May 28, 2008
6871620L01-C
3-14
VOCON Section
3.2.1.1 Connector J1 (Display and Keypad)
This is a 60-pin connector that mates with the Front-Flip flex on the front housing. The 60
connections on the connector J1 consists of Display (control and data) lines (28), Keypad lines (15),
Earpiece audio lines (2), DC supplies and radio GROUND connections.
3.2.1.2 Connector J2 (Encryption Module, CE Interface Connection and Audio Jack
Connection)
This 30-pin connector mates with the UCM-CE-Audio Jack flex and provides the connections from
the VOCON section to the Encryption Module, the CE Accessory Interface and the 2.5mm Audio
Jack.
Two voltages are provided to the encryption module: UNSWB+ and SWB+. The SAP SSI lines, serial
communication data lines and general purpose I/O lines from the Patriot IC are routed through this
connector.
Connections to the CE accessory connector, which include serial data communication and UCM are
present at pins 18 and 17.
The external audio jack consists of a microphone, audio jack interrupt, PTT line and single-ended
audio.
3.2.1.3 Connector J3 (Buttons and Controls Connection)
This 16-pin connector mates the VOCON section (on the mainboard) to the volume controls and
user buttons (PTT, EMERGENCY, SECURE mode and programmable buttons etc.).
3.2.2
Controller and Memory
The controller and memory section contains the following components:
• Patriot IC (U1401)
• Static RAM (SRAM) IC (U1409)
• Flash memory IC (U1410)
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, menu 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.
NOTE:
Refer to
Table 8.1, “List of Schematics and Boards Overlays,” on page 8-1
for a listing of
VOCON schematics that will aid in the following discussion.
3.2.2.1 Patriot IC U1401
The Patriot IC U1401 is a dual-core processor that contains both 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 0.3mm pitch solder balls. The dual-core processor is supplied with two voltages:
1.875 V and 1.55 V. The 1.55 V supply is used as the core voltage while the 1.875V is used as the
interface to the memory devices and display module.
Most of the pins on the Patriot IC operate from
the 2.9 V supply.
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......