Theory of Operation
: Controller
3-51
3.2.7
Encryption
The encryption circuitry is placed on the keypad board and interfaces to the main board through the
J2301-P2001 connector. The encryption circuitry is designed to digitally encrypt and decrypt voice
and ASTRO data in the APX 2000/ APX 4000 radio. The Motorola Advanced Crypto Engine (MACE)
IC is the main component in the encryption design, and has some discrete support circuitry along
with the interfaces to the main board IC's (CPLD, OMAP, and Audio CODEC).
NOTE:
The MACE IC is NOT serviceable. The information contained in this section is only intended
to help determine whether a problem is due to the MACE IC or the radio itself.
Figure 3-39
below shows the Encryption architecture for the APX 2000/ APX 4000 radio.
Figure 3-39. APX 2000/ APX 4000 Encryption Architecture
As shown in
Figure 3-39
above, the encryption design consists of 5 blocks:
• MACE IC
• Key Loading
• Key Retention
• Tamper
• Key Zeroize.
MACE
(Secure IC)
OMAP
AUDIO
CODEC
SSI
SSI
Key
Zeroize
Tamper
Key
Fail
CPLD
CLK SSI GPIO
Key
Retention
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: ......