Sony UP-21MD Service Manual page 43

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Print data transfer mode
In this mode, the image data that exists in DRAM is output to the SY-299 board as print data during
printing.
The flow of an image signal is as described below.
The data request signal from the SY-299 board is input to CPU (IC501).
The CPU controls a DRAM control circuit (CXD9111R: IC1001), and the DRAM control circuit converts
the image data in DRAM into print data and outputs it. After that, the data is color-adjusted, color-
rotated, and converted from RGB to YMC using a color adjustment circuit (IC901). Next, the data is
masking-converted using two masking ROMs and output to the SY-299 board as print data.
{ Print Mode ]
10608 and others
tO FO SICLK LOCK'
CLK GEN
DACLK
1902-903 = 16905+906
ag aa be
cal
POOL!
ee Pe = a e COLORO/1
|
PDREQ
UP-21MD V1 4-5