FX2LP, how to answer with a NYET?

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brant123
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I met a following error on FX2LP-cy7c68013a. The project is designed as USB2.0 HS mode.

When Host sent NYET PID,  USB PHY has no any answer, sound card is closed.

However, FX2LP have no any interrupts with NYET, so how to deal with NYET?

截图.png

The following photo is other UAC2.0 sound card. It answered ACK after NYET, so Host success to open sound card.

截图1.png

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1 Solution
MallikaK_22
Moderator
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50 likes received 750 replies posted 250 solutions authored

Hi,

As per USB spec, the NYET handshake packet is sent by the device when the endpoint cannot accept more data.

>> Please check the following KBA.

>> https://www.usbmadesimple.co.uk/ums_7.htm

Regards,

Mallika

 

 

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4 Replies
MallikaK_22
Moderator
Moderator
Moderator
50 likes received 750 replies posted 250 solutions authored

Hi,

Could you please provide details of your system? I also need to look into the source code for analyzing the issue.

Please share the source if not confidential.

Regards,

Mallika

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Thanks for your reply!

Simply speaking, based on FX2LP, how to check out NYET which sent from Host?

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MallikaK_22
Moderator
Moderator
Moderator
50 likes received 750 replies posted 250 solutions authored

Hi,

As per USB spec, the NYET handshake packet is sent by the device when the endpoint cannot accept more data.

>> Please check the following KBA.

>> https://www.usbmadesimple.co.uk/ums_7.htm

Regards,

Mallika

 

 

brant123
Level 1
Level 1
First like given First reply posted First question asked

Thanks, Mallika.

My question is already solved. The root reason is that UAC device have not responded  for

AudioControl Requests, such as Sampling Frequency Control  and Clock Validity Control.

Thank you again for your time.

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