DigiPoS PowerPoS & Millennium Technical Manual
VIA 82C686B ‘South Bridge’
Incorporating:
• PCI Expansion Slots
• ISA Expansion Slots
• IDE Ports
• Keyboard & Mouse Ports
• RS232 ‘Serial’ Ports
• Parallel Port
• USB Ports
• Hardware Monitoring
• Motherboard Resources
PCI to ISA Bridge
• Integrated ISA Bus Controller with integrated DMA, timer, and interrupt
controller
• Integrated Keyboard Controller with PS2 mouse support
• Integrated DS12885-style Real Time Clock with extended 256byte
CMOS RAM and Day/Month Alarm for ACPI
• Integrated USB Controller with root hub for 2 ports
• Integrated UltraDMA-33/66/100 master mode EIDE controller with
enhanced PCI bus commands
• PCI-2.2 compliant with delay transaction and remote power management
• Eight double-word line buffer between PCI and ISA bus
• One level of PCI to ISA post-write buffer
• Supports type F DMA transfers
• Distributed DMA support for ISA legacy DMA across the PCI bus
• Serial interrupt for docking and non-docking applications
• Fast reset and Gate A20 operation
• Edge trigger or level sensitive interrupt
• Flash EPROM, 4Mb EPROM and combined BIOS support
• Supports positive and subtractive decoding
UltraDMA-33 / 66 / 100 Master Mode PCI EIDE Controller
• Dual channel master mode PCI supporting multiple Enhanced IDE
devices
• Transfer rate up to 33MB/sec to cover PIO mode 4, multi-word DMA
mode 2 drives, and UltraDMA-33 interface
• Increased reliability using UltraDMA-66 transfer protocols
• Increased performance using UltraDMA-100 mode 5
• Thirty-two levels (double words) of pre-fetch and write buffers
• Dual DMA engine for concurrent dual channel operation
• Bus master programming interface for SFF-8038I rev.1.0 and Windows-
95 compliant
• Full scatter gather capability
• Support ATAPI compliant devices including DVD devices
• Support PCI native and ATA compatibility modes
• Complete software driver support
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