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The display is an TFT type colour display with 65536 colours and 176x208 pixels with backlighting. The UI module
features a function keymat with a 4-way navigation key with a centre selection key.
For imaging purposes, BB supports a VGA camera via the CCP interface, which is integrated in UPP_WD2.
BB description
The BB core is based on UPP_WD2 CPU, which is a PDA version of the DCT4 UPP ASIC. UPP_WD2 takes care of all
the signal processing and operation controlling tasks of the phone as well as all PDA tasks.
For power management, there is one main ASIC for controlling charging and supplying power UEME plus some
discrete power supplies. The main reset for the system is generated by the UEME.
The interface to the RF and audio sections is also handled by the UEME. This ASIC provides A/D and D/A conversion
of the in-phase and quadrature receive and transmit signal paths and also A/D and D/A conversions of received
and transmitted audio signals. Data transmission between UEME and RF and the UPP_WD2 is implemented using
different serial connections (CBUS, DBUS and RFBUS). Digital speech processing is handled by UPP_WD2 ASIC.
A real time clock function is integrated into UEME, which utilizes the same 32kHz-clock source as the sleep clock.
A rechargeable battery provides backup power to run the RTC when the main battery is removed. Backup time
is approximately 5 Hours.
Memory configuration
RM-25 uses two kinds of memories, Flash and SDRAM. These memories have their own dedicated bus interfaces
to UPP_WD2.
Synchronous DRAM is used as the working memory. Interface is 16 bit wide data and 14 bit address. Memory
clocking speed is 123.5 MHz. The SDRAM size is 128Mbits.
SDRAM I/O is 1.8 V and core 1.8 V supplied by UEME regulator VIO. All memory contents are lost if the supply
voltage is switched off.
Multiplexed flash memory interface is used to store the MCU program code and user data. The memory interface
is a burst type FLASH with multiplexed address/data bus, running at 123.5/3MHz.
Configuration of flash memory is a 2x128Mbit stacked flash memory and a 64Mbit flash memory.
Both flash I/O and core voltage are 1.8 V supplied by UEME's VIO.
Energy management
The master of EM control is UEME and with SW it has the main control of the system voltages and operating
modes.
Modes of operation
RM-25 employs several hardware and software controlled operation modes. Main modes are described below.
• NO_SUPPLY mode means that the main battery is not present or its voltage is too low (below UEME master
reset threshold) and back-up battery voltage is too low.
• In BACK_UP mode the main battery is not present or its voltage is too low but the back-up battery has sufficient
charge in it.
• In PWR_OFF mode the main battery is present and its voltage is over the UEME master reset threshold. All
regulators are disabled.
• RESET mode is a synonym for start-up sequence and contains in fact several modes. In this mode, regulators
and oscillators are enabled and after they have stabilized system reset is released and PWR_ON mode entered.
• In PWR_ON mode SW is running and controlling the system.
• SLEEP mode is entered from PWR_ON mode when the system's activity is low (SLEEPX controlled by SW).
• FLASHING mode is for production SW download.
Page 9–6
Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
RM-25
System module
9235618 (Issue 2)
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