8-bit shift register with 2:1 mux-in, latched B inputs, and serial out 8-bit shift register with 2:1 mux-in, latched “B” inputs, and serial out 8-bit shift register with 2:1 mux-in latched B inputs and serial out 8-bit shift register with 2:1 mux-in, latched Binputs, and serial out