MUXCY_L

2-to-1 Multiplexer for Carry Logic with Local Output

MUXCY_L is used to implement a 1-bit high-speed carry propagate function. One such function can be implemented per logic cell (LC), for a total of 4-bits per configurable logic block (CLB). The direct input (DI) of an LC is connected to the DI input of the MUXCY_L. The carry in (CI) input of an LC is connected to the CI input of the MUXCY_L. The select input (S) of the MUX is driven by the output of the lookup table (LUT) and configured as an XOR function. The carry out (LO) of the MUXCY_L reflects the state of the selected input and implements the carry out function of each LC. When Low, S selects DI; when High, S selects CI.

The LO output can only connect to other inputs within the same CLB slice.

See also “MUXCY” and “MUXCY_D.”