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16th March 2008, 06:18 #1
I want phase shift in DDS output depending upon the input
I m using a DDS (Xilinx block) and i am gettin a sine wave with sample period of 0.001
i have made the phase increment option in block parameter as register and im getting two new ports 'data' and 'we'
... so now i need to know how should i get a phase increment of pi radians ...what should be the input data type to the 'data'pin of DDS?

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16th March 2008, 12:33 #2
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I want phase shift in DDS output depending upon the input
Xilinx provides at least two different DDS cores. Which one are you using?
The DATA phase input values range from 0 to almost 2*pi radians. For example, if your DATA is 16 bits wide, then values from 0 to 65536 represent 0 to 2*pi radians. You would input 32768 to get pi radians.

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16th March 2008, 15:21 #3
I want phase shift in DDS output depending upon the input
thnx very much echo ...
i have system generator 7.1 and the model version of DDS is 1.4
im making a MaryPSK transceiver with transmitter havin ROM ... so my input to DDS will be from ROM
how to calculate this value of 32768 for pi radians ?
Added after 1 hours 14 minutes:
ok ok i got the answer ... thnx echo.... i had not read it properly.... [:P]
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