Digital electronic circuit for addition and subtraction of 5211 code - has operation of tetrad circuit controlled by logic circuitry generating signals with decimal point control

摘要

The circuit receives two 4 bit numbers coded in 5211 code that are received by a pair of multistage parallel registers connected to the inputs of a processing circuit. The control signals for operation of the addition and subtraction processes are generated by a control logic unit. The logic circuit has logic gates and flip-flops connected to a pulse counter (19) and two main logic stages (17,18), the later of these (18) providing a High level (H) signal to control the floating point comma position. ADVANTAGE - Reduced circuit complexity.