with
Clocking, Supply, and Package Information
■
Clocks
—
LPC (PCI) clock input (up to 33 MHz)
—
On-chip Clock Generator:
Generates 48 MHz clock
Generates 32.768 KHz internal clock
V
SB3
powered
Based on the 14.31818 MHz clock input
■
Protection
—
All pins are 5V tolerant and back-drive protected
(except LPC bus pins)
—
High ESD protection of all the pins
—
Pin multiplexing selection lock
—
Configuration register lock
■
Testability
—
XOR tree structure
Includes all the pins (except supply, analog and not
connected pins)
Selected at power-up by strap input (TEST)
—
TRI-STATE pins, selected at power-up by strap input
(TRIS)
■
Power Supply
—
3.3V supply operation
—
Separate pin pairs for main (V
DD3
) and standby
(V
SB3
) power supplies
—
Backup battery input (V
BAT
) for SWC indications
—
Low standby power consumption
—
Very low power consumption from backup battery
(less than 0.5
μ
A)
■
Package
—
128-pin PQFP
Winbond Electronics Corp. Advanced PC Product Center