User Guide

NEM-2
System Module and User Interface CCS Technical Documentation
Page 40 Copyright Nokia. All rights reserved. Issue 1 07/03
Power Up, Power Down and Reset
Phone
Power up, power down and reset of DCT4 Phone part is controlled by the UEMK ASIC.
Audio Player
Audio Player power up, power down and reset is controlled by software via dedicated
hardware signals AudioPlayerPwrEnable, AudioPlayerResetX and AudioPlayerFlashRPX.
Figure below shows the block diagram including Phone reset, Audio Player power con-
trol and Audio Player reset signals.
Figure 8: Phone and Audio Player Reset
Audio Player power- up is initialized by activating power enable signal. After power sup-
ply settling time Audio Player reset signals can be released.
Clocking
Phone part and Audio Player part uses different oscillators. DCT4 Phone clocking concept
is reused without changes. Two oscillators are implemented:
• 32kHz sleep clock
• 26MHz system clock
FMR is connected to UPP FMclk (GENIO3) output pin. FMclk output frequency is set to
32kHz via FM Radio Clock Selection bit in CTSI MCU Clock Control Register 2.
GenIO22
Audio Player Baseband
(DA250, Flash, codec,
amp., MMC, USB)
DCT4 Phone
Power Supply
(UEM)
DCT4 Phone Baseband
(UPP, Flash, RF)
PURX
Flash reset
DLight
backup
battery
main battery
Audio Player Power Supply
charger
control
power
power key
KLight
A
DSP reset
enable
(UEMK)