Canon CanoScan N656U Service Manual - Page 37

IV. CONTROL SYSTEM, A. Outline, - scanner drivers

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CHAPTER 2 IV. CONTROL SYSTEM A. Outline The control system consists of the gate array, buffer RAM (4Mbit), and ROM (2Mbit). The CPU is not equipped with the scanner. The control program in the device driver installed on the host computer controls the scanner operation by setting a comand directly to the gate array register. Buffer RAM is used as a work memory for image processing. The scanner communicates with the host computer via USB interface in the gate array. Host computer Control program gate array USB I/F A0-7 D0-15 Buffer RAM ROM Control signal Figure 2-21 2 - 20 COPYRIGHT © 2000 CANON INC. CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)

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CHAPTER 2
2 - 20
COPYRIGHT
2000 CANON INC.
CANOSCAN N650U/N656U/N1220U REV.0 JUNE 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
IV. CONTROL SYSTEM
A. Outline
The control system consists of the gate array, buffer RAM (4Mbit), and ROM (2Mbit).
The
CPU is not equipped with the scanner.
The control program in the device driver installed on
the host computer controls the scanner operation by setting a comand directly to the gate
array register.
Buffer RAM is used as a work memory for image processing.
The scanner communicates with the host computer via USB interface in the gate array.
Figure 2-21
gate array
ROM
Buffer
RAM
Host computer
Control program
USB
I/F
A0-7
D0-15
Control signal