SYNOPSIS
loadrt weighted_sum wsum_sizes=size[,size,…]
Creates weighted sum groups each with the given number of input bits (size).
DESCRIPTION
The weighted_sum converts a group of bits to an integer. The conversion is the sum of the weights of the bits that are on plus any offset. The weight of the m-th bit is 2\^m. This is similar to a binary coded decimal but with more options. The hold bit stops processing the input changes so the sum will not change.
The default value for each weight is 2\^m where m is the bit number. This results in a binary to unsigned conversion.
There is a limit of 8 weighted summers and each may have up to 16 input bits.
FUNCTIONS
- process_wsums (requires a floating point thread)
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Read all input values and update all output values.
PINS
- wsum.N.bit.M.in bool in
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The mth input of weighted summer n.
- wsum.N.hold bool in
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When TRUE, the sum output does not change. When FALSE, the sum output tracks the bit inputs according to the weights and offset.
- wsum.N.sum sint out
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The output of the weighted summer.
- wsum.N.bit.M.weight sint rw
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The weight of the mth input of weighted summer n. The default value is 2m.
- wsum.N.offset sint rw
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The offset is added to the weights corresponding to all TRUE inputs to give the final sum.