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PC87303VUL Datasheet

  • PC87303VUL

  • PC87303VUL SuperI/OTM Sidewinder Lite Floppy Disk Controller...

  • 114頁(yè)

  • NSC

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PC87303VUL SuperI O Sidewinder Lite Floppy Disk Controller Keyboard Controller
Real-Time Clock Dual UARTs IEEE 1284 Parallel Port and IDE Interface
PRELIMINARY
February 1995
PC87303VUL SuperI O
TM
Sidewinder Lite
Floppy Disk Controller Keyboard Controller
Real-Time Clock Dual UARTs IEEE 1284 Parallel Port
and IDE Interface
General Description
The PC87303VUL is a single chip solution incorporating a
Keyboard and PS 2 Mouse Controller (KBC) Real Time
Clock (RTC) and most commonly used I O peripherals in
ISA EISA and MicroChannel based computers In addition
to the KBC and RTC a Floppy Disk Controller (FDC) two
full featured UARTs an IEEE 1284 compatible parallel port
and all the necessary control logic for an IDE interface pro-
vides support for most commonly used I O peripherals
Standard PC-AT address decoding for all the peripherals
a set of configuration registers and two user selectable chip
selects are also implemented in this highly integrated mem-
ber of the SuperI O family The advanced features and high
integration of the PC87303 result in several benefits for low
cost high performance systems Printed circuit board space
savings fewer components on the motherboard and com-
patibility with the latest industry standard peripherals are
only a few of the benefits of using a PC87303
The KBC is fully software compatible with the 8042AH mi-
crocontroller It contains system timing control logic cus-
tom ROM program memory RAM data memory and 18 pro-
grammable I O lines necessary to implement dedicated
control functions It is an efficient controller which uses pre-
dominantly single byte instructions with support for binary and
BCD arithmetic and extensive bit handling capabilities
(Continued)
Features
Y
Y
The Floppy Disk Controller
Software compatible with the DP8477 the 765A and
the N82077
16-byte FIFO (disabled by default)
Burst and Non-Burst modes
Perpendicular Recording drive support
High performance internal analog data separator
(no external filter components required)
Low power CMOS with power-down mode
Automatic media-sense support with full IBM TDR
(Tape Drive Register) implementation for PC-AT and
PS 2 floppy drive types
The Keyboard Controller
8042AH and PC87911 software compatible
8-bit Microcomputer with 2 kbytes custom ROM and
256 bytes data RAM
Asynchronous access to two data registers and one
status register during normal operation
Dedicated open drain outputs for keyboard controller
application
Supports both interrupt and polling
Supports DMA handshake
18 programmable I O pins
4 dedicated open-drain outputs
8-bit Timer Counter
Binary and BCD arithmetic
Expandable I O
(Continued)
Block Diagram
TL C 12074 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corporation
SuperI O
TM
is a trademark of National Semiconductor Corporation
MicroChannel PC-AT and PS 2 are registered trademarks of International Business Machines Corporation
C
1995 National Semiconductor Corporation
TL C 12074
RRD-B30M75 Printed in U S A

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