42 Description TM9100 Service Manual
© Tait Electronics Limited August 2005
2.4 Hardware and Software Architecture
Overview This section describes the hardware and software modules of the radio and
their interaction in the functioning of the radio.
2.4.1 Hardware Architecture
The electrical hardware of the radio is implemented on a main board inside
the radio body and a control-head board inside the control head.
For a detailed description and block diagrams of individual circuits, refer to
“Circuit Descriptions” on page 23.
Main Board The main board inside the radio body includes the following circuitry:
■ transmitter
■ receiver
■ frequency synthesizer
■ digital board with a RISC processor and custom logic (implemented on
an FPGA), memory, and a DSP
■ CODEC and audio
■ interface
■ power supply
The main board has an internal options connector which allows internal
options boards to access a variety of discrete and programmable signals.
For more information refer to “Internal Options Connector” on page 39.
For a basic block diagram of the main board, refer to Figure 2.10 on
page 43.
For a more detailed block diagram of the transceiver, refer to Figure 2.12 on
page 48 (analog mode) and Figure 2.13 on page 49 (digital mode).
Control-Head Board The control-head board includes:
■ the circuitry needed for the controls and indicators on the front panel
■ with a RISC processor and custom logic (implemented on an FPGA),
and memory
For a block diagram of this control-head board, refer to Figure 3.11 on
page 91.
The control head has a concealed microphone inside the control head and
also has a provision for a separate circuit board that may be designed to
perform a variety of tasks including—but not limited to—Bluetooth
connectivity. No separate circuit board is required for a dynamic
microphone.
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