User Guide

CC Technical Documentation System Module

RM-11

microphone if it is not properly isolated from the chassis using rubber or some other soft

material. Connection wires to the internal microphone and earphone should be as short

as possible to reduce the interference caused by internal signals.

ESD protection has to be implemented on each external connection that is accessible

during normal operation of the phone.

Test Interfaces

Using the Tomahawk connector’s FBUS connections, the phone HW can be tested by PC

software (i.e., Phoenix test software). In addition, RM-11 also supports a Flash program-

ming interface via the service battery, JTAG, and Ostrich test interfaces. JTAG test inter-

face may be removed from the final product for security reasons.

Production / After Sales Interface

Test pads are placed on the engine PWB for service and production purposes. The same

test pattern is used by the After Market Sales (AMS) group for product testing and soft-

ware upgrades. The following figure shows the top view of the test pads. The FBUS_TX

and RX lines are used to transfer data in or out of the phone. VPP is the Flash program-

ming voltage and the MBUS/CLK line is used as a Flash clock line during flashing.

Flash Interface

Flash programming in production is done through the test pads in Figure 20 on the PWB.

Figure 20: Production/test/after market interface

FBUS Interface

The FBUS is an asynchronous data bus that has separate TX and RX signals. The default

bit rate of the bus is 115.2 kbit/s. The FBUS is mainly used for controlling and program-

ming the phone in production. This is the primary interface used in the RM-11.

MBUS/CLK

GND

FBUS_RX FBUS_TX

VPP