Motorola SSETM 5000 service manual Functional Blocks

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 2-29for 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 2-24for 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 2-31for 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 2-31for details on the display module.

2.5.2Functional 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

2.5.2.1.1Dual-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.

6881094C12-A November 11, 2004