The CY29FCT520T devices are multilevel 8-bit-wide pipeline registers. The devices consist of four registers, A1, A2, B1, and B2, which are configured by the instruction inputs I0, I1 as a single 4-level pipeline or as two two-level pipelines. The contents of any register may be read at the multiplexed output at any time by using the mux-selection controls S0 and S1.