Motorola DSP56301 User Manual

Page 74

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Memory Maps

-14

DSP56301 User’s Manual

Figure 3-8. 16-Bit Space, Switched Program RAM, Instruction Cache Enabled (1, 1, 1)

Program

$FFFF

$0000

Internal

External

X Data

$FFFF

$0000

$0C00

External

Internal X Data

RAM (3K)

Internal I/O

Y Data

$0400

$FF80

$FFFF

$0000

External

Internal Y Data

RAM (3K)

External I/O

$FF80

(128 words)

Bit Settings

Memory Configuration

Program RAM

X Data RAM

Y Data RAM

Cache

Addressable

Memory Size

1 K

$000–$3FF

3 K

$000–$BFF

3 K

$000–$BFF

1 K

not addressable

64 K

Program RAM (1K)

$0C00

NOTE: External program memory begins immediately after the internal program memory. The
internal memory modules that are mapped to the addresses $0400–$0800 are used as
Instruction Cache space when the Instruction Cache is enabled, and these addresses become
part of the external P memory space.