Motorola ASTRO XTS 5000 Detailed Service Manual page 57

3-18
3.2.1.2 Encryption 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 SSI lines, serial
communication data lines, and general-purpose I/O lines from the Patriot IC are included in the
interface to the encryption board. A number of jumpers are present on some of the lines so that the
VOCON board configuration to the encryption board can be changed depending on the encryption
type present.
3.2.1.3 Keypad Module Connector P107
This 22-pin connector mates the VOCON board to the keypad module flex used on Model II and III
radios. The keypad module is provided with 5 volts (pins 7 and 8) for the LEDs. The LEDs are
activated by the signal at pin 6, BL_EN. The row signal lines (pins 13, 14, 15, 16, 17, 18, and 19) and
column signal lines (pins 1, 2, and 3) are all at the dual-core processor's GPIO voltage.
3.2.1.4 RF Interface Connector P201
This is a 26-pin compression connector that interfaces between the VOCON board and the
transceiver board. See Section
description of the interface between the VOCON and transceiver boards through P201. Ground clip
M202 is used on the bottom side of the VOCON board to contact the transceiver shield. This
additional connection provides a consistent, common ground with the VOCON board and the radio
chassis.
3.2.1.5 Display Module Connector P301
This 22-pin connector mates the VOCON board to the display module flex used on Model II and III
radios. The NTN9564 VOCON kit has a parallel data interface to the display module. In this design,
two voltages are provided to the display module: 1.8 V and 3 V. The display's parallel data lines (pins
9, 10, 11, 12, 13, 14, 15, and 16), chip select line (pin 5), read/write line (pin 8), register select line
(pin 7), and parallel/serial configuration line (pin 4) are at 1.8-V logic levels.
The NNTN4563 and NNTN4819 VOCON kits have a serial data interface to the display module. In
this design, only 3 V is provided to the display module on pins 17 and 18. The display's serial data
line (pin 16), serial clock line (pin 15), chip select line (pin 5), and register select line (pin 7) are at 3 V
logic levels. The NNTN4717 and NNTN5567 VOCON board has a serial data interface to the display
module, and all the lines are at 2.9 V logic levels.
3.2.2 Controller and Memory
The controller and memory section contains the following components:
• Patriot IC (U401)
• Static RAM (SRAM) IC (U403)
• Flash memory IC (U402)
The Patriot IC acts as both the microcontroller unit (MCU) and the digital signal processor (DSP) for
the radio. The MCU controls receive/transmit frequencies, power levels, display programming, user
interface (PTT, keypad, channel select, etc.), and programming of ICs, as well as other functions.
The DSP performs voice encoding and decoding, audio filtering, volume control, PL/DPL encode
and alert-tone generation, squelch control, and receiver/transmitter filtering, as well as other
functions.
The Patriot IC executes a stored program located in the Flash memory device. The SRAM, a volatile
device, is used as working memory and shares the address and data bus with the Flash memory
device.
November 16, 2006
3.1.1.2 " VOCON Connector P1," on page 3-3
Theory of Operation
: VOCON Board
for a detailed
6881094C31-E