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Bias block not working properly with fixed point data type

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ALi Falahati
ALi Falahati 2023-2-16
评论： ALi Falahati 2023-2-20
Even though in the documentation of the bias block it supports fixed point types, it doesn't behave correctly when given a fixed point input.
I gave a u-1 bias block an input with data type fixdt(0, 12, 0) with value of 2220 and the output was 2220 instead of 2219.

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Fangjun Jiang
Fangjun Jiang 2023-2-20
fixdt(0, 12, 0) means "unsigned". The Bias block does the "Y=U+Bias" operation. The value of -1 can't be represented. If you try "Y=U+1", the result is correct.
If you choose fixdt(1,12,0), which means "signed", then "Y=U+1" or "Y=U-1" both show correct result.

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