NHI-15991RT Datasheet, National Hybrid

. . . . GENERAL FEATURES . . REMOTE TERMINAL HIGHLIGHTS . BLOCK DIAGRAM . . . PROTOCOL CHIP DESCRIPTION . HOST BUS INTERFACE UNIT . . I/O BUS INTERFACE UNIT . . INTERRUPT.

. HOST BUS INTERFACE UNIT . . I/O BUS INTERFACE UNIT . . INTERRUPT CONTROL UNIT . . ICU REGISTERS . . . INTERRUPT DEFINITION TABLE . ICU FIFO . . . . DUAL REDUNDANT FRONT END . MANCHESTER DECODER . . MANCHESTER ENCODER . . GAP COUNTER . . . RT - RT N.