Thanks for the link. For all the folks complaining about the lack of protection internal to the Prop, this shows how straightforward it is to gain access to anything encapsulated and how easy it is to read out an EEPROM or fusible ROM. Once you can unroof a chip, you can probe it.
Fly Logic Website said...
Using our proprietary procedures, all parts remain 100% functional with no degradation after exposing the substrate.
Wow. That's pretty amazing. Interestingly for me is that the company is in Vista, California, just a couple of minutes from me. Anyway, thanks for the link.
"probing it" would simply mean to literally take a meter with suitable probes and checking if the fuse was still in-tact or if it had been blown. ... Or simply looking at the fuse with a microscope.
All,
The accessibility also depends on the metallization used over the fuse. With the link provided at the beginning of this thread, there is no wire routing over the fuse, so of course it's obvious where the fuse·is, but it is not against the rules to route directly over a poly-fuse. With a poly-fuse, and the process that we are using you could have 5 layers of metal (shield) over the top of the actual fuse element. ...So removing the "lid" won't necessarily provide the answer you need to determine if the fuse is blown or not.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Beau Schwabe
IC Layout Engineer
Parallax, Inc.
Luis Digital
Posts: 371
Comments
Wow. That's pretty amazing. Interestingly for me is that the company is in Vista, California, just a couple of minutes from me. Anyway, thanks for the link.
"probing it" would simply mean to literally take a meter with suitable probes and checking if the fuse was still in-tact or if it had been blown. ... Or simply looking at the fuse with a microscope.
All,
The accessibility also depends on the metallization used over the fuse. With the link provided at the beginning of this thread, there is no wire routing over the fuse, so of course it's obvious where the fuse·is, but it is not against the rules to route directly over a poly-fuse. With a poly-fuse, and the process that we are using you could have 5 layers of metal (shield) over the top of the actual fuse element. ...So removing the "lid" won't necessarily provide the answer you need to determine if the fuse is blown or not.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Beau Schwabe
IC Layout Engineer
Parallax, Inc.