Toshiba ESTUDIO170F, Service Manual

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e-STUDIO170F Circuit Description January 2005 © TOSHIBA TEC
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(1) The analog data received from the telephone line is input to the MODEM (IC53) through the NCU
PBA.
(2) The analog data is demodulated to coded data by the MODEM. Then the coded data is trans-
ferred to the SYS area of the SDRAM (SYS-SDRAM: IC1) through the MODEM interface and the
SDRAM controller of the ASIC (IC15).
(3) The coded data is transferred to the CODEC (IC16) through the CODEC interface of the ASIC
where it is decoded to raster data. Then the raster data is transferred to the PIX area of the
SDRAM (PIX-SDRAM: IC1) through the SDRAM controller of the ASIC.
(4) The raster data is transferred to the CODEC where it is coded to data in the JBIG format. Then
the JBIG coded data is transferred to the SYS-SDRAM. This allows all the coded data received
to be stored in the SYS-SDRAM.
(5) The JBIG coded data is transferred to the CODEC where it is decoded to raster data. Then the
raster data is transferred to the PIX-SDRAM.
(6) The raster data is transferred to the CODEC where it is coded in accord with the coding format
(MH, MR or MMR) specified by the PC. Then the coded data is transferred to the PIX-SDRAM.
(7) The coded data is transferred to the PC interface of the ASIC and sent to the PC through the
USB controller (IC49).