Gestetner G060, Service Manual

Page: 818 / 1106

BOARDS
G307 4-6 SM
4.2.5 SG3 BOARD
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
circuit.
•
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
•
512KB 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)
D R A M
(4MB)
JBIG
M 6 5 7 6 1
Flash ROM
(4MB)
P r o g r a m
D A T A / A D D R E S S B U S
MN195003MFL
Modem
Flash ROM
(4MB)
M o d e m
D T M F
Receiver
Hybrid IC
C P U
( R U 8 )
D M A C JBIGIF T O N E D P R A M
C C P
SG3-V.34
F C U
Standard
N C U
G307D913.WMF