Motorola SSETM 5000 - Manual (Page 41)

6881094C12-A November 11, 2004
Theory of Operation: VOCON Board 2-19
21, and 22. Connections to the external accessory connector, which include serial communication
data lines, external audio, and option select lines for controlling audio modes, are present at pins 1
through 13. Switched battery voltage (B+SENSE) is provided on pin 32. Most of the pins at this
connector have ESD protection devices and components. See
Section 2.5.2.3.3: “Universal
Connector Interface Circuitry” on page 2-29 for more details on this connection circuitry.
2.5.1.3 Internal Speaker and Microphone Flex Connector M102
The audio switching between the internal and accessory microphones is controlled via flex connector
M102. See
Section 2.5.2.2.1: “GCAP II IC U501” on page 2-24 for a discussion of this audio
switching.
2.5.1.4 Control Top Flex Connector J707
The control top switches and side controls are connected through a flex circuit to the controller at
J707. See
Section 2.5.4: “Controls and Control Top Flex” on page 2-31 for a discussion of these
controls.
2.5.1.5 Encryption Module Connector J701
This 40-pin connector provides the interface between the VOCON board and the encryption module.
Two voltages are provided to the encryption board: UNSWB+ and SWB+. The SAP (Serial Audio
Port) SSI lines, serial communication data lines, and general-purpose I/O lines from the dual-core
processor are included in the interface to the encryption board.
2.5.1.6 Display Module Connector J301
This 20-pin connector (J301) mates the VOCON board to the display module flex. The VOCON kits
have a serial data interface to the display module. In this design, only 2.9 V is provided to the display
module on pins 11 and 14. The display’s serial dataline (pin 18), serial clock line (pin 7), and chip
select line (pin 3) are at 2.9V logic levels. See
Section 2.5.3: “Display Module” on page 2-31 for
details on the display module.
2.5.2 Functional Blocks
2.5.2.1 Controller and Memory
The controller and memory section contains the following components:
• Dual-core processor (U401), which acts as both the microcontroller unit (MCU) and the digital
signal processor (DSP) for the radio
• Static RAM (SRAM) IC (U403), a volatile device, which is used as working memory and shares
the address and data bus with the Flash memory device
• Flash memory IC (U402), which contains host firmware, DSP firmware, and some codeplug
data
2.5.2.1.1 Dual-Core Processor U401
The dual-core processor U401 contains a 32-bit microcontroller unit (MCU) and a 16-bit digital signal
processor (DSP) in one IC package. It comes in a 256-pin, ball-grid array (BGA) package with 1mm
pitch solder balls. Most of the pins on the dual-core processor operate from the 3 V supply. A 1.55 V
supply is used for the core voltage and the clock amplifier module. The remaining pins of the
processor use a 2.9 V supply. The External Interface Module (EIM) utilizes a 1.85 V supply.
There are also two system clocks provided to the dual-core processor.