Carry-Propagate Address Incrementer With Self-Timed Interlocking Enable Circuits
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
This invention provides a unique and practical way of implementing a useful logic function onto a random-access (RAM) chip, which is very desirable for bit buffered displays and other applications. Certain types of functional memory require an address-incrementing function to be included on the memory chip. This function is merely the addition of 1 to the given address whenever the separate "increment" pin is valid, and an addition of 0 when the increment pin is not valid. Although this incrementing function can be obtained in various ways on a memory chip, the most straightforward and economical method is to use a 1-bit carry propagate "adder" on the desired address pins, prior to presenting the signals to the decoder. In principle, the inclusion of a 1-bit adder should be a trivial logic function to any logic circuit.