3System Board (P/Ns D3657-63001 and D3661-63001) Principal Components and Features

The PCI/ISA Bridge and IDE Controller (SB82371FB)

The SB82371FB device serves as a bridge between the PCI bus and the ISA expansion bus, and incorporates a two-channel PCI IDE controller. It incorporates the logic for a PCI interface, a DMA interface, a DMA controller that supports fast DMA transfers, data buffers to isolate the PCI and ISA buses, Timer/Counter logic, and NMI control logic.

The SB82371FB PCI/ISA bridge also provides decode for the following peripheral devices:

•Flash BIOS

•Real Time Clock/CMOS Memory

•Keyboard/Mouse Controller

•Floppy Disk Controller

•Two Serial Ports

•One Parallel Port

•PCI Expansion Card Slots.

The SB82438FX and SB82371FB Feature Summary

Function

Features

 

 

Data buffer

❒ Provides a high performance 64-bit data path between the

(for SB82438FX and SB82371FB

processor (local) bus and main memory

together)

❒ 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

 

 

PCI master / slave interface

❒ Fully compatible with PCI specification

(for SB82371FB only)

❒ 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

 

 

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