Theory of Operation
: Controller
3-31
3.2.4.2 Memory
In addition to the internal RAM, the OMAP 1710 Processor (U6302) features three distinct external
memory interfaces. All memory devices are located on the main board, as elaborated in
Figure 3-22
.
The external memory interface is shown in
Figure 3-23
.
Figure 3-23.
OMAP Memory Interface
3.2.4.3 Asynchronous External Memory Interface
The EMIFS is used for transferring data between the ARM or DSP cores and the 64 MB External
NOR Flash memory (U6304). The Flash memory is a non-volatile memory unit, primarily used to
store the radio's executable code, along with device configuration values, event logs, and
initialization codes. The flash memory is primarily accessed during the main board’s power up and
power down cycles.
3.2.4.4 Flash Memory (6304)
The Flash memory located in close proximity to the OMAP processor is a 64 MB Numonyx 65nm
StrataFlash. The flash interface uses 16 data bits and 25 address bits. The flash IC is enabled by
OMAP processor's CS3 line. The flash IC also features a WAIT line that is capable of halting data
flow between the processor and flash IC while operating in synchronous read mode.
3.2.4.5 CPLD Interface (U6101)
The CPLD (U6101) registers are also mapped to the Asynchronous External Memory Interface.
These registers control the CPLD GPIO pins and enable the OMAP to expand its GPIO capability via
memory mapped IO.
SDATA_15:0
SADD_13:0
DDR_CTRL_5:0
SDCLK
SDCLKX
FADD_25:1
FDATA_15:0
NF_ADV
NF_CS1
NF_CS3
NF_OE
NF_WE
FCLK
NF_RP
FRDY
EMIFF
EMIFS
OMAP
DDR
SDRAM
DDR_CTRL_5:0
A13:0
DQ15:0
CK
CK#
EN_CLKE
A25:1
DQ15:0
EN_CE
EN_RST
EN_WE
CLK
WAIT
ADV
EN_WE
ADDR_5:1
DATA_4:0
CPLD_ADV
CPLD_R/W
CPLD_CS
FLASH MEMORY
CPLD
WAIT_SW_EN
SDCLK_EN
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......