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7th March 2017, 11:17 #1
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how to call decimal values in verilog
hy
i am working in a image processing based project using FPGA. i want to call my features into addition block which are decimals in the range of 0.1 to 0.9. Can anyone tell me some techniques to convert these numbers into fixed point binary?

7th March 2017, 11:17

7th March 2017, 11:28 #2
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Re: how to call decimal values in verilog
Hi,
simply use "1...9" as integers.
And imagine as there was a "0." before it.
Or use them as integers and divide them by 10...if you really need this.
****
Maybe you need to give a bit more information, why you especially need to know that it is a value between 0 and 1.
Klaus

7th March 2017, 11:28

8th March 2017, 04:28 #3
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Re: how to call decimal values in verilog
hi,
sometimes i will use this for conversion
http://www.exploringbinary.com/binaryconverter/
then what is the fixed integer & fractional length ?
regards
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8th March 2017, 04:28

8th March 2017, 07:48 #4
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Re: how to call decimal values in verilog
can anyone explain about the roundoff to the nearest power of 2 concept? can i use this for converting my decimals into rounded integer and then into binary

8th March 2017, 18:12 #5
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Re: how to call decimal values in verilog
Nearest power of two is finding the 2^N that is nearest to your number.
e.g.
Code:2 => 2^1 (2) 5 => 2^2 (4), or 2^3 (8, for round up) 13 => 2^4 (16)
BTW in hardware all decimal numbers are stored as binary values, there are no 10 state FFs. So if you look at the following code:
Code:wire [3:0] a; assign a = 10; // 10 in binary is 1010 // a[0] = 1'b0 // a[1] = 1'b1 // a[2] = 1'b0 // a[3] = 1'b1
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8th March 2017, 18:12

9th March 2017, 04:50 #6
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Re: how to call decimal values in verilog
can you tell me how to choose an effective scaling factor? whether it should be only *10 s or any other number?

9th March 2017, 17:19 #7
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Re: how to call decimal values in verilog
You scale based on the number of bit of precision you require.
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9th March 2017, 19:08 #8
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Re: how to call decimal values in verilog
Fixed point arithmetics is absoultely the same as integer arithmetics, in fact it IS integer arithmetics. It's up to you where to put decimal point.
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