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ISIM sfixed values looks wrong.

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nesta

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Hi VhdlExperts,

I am using Xilinx webpack 12.4 ISIM and see some strange results for sfixed values especially for negative numbers.

for eg:

signal Ain : sfixed(7 downto -3);

Ain <= to_sfixed(-2.5),Ain);


gives me 11111101100 (ie 11111101.100 ) instead of 11111110.100


-----

Ain <= to_sfixed(-3.5),Ain);

gives me 11111100100 (ie 11111100.100 ) instead of 11111101.100
---

Am i doing something wrong, or my intrepretation is wrong.


Also would like to know if the operators & functions like ( + addition, * mul, abs) are synthesizable as i am using simulator currently.



Please help.

Thanks,
Sunish
 

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