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The CY74FCT652T consists of bus transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal storage registers. GAB and GBA\ inputs control the transceiver functions. Select-control (SAB and SBA) inputs select either real-time or stored-data transfer. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. A low input level selects real-time data, and a high input level selects stored data.
Data on the A or B data bus, or both, can be stored in the internal D-type flip-flops by low-to-high transitions of the appropriate clock (CPAB or CPBA) inputs, regardless of the select or enable levels of the control pins.
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