Memory Controller And Enhanced Memory Board (Emb) - Gestetner A265 Service Manual

IMAGE PROCESSING
2.2.5 MEMORY CONTROLLER AND ENHANCED MEMORY BOARD
(EMB)
The BICU consists of the memory controller and the DRAM. The functions of each
device are as follows.
Memory Controller:
DRAM (standard 20MB):
The data goes to the memory controller after binary picture processing or grayscale
processing. The data is first compressed and then stored in the DRAM. For
printing, the data from the DRAM goes back to the memory controller, where it is
decompressed and image editing is done (e.g., image rotation, repeat image).
The memory capacity changes after installing optional memory on the BICU board,
as follows.
Binary picture
processing
Grayscale
processing
A265/A267
CÓPIA NÃO CONTROLADA
IPU
Controller
B U S
C P U
BICU
Compressing the 1-bit image data and 2-bit image data
Image rotation
Image data transfer to the DRAM
Stores the compressed data
Working area
A4 6%
ITU-T#4 (12% black)
A4 6%
ITU-T#4 (12% black)
[A4 size, Text mode (Number of pages)]
CÓPIA NÃO CONTROLADA
Optional
D R A M
(48 MB)
Memory
D R A M
(20 MB)
A265D515.WMF
Standard (20 MB)
88
32
Not available
Not available
2-28
20 MB + Optional
(68 MB total)
99
99
99
52
SM