DSP56004 View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
Manufacturer
DSP56004 Datasheet PDF : 82 Pages
| |||
Freescale Semiconductor, Inc.
Signal/Connection Descriptions
External Memory Interface (EMI)
Table 1-5 External Memory Interface (EMI) Signals (Continued)
Signal Name
Signal
Type
State during
Reset
Signal Description
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
MA15
Driven High
Driven High
Previous State
Driven High
Previous State
Previous State
Previous State
Previous State
MCS3
MA16
Driven High
Driven High
Driven High
Driven High
Driven High
Previous State
Driven High
Previous State
MCS2
Driven High
Driven High
Driven High
Driven High
MCAS:
DRAM refresh disabled
DRAM refresh enabled
MA17
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven Low
Previous State
Driven High
Driven High
Previous State
MCS1
Driven High
Driven High
Driven High
Driven High
MRAS:
DRAM refresh disabled
DRAM refresh enabled
MCS0
MWR
MRD
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven Low
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
Driven High
1-6
DSP56004/D, Rev. 3
MOTOROLA
For More Information On This Product,
Go to: www.freescale.com
Share Link: 