Motorola DSP96002 User Manual

Page 159

MOTOROLA

DSP96002 USER’S MANUAL

9 - 3

If the Host Interface flag HF1 is set, the bootstrap program assumes that the external host processor
is a 32-bit wide source which will supply up to 1,024 32-bit words to load into the program RAM.
The external host processor may terminate the bootstrap program by setting the Host Interface flag
HF0.

Enter Mode 0 or 1 by writing to the OMR. This action will begin a timed delay to remove the
bootstrap ROM from the program memory map.

This timed delay is exactly timed to allow the boot program to execute a NOP then a JMP to
location $00000000 and begin execution of the user’s program.

The user may also select a bootstrap mode by writing into the OMR. This technique allows the
DSP96002 programmer to re-boot his system. From any operating mode, the user may program the
OMR to the required bootstrap mode. This begins a timed delay to map the bootstrap ROM into the
program address space. This timed delay is exactly timed to allow the programmer to execute a
NOP then a JMP to bootstrap ROM location $00000000 and begin the bootstrap process described
above in steps 1 to 6.

Mode 0 Mode 1 Mode 2 Mode 3

$FFFF- $FFFF- $FFFF- $FFFF-
FFFF FFFF FFFF FFFF

External External External External
Program Program Program Program
Memory Memory Memory Memory

$0000- $0000-
03FF Internal 03FF Internal
Program Program
RAM RAM

$0000- $0000- $0000- $0000-
0000 0000 0000 0000

HW Reset:

$FFFFFFFE $FFFFFFFE $00000000 $00000000

Port A Port B Port A Port B

Figure 9-2. DSP96002 Program Memory Maps