Theory of Operation 4-15
functions. All popular 5.25-inch and 3.5-inch floppy disk drives, including the 2.88 MB,
3.5-inch floppy disk 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 1.0 SIR (with data rate of 115.2 Kbps), IrDA
1.1 MIR and FIR (with data rate of 1.152 Mbps and 4.0 Mbps respectively), and Sharp
SIR (with data rate of 38.4 Kbps respectively) compliant signaling protocol.
The parallel port is fully IEEE 1284 level 2 compatible. The SPP (Standard Parallel Port)
is fully compatible with 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 PC87338. 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 PC87338 to enter
extremely low power modes under software control. The PC87338 operates at a 3.3/5V
power supply.
4.2.7.1.1 PC87338 Features
♦100% compatible with ISA, and EISA architectures
♦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
♦Bidirectional Parallel Port
♦Enhanced Parallel Port (EPP) compatible