Multiply add Block and How to cope with the problem of the lack of ressources

Hi,

Well, hand-crafting FPGA is by far best for resource. Tools like DSP builder are not that mature yet...but may accelerate the design in some cases or may make it worse producing a pile of garbage.

TDM is time sharing i.e. if I can run at say twice data speed then I can have one multiplier do the job in first cycle for one data then same multiplier do the job for next data(this is minimum TDM factor , =2 and can be higher).

Datawidth if say is 19 bits then it will waste a lot since most altera multipliers are of 9bit graininess.

There are some other points:

9) use power of 2 shift to replace multipliers

10) look for zero multiplicand cases. These cases you know the result??

Kaz