MiTAC 8355 service manual 3.2 VT8235

8355 N/B MAINTENANCE

1.2.3.2 VT8235

The VT8235 South Bridge is a high integration, high performance, power-efficient, and high compatibility device that supports Intel and non-Intel based processor to V-Link bus bridge functionality to make a complete Microsoft PC2001-compliant PCI/LPC system. The VT8235 includes standard intelligent peripheral controllers:

a)IEEE 802.3 compliant 10 / 100 Mbps PCI bus master Ethernet MAC with standard MII interface to external PHYceiver.

b)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 VT8235 also supports the UltraDMA-133, 100, 66, and 33 standards to allow reliable data transfer at rates up to 133 MB/sec. The IDE controller is SFF-8038i v1.0 and Microsoft Windows-family compliant.

c)Universal Serial Bus controller that is USB v2.0 / 1.1 and Universal HCI v2.0 / 1.1 compliant. The VT8235 includes three root hubs with six 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 software can run transparently in a non-USB-aware operating system environment.

d)Keyboard controller with PS2 mouse support.

e)Real Time Clock with 256 byte extended CMOS. In addition to the standard ISA RTC functionality, the integrated RTC also includes the date alarm, century field, and other enhancements for compatibility with the ACPI standard.

15