Equipment overview: Theory of operation
2000966-542D Dash 3000/4000/5000 2-29
Main microcontroller
The microcontroller contains two processors:
a true internal and external 32-bit CPU core, and
a communications processor module (CPM).
The CPM contains an 8 kilobyte dual port RAM to communicate with the
CPU core, and once configured communicates with external devices with
minimum CPU intervention. External logic is reduced by the internal
memory controllers and a system interface unit which provides a clock
synthesizer and timers used in this design. Writer communications is
supported by direct memory access and processing performance is
enhanced by 4-kilobyte instruction and data caches.
Microcontroller feature Patient monitor function
Serial Communications Controller 1 CARESCAPE Network
Serial Communications Controller 2 DAS communication
Serial Management Controller 1 Peripheral expansion communication
Serial Management Controller 2 Reserved
Interprocessor-Integrated Controller Batteries, battery charger,
Real-time clock,
digital potentiometer for display
brightness control
Serial Peripheral Interface DAC for ECG and BP analog outputs;
ASIC configuration
User Programmable Machine A Memory controller for synchronous
graphics RAM
User Programmable Machine B Memory controller for synchronous flash
General-Purpose Chip-Select Machine Memory and peripheral device control
LCD Controller Color display
Compact Flash Wireless Card Controller Wireless card
DMA Writer communication
System Phase-Locked Loop (SPLL) Generation of system clock from crystal
oscillator
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