28 August, 2000
PCBS
2-37
Detailed
Descriptions
VPC
•
Video and command interface to the base copier
Modem (Matsushita: MN195003MFL)
•
V.34, V17, V.29, V.27ter, V.21, and V.8
Energy Saver CPU
•
Power distribution control in energy saver mode
ROM
•
2MB (16 Mbit) flash ROM for system software storage
DRAM
•
The 6 MB of DRAM is shared between SAF Memory (2 MB), ECM Buffer
(128 KB), Page Memory (2 MB), Working Memory (384 kB), and Line buffer
etc (512 kB). The remaining 1 MB of memory is not used.
•
The 2 MB of SAF memory is backed up by the rechargeable battery.
SRAM
•
The 128 KB SRAM for system and user parameter storage is backed up by
the lithium battery.
Oscillators
•
42.20545MHz oscillator for system clock generation
•
32.768MHz oscillator for the real time clock. This is backed up by the
lithium battery.
•
24.192MHz oscillator for the MN195003MFL modem
Jumpers, Switches, and Test Points
Item
Description
SW1
Switches the SRAM backup battery on/off
SW2
Reset switch
SW3
Switches the data transfer direction