PXD10RM Datasheet, PDF (169/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

The Start Address defines where the received data will be stored and where the MCU will branch after the
download is finished. The two LSB bits of the Start Address are ignored by the BAM program, such that
the loaded code should be 32-bit word aligned.
The Length defines how many data bytes have to be loaded.
START_ADDRESS[31:16]
START_ADDRESS[15:0]
VLE
CODE_LENGTH[30:16]
CODE_LENGTH[15:0]
Figure 6-6. Start address, VLE bit and download size in bytes
6.5.4.7 Download data
Each byte of data received is stored into device’s SRAM, starting from the address specified in the
previous protocol step.
The address increments until the number of bytes of data received matches the number of bytes specified
in the previous protocol step.
Since the SRAM is protected by 32-bit wide Error Correction Code (ECC), BAM always writes bytes into
SRAM grouped into 32-bit words. If the last byte received does not fall onto a 32-bit boundary, BAM fills
it with 0 bytes.
Then a “dummy” word (0x0000_0000) is written to avoid ECC error during core prefetch.
6.5.4.8 Execute code
The BAM program waits for the last echo message transmission being completed.
Then it restores the initial MCU configuration and jumps to the loaded code at Start Address which was
received in step 2 of the protocol.
At this point BAM has finished its tasks and MCU is controlled by new code executing from SRAM.
Freescale Semiconductor
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
6-11