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This performs transfers and provides responses for MS=0, 1, 2
and 3, and optionally Advanced Modes 4, 5, 6 and 7
. The user provides
signals to the PCL from an NTA decoder indicating the location and
type of register addressed. SS
responses are generated for indicated
bad addresses, non-implemented MS codes and parity errors. The user
may disable automatic SS code generation and/or provide an external SS
code. The user may also indicate a busy condition (for SS=1) or bad
data (for SS=7). Simple control signals for
CSR#0 and user registers are provided.
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Up: 2 DESCRIPTION OF PCL
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