The CY7C343 contains 64 highly flexible macrocells and 128 expander product terms. These resources are divided into four Logic Array Blocks (LABs) connected through the Programmable Inter-connect Array (PIA). There are eight input pins, one that doubles as a clock pin when needed. The CY7C343 also has 28 I/O pins, each connected to a macrocell (six for LABs A and C, and eight for LABs B and D). The remaining 36 macrocells are used for embedded logic.