Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

USB low-full-high speed peripherals Forum Discussions

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

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

0 Likes
1 Solution
MallikaK_22
Moderator
Moderator 250 solutions authored 500 replies posted 250 replies posted
Moderator

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

 

 

View solution in original post

4 Replies
MallikaK_22
Moderator
Moderator 250 solutions authored 500 replies posted 250 replies posted
Moderator

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

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

Thanks for your reply!

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

0 Likes
MallikaK_22
Moderator
Moderator 250 solutions authored 500 replies posted 250 replies posted
Moderator

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
First like given First reply posted First question asked
Level 1

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.

0 Likes