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PC87322VF Datasheet

  • PC87322VF

  • Floppy Disk Controller with Dual UARTs, Enhanced Parallel Po...

  • 84頁(yè)

  • NSC

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PC87322VF (SuperI O III) Floppy Disk Controller
with Dual UARTs Enhanced Parallel Port and IDE Interface
PRELIMINARY
June 1994
PC87322VF (SuperI O
TM
III)
Floppy Disk Controller with Dual UARTs
Enhanced Parallel Port and IDE Interface
General Description
The PC87322VF incorporates a Floppy Disk Controller
(FDC) two full function UARTs an enhanced parallel port
and IDE interface control logic in one chip The PC87322VF
includes standard AT address decoding for on-chip func-
tions and a Configuration Register set offering a single chip
solution to the most commonly used ISA EISA and Micro-
Channel peripherals
The on-chip FDC is software compatible to the PC8477
which contains a superset of the
mDP8473
and NEC
mPD765
and the N82077 floppy disk controller functions
The on-chip analog data separator requires no external
components and supports the 4 MB drive format as well as
the other standard floppy drives used with 5 25 and 3 5
media Automatic media sense support is provided
In the PC87322VF the UARTs are equivalent to two
NS16450s or PC16550s The bidirectional parallel port
maintains complete compatibility with the ISA EISA and
MicroChannel parallel ports The enhanced parallel port is
compatible with the IEEE 1284 standard and also supports
EPP Ver 1 7
The IDE control logic provides a complete IDE interface
with DMA support except for the signal buffers The Config-
uration Registers consist of five byte-wide registers An In-
dex and a Data Register which can be relocated within the
ISA I O address space access the Configuration Registers
Y
Y
Y
Y
Y
Features
Y
100% compatible with ISA EISA and MicroChannel
architectures
Y
Floppy Disk Controller
Software compatible with the DP8473 the 765A and
the N82077
16-byte FIFO (default disabled)
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
The UARTs
Software compatible with the PC16550A and
PC16450
The Bidirectional Parallel Port
Enhanced Parallel Port (EPP) compatible
Bidirectional under either software or hardware
control
Compatible with ISA EISA and MicroChannel
architectures
Ability to multiplex FDC signals on parallel port pins
for external FDC
Includes protection circuit against damage caused
when printer is powered-up
The IDE Control Logic
Provides a complete IDE interface with DMA control
(except for optional buffers)
The Address Decoder
Provides selection of all primary and secondary ISA
addresses including COM 1 鈥?4
100-pin PQFP package
The PC87322VF is pin compatible with the PC87312
Block Diagram
TL C 11870 鈥?1
TRI-STATE is a registered trademark of National Semiconductor Corporation
IBM MicroChannel and PS 2 are registered trademarks of International Business Machines Corporation
SuperI O
TM
is a trademark of National Semiconductor Corporation
is a registered trademark of International Business Machines Corporation
C
1995 National Semiconductor Corporation
TL C 11870
RRD-B30M65 Printed in U S A

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