DSP56362AD datasheet(14/168 Pages) MOTOROLA

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1-6

DSP56362 Advance Information

MOTOROLA

Signal/Connection Descriptions

External Memory Expansion Port (Port A)

External Address Bus

External Data Bus

External Bus Control

Table 1-5 External Address Bus Signals

Signal

Name

Type

State during

Reset

Signal Description

A0–A17

Output

Tri-stated

Address Bus—When the DSP is the bus master,

A0–A17 are active-high outputs that specify the

address for external program and data memory

accesses. Otherwise, the signals are tri-stated. To

minimize power dissipation, A0–A17 do not change

state when external memory spaces are not being

accessed.

Table 1-6 External Data Bus Signals

Signal

Name

Type

State during

Reset

Signal Description

D0–D23

Input/Output

Tri-stated

Data Bus—When the DSP is the bus master,

D0–D23 are active-high, bidirectional input/

outputs that provide the bidirectional data bus for

external program and data memory accesses.

Otherwise, D0–D23 are tri-stated.

Table 1-7 External Bus Control Signals

Signal

Name

Type

State during

Reset

Signal Description

AA0–AA3/

RAS0–

RAS3

Output

Tri-stated

Address Attribute or Row Address Strobe—When

defined as AA, these signals can be used as chip selects

or additional address lines. When defined as RAS, these

signals can be used as RAS for DRAM interface. These

signals are can be tri-stated outputs with programmable

polarity.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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