Firmware User Manual (AE-step)
17
Revision 1.02
2019-04-24
TLE984x Firmware User Manual
BootROM Startup procedure
3.8.3
Analog Module Trimming
During analog module trimming, the trimming values of PMU, voltage regulators, LIN module, temperature
sensor, oscillator, PLLand other analog modules are read from the NVM configuration sector and written into
the respective SFR registers. In case 100TP pages with data for the trimming process contains CRC errors, the
predefined ones are used.
• 100 Time Programmable data (user data)
– User has eight 100 time programmable pages. The values of the first (page 0) and second (page 1) pages
are automatically copied into the dedicated SFR registers after every COLD or WARM reset thus
replacing the registers default reset values. The user can check them by reading the dedicated SFRs or
by reading directly the content of the page.
– This procedure allows the user to configure the ADC1 . The complete list of SFR registers is provided in
“Appendix D – Analog Module Trimming (100TP Pages)” on Page 110
– In case the first and second 100TP NVM CS (Configuration Sector) pages do not contain valid trimming
data (CRC failure), the BootROM reports error and downloads alternative backup trimming values.
For BootROM reported error handling see
“Post User Mode Entry Recommendations” on Page 12
.
3.8.4
Startup Error Handling
To ensure that the device is properly booted, error checking and error handling are added to the startup
procedure
For USER_BSL_MODE, the overall startup sequence ends up in an endless loop or SLEEP mode in the event
that any called submodule returns an error.
If a startup error occurs – except for double-bit errors for NVM reading – and the boot option is
USER_BSL_MODE, the device is set to a safe mode with limited access to HW resources. If the errors persist
after five (5) WDT1 triggered timeouts, the device enters SLEEP mode.
Regardless of the boot mode, the system enters an endless loop in the case of NVM double-bit errors when
reading the NVM contents.
For BootROM reported error handling see
“Post User Mode Entry Recommendations” on Page 12
.
Note: MON inputs must not be floating in order to prevent an unintended wakeup.
3.8.5
No Activity Counter (NAC) Configuration
A NAC timeout value is stored in the NVM CS. It is stored as a value and bit-inverted value in a dedicated
NVM CS page.
During user mode, this parameter is read from the NVM CS (Configuration Sector) and verified against the
stored inverted value. This parameter is provided as an API parameter when calling the BSL module. For
details, refer to
.
If the NVM CS does not contain a valid NAC, a “wait forever” NAC (NAC=FF
H
) is given to the BSL module .
The BootROM offers 2 user API functions to read and write NAC parameter:
•
•
