General Description
These register files are organized as 4 words of 4 bits each, and separate on-chip decoding is provided for addressing the four word locations to either write-in or retrieve data. This permits writing into one location, and reading from another word location, simultaneously.
   
Features
■ For use as:
    Scratch pad memory
    Buffer storage between processors
    Bit storage in fast multiplication designs
■ Separate read/write addressing permits simultaneous
    reading and writing
■ Organized as 4 words of 4 bits
■ Expandable to 512 words of n-bits
■ 3-STATE versions of DM74LS170
■ Fast access times 20 ns typ