May 28, 2008
6871620L01-C
3-18
VOCON Section
Several other active-low control pins determine what mode the Flash memory is in: the address valid
pin ADV that is connected to the EIM LBA_N signal, the output enable pin EN_OE that is connected
to the EIM OE_N signal, and the write enable pin EN_WE that is connected to the EIM EB1_N
signal. For read mode, the ADV and EN_OE pins are asserted while the EN_WE pin is not asserted.
When the EN_WE is asserted and the EN_OE pin is unasserted, the Flash operates in the write
mode.
illustrates the EIM and memory ICs block diagram.
Figure 3-7. Patriot EIM and Memory Block Diagram
3.2.3
Audio and Power
The audio and power section contains the following components:
• MAKO IC U1304
• 5 V regulator U1101
• Audio Switch U20
• Single-ended Audio Gain stage U9904
The MAKO IC contains a CODEC, amplification, filtering and multiplexing capability for receive and
transmit audio, voltage regulators, an analog-to-digital converter (ADC), and a real-time clock (RTC).
The MAKO IC is programmed by the Patriot IC.
The MAKO IC also contains an audio preamplifier and an audio power amplifier to condition the
received audio signal. Programmable preamplifiers also sets the gain of the microphone audio
signal. These devices internal to the MAKO are programmed by the Patriot IC.
NOTE:
Table 8.1, “List of Schematics and Boards Overlays,” on page 8-1
for a listing of audio
and power-related schematics that will aid in the following discussion.
Dual-Core
Processor
U1401
Flash
U1410
SRAM
U1409
RESET_OUT
LBA_N
CS0_N
EB1_N
OE_N
A(23:0)
D(15:0)
EB0_N
CS2_N
RW_N
Voltage
Translator
RESET
ADV
EN_CE
EN_WE
EN_OE
A(22:0)
D(15:0)
A(18:0)
D(15:0)
EN_OE
LB
UB
CS1
EN_WE
CSO
A(23:1)
A(19:1)
CS2
R_W
MAEPF-27414-B
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: ......