GENERAL DESCRIPTION
Device logic is automatically configured according to the user’s design specification. Design is simplified by design software, allowing automatic creation of a programming file based on Boolean or state equations. The PALCE26V12 utilizes the familiar sum-of-products (AND/OR) architecture that allows users to implement complex logic functions easily and efficiently. Multiple levels of combinatorial logic can always be reduced to sum-of-products form, taking advantage of the very wide input gates available in PAL devices. The functions are programmed into the device through electrically-erasable floating-gate cells in the AND logic array and the macrocells. In the unprogrammed state, all AND product terms float HIGH. If both true and complement of any input are connected, the term will be permanently LOW. The product terms are connected to the fixed OR array with a varied distribution from 8 to 16 across the outputs (see Block Diagram). The OR sum of the products feeds the output macrocell.
Advanced Micro Devices
