Boards; Fcu - Ricoh D3D9 Field Service Manual

Boards

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)
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CPU
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Data compression and reconstruction (DCR)
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DMA control
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Clock generation
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DRAM backup control
Modem (FAME2)
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V.34, V33, V17, V.29, V.27ter, V.21, and V.8
DRAM
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The 16 MB of DRAM is shared as follows.
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SAF memory: 4MB
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Working memory: 4MB
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Page memory: 8MB
•
The SAF memory is backed up by a rechargeable battery.
ROM
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SRAM
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Memory Back-up
4MB flash ROMs for system software storage
The 512 KB SRAM for system and user parameter storage is backed up by a lithium
battery.
5.Detailed Section Descriptions
155