Multi-queue first-in first-out (FIFO) memory devices include multi-port register files that provide write count and read count flow-through when the write and read queues are equivalent. According to some of these embodiments, a multi-queue FIFO memory device includes a write flag counter register file...http://www.google.com.tw/patents/US7447812?utm_source=gb-gplus-share專利 US7447812 - Multi-queue FIFO memory devices that support flow-through of write and read counter updates using multi-port flag counter register files
