PCBS
14 June, 2002
6-42
SCP2
. The machine CPU, an Ru30 facsimile engine chip. Utilizes a dual bus
structure with a CPU bus and a DMA bus. The SCP2 controls the following circuits
and functions:
•
DMA (Direct Memory Access).
•
DCR (Data Compressor and Reconstructor). Compresses data before it is sent,
and then de-compresses it after it is received.
•
JBIG Compression
•
Energy Save Mode
MBU (Mother Board Unit).
Contains the following components:
•
FROM. Flash ROM memory that contains the program.
•
DRAM. The standard operating RAM.
•
SRAM. Stores user data and other non-perishable data.
•
Reset/Backup Circuit Battery. Supplies power to SRAM to maintain its data
storage. Data can be uploaded from SRAM to a flash memory card before the
MBU is replaced, and data can be downloaded from the card to SRAM.
•
FROM (Flash ROM).
The program memory. The memory content can be
overwritten with data downloaded from a flash memory card.
•
SRAM (Static RAM).
Stores user settings and other non-perishable data
required for processing. An on-board backup battery maintains the SRAM
content while the machine is powered off.
•
DRAM (Dynamic RAM).
The standard operating RAM of the machine. The SAF
backup circuit will maintain the DRAM content for up to about 12 hours if a power
failure occurs while data are being stored in the SAF.
Converter (3V/5V Converter)
. Interfaces between the 3V output of the FCU and
the 5V required for operation of the service flash memory card.
IC Card (Flash Memory Card Slot)
. Allows connection of the flash memory card
that contains the data to update the program stored in the FROM. Data can be
downloaded from the card to the FROM (program memory), and data can be
uploaded from FROM to the card.
Modem
. Implements a V34 modem (with CODEC) and code and includes a 24.6
MHz modem clock.
Analog Circuit (Analog Processing Circuit)
. Implements modem filtering, 2/4
line switching, and RITONE switching.
MIC (Microphone)
. Used to record messages for the Fax On Demand Unit Type
510 (fax information service).
NCU
. (Network Control Circuit) Implements the interface between the fax system
and the telephone network. An NCU is standard on models equipped with faxes.
Speaker
. Plays the dial tone and dialing during off-hook dialing, warning buzzers,
etc.
Speaker Driver
. Drives the speaker for buzzer alert and monitor sounds.
