These are my results ampermeter in series with LAN power pins, tested on custom board After reset, no cable connected – 42mA Power Down – 2. Alright i stepped through the Kernel code and i found it was a powersave feature. CT measuring circuit with PIC 3. How do i check whether an I2C device works? Part and Inventory Search. Post as a guest Name.

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Does this theory sound correct? I looked at the Schematic of wavshare board and the schematic of LAN IC provided by Microchip and found a many difference in the schematics of both so thought of raising the question.

And if i then plug the cable back in it does not connect again and manually typing ifup just fails to get lease from DHCP and there are no lights on the connector or hub. Similar Threads Power consumption in a cellphone to determine IC power consumption 1.

LAN – Link brekdown with some devices | Microchip

Home Questions Tags Users Unanswered. Related to source pull simulation for rectifier 0. No license, either express or implied, by estoppel or otherwise, is granted by TI. Here is what i am finding with the ethernet:. Post as a guest Name. Therefore, the Waveshare board should configure into the same mode as the LAN liux schematic.

Linux-4.1.15 : problem with LAN8720A

So do you know of any mode that the kernel would put the chip in that would cause it to stop producing the refclk? Short circuit protection in PCB design 5. TI, its suppliers and providers of content reserve lam8720a right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.


I can tell when the clock goes away, basically the kernel completely boots and my rcS script runs this command: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

So my assumption here is that since lan8720s LANA is in energy detect power-down it will not be sending anything out and i am guessing after a few seconds of no activity on a port the switch Netgear FSv2 stops sending anything down that port since it “learns” there is lan8720w there.


Do you have another question? I am using 3. Dynamic IR drop analysis 7. Mentions Tags More Cancel. I looked through the PHY datasheet today and I suspect that there may be a hardware issue.

Also here is the diff of what i lan88720a to correct the clocks: If you do not apply the configuration pulling resistors on your board, then the internal pull-ups on the LAN apply and the Waveshare board will default as follows: This is to ensure that the pin reaches the required voltage level lihux to latching, as the internal pull-up resistor is very weak high resistance. If you have further questions related to this thread, you may click “Ask a related question” below.


net: fec: hard phy reset on open – Patchwork

Heat sinks, Part 2: I disabled the Energy Detect Power-Down mode and everything is working great now. This thread has been locked. Equating complex number interms of the other 5. DAC input digital signals, how to generate?

All postings and use of linus content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. For this I had two choices.

Re: [PATCH v2] net: phy: workaround for buggy cable detection by LAN8700 after cable plugging

Nothing, no light no connection. I found another thread that discusses an issue that may be similar to yours: Part and Inventory Search. In the future if we progress to battery powered systems i will make modifications to do the polling.