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H/W to S/W Interfacing
The primary ways of connecting H/W to S/W are:
- Programmed I/O to pin-level PIO register,
- Programmed I/O to FIFOs,
- Interrupts (hardwired or dynamically dispatched),
- Packet channel mapped into register file,
- DMA,
- Psudo-DMA (processor generates addresses only.