Datex-Ohmeda Anesthesia Delivery Unit S/5, Technical Reference Manual

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Datex-Ohmeda ADU
D-12
Document No. 8502856
You can load the software to 58 ADU B-CPU4..01 board from the Software Card. If the loading for
some reason would fail, the software can be loaded again to the same CPU..014 board, without
consuming a new license.
During the loading of the software is there a unique electronically number written from the CPU board
to the Software Card.
For every new CPU board the software is downloaded to will a new license on the Software Card be
used.
CPU board B-CPU2
The CPU board handles the central processing.
The main features of the CPU board are:
•
80486SLC processor
•
Clock frequency 32 MHz
•
Software cartridge interface
•
2 Mbyte DRAM
•
8 Kb battery backed up SRAM with real time clock
•
32 Kb EEPROM memory
•
4 channel UART:
•
3 channels with handshake signals in AC-TTL logic level
•
1 channels without handshake signals in RS232 level
•
Programmable alarm sound generator
•
5 external and 3 internal interrupts
Control logic
I/O decoding and wait state generation takes place in GAL IC as well as in the processor itself. The
code memory (FLASH) and working RAM (DRAM) are designed to be linear, and static RAM and
EPROM are mapped in I/O space.
Wait state generators
The processor and the GAL IC have internal wait state generators for their predecoded chip select
pins. The other boards connected to the CPU bus also use the wait state generator in the GAL IC.
Halt detection
When the hardware detects HALT nstruction all CPU signals as well as all the outputs to the mother
board are left floating in high impedance state. Only DRAM refreshment cycles continue to occur. The
HALT state will continue until a reset pulse from the digipower board is received.
External bus
External bus signals are AC-TTL logic level signals. Series resistors are used to limit signal ringing
when the signals change status. Additional signal filtering is performed in the mother board.
Main peripherals
QUART 82C684
Four series channel Quart is used.
Sound chip SAA1099
IC SAA1099 is used as alarm sound generator.
SRAM M48T18
Lithium battery backed up 8 Kilobyte static RAM with a real-time clock.