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alperenpalp's avatar
alperenpalp
Icon for New Contributor rankNew Contributor
5 years ago

Need Help with FIR II TDM.

Hello, I've been trying to get FIR filter working for quite a while, but I've been runnig into problems. I am basically trying to implement 51 tap low-pass filter. I am also trying to save hardwa...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
5 years ago

Hi,


As I understand it, you have some inquiries related to the FIR serializer and deserializer for the TDM. Allow me to try explaining. Take an example of TDM = 2 + clock rate = 30MHz. Assuming there are two input streams with sample rate = 15MSPS, the serializer will convert the take 1 sample from each input stream in parallel and then serialize into one stream at 30MSPS. After the FIR, the deserializer will separate the streams.


Please let me know if there is any concern. Thank you.


  • alperenpalp's avatar
    alperenpalp
    Icon for New Contributor rankNew Contributor
    5 years ago

    I know we had this discussion before, but I am still no convinced about this issue.

    I can clearly see that the IP is expecting only one channel as this is obvious from Info Message in platform designer (see attached pic, Soru). I also set the max num of channels to 1 in filter specifications settings.

    I would really like you to review your suggestion about that. The IP clearly does not expect more than on inpur stream. There is clearly a setting for that in the filter specification tab named "max number of channels" , it is set to 1 not 2 or 3, and it's also indicated in the info message that the IP is expecting only one channel, not more.

    Can you please review your response or confirm with someone else?

    Thank you for your patience.