Theory of Operation
: Controller
3-33
3.2.4.6 Synchronous External Memory Interface
This interfaces the OMAP to a 32 MB Double Data Rate (DDR) RAM IC (U6301). Upon boot-up
OMAP configures this interface to operate in synchronous mode at 96MHz. This volatile memory unit
is primarily accessed during code execution.
3.2.4.7 Double Data Rate (DDR) Memory (U6301)
The 32MB DDR Synchronous DRAM IC is interfaced to the OMAP using 13 address bits and a 16bit
data bus. The DDR IC is driven by a complementary clock signal originating from the OMAP IC. The
DDR clock is initialized to 96MHz by the OMAP boot code. Additional control signals are also
dedicated for the DRAM interface
.
3.2.4.8 Peripheral Devices
The OMAP processor is equipped with multiple buses and interfaces that are configured for
peripheral interconnection.
3.2.4.8.1 Receive and Transmit SSI
These two interfaces are dedicated for communicating with the RF deck digital interface, carrying
receive and transmit base band signals. The OMAP processor generates the clock and FSYNC
signals for the receive SSI interface. The RF deck generates these signals for the transmit SSI
interface.
Figure 3-22. RX / TX SSI Configuration
RF SECTION
TRIDENT
ABACUS
RX_FSYNC
RX_CLK
RX_DA
TX_FSYNC
TX_CLK
TX_DA
CONTROLLER SECTION
OMAP 1710
MAKO
TI
CODEC
McBSP 2
McBSP 1
RX SSI
TX SSI
3
3
VC_FSYNC
VC_DCLK
SYNC
BCLK
McBSP 2
CPLD
MCLK
WCLK
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......