A programmable logic device integrated circuit incorporating a memory block. The memory block (250) is a general-purpose memory configurable as a random access memory (RAM) or a first-in first-out (FIFO) memory. In one embodiment, the organization of memory block (250) may have variable word size and...http://www.google.com.hk/patents/US5572148?utm_source=gb-gplus-share專利 US5572148 - Programmable logic array integrated circuit with general-purpose memory configurable as a random access or FIFO memory
