GE Dash 3000 Service Manual page 237

Main Microcontroller
Revision A
Assembly Drawings: Theory Of Operation
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 Kb 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
Serial Communications Controller 1
Serial Communications Controller 2
Serial Management Controller 1
Serial Management Controller 2
Interprocessor-Integrated Controller
Serial Peripheral Interface
User Programmable Machine A
User Programmable Machine B
General-Purpose Chip-Select Machine
LCD Controller
PC Card Controller
DMA
System Phase-Locked Loop (SPLL)
Dash 3000/4000 Patient Monitor
2000966-339
Monitor Function
Unity Network
DAS communication
Peripheral expansion communication
Reserved
Batteries, battery charger,
Real-time clock,
EEPROM,
digital potentiometer for display
brightness control
DAC for ECG and BP analog outputs;
ASIC configuration
Memory controller for synchronous
graphics RAM
Memory controller for synchronous flash
Memory and peripheral device control
Color display
Future use
Writer communication
Generation of system clock from crystal
oscillator
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