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Chapter 3 Hardware Description
3.8 Onboard PCI EIDE
The PCI EIDE controller is part of the 430TX PCIset. 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 controller also supports Ultra DMA/33, a new "synchronous
DMA" protocol featured in PIIX4. It is built on Intel's existing 16MB/s
Bus Master interface to improve disk I/O throughput to 33MB/s. It uses
both edges of data strobe to obtain 2X speed across the cable and is
backward compatible with today's drives. It also has 16-bit CRC error
detection across the cable for improved integrity.
3.9 Onboard Multi-I/O
The onboard multi-I/O chip, Winbond W83977, 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.
3.10 System Hardware Monitor Device (optional)
The System Hardware Monitor Device (from National Semiconductor)
allows the system to track the PC health through hardware monitoring
of the system and CPU temperature, voltage levels, and CPU and
chassis fans to ensure the system's normal operation.
AI5TT Pentium Baby AT Motherboard User's Manual
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