Hi,

I am trying to make use of the CE clock in a custom RFNoC block on an N300.

The way I understand it is to add it to the clock definitions in the block
yaml file:

clocks:

• name: rfnoc_chdr
  freq: "[]"
• name: rfnoc_ctrl
  freq: "[]"
• name: ce
  freq: "[]"

and then just connect it in the image yaml file:

clk_domains:

• { srcblk: device, srcport: radio,    dstblk: radio0,    dstport:
  radio    }
• { srcblk: device, srcport: ce,        dstblk: polconv0,  dstport: ce
  }

Running make I get the error: "Invalid clock domain connection: device:ce
→ polconv0:ce (ce is not a clock input)"

I can't find another place to define that clock input for my block?

Kind regards, Kevin

Ah. It sneakily uses the block config which got installed in /usr/local/share/uhd and not the one I am working on.

Thanks.

From: Martin Braun martin.braun@ettus.com
Sent: Wednesday, 02 April 2025 11:13
To: Kevin Williams kevin.williams@vastech.co.za
Cc: usrp-users@lists.ettus.com
Subject: [EXTERNAL]Re: [USRP-users] connecting the ce clock to a custom rfnoc block

What you're doing is correct. Is it possible there's an old version of the YAML file that is being picked up? You can increase the log level of the image builder, it will tell you which files it's sourcing.

--M

On Wed, Apr 2, 2025 at 10:31 AM Kevin Williams <kevin.williams@vastech.co.za mailto:kevin.williams@vastech.co.za > wrote:

Hi,

I am trying to make use of the CE clock in a custom RFNoC block on an N300.

The way I understand it is to add it to the clock definitions in the block
yaml file:

clocks:

• name: rfnoc_chdr
  freq: "[]"
• name: rfnoc_ctrl
  freq: "[]"
• name: ce
  freq: "[]"

and then just connect it in the image yaml file:

clk_domains:

• { srcblk: device, srcport: radio,    dstblk: radio0,    dstport:
  radio    }
• { srcblk: device, srcport: ce,        dstblk: polconv0,  dstport: ce
  }

Running make I get the error: "Invalid clock domain connection: device:ce
→ polconv0:ce (ce is not a clock input)"

I can't find another place to define that clock input for my block?

Kind regards, Kevin

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