How to express 1.164 and 0.392 in Binary?

[EDA_hg81]

1.164 and 0.392 are constants.

How can I express them in Binary for using in FPGA?

Thanks.

 

[rkodaira]

1.164 dec = 1.00101001111110111110011 bin
0.392 dec = 0.01100100010110100001110 bin

I did it with 23 binary digit after binary point and these binary values don´t give you the decimal number exactly (1.16399999708 and 0.39199999720).

 

[firefoxPL]

if you want to manipulate fixed-point values in FPGA you should check out IEEE.Fixed_Pkg from **broken link removed** it's a proposed implementation of fixed-point arithmetic for next ieee standard in VHDL, the library has some problems compiling under XST (Xilinx ISE, I don't know how 10.1 version of ISE works with this package) but works preaty nice with Precision from Mentor

 

[EDA_hg81]

Thank your reply.

this really helped me.

 

[Iouri]

if you doing color space conversion, I would strongly recomend google it for proper constants integer , if you are just looking at Xilinx app notes it is not enough

good lack