Canon Super G3 Fax Board-J1 Service Manual page 17

CHAPTER 2 BASIC OPERATION
ASIC (IC43)
µPD82870GD-001-LML from NEC used for ASIC (chip D) serves to control the bi-direc-
tional, parallel communications of the IEEE1284 cable (interface with the main controller
PCB), to control the chips around the MPU, to process detection of off-hook state, and to
process CI counter operations.
G3 FAX Control DIMM Slot (J11)
The 16M-bit flash ROM DIMM installed to this slot contains a program used to control
communications on an analog telephone line. The DIMM may be upgraded by downloading
using a Service Support Tool or by replacement.
ASIC (IC16)
µPD65882GC-015-8EU from NEC is an ASIC (port IC), and is used to control the NCU
and various ports such as for speakers.
SDRAM (IC6)
The 64M-bit SDRAM serves as memory for coding/decoding of image data for transmis-
sion/reception or as a work area for the MPU.
RESET IC (IC3)
The reset IC is used when resetting the MPU of the Board, as when the power is tuned on
or when the voltage of the power drops.
MODEM IC (IC11)
FM336 from CONEXANT is a modem used for G3 modulation as prescribed by ITU-T
V.17, V.21, V.27ter, V.29, and V.34. At time of reception, the received data from the line is
subjected to G3 demodulation as prescribed by ITU-T V.17, V.21, V.27ter, V.29, and V.34.
OGMIC (IC44)
OGMIC is used to reproduce voice messages.
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COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON SUPER G3 FAX BOARD-J1 REV.0 JUNE 2001