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PC87322VF
(Super I/O III) Floppy Disk Controller with Dual UARTs, Enhanced Parallel Port and IDE Interface
TL/C/11870
PC87322VF
(SuperI/O
III)
Floppy
Disk
Controller
with
Dual
UARTs,
Enhanced
Parallel
Port,
and
IDE
Interface
PRELIMINARY
June 1994
PC87322VF (SuperI/OTM III)
Floppy Disk Controller with Dual UARTs,
Enhanced Parallel Port, and IDE Interface
General Description
The PC87322VF incorporatesa Floppy Disk Controller
(FDC),twofull function UARTs,an enhanced parallel port,
andIDE interface control logicinone chip.The PC87322VF
includes standardAT address decodingfor on-chip func-
tionsanda Configuration Registerset, offeringa singlechip
solutiontothe most commonly used ISA, EISAand Micro-
ChannelÉ peripherals.
The on-chip FDCis software compatibletothe PC8477,
which containsa supersetof the mDP8473 and NEC
mPD765 andthe N82077 floppy disk controller functions.
The on-chip analog data separator requiresno external
componentsand supportsthe4MB drive formataswellas
the other standard floppy drives used with 5.25× and 3.5×
media. Automatic media sense supportis provided. the PC87322VF the UARTs are equivalentto two
NS16450sor PC16550s. The bidirectional parallel port
maintains complete compatibility withthe ISA, EISA and
MicroChannel parallel ports. The enhanced parallel portis
compatible withthe IEEE 1284 standard,and also supports
EPPVer1.7.
The IDE control logic providesa complete IDE interface,
with DMA support, exceptforthe signal buffers.The Config-
uration Registers consistoffive byte-wide registers.AnIn-
dexanda Data Register whichcanbe relocated withinthe
ISAI/O address space accessthe Configuration Registers.
Features 100% compatible with ISA, EISA,and MicroChannel
architectures Floppy Disk Controller Software compatible withthe DP8473,the 765A and
the N82077 16-byte FIFO (default disabled) Burstand 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 softwareor hardware
control Compatible with ISA, EISA,and MicroChannel
architectures Abilityto multiplex FDC signalson parallel port pins
for external FDC Includes protection circuit against damage caused
when printeris powered-up TheIDE Control Logic Providesa completeIDE interface with DMA control
(exceptfor optional buffers) The Address Decoder Provides selectionofall primary and secondary ISA
addresses including COM 1–4 100-pin PQFP packageThe PC87322VFispin compatible withthe PC87312
Block Diagram
TL/C/11870–1
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
IBMÉ, MicroChannelÉand PS/2Éare registeredtrademarksof InternationalBusiness MachinesCorporation.
SuperI/OTMisa trademark ofNationalSemiconductor Corporation.a registeredtrademarkofInternational BusinessMachinesCorporation.
C1995National SemiconductorCorporation RRD-B30M65/PrintedinU.S.A.
