Calculating unit and method for subtracting

Details Calculating unit and method for subtracting Calculating unit and method for subtracting

2005-11-29

2005-11-29

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S712000

Reexamination Certificate

active

06970899

ABSTRACT:
Calculating unit having adder blocks, each having single adders, a carry input, a carry output, and a carry pass output, wherein a signal at the carry pass output is indicative of a carry passing through the adder block. Depending on the carry pass output signal, a clock generator for feeding the adder blocks with operands to be processed is decelerated. A determining unit determines in which of the adder blocks a least significant bit of an operand to be subtracted is disposed. A deactivating unit deactivates a carry pass output of adder block(s) provided for lower order digits with respect to the adder block in which the least significant bit is disposed, and a feeding unit feeds a carry into the carry input of this adder block in which the least significant bit is disposed.

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