GE Medical Systems Dash 3000, Service Manual, Page: 202 / 232

ASSEMBLY DRAWINGS: Theory Of Operation
9-14 Dash 3000/4000 Patient Monitor Revision B
2000966-105
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 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 Dash Function
Serial Communications Controller 1 Unity 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,
• EEPROM,
• 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
PC Card Controller Future use
DMA Writer communication
System Phase-Locked Loop (SPLL) Generation of system clock from
crystal oscillator