BOARDS
10 February 2005
B750 118 SM
5.2.3 SG3 BOARD
The SG3 board allows up to three simultaneous communications when used in
combination with the FCU and optional G3 boards. The NCU is on the same board
as the common SG-3 board. This makes the total board structure smaller. But, the
specifications of the SG3 board do not change.
NCCP (New Communication Control Processor)
•
Controls the SG3 board.
•
CPU (RU30)
•
DPRAM (Dual Port RAM): Handshaking with the FCU is done through this block.
•
DMA controller
•
JBIG
•
DSP V34 modem (RL5T892): Includes the DTMF Receiver function
•
DCR for MH, MR, MMR, and JBIG compression and decompression
FROM
•
1Mbyte flash ROM for SG3 software storage and modem software storage
SDRAM
•
8Mbyte DRAM shared between ECM buffer, line buffer, and working memory
AFE (Analog Front End)
•
Analog processing
CODEC (COder-DECoder)
•
A/D & D/A conversions for modem
REG
•
Gen3.3 V from the +5V from the FCU
SG3-D
SG3-D
FCU
NCCP
FROM
(1MB)
SDRAM
(8MB)
CODEC
NCU
REG
DSP
(modem)
DMAC
CPU
(Ru30)
JBIG
DCR
DPRAM
AFE
+5V
+3.3V
G3 Board
Line
B750D902.WMF
Содержание B156
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Страница 597: ...Duplex Unit B509 DRIVE LAYOUT SM 5 B509 2 3 DRIVE LAYOUT 1 Inverter motor 2 Transport motor B509D103 WMF 1 2...
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