DSP: chainout = ( (ay+az)ax) + ( (by+bz)bx) + chainin

Arria 10 DSP: I am trying to realize
chainout = ( (ay+az)*ax) + ( (by+bz)*bx) + chainin
According to the documentation diagrams and tables, systolic form should support this. But when I set az/bz to 18 in the IP generator it rejects with the reason of 'az' range should be 0 in this form.
Is this a IP generator SW problem, or DSP does not support this setting?
Can I instantiate twentynm_mac_component directly without using the IP generator? Or does Altera have a DSP primitive that I can use to instantiate?

chainout = ( (ay+az)) + ( (by+bz)) + chainin

also works for me. Basically I am trying to pack 5 adders in to one DSP.

CheepinC_altera
4 years ago
Hi,

Sorry for the delay. I might have overlooked this. Thanks for contacting me. For your information, I have looked into the DSP block architecture in documentation and understand that there should be no issue to implement your target operation.

As I tested with the A10 Native Fixed Point DSP IP, I am able to replicate similar error with your configuration. After further debugging, I found that the right option for the ay' and by' operand source should be "preadder" for your target operation. After I switch to "preadder", the error goes away and the IP Block Symbol also looks correct. You can try on your side to see if it works.

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

5 Replies

CheepinC_altera
Regular Contributor
4 years ago
Hi,

As I understand it, you have some inquiries related to the A10 DSP IP. To ensure we are on the same page, would you mind to share with me further on the following:

1. What is the specific DSP IP that you are using which trigger error?

2. What is your Quartus version?

3. Mind share with me some screenshot of the IP GUI and the error message that you are seeing?

I would like to perform issue replication on my side to facilitate further debugging.

Please let me know if there is any concern. Thank you.
- FPGAOLOG
  Occasional Contributor
  4 years ago
  Altera Std 20.1.1
  
  Native Fixed Point DSP Intel Arria 10 FPGA IP
  - FPGAOLOG
    Occasional Contributor
    4 years ago
    Any update on this issue?
CheepinC_altera
Regular Contributor
4 years ago
Hi,

Sorry for the delay. I might have overlooked this. Thanks for contacting me. For your information, I have looked into the DSP block architecture in documentation and understand that there should be no issue to implement your target operation.

As I tested with the A10 Native Fixed Point DSP IP, I am able to replicate similar error with your configuration. After further debugging, I found that the right option for the ay' and by' operand source should be "preadder" for your target operation. After I switch to "preadder", the error goes away and the IP Block Symbol also looks correct. You can try on your side to see if it works.

Please let me know if there is any concern. Thank you.
CheepinC_altera
Regular Contributor
4 years ago
Hi,
I believe the initial inquiry has been addressed. This thread will be transitioned to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.