Sig4 Board - Ricoh B051 Service Manual

5.2.7 SIG4 BOARD

Flash
ROM
Reset
Circuit
The SiG4 (Standard ISDN G4) board contains ICCP (ISDN Communication Control
Processor), Flash ROM, DRAM, LAPD controller, CODEC, ISDN interface and
analog interface. The ICCP controls the entire board.
ICCP (ISDN Communication Control Processor)
• 16 bit CPU which controls the entire board
• HDLC control
• Channel select for B channel interface control
CODEC
• A/D, D/A converter for ISDN G3 communication
LAPD Controller
• ISDN layer 1 and LAPD control
ROM
• 512 kB (4 Mbit) Flash ROM for system software storage
DRAM
• 2MB (16 Mbit) DRAM used
SM
CÓPIA NÃO CONTROLADA
DRAM
SYSTEM BUS
Dch
Bch LAPD
ICCP
Controller
CODEC
FCU
133
CÓPIA NÃO CONTROLADA
SiG4
ISDN
Interface
Analog I/F
Circuit
MODEM
BOARDS
ISDN
B502D500.WMF
B502