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USB Superspeed Peripherals

Feitong
New Contributor

Here is the thing that I 've bought an CYUSB3KIT-003,and I used it in slave fifo mode.  I used FLAGA and set it to gpio_21. 2021-04-15 (2).pngAs I understand it, gpio_21 is connected to the CTL_4 pin of the board so it should be logic 0 after the board is booted, however , its voltage was about 0.9V.

 How is it happen? 

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1 Solution
AliAsgar
Moderator
Moderator

Hello,

As FX3 is used in slave mode, PCLK is expected. Check CTL4 with PCLK in place. Let us know if any further queries.

Best Regards,
AliAsgar

 

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4 Replies
AliAsgar
Moderator
Moderator

Hello,

Could you check the stability of your PCLK line?

We observed the CTL4 line on our CYUSB explorer kit and got the output as expected. We have attached the pin trace for your reference.

Best Regards,
AliAsgar

 

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Feitong
New Contributor

Hi,

When I was measuring the vlotage of the CTL4, the PCLK is not connected. So it does matter, right? The CTL4 will get weird if there is no PCLK input?

Thanks so much.

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AliAsgar
Moderator
Moderator

Hello,

As FX3 is used in slave mode, PCLK is expected. Check CTL4 with PCLK in place. Let us know if any further queries.

Best Regards,
AliAsgar

 

View solution in original post

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Feitong
New Contributor

Hi AliAsgar,

The FX3 works fine after I attached PCLK to it!

Thanks so much!

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