DSP56364D datasheet(10/162 Pages) MOTOROLA

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Signal/Connection Descriptions

External Memory Expansion Port (Port A)

1-6

DSP56364 Advance Information

MOTOROLA

1.5

EXTERNAL MEMORY EXPANSION PORT (PORT A)

When the DSP56364 enters a low-power standby mode (stop or wait), it tri-states the relevant port A

signals: D0–D7, AA0, AA1, RD, WR, CAS.

1.5.1

External Address Bus

1.5.2

External Data Bus

Table 1-5 External Address Bus Signals

Signal Name

Type

State during

Reset

Signal Description

A0–A17

Output

Keeper

active

Address Bus—A0–A17 are active-high outputs that spec-

ify the address for external program and data memory

accesses. Otherwise, the signals are kept to their previous

values by internal weak keepers. To minimize power dissi-

pation, A0–A17 do not change state when external mem-

ory spaces are not being accessed.

Table 1-6 External Data Bus Signals

Signal Name

Type

State during

Reset

Signal Description

D0–D7

Input/

Output

Tri-stated

Data Bus—D0–D7 are active-high, bidirectional input/out-

puts that provide the bidirectional data bus for external

program and data memory accesses. D0–D7 are tri-stated

during hardware reset and when the DSP is in the stop or

wait low-power standby mode.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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