DSP56303 datasheet(20/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

1-10

Freescale Semiconductor

DSP56303 Overview

Program memory expansion to one 256 K × 24-bit words memory space using the

standard external address lines

Further features of external memory include the following:

External memory expansion port

Simultaneous glueless interface to static random access memory (SRAM) and dynamic

random access memory (DRAM)

1.7 Internal Buses

To provide data exchange between the blocks, the DSP56303 implements the following buses:

Peripheral I/O expansion bus to peripherals

Program memory expansion bus to program ROM

X memory expansion bus to X memory

Y memory expansion bus to Y memory

Global data bus between PCU and other core structures

Program data bus for carrying program data throughout the core

X memory data bus for carrying X data throughout the core

Y memory data bus for carrying Y data throughout the core

Program address bus for carrying program memory addresses throughout the core

X memory address bus for carrying X memory addresses throughout the core

Y memory address bus for carrying Y memory addresses throughout the core.

The block diagram in Figure 1-1 illustrates these buses among other components. All internal

buses on the DSP56300 family members are 24-bit buses. The program data bus is also a 24-bit

bus.

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