METHOD AND APPARATUS FOR SUBTRACTING UNITS Russian patent published in 2015 - IPC G06F7/00 

FIELD: physics.

SUBSTANCE: each decimal digit of the device comprises four binary bits, each comprising one RS flip-flop, three AND logic elements, two OR logic elements, three NOT logic elements, each decimal digit further includes three AND logic elements, four data inputs, a first unit subtraction pulse input, an output for borrowing units from higher tetrads. The first decimal digit further includes two AND elements and one NOT element.

EFFECT: shorter time for generating a subtraction pulse and a borrow pulse when designing a circuit for determining zero settings of flip-flops of all tetrads.

2 cl, 1 dwg