Supero Super P6DNF, User Manual

Page: 18 / 106

1-10
SUPER P6DNF/P6SNF User’s Manual
1-4 National Semiconductor Super I/O Controller
The National Semiconductor 87306 Super I/O Controller incorpo-
rates an IDE control logic, two full function serial ports, an IEEE
1284 parallel port, industry standard floppy disk controller with 16
byte FIFO, Real Time Clock and an 8042 compatible keyboard con-
troller all in one chip.
The IDE interfaces provide up to Mode 4 support. The two serial
ports are software compatible with the Fast UART 16550. The par-
allel port is EPP (Enhanced Parallel Port) and ECP (Extended Ca-
pabilities Port) compatible, including level 2 support. It includes a
protection circuit against damage caused when the printer is pow-
ered up. EPP mode provides for greater throughput than Compat-
ible or Extended modes by supporting faster transfer rates and a
mechanism that allows the host to address peripheral device regis-
ters directly. Faster transfers are achieved by automatically gener-
ating the address and data strobes. EPP is compatible with both
Compatible and Extended mode parallel-port devices.
1-5 Voltage Regulator Modules (VRM)
The Voltage Regulator Module (VRM1 and VRM2) is a DC-to-DC
converter with a standardized interface to the system. The stan-
dardization allows a variety of Voltage Regulator Modules to support
the Pentium Pro processor family and to provide a cost effective
support for CPU upgrade.