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

USB superspeed peripherals

HuEl_264296
Level 5
25 sign-ins First solution authored 100 replies posted
Level 5

Hi,

I am using a CX3 to bridge a MIPI camera to USB.

The CX3 is booting from SPI FLASH.  There is no external I2C device connected.

In that case, do I still need the I2C pull-up resistors connected, or should it work without them?

 

The reason I ask is that my system works fine when I have the I2C resistors soldered in place (I see a live stream from the camera), but if I remove them, then the CX3 enumerates and appears in Device Manager, but I no longer see any images from the camera.

 

Thanks

Hugo

 

0 Likes
1 Solution
JayakrishnaT_76
Moderator
Moderator First question asked 1000 replies posted 750 replies posted
Moderator

Hello Hugo,

It is necessary to have pull up resistors on I2C lines of CX3. This is because the MIPI CSI-2 block of CX3 is configured over I2C interface as mentioned in section 1.4 of CX3 TRM. The CX3 TRM comes along with FX3 SDK and can be found in the following location:
C:\Program Files (x86)\Cypress\EZ-USB FX3 SDK\1.3\doc\firmware

Best Regards,
Jayakrishna

View solution in original post

0 Likes
3 Replies