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sigmoid function for neuron implementation...

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rakesh_vnit

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hey everyone...
i am doin a mini project of fpga implementation of a neuron( neural networks).

here is the design for it...it contains an 8 bit multiplier. the output in accumulated with products of the next inputs multiplication outputs. now that i am multiplying 8 x 8 i am gettin 16bit output. to this i am addin a 20 bit offset. Now, here is the problem. the output from here should be converted back into an 8 bit number so that it can be the input for the next neuron. so, to make this 20 bit to 8 bit the sigmiod function is tobe used. the function is as shown in the picture below....

48_1190711058.jpg


so can anybody help me with implementation of this functions?
plz post as soon as u can...its a bit urgent...thank u..

rakesh
 

rakesh_vnit

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i was able to finish it wid out the help from here..hehehe.
anyways, for those who again want to do the same here is the help...

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