Digital Arithmetic

502 c ~.~ ~ P:r ~!il ~,~ ~i~ Digit-Serial Arithmetic

9~

is used to add a carry-in in cycle n. This assures that one product bit is produced

per cycle.

Since the least-significant bit of the product is produced in the first cycle

of Phase 2, the initial delay is n for the case of nonconstant operands (cycles of

Phase 1) and 0 if one of the operands is constant. On the other hand, for fractional

operands and n-bit result (most-significant n bits), the LS bits are suppressed and

only the MS half is delivered. This increases the initial delay by n. To obtain a

rounded MS half of the product, a 1 is inserted in the ...