BOARDS 9 March 2004
4-2
4.2 BOARDS
4.2.1 FCU
The FCU (Fax Control Unit) controls the fax communications, the video interface
(with the copier BICU), and the fax option.
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
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