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Message: [QUOTE="rickman, post: 4146613"] I believe the original version is not only ugly (the woes of VHDL type conversions), but it is wrong. Shouldn't part of this be acc(acc'length-1 downto acc'length-1) ? I normally use name'high in this context. But considering 'high vs. 'left, I wouldn't know where the trade-offs are. I guess 'high may not be correct if numbered 0..N which is possible. 'left would not work if the msb is not left, but that wouldn't be compatible with unsigned would it? Rick [/QUOTE]