Author Topic: TE0720 power debug after incorrectly applying voltage.  (Read 331 times)

eschlomann

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TE0720 power debug after incorrectly applying voltage.
« on: November 02, 2022, 12:45:20 AM »
I have a TE0720 XC7Z020 chip connected to to the TE0703-06 Carrier.

In my system I plugged in a cable incorrectly and blew U3 on the carrier, verified with a thermal camera  :(. Hoping to salvage, I took the TE0720 off and plugged it into a new carrier. Now instead of getting by the flashing red on the TE0720 it is a solid red, and instead of D3 and D4 on the TE0703 being solid, all of D1, D2, D3, and D4 are blinking slowly. I am not able to connect to the device though JTAG. When I swap this out with a different chip (TE0720-04-31C33MA) on the same carrier behavior goes back to normal.

Wondering what this indicates, and hoping to salvage. I don't have any spares of my part.

Would appreciate any help or insights.

JH

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Re: TE0720 power debug after incorrectly applying voltage.
« Reply #1 on: November 02, 2022, 06:47:12 AM »
Hi,
CPLD Firmware documentation:
https://wiki.trenz-electronic.de/display/PD/TE0720+CPLD#TE0720CPLD-On-boardLEDs

But when you say all 4 leds are blinking...I would say module is damaged, looks like it restarts very time.

Green LED D4 is Done LED (Indicates PL Part is Programmed or not):
https://wiki.trenz-electronic.de/display/PD/TE0720+TRM#TE0720TRM-MainComponents

When you change boot mode to SD an power on without SD, it should be stay on. Is it on in this case or still blinking.
In any case I think something is damaged on the module.
br
John