PCB routing: Using unconnected/floating pins Topic is solved
-
- XCore Expert
- Posts: 579
- Joined: Thu Nov 26, 2015 11:47 pm
If they are connected to ground the FLASH will not be readable. These pins are directly connected to a FLASH chip inside the IC package.
View Solution
-
- XCore Addict
- Posts: 144
- Joined: Wed Jun 29, 2016 8:59 am
Oh, I haven't expected that. Does that mean that the firmware can be probed via that pins at boot time?
-
- XCore Expert
- Posts: 579
- Joined: Thu Nov 26, 2015 11:47 pm
The FLASH is directly accessible on those pins when the MCU is held in reset. If you need code security you'll have to use the AES bootloader or something.
-
- XCore Addict
- Posts: 144
- Joined: Wed Jun 29, 2016 8:59 am
Thanks for the information. Have a nice day!
-
- XCore Addict
- Posts: 144
- Joined: Wed Jun 29, 2016 8:59 am
For those who are interested in, the AES bootloader is described here:
https://www.xmos.ai/file/safeguard-ip-a ... thenticity
https://www.xmos.ai/file/safeguard-ip-a ... thenticity