Motorola APX 7000 Detailed Service Manual page 89

Theory of Operation
: Controller
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 available at pin 12 for the RF connector and pin 56 of the bluetooth option board
connector.
3.2.8 Encryption
The encryption circuitry is placed on the VOCON board and interfaces directly with the VOCON
digital circuitry. The encryption circuitry is designed to digitally encrypt and decrypt voice and ASTRO
data in the APX7000/ APX 7000XE 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 3-54 below shows the Encryption architecture for the APX 7000/ APX 7000XE radio.
AUDIO
CODEC
SSI
Key Key
Retention Fail
Figure 3-54. APX 7000/ APX 7000XE Encryption Architecture
CPLD
CLK SSI GPIO
MACE
(Secure IC)
Tamper
OMAP
SSI
Key
Zeroize
Vocon Bd
3-65