Intel AI5VG Onboard PCI EIDE, Onboard Multi-I/O, Onboard CPU Temperature Sensor, Power Management

Chapter 3 Hardware Description

3. Power Management

The power management feature provides power savings by slowing down the CPU clock, turning off the monitor screen and stopping the HDD spindle motor.

3.5 Onboard PCI EIDE

The PCI EIDE controller is part of the VP3AT chipset. It supports PIO mode 3/4 and bus mastering . The peak transfer rate of PIO mode 3/4 can be as high as 17MB/sec. Using HDDs that support bus mastering, the peak transfer rate can reach 22MB/sec. There are two IDE connectors, primary IDE and secondary IDE. With two devices per connector, up to four IDE drives are supported. The VP3AT also supports Ultra DMA/33, a new “synchronous DMA” protocol for faster data transfers.

3.6 Onboard Multi-I/O

The onboard multi-I/O chip, Winbond W83877, supports two 16550 UART-compatible serial ports, one high speed EPP/ECP parallel port and one floppy controller. The floppy controller supports 2.88MB format. The I/O port addresses of the serial and parallel ports are programmable via BIOS set-up.

3.7 Onboard CPU Temperature Sensor

The AD22105 IC on the motherboard is a temperature sensor for the CPU. When the CPU temperature exceeds threshold value, the CPU slows down automatically to allow it to cool down to a safe level.

AI5VG Pentium VP3 Baby AT Motherboard User’s Manual 9