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Interesting part about QFuses. How are they actually implemented in the hardware?
by jtchang 11y ago
Interesting part about QFuses. How are they actually implemented in the hardware?
- laginimaineb 11y agoAFAIK it's unknown - there's a controller on the SoC which is responsible for reading/writing the fuses, but its firmware is in mask ROM and isn't available. Perhaps it's a real chemical reaction? Maybe it's just emulated in firmware? Your guess is as good as mine.
- sliverstorm 11y agoCould easily be an actual fuse. A array of skinny pieces of metal with a big monster current source to pop them on command.
- tyingq 11y agoGenerically, it would be referred to as "OTP NVM", or one time programmable non-volatile memory. There are apparently a few different ways to implement that. A little dry, but the only thing I could find with some comparison of approaches: http://www.kilopass.com/wp-content/uploads/2010/04/comparison_of_embedded_nvm.pdf http://www.kilopass.com/wp-content/uploads/2010/04/compariso...