Motorola Astro Digitalport Saber Detailed 68p81076c10 A Manual

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the ROM in the P: memory space. PS* is used to select A17 to provide 
an additional 128k bytes of space in Dx: memory space for the ROM.
The ADSIC internal registers are decoded internally and start at $E000 
in Dy:. These registers are decoded using A0-A2, A13-15, and PS* from 
the DSP. The ADSIC internal registers are 16 bit wide so only D8-D23 
are used.
The DSP program code is stored in the FLASH ROM U404. During 
normal modes of operation, the DSP moves the appropriate program 
code into the...

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program code contains the interrupt vectors and the reset vector and 
is basically an expanded bootstrap code. When the MCU messages the 
DSP that the ADSIC has been configured, the DSP overlays more code 
from the ROM into external SRAM and begins to execute it. Overlays 
occur at different times when the DSP moves code from the ROM into 
external SRAM depending on immediate mode of operation, such as 
changing from transmit to receive.
MCU System ClockThe MCU (U204) system clock is provided by...

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things, the DSP memory map. While this is happening, the DSP is 
fetching code from the ROM U404 into internal RAM and beginning 
to execute it. It then waits for a message from the MCU that the ADSIC 
has been configured, before going on.
During this process, the MCU does power diagnostics. These 
diagnostics include verifying the MCU system RAM and verifying the 
data stored in the internal EEPROM, external EEPROM, and FLASH 
ROMs.   The MCU queries the DSP for proper status and the results of 
DSP...

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Secure Modules 
8
IntroductionThe secure modules are designed to digitally encrypt and decrypt voice 
and ASTRO data in ASTRO SABER™ radios. This section covers the 
following secure modules:
•NTN7770 • NTN1152
•NTN7771 • NTN1153
•NTN7772 • NTN1158
•NTN7773 • NTN1147
•NTN7774 • NTN1367
•NTN7329 • NTN1368
•NTN7332 • NTN1369
•NTN7331 • NTN1370
•NTN3330 • NTN1371
•NTN7370 • NTN8967
•NTN1146
NOTE:The secure modules are NOT serviceable. The
information contained in this chapter is only
meant to help...

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Circuit DescriptionThe secure module operates from three power supplies (UNSW_B+, 
SW_B+, and +5V). The +5V and the SW_B+ are turned on and off by 
the radio’s on/off switch. The UNSW_B+ provides power to the secure 
module as long as the radio battery is in place.
Key variables are loaded into the secure module through connector 
J601, pin 15. Up to 16 keys (depending on the type of encryption 
module) can be stored in the module at a time. The key can be infinite 
key retention or 30-seconds key...

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Troubleshooting
Procedures
9
Introduction The purpose of this section is to aid in troubleshooting a malfunctioning 
ASTRO Digital SABER radio. It is intended to be detailed enough to localize the 
malfunctioning circuit and isolate the defective component.
Handling 
PrecautionsComplementary metal-oxide semiconductor (CMOS) devices, and other high-
technology devices, are used in this family of radios. While the attributes of 
these devices are many, their characteristics make them susceptible to...

9-2
Equipment for Servicing ESD Sensitive Products,” available from 
Literature Distribution.
Motorola
Literature Distribution
2290 Hammond Drive
Schaumburg, IL 60173
(708) 576-2826
6. Always wear a conductive wrist strap when servicing this 
equipment. The Motorola part number for a replacement wrist 
strap that connects to the table mat is 42-80385A59.
Voltage 
Measurement and 
Signal TracingIt is always a good idea to check the battery voltage under load. This 
can be done by measuring the OPT_B+ pin...

9-3
Power-Up 
Self-Check 
ErrorsEach time the radio is turned on the MCU and DSP perform some 
internal diagnostics. These diagnostics consist of checking the 
programmable devices such as the FLASH ROMs, internal and external 
EEPROMs, SRAM devices, and ADSIC configuration bus checksum. At 
the end of the power-up self-check routines, if an error exists, the 
appropriate error code is displayed on the display. For non-display 
radios, the error codes may be read using the Radio Service Software 
(RSS)...

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5. Start EMC: 
-Set the EMC wake-up line low (emc irq line).
-Wait 5ms. 
-Set the EMC wake-up line high.
-Wait 10ms. 
-Set the EMC wake-up line low (emc irq line).
-Wait 5ms.
-Set the EMC wake-up line high.
6. Begin power-up self-tests.
7. Begin RAM tests:
-External RAM ($1800-3FFF).
-Internal RAM ($1060-$1300).
-External RAM ($0000-$0DFF).
-Display 01/88 if failure.
The radio will get stuck here if the internal RAM is defective. The radio 
uses the internal RAM for stack. The RAM routines use...

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- Fail 02/81 if DSP RAM fails.
-Wait for the ADSIC checksum.
- Fail 02/90 if 100ms.
- Fail 02/90 if failure.
-Wait for the first part of the DSP version number. 
- Fail 02/90 if 100ms.
-Wait for the second part of the DSP version number. 
- Fail 02/90 if 100ms.
11. Display errors if a fatal error exists at this point.
12. Checksum the codeplug.
-Test internal codeplug checksums. 
- Fail 01/92 if failure.
-Test external codeplug checksums. 
- Error 01/82 if non-fatal error; fail 01/82 if fatal error....