HP Vectra 500 Series - Manual (Page 53)

53
2 System Board - (SiS Chipset) (Part Number: D4051-63001)
Devices on the ISA Bus
Feature Summary
Function Features
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
❒ New high-performance internal digital data separator (no
external filter components required)
❒ Low-power CMOS with enhanced power-down mode
❒ Automatic media-sense support
UARTs ❒ Software compatible with the PC16550A and PC16450
❒ A modifiable address that is referenced by a 16-bit programma-
ble register.
❒ 13 IRQ channel options.
❒ Shadow register support for write-only bits.
❒ Four 8-bit DMA options for UART2.
Bidirectional parallel port ❒ Enhanced Parallel Port (EPP) compatible
❒ Extended Capabilities Port (ECP) compatible
❒ Bidirectional under either software or hardware control
❒ Demand mode DMA support.
❒ Selection of internal pull-up or pull-down resistor for Paper End
(PE) pin.
❒ Reduction of PCI bus utilization by supporting a demand DMA
mode mechanism and a DMA fairness mechanism.
❒ Includes protection circuit against damage caused when printer
is switched on, or operated at higher voltages.
❒ Output buffers that can sink and source 14 mA.
Three general purpose pins for three
separate chip select signals ❒ Programmed for game port control.
❒ Chip Select 0 (CS0) signal produces open drain and is powered
by the V
CCH
.
❒ Chip Select 1 (CS1) and 2 (CS2) signals have push-pull buffers
and are powered by the main V
DD
.
❒ Decoding of chip select signals depends on the address and the
Address Enable (AEN) signal, and can be qualified using the
Read (RD) and Write (WR) signals.
Enhanced power management ❒ Special configuration registers for power down
❒ Reduced current leakage from pins.
❒ Low-power CMOS technology.
❒ Ability to shut off clocks to all modules.