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MA28155 Datasheet(PDF) 10 Page - Dynex Semiconductor |
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MA28155 Datasheet(HTML) 10 Page - Dynex Semiconductor |
10 / 20 page MA28155 10/20 OPERATING MODE 2 (Strobed Bidirectional Bus I/0) This functional configuration provides a means for communicating with a peripheral device or structure on a single 8-bit bus for both transmitting and receiving data (bidirectional bus l/O) . Handshaking signals are provided to maintain proper bus flow discipline in a similar manner to Mode 1, Interrupt generation and enable/disable functions are also available. s Used in group A only. s One 8-bit bidirectional bus port (port A) and 5-bit control port (port C). s Both inputs and outputs are latched, s The 5-bit control port (port C) is used for control and status of the 8-bit bidirectional bus port (port A). NOTE: Any sequence where RD/WN = 0 coincident with DSN low occurs before ACKN and STBN occurs before RD/WN = 1 coincident with DSN is permissable (INTR = IBF MASK STBN (RD/WN = 1. DSN = 0) + OBFN MASK ACKN (RD/WN = 0. DSN = 0)) Figure 15: Bidirectional Timing Diagram DSN RD/WN OBFN ACKN STBN |
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