Motorola DSP56305 Manuel d'utilisateur Page 73

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5-12 Optimizing DSP56300/DSP56600 Applications MOTOROLA
Instruction Cache and Memory Features
Using the Bootstrap ROM
memory port, etc. The boot program initializes the relevant port,
then starts reading data in. The program generally interprets the
first two 24-bit words that are read as the number of words to be
read, and the internal program memory address destination,
respectively. That number of data words is read and written to the
internal memory starting at the given address. The boot program
then passes program control to that address.
Consult the user's manual of the chip you are using to see if the chip
has a boot ROM program, and if it does, what boot options are
available, and what is the expected data format. A full program
listing is also provided.
After the bootstrap program has finished, the mode bits in the OMR
may be modified by the user's program and serve as general
purpose flags. In case of a hardware reset, the value on the interrupt
request pins will be latched again regardless of their previous value.
With these bits written to at will, the user may chose to activate the
boot program by jumping to it's initial address. The program will
study the current value of the OMR and initialize accordingly.
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