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Figure 2-6: USB Golden Finger
2.5.5 SMBus Controller
The ATI SB600 southbridge chipset SMBus Controller is SMBus Rev. 2.0 compliant and
supports SMBALERT # signal / GPIO.
2.5.6 Interrupt Controller
The ATI SB600 southbridge interrupt controller supports the following:
IOAPIC/X-IO APIC mode for 24 channels of interrupts
8259 legacy mode for 15 interrupts
Programmable level/edge triggering on each channels
Serial interrupt on quiet and continuous modes
2.5.7 DMA Controller
The ATI SB600 southbridge has two cascaded 8237 DMA controllers that support the
following:
PC/PCI/DMA
LPC DMA
Type F DMA
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