4 ms·
The mystery of the Zombie RAM (2014)
- isp 11y ago"LED as power generator" on Electrical Engineering Stack Exchange: https://electronics.stackexchange.com/q/217765 https://electronics.stackexchange.com/q/217765
- mchahn 11y agoI was developing a test rig for a cmos rom back in the 70's (yes, HP made cmos roms). I was testing my test rig and as usual I tested removing the power pin. The test kept passing so I thought my rig was screwed up. It turns out that the input signals were powering up the chip through the same protection diodes mentioned in the article. Edit: One would think that if the input test vector included an all-zeros case the chip would fail. It turns out this didn't happen because there were two chip-enables, one true and one false.