DSP56004ROM datasheet(12/82 Pages) FREESCALE

12 / 82 page

1-6

DSP56004/D, Rev. 3

MOTOROLA

Signal/Connection Descriptions

External Memory Interface (EMI)

MD0–MD7

Bidi-

rectional

Tri-stated

Data Bus

—These signals provide the bidirectional data bus for

EMI accesses. They are inputs during reads from external

memory, outputs during writes to external memory, and tri-

stated if no external access is taking place. If the data bus width

is defined as four bits wide, only signals MD0–MD3 are active,

while signals MD4–MD7 remain tri-stated. While tri-stated,

MD0–MD7 are disconnected from the pins and do not require

external pull-ups.

Table 1-6

EMI States during Reset and Stop States

Signal

Operating Mode

Hardware Reset

Software Reset Individual Reset

Stop Mode

MA0–MA14

Driven High

Previous State

MA15

MCS3

Driven High

Previous State

Driven High

Previous State

Driven High

MA16

MCS2

MCAS:

DRAM refresh disabled

DRAM refresh enabled

Driven High

Previous State

Driven High

Driven Low

Previous State

Driven High

MA17

MCS1

MRAS

DRAM refresh disabled

DRAM refresh enabled

Driven High

Previous State

Driven High

Driven Low

Previous State

Driven High

MCS0

Driven High

MWR

Driven High

MRD

Driven High

Table 1-5

External Memory Interface (EMI) Signals (Continued)

Signal Name

Signal

Type

State during

Reset

Signal Description

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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