Nokia NKC-1X Series Troubleshooting Instructions page 6

NKC-1X
Troubleshooting Instructions
• RFCLK grows to full swing
• The core is ready to run but waiting for the PURX release
• Reset releasing
• The UPP releases the SLEEPX up to the "non sleep" -state to prevent the
2 MCU starts running the Bootsrap Code
• written in stone/ UPP internal ROM
• the program checks if there is any reason for the FDL mode (Flash Down
• If there is an executable code in FLASH and there is no reason for FDL, the
3 MCU runs the FLASH MCU code
• the phone initialization, user interfaces, internal blocks etc.
• Core regulator voltage setting for required DSP speed
• Initializes the DSP and concerning HW
• Releases DSP reset -> DSP starts running
Note: In figure below, the RF_Clk frequency appears to be lower than 19.44MHz
because of a too low oscilloscope sampling frequency (2kS/s).
Page 6
UEM switching the regulators "OFF"
Load)
MCU starts running the MCU program from FLASH.
Nokia Corporation
CCS Technical Documentation
Issue 1 02/03