Theory of Operation: Controller 3-57
3.2.7.4 MAKO Interface
MAKO supplies some DC regulation and I/O support for the RF board. The main battery supply is
provided by the RF board and is connected to MAKO. Regulated DC supplies based on this battery
voltage are then provided by MAKO to the RF board. These supplies are VSW1, LDO2, and V6. The
Power On Reset (POR) reset signal is also provided by MAKO to reset the RF board.
The One-Wire signal from the battery is provided by the RF board to MAKO's One-Wire
segmentation circuit, which then connects the One-Wire data path to the OMAP IC. The TUNE,
ISET, and TEMP signals are also interfaced to the MAKO IC.
3.2.7.5 TX Inhibit
The TX Inhibit I/O is reserved for future Option Board use, and is available at pin 12 for the RF
connector and pin 56 of the option board connector.
3.2.8 Encryption
The encryption circuitry is placed on the expansion board and interfaces to the VOCON through the
J4001-P2001 connector. The encryption circuitry is designed to digitally encrypt and decrypt voice
and ASTRO data in the APX 5000/APX 6000/APX 6000XE/SRX 2200 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 VOCON 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 3-41 below shows the Encryption architecture for the APX 5000/APX 6000/APX 6000XE/SRX
2200 radio.
Figure 3-41. APX 5000/ APX 6000/ APX 6000XE/ SRX 2200 Encryption Architecture
MACE
(Secure IC)
OMAP
AUDIO
CODEC
Vocon Bd
SSI
SSI
Key
Zeroize
Tamper
Key
Fail
CPLD
CLK SSI GPIO
Key
Retention
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