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EISA-bus Interface Overview
The Extended Industry Standard Architecture (EISA) bus standard is an enhancement of the ISA (Industry Standard Architecture) bus standard developed by IBM for the PC/AT. EISA is backward compatible with ISA. It expands the ISA data bus from 16 bits to 32 bits and adds 23 address lines and 16 indicator and control lines.
The EISA bus supports:
- All ISA transfers (except ISA-bus masters)
- EISA-bus master devices
- Burst-mode DMA transfers
- 32-bit memory data and address path
- Peer-to-peer card communication
- Dynamic bus sizing (that is, 32-bit bus master to 16-bit memory)
- Initialization
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- EISA-Bus Locked Cycles
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- EISA-Bus Request Arbitration
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- EISA-Bus Interrupts
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- EISA-Bus Data Transfers
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- EISA-Bus Address Space
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- Byte Swapping
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