Soyo SY-7VCA2 User Manual

Dynamic CKE control for powering down of the SDRAM. A separate

suspend-well plane is implemented for the SDRAM control signals for

Suspend-to-DRAM operation. Coupled with the VT82C686B south bridge

chip, a complete power conscious PC motherboard can be implemented

with no external TTLs.

The Via 694X chipset is ideal for high performance, high quality, high

energy efficient and high integration desktop and notebook AGP / PCI /

ISA computer systems.

Ø VT82C686B

The VT82C686B PSIPC (PCI Super-I/O integrated Peripheral Controller)

is a high integration, high performance, power-efficient, and high

compatibility device that supports Intel and non-Intel based processor to

PCI bus bridge functionality to make a complete Microsoft PC99-

compliant PCI/ISA system In addition to complete ISA extension bus

functionality, the VT82C686B includes standard intelligent peripheral

controllers:

1) Master mode enhanced IDE controller with dual channel DMA engine

and interlaced dual channel commands. Dedicated FIFO coupled with

scatter and gather master mode operation allows high performance

transfers between PCI and IDE \devices. In addition to standard PIO and

DMA mode operation, the VT82C686B also supports the UltraDMA-33

standard to allow reliable data transfer rates up to 33MB/sec throughput.

The VT82C686B also supports the UltraDMA-66/100 standard. The

IDE controller is SFF-8038I v1.0 and Microsoft Windows-family

compliant.

2) Universal Serial Bus controller that is USB v1.1 and Universal HCI

v1.1 compliant. The VT82C686B includes the root hub with four

function ports with integrated physical layer transceivers. The USB

controller allows hot plug and play and isochronous peripherals to be

inserted into the system with universal driver support. The controller

also implements legacy keyboard and mouse support so that legacy