DigiPoS PowerPoS 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 dely 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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