2-6
DSP56367
MOTOROLA
Signal/Connection Descriptions
External Memory Expansion Port (Port A)
2.5
EXTERNAL MEMORY EXPANSION PORT (PORT A)
When the DSP56367 enters a low-power standby mode (stop or wait), it releases bus
mastership and tri-states the relevant port A signals: A0–A17, D0–D23,
AA0/RAS0–AA2/RAS2, RD, WR, BB, CAS.
2.5.1
EXTERNAL ADDRESS BUS
2.5.2
EXTERNAL DATA BUS
2.5.3
EXTERNAL BUS CONTROL
Table 2-5 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 2-6 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 2-7 External Bus Control Signals
Signal
Name
Type
State
during
Reset
Signal Description
AA0–AA2/
RAS0–RAS
2
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 tri-statable outputs with
programmable polarity.
Summary of Contents for DSP56367
Page 16: ...xvi MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 22: ...xxii MOTOROLA List of Figures Figure Number Title Page Number ...
Page 26: ...xxvi MOTOROLA List of Tables Table Number Title Page Number ...
Page 148: ...4 6 DSP56367 MOTOROLA Design Considerations PLL Performance Issues ...
Page 248: ...9 30 DSP56367 MOTOROLA Serial Host Interface SHI Programming Considerations ...
Page 306: ...10 58 DSP56367 MOTOROLA Enhanced Serial Audio Interface ESAI ESAI Initialization Examples ...
Page 389: ...Bootstrap ROM Contents MOTOROLA DSP56367 A 15 end ...
Page 390: ...A 16 DSP56367 MOTOROLA Bootstrap ROM Contents ...
Page 432: ...C 8 DSP56367 MOTOROLA JTAG BSDL ...
Page 484: ...D 52 DSP56367 MOTOROLA Programmer s Reference ...
Page 490: ...E 6 DSP56367 MOTOROLA Power Consumption Benchmark ...
Page 516: ...F 26 DSP56367 MOTOROLA IBIS Model ...
Page 522: ...Index 6 MOTOROLA Index ...
Page 523: ......