The 82438Fx And 82371Fb Feature Summary - HP Vectra VL5 4 Technical Reference Manual

The 82371FB PCI/ISA bridge also provides decode for the following peripheral devices:
• Flash BIOS
• Real Time Clock/CMOS Memory
• Keyboard/Mouse Controller
• Flexible Disk Controller
• Two Serial Ports
• One Parallel Port
• PCI Accessory Board Slots.

THE 82438FX AND 82371FB FEATURE SUMMARY

Function
Data buffer
(for 82438FX and 82371FB
together)
PCI master / slave interface
(for 82371FB only)
ISA bus controller
(for 82371FB only)
Fast IDE controller
(for 82371FB only)
Features
• Provides a high performance 64-bit data path between
the processor (local) bus and main memory
• Provides a 32-bit data path to the PCI bus
• Provides a 8-deep x 64-bits wide write buffer for all
processor writes to main memory
• Provides a one-level posted write buffer for all processor writes
to PCI bus memory
• Fully compatible with PCI specification
• Supports PCI-to-ISA / ISA-to-PCI bus master cycle translations
• Supports programmable memory regions to provide fast positive
decode for PCI master accesses
• Implements subtractive decoding for unclaimed PCI cycles
• Supports PCI-to-ISA posted memory writes
• Translates DMA transfers for PCI slaves
• Supports PCI address/data parity generation and checking
• Fully compatible with ISA bus standard
• Supports asynchronous ISA bus operation up to 16 MHz
• Integrates:
• two 82C37A DMA controllers
• two 82C59A interrupt controllers
• 82C54 timer
• hidden ISA refresh controller
• support for BIOS
• port A, B and NMI logic
• Supports PIO and Bus Master IDE
• Supports up to Mode 4 timings
• Up to 22 MB/s transfer rate
• 8×32-bit buffer for Bus Master IDE PCI burst transfers