IDT72831 syncfifo equivalent, dual cmos syncfifo.
* The 72801 is equivalent to two 72201 256 x 9 FIFOs
* The 72811 is equivalent to two 72211 512 x 9 FIFOs
* The 72821 is equivalent to two 72221 1024 x 9 FIF.
* 15 ns read/write cycle time FOR THE 72801/72811
* 20 ns read/write cycle time FOR THE 72821/72831/72841
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