Table 3-6. Vocon Clock Distribution - Motorola APX 7000 Detailed Service Manual

Theory of Operation
: Controller
3.2.3 Clock Sources
The VOCON board contains multiple crystal clock sources. These sources are active upon power-
up. Secondary clock frequencies are derived on the VOCON board from these crystal sources. In
addition to the crystal frequencies, the VOCON receives a 16.8 MHz sine wave from the RF board,
which is shaped into square wave and fed to the OMAP timer input. Screen shots and test points for
these clock signals are shown in
EXPANSION
Clock Frequency
Source
Y6501 24.576 MHz
Y6502 32.768 kHz
Y6601 12 MHz
U6302 96 MHz
U6101 4 MHz
U6101 32.768 kHz
Y701 16.8 MHz
(RF
board)
Chapter
RF BOARD
TRIDENT
26 MHz
GPS
Figure 3-29. VOCON Clock Architecture

Table 3-6. VOCON Clock Distribution

Type
Crystal MAKO 24 MHz & tapped into CPLD
Oscillator
Crystal MAKO RTC
Oscillator
Crystal OMAP CPU Clock
Oscillator
OMAP GPIO DDR Clocks (Complementary signals)
CPLD GPIO MACE Clock
CPLD GPIO GPS RTC clock
Crystal RF Freq. synth. IC (Abacus) TCXO
Oscillator
6.
VOCON
SQUARING
16.8 MHz
32.768 kHz
12 MHz
CPLD
32.768 kHz
24.576 MHz
MACE
4.096 MHz
Description
DDR
96 MHz
OMAP
MAKO
Clock Suggested
Recipent Probe Points
U6501, U6101 R6578, R6572
U6501 C6541
U6302 C6601
U6301 TP6307 &
TP6308
U5003 R6113
U2206 R6115
(Expansion
Board)
U6302 R6218
3-39