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CPM Hints
CPM/CPU INTERACTION
•Host Commands from CPU
⋅ Change state of SCC Channel
⋅ Initialize SCC Channel
⋅ Consist of microcode routines which change state
of microcode or SCC state machine.
•Buffer Descriptors
⋅ Give RISC data to transmit.
⋅ Tell RISC where to store received data.
⋅ Report transmit or receive errors.
•Event Registers
⋅ Hardware or microcode generated events
⋅ Can generate an interrupt to the CPU
•Configuration Registers
⋅ Determine the operation mode of the SCC
⋅ Generate Clocking
⋅ Determine the Physical Interface
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