K630 - V640 - K660
1215-3608 rev. 1
FUNCTIONAL OVERVIEW
FU
N
C
T
IO
N
A
L O
V
E
R
V
IE
W
System connector pin out:
1
Vbus
2
SP
Ref
5
Sp
L
/
DBG
TX
6
Sp
R
/
DBG
RX
4
Mic-
/
Aux in
R
7
Video
/
Strobe
8
AID
/
ACB
/
Vpp
Flash
9
GND
10
D+
/
DTMS
3
Mic+
/
Aux in
L
11
D-
/
DFMS
12
DCIO
Clocks
Clock Distribution
The clocking for the access and application subsystems is separated. This means that
they can wake up or go to sleep mode independently. The access subsystem is clocked by the
26 MHz Voltage Controlled Crystal Oscillator (VCXO) located in the GSM/EDGE module N1200
(Thor). When the access subsystem has a job to do, the Master Clock (MCLK) signal is
requested from the RF part. Most other clocks needed within the access subsystem are
generated from the MCLK. Some minor parts like sleep timer and cable detect use the 32 kHz
real-time clock. The 32 kHz real-time clock clocks the application subsystem, and all other
internal clocks needed within the application subsystem are generated from this clock. However,
when audio is transferred between the application and the access subsystems, the MCLK is
used.
Master Clock
(26 MHz)
The 26.00 MHz VCXO-based MCLK is distributed as a square wave signal from the
GSM/EDGE circuit. In order to have full control over the load on the MCLK, only the access side
of the digital baseband controller is allowed to request the MCLK. However, by indirect means
also the application side CPU can issue the request. A VCXO-based square wave is also
distributed to the WCDMA circuit, but is turned on only upon a command from the digital
baseband controller.
Real-time Clock
(32. 768 KHz)
A 32.768 kHz crystal oscillator provides a low frequency clock whenever the phone has power.
This clock is used to keep the Real-Time Clock (RTC) block functioning, so that the phone can
keep track of the time and date. The low frequency clock is generated in the analog baseband
controller N2000 (Vera) and distributed to the digital baseband controller D2000 (Anja), and if
necessary to external devices like Bluetooth, FM radio and A-GPS.
Technical Description
SEMC Troubleshooting Manual
74
(96)