Toshiba e-studio 160 - Page Memory Board - Structure; Schematic - Memory Control ASIC and LSI

e-STUDIO160/200/250 PAGE MEMORY BOARD 18 - 4 December 2002 TOSHIBA TEC
(2) Page memory control ASIC (EC-N024)
Address control
This ASIC forms the address on the page memory when the following condition are met:
• When digital image data are written to the page memory.
• When digital image data in the page memory are read.
Data control
This ASIC executes the following operations:
• Controls the images bus on the page memory board.
• Receives and waits for image data transfer control between the compression/decompression LSI
and the page memory.
• Merges image data in the page memory with image data scanned by the digital copier, and writes
image data into the page memory .
Rotation / merge control
This ASIC executes the following operations:
• Receives and wait for digital image data transfer control between the digital copier and the page
memory PC board on the scanner and printer interface.
• Swaps data in the page memory during rotation processing.
(3) Compression / decompression LSI ( PM-22 )
This LSI executes the following operations:
• Compressions image data on the page memory, and forms coded data.
• Decompresses the coding data compressed on the page memory to restore the image data.