Major Chips Description 2-75
2.7 NS87336VJG Super I/O Controller
The PC87336VJG is a single chip solution for most commonly used I/O peripherals in ISA, and
EISA based computers. It incorporates a Floppy Disk Controller(FDC), two full featured UARTs,
and an IEEE 1284 compatible parallel port Standard PC-AT address decoding for all the
peripherals and a set of configuration registers are also implemented in this highly integrated
member of the Super l/O family. Advanced power management features, mixed voltage operation
and integrated Serial-lnfrared(both IrDA and Sharp) support makes the PC87336 an ideal choice
for low-power and/or portable personal computer applications.
The PC87336 FDC uses a high performance digital data separator eliminating the need for any
external filter components. It is fully compatible with the PC8477 and incorporates a superset of
DP8473, NEC PD765 and N82077 floppy disk controller functions. All popular 5.25” and 3.5”
floppy drives, including the 2.88 MB 3.5” floppy drive, are supported. In addition, automatic media
sense and 2 Mbps tape drive support are provided by the FDC.
The two UARTs are fully NS16450 and NS16550 compatible. Both ports support MIDI baud rates
and one port also supports IrDA’s the HP SIR and Sharp SIR compliant signaling protocol.
The parallel port is fully IEEE 1284 level 2 compatible. The SPP(Standard Parallel Port) is fully
compatible wit ISA and EISA parallel ports. In addition to the SPP, EPP(Enhanced Parallel Port)
and ECP(Extended Capabilities Port) modes are supported by the parallel port.
A set of configuration registers are provided to control the Plug and Play and other various
functions of the PC87336. These registers are accessed using two 8-bit wide index and data
registers. The ISA I/O address of the register pair can be relocated using a power-up strapping
option and the software configuration after power-up.
When idle, advanced power management features allows the PC87336 to enter extremely low
power modes under software control. The PC87336 can operate from a 5V or a 3.3V power
supply. An unique I/O cell structure allows the PC87336 to interface directly with 5V external
components while operating from a 3.3V power supply.

2.7.1 Features

• 100% compatible with ISA, and EISA architectures• The Floppy Disk Controller:
• Software compatible with the DP8473, the 765A and the N82077
• 16-byte FlFO(disabled by default)
• Burst and Non-Burst modes
• Perpendicular Recording drive support
• New high-performance internal digital data separator(no external filter components
required)
• Low-power CMOS with enhanced power-down mode
• Automatic media-sense support, with full IBM TDR(Tape Drive Register) implementation
• Supports fast 2 Mbps and standard 1 Mbps/500 kbps/250 kbps tape drives