Ricoh D131 Service Manual page 1102

5.2 BOARDS
5.2.1 FCU
The FCU (Facsimile Control Unit) controls fax communications, the video interface to the base
copier's engine, and all the fax options.
FACE3.5 (Fax Application Control Engine)

CPU

Data compression and reconstruction (DCR)

DMA control

Clock generation

DRAM backup control
Modem (FAME2)

V.34, V33, V17, V.29, V.27ter, V.21, and V.8
DRAM

The 16 MB of DRAM is shared as follows.

SAF memory: 4MB

Working memory: 4MB

Page memory: 8MB

The SAF memory is backed up by a rechargeable battery.
ROM

4MB flash ROMs for system software storage
SRAM

The 512 KB SRAM for system and user parameter storage is backed up by a lithium battery.
D619 210 SM