
Chapter 3 Hardware Description
10
TI6VG4 User’s Manual
3.8 Interrupt Request (IRQ) Lines
There is a total of 15 IRQ lines available on the motherboard. Peripheral
devices use an interrupt request to notify the CPU for the service
required. The following table shows the IRQ lines used by the devices on
the motherboard:
Level Function
IRQ0
System Timer Output
IRQ1
Keyboard
IRQ2
Interrupt
Cascade
IRQ8
Real Time Clock
IRQ9
Software Redirected to Int 0Ah
IRQ10
Reserved
IRQ11
Reserved
IRQ12
Reserved
IRQ13
Co-Processor
IRQ14
Primary
IDE
IRQ15
Secondary
IDE
IRQ3
INTERRUPT
IRQ4
Serial Port #1
IRQ5
INTERRUPT
IRQ6
Floppy Disk Controller
IRQ7
Parallel Port #1
3.9 Onboard PCI-IDE
The PCI-IDE controller, integrated in the VIA chipset, supports PIO
mode 3/4 and bus mastering Ultra DMA33/66. Using HDDs that support
Ultra DMA33/66, hard drive data transfer speed is increased for better
overall system performance. There are two IDE connectors - primary
IDE and secondary IDE. With two devices per connector, up to four IDE
devices can be supported.
3.10 DMA Channels
There are seven DMA channels available on the motherboard. Only
DMA2 is used by the floppy controller. In the case that ECP mode on the
parallel port is utilized, DMA1 or DMA3 will be used.
Содержание TI6VG4
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