PXD20RM Datasheet, PDF (185/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Figure 6-5. Password Check Flow
6.5.4.6 Download start address, VLE bit and code size
The next 8 bytes received by the MCU contain a 32-bit Start Address, the VLE mode bit and a 31-bit code
Length as shown in Figure 6-6.
The VLE bit (Variable Length Instruction) is used to indicate for which instruction set the code has been
compiled. The VLE bit should be set to 1 for VLE instruction set or 0 for BookE.
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.
PXD20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor
6-9
Preliminary—Subject to Change Without Notice