AT&T 3B2/300 Technical Reference Manual page 271

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - - -
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PR[l]W[O]
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V AUD ADDRESS
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PPA23-00[l]
SYSTEM
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PCS[O]
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PSIZE16[0]
PERIPHERAL
VALID UNIT
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PPAS[O]
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SYSTEM
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PERIPHERAL
PDIS-00[1]
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VALID DATA
UNIT
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PDSl-0[0]
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SYSTEM
PDTACK[O]
PERIPHERAL
PFLT[O]
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Note: Data is valid at system board for at least 20 nanoseconds before PDT ACK[O].
Figure 3-6: System Board Peripheral Controller Read Operation
3-18 TECHNICAL REFERENCE MANUAL