In an SDRAM block, one of these devices takes as input the refresh counter and the row address latch.  
In an SDRAM block, one of these devices takes as input the refresh counter and the row address latch.  One common way to implement a 8 bit barrel shifter is to use five stages of these devices. The 74157 is one of  these devices. One can implement A XOR B using this device by using B, not B as the inputs and A as a special  type of line. A minimal one of these can be created from two tristate buffers and a not gate, which corresponds to the  equation Y equals D sub 0 S or D sub one not S. They act as the opposite of a n to 2^n decoder. These are depicted  as trapezoids on digital circuit diagrams. They take in a set of input lines along with control or select lines. For 10  points, name these digital logic devices that are used to choose from a set of inputs, thus combining multiple inputs  into a single output.
In an SDRAM block, one of these devices takes as input the refresh counter and the row address latch.  
multiplexer [or mux; prompt on encoder; prompt on selector]