2-10
DSP56309UM/D MOTOROLA
Signal/Connection Descriptions
External Memory Expansion Port (Port A)
2.6.2
External Data Bus
External data bus signals for the DSP56309 are listed in
2.6.3
External Bus Control
External bus control signal descriptions for the DSP56309 are listed in
Table 2-7
External Data Bus Signals
Signal
Name
Type
State
During
Reset
Signal Description
D0ÐD23
Input/
Output
weakly
driven by
bus keeper
Data Bus
ÑWhen the DSP is the bus master,
D0ÐD23 are active-high, bidirectional
input/outputs that provide the bidirectional
data bus for external program and data
memory accesses. Otherwise, D0ÐD23 are
weakly driven by the bus keeper.
Table 2-8
External Bus Control Signals
Signal
Name
Type
State
During
Reset
Signal Description
AA0Ð
AA3/
RAS0Ð
RAS3
Output
Tri-stated
Address Attribute or Row Address
Strobe
ÑWhen
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.
RD
Output
Tri-stated
Read Enable
ÑWhen the DSP is the bus master, RD
is an active-low output that is asserted to read
external memory on the data bus (D0ÐD23).
Otherwise, RD is tri-stated.
WR
Output
Tri-stated
Write Enable
ÑWhen the DSP is the bus master, WR
is an active-low output that is asserted to write
external memory on the data bus (D0ÐD23).
Otherwise, the signals are tri-stated.
Содержание DSP56309
Страница 25: ...xxii DSP56309UM D MOTOROLA Figure D 25 Port E Registers PCRE PRRE PDRE D 39 ...
Страница 30: ...MOTOROLA DSP56309UM D 1 1 SECTION 1 DSP56309 OVERVIEW ...
Страница 47: ...1 18 DSP56309UM D MOTOROLA DSP56309 Overview DSP56309 Architecture Overview ...
Страница 48: ...MOTOROLA DSP56309UM D 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Страница 85: ...2 38 DSP56309UM D MOTOROLA Signal Connection Descriptions OnCE JTAG Interface ...
Страница 86: ...MOTOROLA DSP56309UM D 3 1 SECTION 3 MEMORY CONFIGURATION ...
Страница 104: ...MOTOROLA DSP56309UM D 4 1 SECTION 4 CORE CONFIGURATION ...
Страница 124: ...MOTOROLA DSP56309UM D 5 1 SECTION 5 GENERAL PURPOSE I O ...
Страница 125: ...5 2 DSP56309UM D MOTOROLA General Purpose I O 5 1 INTRODUCTION 5 3 5 2 PROGRAMMING MODEL 5 3 ...
Страница 128: ...MOTOROLA DSP56309UM D 6 1 SECTION 6 HOST INTERFACE HI08 ...
Страница 166: ...MOTOROLA DSP56309UM D 7 1 SECTION 7 ENHANCED SYNCHRONOUS SERIAL INTERFACE ESSI ...
Страница 212: ...MOTOROLA DSP56309UM D 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Страница 241: ...8 30 DSP56309UM D MOTOROLA Serial Communication Interface SCI GPIO Signals and Registers ...
Страница 242: ...MOTOROLA DSP56309UM D 9 1 SECTION 9 TRIPLE TIMER MODULE ...
Страница 269: ...9 28 DSP56309UM D MOTOROLA Triple Timer Module Timer Operational Modes ...
Страница 270: ...MOTOROLA DSP56309UM D 10 1 SECTION 10 ON CHIP EMULATION MODULE ...
Страница 302: ...MOTOROLA DSP56309UM D 11 1 SECTION 11 JTAG PORT ...
Страница 369: ...C 22 DSP56309UM D MOTOROLA DSP56309 BSDL Listing ...
Страница 370: ...MOTOROLA DSP56309UM D D 1 APPENDIX D PROGRAMMING REFERENCE ...
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