jdb
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 1785
Joined: Thu Jul 11, 2013 2:37 pm

Re: CM and LAN9514

Tue Apr 14, 2015 6:44 pm

In theory, you are meant to hold the 9514 in reset before applying clocks to the clock input (or wait for the oscillator to start up). The reset can be released after 4 clock cycles which ensures that the signal has propagated and been registered across the entire chip.

In practice, you can apply the reset at any time including after the clock has already started to reset the device to a known state.
Rockets are loud.
https://astro-pi.org

amk
Posts: 19
Joined: Fri Feb 06, 2015 12:09 pm
Location: Netherlands

Re: CM and LAN9514

Tue Apr 14, 2015 9:30 pm

In that case I will do a measurement to assure the correct timing requirements are met.
I'm thankfull for the usefull comments and contributions, helps to get stuff working :D

nardev
Posts: 7
Joined: Wed Dec 24, 2014 12:29 pm

Re: CM and LAN9514

Tue Nov 15, 2016 4:34 am

I have been googling around looking for CM LAN solution.

I'm wondering, why RPI didn't make opensource Eagle/KiCAD or what ever format, schematics for implementing:

LAN interface
POE option
Multiple USB port
Audio port solution
HDMI option
Additional analog/digital pins out

If such thing exists, please tell me.


I deeply believe that would help many people a lot to use CM

ARQuattr
Posts: 4
Joined: Wed Aug 27, 2014 4:09 am

Re: CM and LAN9514

Sat Dec 23, 2017 3:42 pm

Hi Igor, we are looking at doing something similar as you did (adding the original LAN9514 device to a CM3), Would you be willing to share what you schematic ended up looking like?

Thanks
Angelo

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