Nokia 2220 Servicehandbuch

RH-42

Troubleshooting Instructions

CCS Technical Documentation

Page 10

 Nokia Corporation          Confidential

Issue 2 09/2003

1 The phone communicates with the prommer via the production test pattern,

using the following signals:

• FBUSTX(serial data 

to phone)

• FBUSRX(serial data 

from phone)

• MBUS(serial clock for FBUSRX)

• VPP(External flashing voltage for speed up flashing)

The BSI line is also used when initializing flashing (battery connector).

2 When the phone is powered (VBAT>3V), the MBUS and FBUSTX lines are pulled 

up internally by the phone.

3 The prommer sends a command to the UEM, using FBUSRX, to enter the Flash-

mode. During the sending of this command, the prommer keeps the BSI line high 
and MBUS is used as a serial clock.

4 When the Flash-mode command is acknowledged, 

UEM enters the Flash-mode 

and releases reset (PURX) to MCU

. 

5 After reset is released, UPP checks if there is a request for the Bootstrap code 

(that resides in the UPP ROM).

6 The request for Bootstrap is the MBUS pulled down by the prommer (if the boot-

strap is not requested, the bootstrap code jumps to FLASH SW).

7 If the Bootstrap code is requested, 

UPP enters the Flash-mode and sets FbusTX to 

'0' as an acknowledgement to the prommer. This is an indication that UPP can 
run, at least, the fixed Bootstrap code – although it is not able to run the FLASH 
code. UPP then sends an UPP-ID to the prommer via the FBUSTX line.

8 After the prommer has received the UPP-ID, it sends a corresponding Secondary 

Boot Code to the phone via FBUSRX. The Secondary Boot Code, when run in UPP, 
requests UPP to send information to the prommer about the flash type and other 
HW-related parameters about the device to be flashed.

9 Prommer then sends the Algorithm Code corresponding to the HW parameters, 

and this algorithm, when run in UPP, takes over handling the MCUSW transfer to 
Flash.

10 12 volts can be supplied to Vpp (by the prommer) to speed up flashing.