Ricoh B003 Service Manual page 755

BOARDS
4.2.4 SG3 BOARD
FCU
Flash ROM
The SG3 board allows up to two simultaneous communications when used in
combination with the FCU.
CCP (Communication Control Processor)
• Controls the SG3 board.
• CPU (RU8)
• DPRAM (Dual Port RAM): Handshaking with the FCU is done through this
block.
• DMA controller
• JBIG interface
Flash ROM
• 512KB (4 Mbit) flash ROM for SG3 software storage.
• 512KB (4 Mbit) flash ROM for Panasonic modem software storage.
DRAM
• 512 KB DRAM shared between ECM buffer, line buffer, and working
memory.
QM coder
• QM coder for JBIG compression and decompression.
V.34 Modem
• Panasonic V.34 modem (MN195003MFL)
B003/B004/B006/B007
CÓPIA NÃO CONTROLADA
CCP
CPU
DPRAM DMAC JBIGIF TONE
(RU8)
DATA/ADDRESS BUS
DRAM
(4MB)
(4MB)
Program
4-6
CÓPIA NÃO CONTROLADA
DTMF
Hybrid IC
Receiver
Flash ROM
MN195003MFL
(4MB)
Modem
Modem
JBIG
M65761
SG3-V.34
Standard
NCU
B360D513.WMF
SM