+ Post New Thread
Results 1 to 8 of 8

7th March 2017, 11:17 #1
 Join Date
 Jan 2016
 Posts
 43
 Helped
 1 / 1
 Points
 462
 Level
 4
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
Awards:
 Join Date
 Apr 2014
 Posts
 10,635
 Helped
 2519 / 2519
 Points
 52,772
 Level
 56
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

8th March 2017, 04:28 #3
 Join Date
 Jul 2014
 Posts
 186
 Helped
 13 / 13
 Points
 1,499
 Level
 8
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
2 members found this post helpful.

8th March 2017, 04:28

8th March 2017, 07:48 #4
 Join Date
 Jan 2016
 Posts
 43
 Helped
 1 / 1
 Points
 462
 Level
 4
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
 Join Date
 Sep 2013
 Location
 USA
 Posts
 6,347
 Helped
 1538 / 1538
 Points
 27,784
 Level
 40
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
1 members found this post helpful.

9th March 2017, 04:50 #6
 Join Date
 Jan 2016
 Posts
 43
 Helped
 1 / 1
 Points
 462
 Level
 4
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, 04:50

9th March 2017, 17:19 #7
 Join Date
 Sep 2013
 Location
 USA
 Posts
 6,347
 Helped
 1538 / 1538
 Points
 27,784
 Level
 40
Re: how to call decimal values in verilog
You scale based on the number of bit of precision you require.
1 members found this post helpful.

9th March 2017, 19:08 #8
 Join Date
 Dec 2013
 Location
 StPetersburg, Russia
 Posts
 78
 Helped
 24 / 24
 Points
 1,080
 Level
 7
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.
1 members found this post helpful.
+ Post New Thread
Please login