Memory; Lcd Graphics Display Interface - GE MAC 1200 Servicing Instructions

GE Medical Systems MAC 1200 V 1.2 Page 16
Information Technologies 227 492 21 RevF
2.3.6 Memory
The complete memory of the MAC 1200 is located on the PCB Control CS CI.
The software of the device can be loaded through the JTAG Port during the production
process, or for service purposes with the appropriate programming software through the
RS-232 interface.
Program Memory:
Type: Flash, + 3.3V supply
Organization: 1 Mbit x32, 4 Mbyte
Waitstates: 1 Waitstate
DRAM:
Type: EDO DRAM, + 3.3V supply
Organization: 1 Mbit x32, 4 Mbyte
Waitstates: 0 Waitstate
Patient ECG Memory:
Type: buffered SRAM, + 3.3V supply
Organization: 256 Kbit x16, 512Kbyte
Waitstates: 1 Waitstate
Configuration Memory:
The configuration memory is part of the program memory Flash. With special hardware
and software protection facilities, write access to the Flash is only possible in the defined
configuration memory of the Flash. Thus an external configuration Memory like an
EEPROM is not required.
2.3.7 LCD graphics display interface
For the LCD interface to the 4 VGA monochrome LCD interface, the internal LCD
controller of the MPC821 is used.
Controller Interface:
For the digital control signals, delivered from the MPC821, only an output driver is required.