how to increase frequency

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truncating 3 bits(instead of explicit division):

for 8 values average you need to divide the sum by 8 i.e. 2^3 so all you have to do is discard the 3 LSBs from sum4.

using mult instead of divide(since dividers can be slower than multipliers):

to divide by 9, final sum = sum4/9 = sum4 * 57/512

i.e. multiply sum4 by 57 then discard 9 bits off final result.

The value 57 is derived from 512/9

you can and should use more bits for more accuracy:

final sum = sum4 * 3641/32768 then discard 15 bits

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hey thanx everyone ......

the multiplication funda worked for me ....... multiplying the sum by 57 and then discarding the lsb 9 bits, frequency almost increased to 3 times ...... the design is now at 80MHz.

cheers

-amit garg