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3 System 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
(for SB82438FX and SB82371FB
together)
❒ 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
PCI master / slave interface
(for SB82371FB only)
❒ 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