e-STUDIO170F Circuit Description
January 2005 © TOSHIBA TEC
7 - 24
7.3.1
Memory Circuit
Fig.7-19
The memory circuit consists of the memories for storing data, including the Flash ROM, SRAM and
SDRAM, Main-CPU (IC22) for read/write control, ASIC (Engine controller: IC15), and other peripheral
devices.
IC23 is a 2 M-Byte Flash ROM in which system programs, language data, and function settings are
stored. Data communication is carried out on the CPU data bus (CPD0-15) and CPU address bus
(CPA1-20).
IC51 is a 128 K-Byte SRAM where clock information and user setting information are stored. This
SRAM is backed up by a lithium battery. The life of the lithium battery is about 5 years. Data communi-
cation is carried out on the CPU data bus (CPD0-15) and CPU address bus (CPA1-16).
IC4 is a 64 K-Byte SRAM and used as a work memory for the CODEC (IC16). Data communication is
carried out on the CODEC work data bus (ALD0-7, RD0-7) and CODEC work address bus (RA0-14).
IC1 is a 16 M-Byte SDRAM and divided into 2 areas, SYS and PIX. The SYS area is used as the Image
Memory to accumulate the image data encoded JBIG, the ECM buffer, the Transmit/receive data buffer
or the Work memory. The PIX area is used as the buffer of the Page memory to store the print data or
the Scan/CODEC/PC. This SDRAM is backed up by a nickel-metal hydride battery. This battery is usu-
ally charged by +5V voltage (+5VPS and +5V). If the electricity from the LVPS is interrupted due to the
power being turned OFF or a power failure, this battery supplies power to SDRAM. When the battery is
fully charged, the backup time is about 1 hour. Data communication is carried out on the SDRAM data
bus (SDD0-15) and SDRAM address bus (SDA0-11).
RD0-7
ALD0-7
RA0-14
CPD0-15
CPD0-15
CPA1-20
CPA1-23
CPD0-15
PMID0-7
CPA1-23
PMOD0-7
CPD0-15
CPA1
CPA1-16
CPD1-15
SDD0-15
SDA0-11
3.3VB2
3.3VB
+5VPS +5V
IC51
SRAM
128 KB
BT101
Li battery
Ni-MH
battery
IC23
Flash ROM
2 MB
IC22
Main-CPU
Main PBA
IC1
SDRAM
16 MB
IC15
ASIC
(Engine controller)
IC16
CODEC
IC4
SRAM
64 KB
IC2, 3
Regulator
Содержание ESTUDIO170F
Страница 1: ...SERVICE MANUAL PLAIN PAPER FACSIMILE e STUDIO170F File No SME04002900 R04102171300 TTEC Ver01_2005 05 ...
Страница 2: ... 2005 TOSHIBA TEC CORPORATION All rights reserved ...
Страница 192: ...e STUDIO170F Function Settings January 2005 TOSHIBA TEC 4 132 ...
Страница 214: ...e STUDIO170F Mechanical Description January 2005 TOSHIBA TEC 5 22 ...
Страница 308: ...e STUDIO170F Circuit Description January 2005 TOSHIBA TEC 7 78 ...
Страница 372: ...e STUDIO170F Removal Replacement Adjustment January 2005 TOSHIBA TEC 8 64 ...
Страница 490: ...e STUDIO170F Appendix January 2005 TOSHIBA TEC 12 8 ...
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