section 7 - Index of

SIGNED MULTIPLICATION N x N .2N - 1 BITSINTEGERFRACTIONALIs Is Is IsSIGNED MULTIPLIERergls MSP : LSP.. 2N - 1 PRODUCT ---.SIGN EXTENSION_----- 2N BITS----_SIGNED MULTIPLIER·1 ~ls-.--M-SP2N-1 PRODUCT LSP ~I ~ZERO FILL =--1_----- 2N BITS----_Figure 3-9 Integer/Fractional Multiplication Comparisonbiased in that direction. Convergent rounding solves the problem by rounding down if thenumber is odd (LSB=O) and rounding up if the number is even (LSB=1). Figure 3-10shows the four cases for rounding a number in the A1 (or B1) register. If scaling is set inthe status register, the resulting number will be rounded as it is put on the data bus. However,the contents of the register are not scaled.