NAME

weighted_sum - convert a group of bits to an integer

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)

Read all input values and update all output values.

PINS

wsum.N.bit.M.in bit in

The m'th input of weighted summer n.

wsum.N.hold bit in

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 signed out

The output of the weighted summer

wsum.N.bit.M.weight signed rw

The weight of the m'th input of weighted summer n. The default value is 2^m.

wsum.N.offset signed rw

The offset is added to the weights corresponding to all TRUE inputs to give the final sum.

SEE ALSO

scaled_s32_sums(9), sum2(9).