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3.2.3
On-Chip Y Data Memory (Y Data RAM)
The on-chip Y data RAM consists of 24-bit wide, high-speed, internal Static RAM
occupying the lowest 7K (default) or 5K locations in the Y memory space. The size of the
Y data RAM is dependent on the setting of the MS bit (default: MS is cleared). The Y data
RAM default organization is 28 banks of 256 (7K) 24-bit words. Eight banks of RAM can
be switched from the Y data RAM to the Program RAM by setting the MS bit (leaving 5K
of Y data RAM).
3.2.4
Bootstrap ROM
The bootstrap code is accessed at addresses $FF0000 to $FFF0BF (192 words) in program
memory space. The bootstrap ROM cannot be accessed in 16-bit address compatibility
mode. See Appendix AÑBootstrap Programs for a complete listing of the bootstrap
code.
3.3
MEMORY CONFIGURATIONS
Memory configuration determines the size and address range for addressable memory,
as well as the amount of memory allocated to Program RAM, data RAM, and the
instruction cache.
3.3.1
Memory Space Configurations
The memory space configurations are listed in Table 3-3.
Table 3-3 Memory Space Configurations for the DSP56309
SC Bit
Setting
0
1
MOTOROLA
Addressable
Address Range
Memory Size
16M words
$000000Ð
64K words
$0000Ð$FFFF
DSP56309UM/D
Memory Configurations
Number of
Address Bits
$FFFFFF
Memory Configuration
24
16
3-7
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