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Memory, Operating Modes, and Interrupts
DSP56009 Data And Program Memory
3.2.1
X Data ROM
The X data ROM occupies locations $2000–$2BFF in the X data memory space. The
functions contained in the X data ROM are listed in the DSP56009 Technical Data
sheet. For more detailed information, contact the Motorola DSP technical help line.
3.2.2
Y Data ROM
The Y data ROM occupies locations $2000–$26FF in the Y data memory space. The
functions contained in the Y data ROM are listed in the DSP56009 Technical Data
sheet. For more detailed information, contact the Motorola DSP technical help line.
3.2.3
Program ROM
The program ROM occupies locations $2000–$47FF in the program memory space.
The functions contained in the program ROM are listed in the DSP56009 Technical
Data sheet. For more detailed information, contact the Motorola DSP technical help
line.
3.2.4
Bootstrap ROM
The bootstrap ROM occupies locations 0–31 ($0–$1F) and 256–287 ($100–$11F) in two
areas in the bootstrap memory map. The bootstrap ROM is factory-programmed to
perform the bootstrap operation following hardware reset. It either jumps to the
user's ROM starting address (P:$2000), or downloads up to 512 words of user
program from an external Erasable Programmable ROM (EPROM) attached to the
EMI port, or from the SHI port in SPI or I
controlled by the Mode bits (MA, MB, and MC) in the OMR. When in the Bootstrap
mode, the first 512 words of Program RAM are disabled for read but accessible for
write.
Programs are loaded from external EPROM if MC:MB:MA = 001. The internal
Program RAM is loaded with 1,536 consecutive bytes from an EPROM connected to
the EMI. The EPROM is located at the EMI address $0, when operating the EMI in the
Absolute Addressing SRAM mode (EAM[2:0] = 000). It is assumed that the EPROM
is selected (enabled) through the GPIO3 pin, which is driven low in this Bootstrap
mode. The GPIO3 output is programmed to be of the active high/active low type.
3-4
2
C formats. The bootstrap ROM activity is
DSP56009 User's Manual
MOTOROLA
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