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Functional description
1 FUNCTIONAL
DESCRIPTION
1.1 General
The CPU board performs the central data processing of the Light Monitor.
The operating principle of the CPU board is illustrated in
. The CPU board is based around
an embedded 386EX processor. Additionally, the CPU board includes a real time clock, battery
back-up RAM, serial controller, audio generator, D/A converter and display controller connected to
the external processor bus.
The CPU board includes two flash memory circuits. One of the circuits contains the boot code and
the other contains the main software code. The CPU board also includes 4 MB dynamic RAM.
The display, recorder and loudspeaker are all connected directly to the CPU board. The ESTP and
NIBP board are connected to the CPU board via the power supply board.
There is also an ISA connector for PC/E board (PCMCIA & Ethernet board).
The CPU board uses 3.3 V, 5 V and 12 V operating voltages.
386 ex
VGA
controller
PLD
DRAM & ISA
ctrl signals
&
bus buffers
4Mbyte
DRAM
(code & data)
512Kbyte
FLASH
boot&trend
2Mbyte
FLASH
(code)
RTC
& NVRAM
(setup)
Quart
D/A
converter
Audio
attenuator
ISA
connector
address & ctrl
data bus
DRAM address & ctrl
display
memory
µP
supervisor
E2PROM
(config.)
Figure 1
CPU board block diagram
Document No. M1051339
1
Summary of Contents for F-LM1
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