DSP56004/D FREESCALE [Freescale Semiconductor, Inc], DSP56004/D Datasheet - Page 12

• Manufacturer Part Number: DSP56004/D
• Description: SYMPHONY AUDIO DSP FAMILY 24-BIT DIGITAL SIGNAL PROCESSORS
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Signal/Connection Descriptions
External Memory Interface (EMI)
1-6
MD0–MD7
MA0–MA14
MA15
MCS3
MA16
MCS2
MCAS:
DRAM refresh disabled
DRAM refresh enabled
MA17
MCS1
MRAS
DRAM refresh disabled
DRAM refresh enabled
MCS0
MWR
MRD
Signal Name
:
Signal
rectional
Table 1-5 External Memory Interface (EMI) Signals (Continued)
Signal
Type
Bidi-
Table 1-6 EMI States during Reset and Stop States
State during
Tri-stated
Reset
Freescale Semiconductor, Inc.
Hardware Reset Software Reset Individual Reset
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Driven High
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DSP56004/D, Rev. 3
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.
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Previous State
.
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Operating Mode
Signal Description
Previous State
Previous State
Previous State
Previous State
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven Low
Driven Low
Previous State
Previous State
Previous State
Previous State
MOTOROLA
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Stop Mode