Page 1 of 1

some questions about schematics for the Compute Module IO board (CMIO)

Posted: Mon Jan 13, 2020 12:25 pm
by ericxu
Hello everyone,

This is our first time to use the CM to develop our own product. Here are some questions met when we check the schematics of CMIO module:

1. What's the meaning of PP1, PP2,...PP19?
2. C21&C22, it marks as NF, do you have the exact electric capacity?
3. R15&R24&R25, it marks as NF, do you have the exact resistance value?

Please kindly help me to check.

And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference?

Thank you in advance for all your support.

Re: some questions about schematics for the Compute Module IO board (CMIO)

Posted: Mon Jan 13, 2020 1:03 pm
by PhilE
PP means Probe Point - it's a place to measure the signal with a scope or logic analyser.
NF means Not Fitted - there is no component fitted there.

Re: some questions about schematics for the Compute Module IO board (CMIO)

Posted: Mon Jan 13, 2020 4:36 pm
by Frederir
And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference?
The ethernet connection is made through a Lan9514 chip (USB Hub + Ethernet). You can find schematics of CM3 using it, google is your friend.

Good luck with your design.

Re: some questions about schematics for the Compute Module IO board (CMIO)

Posted: Tue Jan 14, 2020 8:10 am
by ericxu
PhilE wrote:
Mon Jan 13, 2020 1:03 pm
PP means Probe Point - it's a place to measure the signal with a scope or logic analyser.
NF means Not Fitted - there is no component fitted there.
Thank you very much for your help.

Re: some questions about schematics for the Compute Module IO board (CMIO)

Posted: Tue Jan 14, 2020 8:11 am
by ericxu
Frederir wrote:
Mon Jan 13, 2020 4:36 pm
And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference?
The ethernet connection is made through a Lan9514 chip (USB Hub + Ethernet). You can find schematics of CM3 using it, google is your friend.

Good luck with your design.
Thank you very much for your help.

Re: some questions about schematics for the Compute Module IO board (CMIO)

Posted: Mon Mar 09, 2020 3:31 pm
by fuwen0202
i just layout LAN9500A usb2lan IC, without test。。。。if u need,say a words