Study and Implementation of a Parallel Overflow Checking and Saturating Low Power MAC Units
Gui Wan-ru · Mini-micro Systems · 2005
This paper presents a new structure of parallel overflow checking and saturating low power MAC Unit. Because of the parallel overflow detection and calculation, this new MAC Unit needs not perform extra particular overflow detection instruction, so the power of the instruction fetching and decoding is saved. In the case of overflow, it stops the last stage's carry-propagated operation and keeps them in their own states although this addition has not been completely finished. Then, it saturates the results to the most positive number and prevents this stage from acting in order to save power. Finally, this MAC Unit is fabricated using 0. 35uuuuuuuuum CMOS process. The experiments have proved that compared with conventional MAC Unit, it not only accelerate calculation, but also can save power from 10 to 20 percents.