Ricoh B121 - Boards; Fcu

BOARDS
B620 74 SM
4.2 BOARDS
4.2.1 FCU
The FCU (Facsimile Control Unit) controls fax communications, the video interface
to the base copier’s engine, and all the fax options.
FACE3 (Fax Application Control Engine)
• CPU
• Data compression and reconstruction (DCR)
• DMA control
• Clock generation
• DRAM backup control
• Ringing signal/tone detection
FAME (Ricoh Modem)
• V.34, V.33, V.17, V.29, V.27ter, V.21, and V.8
LSD (Line Side Device)
• Data transfer
• Line control
B620D901.WMF
Controller
FACE3
DRAM
(16MB)
DMA BUS
CPU BUS
LINE LSD FAME
Monitor
Speaker
SRAM
(128 KB)
FROM
(3 MB)
MBU
FCU