User Guide

Nokia Customer Care Troubleshooting - Baseband

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

Figure 9: 32 KHz analog sleep clock signal

Flash Programming

Connections to Baseband

The Flash programming equipment is connected to the baseband using test pads for

galvanic connection. The test pads are allocated in such a way that they can be accessed

when the phone is assembled. The flash programming interface consists of the VPP,

FBUSTX, FBUSRX, MBUS, and BSI connections to connection to the BB through the UEM,

which means that the logic voltage levels correspond to 2.78 V. Power is supplied to the

phone using the battery contacts.

Baseband Power Up

The baseband power is controlled by the flash prommer in production and in

reprogramming situations. Applying supply voltage to the battery terminals causes the

baseband to power up. Once the baseband is powered, flash programming indication

begins (see the following "Flash Programming Indication" section).

Flash Programming Indication

Flash programming is indicated to the UPP using the MBUSRX signal between the UPP

and UEM. The MBUS signal from the baseband to the flash prommer is used as a clock

for the synchronous communication. The flash prommer keeps the MBUS line low during

UPP boot to indicate that the flash prommer is connected. If the UPP MBUSRX signal is

low on the UPP, the MCU enters flash-programming mode. In order to avoid accidental

entry to the flash-programming mode, the MCU only waits for a specified time to get