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Chapter 1 21
Southbridge Chipset
Item Specification
Chipset SB820M
Package
Features *Processor Interface
Supports AMD mobile processors code-named “Champlain,” and “Geneva.”
*A-Link Express II interface to Northbridges
1-, 2-, or 4-lane A-Link Express II
*interface
Automatic detection of lane configuration on boot-up
Dynamic lane width up/down configuration on detecting bandwidth
requirement Supports transfer rate of up to 2.5 GT/s per lane.
*PCI ExpressR Controller
Two-lane PCI ExpressR (PCIeR) 1.x interface, supporting up to two general
purpose devices. Supported configurations include:
1x2
2x1
*PCI Host Bus Controller
Supports PCI bus at 33MHz
Supports PCI Rev. 2.3 specification
Supports up to 4 bus master devices
Supports 40-bit addressing
Interrupt steering supported for plugn-play devices
Supports concurrent PCI operations BIOS/hardware support to hide PCI device
Supports spread spectrum
*USB Controllers
4 OHCI and 3 EHCI host controllers to support 14 USB 2.0 ports and 2 dedicated
USB 1.1 ports
Supports ACPI S1 ~ S5 Supports legacy keyboard/mouse
USB debug port
*Supports port disable with individual control
*SMBus Controller
Supports SMBALERT # signal
*Interrupt Controller
Supports IOAPIC/X-IO APIC mode for 24 channels of interrupts
Supports 8259 legacy mode for 15 interrupts
Supports programmable level/edge triggering on each channels
Supports serial interrupt on quiet and continuous modes
*DMA Controller
Two cascaded 8237 DMA controllers
Supports LPC DMA
Supports type F DMA
*LPC host bus Controller
Supports LPC-based super I/O and flash devices
Supports two master/DMA devices
Supports TPM version 1.1/1.2 devices for enhanced security
Supports SPI devices and SPI ROM sharing
Supports a maximum SPI ROM size of 16MB