Why does the fixed-point multiplication block from the Fixed-Point Blockset sometimes produce incorrect results?

Under certain simulation conditions, I receive incorrect results when multiplying two fixed point values. For example, when performing fixed point multiplcation on numbers that should return a negative, 64+ bit value, I sometimes receive the wrong result.

Answer 1

[MathWorks Support Team]

This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:

This problem has been fixed in the Fixed Point Blockset Version 4.1 (13SP1). If you are using a previous version, there is no known workaround.