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Adventurer
Adventurer
8,996 Views
Registered: ‎05-12-2012

DQS_BIAS report durning implementation

Hi all. There is strange multiple warnings I've got when implement my design:

 

WARNING:Pack:2949 - The I/O component bDAC_DCO_N uses an DQS_BIAS attribute with
I/O standard LVDS. The DQS_BIAS attribute will be ignored since the selected
I/O standard does not support DQS_BIAS usage.

 

I use simple ibufds primitive in my hdl code. Really I courious why this message appear.

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Adventurer
Adventurer
8,993 Views
Registered: ‎05-12-2012

Forgot to say: ISE ver. 14.5; IC: Zynq 045. And there is no any external memory in my design.
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Scholar
Scholar
8,979 Views
Registered: ‎06-14-2012

The DQS_BIAS is limited to specific DIFF_SSTL standards.
it seems that the property is attached to IBUFDS and the value is false which seems the default. Ideally if its not set, it shouldn't check with the compatible IOStandards.
CR720197 was filed for this issue. You can ignore this safely.

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Mentor
Mentor
2,688 Views
Registered: ‎06-09-2011

Hi,

I know that a long time has elapsed from the last message. However, I am receiving this warning in a design that is based on a Kintex-7 - ISE14.7 - and my IOSTANDARD is LVDS not a DIFF_SSTL?!. So, Why am I receiving such message for these IOs?

What is DQS_BIAS ? Where can I find comprehensive information regarding this attribute?

 

Thanks in advance,

Hossein

Thanks,
Hossein
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Explorer
Explorer
2,208 Views
Registered: ‎06-08-2017

WARNING:Pack:2949 - The I/O component DCO_n uses an DQS_BIAS attribute with I/O
   standard LVDS_25. The DQS_BIAS attribute will be ignored since the selected
   I/O standard does not support DQS_BIAS usage.
WARNING:Pack:2949 - The I/O component DCO_p uses an DQS_BIAS attribute with I/O
   standard LVDS_25. The DQS_BIAS attribute will be ignored since the selected
   I/O standard does not support DQS_BIAS usage.

I also receive a similar message during Map for LVDS_25 input. Is this an ISE bug?

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