CVA BlueWhale CVM012x
Contents
The CVA BlueWhale CVM012x are Cortex-M0+ based MCUs.
Internal Flash
Supported Regions
The internal flash is divided into program flash and data flash:
- Program flash storage area starting at 0x00000000 with up to 224KB
- Program flash configuration field area starting at 0x00000400 with 1KB
- Data flash storage area starting at 0x10000000 with 32KB
For now, the J-Link supports the program flash storage and data flash storage. Specific handling of the program flash configuration fields is not supported.
Option Byte Programming
The CVM012x series devices provides a program flash configuration field area (option bytes) which allow some "permanent" configuration as well as readout protection for the device. The option bytes become effective after a reset, or, if the read protection is set while a debugger is still connected through JTAG/SWD, become effective after a power-on-reset.
The option byte area consists of multiple configuration fields. After a reset, the values within these fields will be written into the corresponding registers. All complementary bytes are automatically set when writing the option bytes.
Address | Register mapping |
---|---|
0x00000400 | { backdoor keys[63:0] } |
0x00000408 | { FTFC_PFPRONT[27:0], Reserved[3:0], FTFC_DFPRONT[7:9], FTFC_EFPRONT[7:0], Reserved[15:0] } |
0x00000410 | { Reserved[3:0], FTFC_FSEC[5:4], FTFC_FSEC[7:6], Reserved[55:0] } |
0x00000418 | { FTFC_FSEC[1:0], Reserved[61:0] } |
0x00000420 | User defined Info |
Writing 0xFF to FTFC_FSEC will read-protect the CVM012x . In order to keep the device unprotected you have to write the correct key value to FTFC_FSEC.
- FTFC_FSEC = 0xF2
Connect Specifics
Up to V7.88n
- If the FTFC_FSEC SECURE bit is set, J-Link software will show a popup with the option to unsecure the device via a mass-erase.
- If any flash area is write protected via the FTFC_xFPRONT bits, J-Link software will show a popup with the option to unprotect all areas via a mass-erase.
Starting from V7.88n
- If the FTFC_FSEC SECURE bit is set, J-Link software will show a popup with the option to unsecure the device via a mass-erase.
- If any flash area is write protected via the FTFC_xFPRONT bits, J-Link software will show an information popup without any options.
Writing 0x01 to FTFC_PFPRONT will cause the Cfg Field to be protected. After a power-cycle this can only be recovered by an external mass erase via MDM-AP.
Find more information in the corresponding device reference manual.Reset
No device specific reset is necessary. The normal Cortex-M reset is performed.
See here for more information: https://wiki.segger.com/J-Link_Reset_Strategies#Type_0:_Normal
Evaluation Boards
- CVA BlueWhale CVM0128-EVB evaluation board: https://wiki.segger.com/CVA_BlueWhale_CVM0128-EVB