Bits 15:0 of public device ID. (ECC)
The CHIPID0…3 rows contain a 64-bit random identifier for this chip, which can be read from the USB bootloader PICOBOOT interface or from the get_sys_info ROM API.
The number of random bits makes the occurrence of twins exceedingly unlikely: for example, a fleet of a hundred million devices has a 99.97% probability of no twinned IDs. This is estimated to be lower than the occurrence of process errors in the assignment of sequential random IDs, and for practical purposes CHIPID may be treated as unique.
| CHIPID0 |