Firmware User Manual (AE-step)
8
Revision 1.02
2019-04-24
TLE984x Firmware User Manual
Overview
2.2
Program Structure
The different sections of the BootROM provide the following basic functionality.
Startup procedure
The startup procedure is the main control program in the BootROM. It is the first software-controlled
operation in the BootROM that is executed after any reset.
The startup procedure performs initialization steps and decode the pin-latched values of the TMS and P0.0 to
determine which mode to execute.
User mode
It is used to support user code execution in the NVM address space. However, if the NVM is not protected and
the Bytes at address 11000004
H
-11000007
H
are erased (FF
H
), then device enters sleep mode.
If a valid user reset vector was found at 11000004
H
(values at 11000004
H
- 11000007
H
not equal to FFFFFFFF
H
)
and a proper NAC value is found then the BootROM proceeds into user mode.
In case an invalid No Activity Counter value is found (see also
), the device waits
indefinitely for a FastLIN BSL communication.
LIN BSL mode
It is used to support BSL via LIN like protocol. Downloading of code/data to RAM and NVM related
programming is supported in this mode.
FastLIN BSL mode
It is used to support BSL via FastLIN protocol. Downloading of code/data to RAM and NVM is supported in this
mode.
2.3
RAM Structure for User
With user mode entry, the entire RAM is available to the user, but upon a reset the BootROM uses parts of the
RAM for variables and for its program stack. For a reset type with no RAMBIST execution (e.g. softreset), user
data outside the BootROM reserved RAM range will not get changed.
The BootROM RAM range is defined to go from 0x1800.0000 - 0x1800.03FF
