Nokia 9110 Service Manual
PAMS
Technical Documentation
RAE–2
BS1
Page 5 – 4
Section 02/99
Introduction
The function of the BS1 PDA module in RAE–2 Communicator device is
to run all applications that utilize the PDA LCD display of the device. The
GEOS operating system is applied on a 486 based PDA module platform.
This processing platform utilizes the communicator–type user interface
which is accessible when the RAE–2 is opened.
to run all applications that utilize the PDA LCD display of the device. The
GEOS operating system is applied on a 486 based PDA module platform.
This processing platform utilizes the communicator–type user interface
which is accessible when the RAE–2 is opened.
Technical Summary
The BS1 PDA module consists of a printed circuit board with a CPU, two
kinds of memories, a Power unit, HF amplifier circuitry, and an IR–trans-
ceiver.
kinds of memories, a Power unit, HF amplifier circuitry, and an IR–trans-
ceiver.
The PDA module is assembled on a single 8–layer printed circuit board.
All components are assembled on one single side. The other side is re-
served for keyboard keypads.
All components are assembled on one single side. The other side is re-
served for keyboard keypads.
Serial ports, DMA– and LCD controller for timers are integrated in the
CPU. The operating system is GEOS supplied by Geoworks.
CPU. The operating system is GEOS supplied by Geoworks.
The BS1 module includes three non–volatile Flash memories which are
used for two kind of purposes. XIP (executed in place) memory is used
for program file storage and RFD (resident flash disk) memory is write-
able for user data.
used for two kind of purposes. XIP (executed in place) memory is used
for program file storage and RFD (resident flash disk) memory is write-
able for user data.
One DRAM Memory is used for the code execution and for the volatile
storage of the internal run–time system data.
storage of the internal run–time system data.
Both memory types (DRAM and Flash) have their own address– and data
bus, routed directly from the CPU.
bus, routed directly from the CPU.
Table 1. Used memory blocks
Memory type
Amount (Bytes)
Flash (XIP)
4M
Flash (RFD)
2M
DRAM
2M
The BS1 PWRU block regulates the PDA module power and controls the
power-up and -down. After a battery has been connected, the PWRU
gives the CPU system voltage and releases the reset as fast as possible
after which the CPU SW has full power management control. The PWRU
also generates and controls the voltages that the PDA LCD uses. The
PDA has a rechargeable back–up battery which the PWRU block charges
when the main battery is connected. The VBACK voltage is normally al-
ways available for real time clock. Power is fed from the battery through
the CMT module to the PDA PWRU. The PWRU has a filter in battery
line to reduce interference from the CMT module. The PWRU provides
power-up and -down. After a battery has been connected, the PWRU
gives the CPU system voltage and releases the reset as fast as possible
after which the CPU SW has full power management control. The PWRU
also generates and controls the voltages that the PDA LCD uses. The
PDA has a rechargeable back–up battery which the PWRU block charges
when the main battery is connected. The VBACK voltage is normally al-
ways available for real time clock. Power is fed from the battery through
the CMT module to the PDA PWRU. The PWRU has a filter in battery
line to reduce interference from the CMT module. The PWRU provides