68172

The signetics 68172 VMEbus controller (BUSCON) is an interface device for the VMEbus.It can be used in three different configurations:master-only,slave-only,and master/slave.The 68172 can be used with a processor-type interface.In all configurations,it handles the VMEbus signaling protocol in compliance with revisions B and C of the VMEbus specification.

All of these applications are handled by the 68172,with unused pins tied to stated logic levels in some of the applications.

The 68172 has 6 features.The first one is master,slave,or master/slave (dual ported) applications.The second one is helps assure VMEbus compatibility.The third one is allows for address decoding time.The fourth one is processor or DMA controller interface for master/requester.The fifth one is master/requester logic allows release on request (ROR) or release when done (RWD) operation,early or intercycle release.The sixth one is supports and exploits address lookahead.

The 68172 has some absolute maximum ratings.When symbol is VCC,the parameter is supply voltage range,the rating is -0.5 to +7.0,the unit is V.When symbol is VI,the parameter is input voltage range,the rating is -0.5 to +5.5,the unit is V.When symbol is Tstg,the parameter is storage temperature range,the rating is -65 to +150,the unit is .