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6
1. Memory Control Gate Array
GA2 (IC30) is a Memory Controlling Gate Array.
• DMA Control
It is used to transfer data between the following devices.
Scanning Control LSI (GA1)
Page Memory (S-DRAM)
: Scanning Route
Page Memory (S-DRAM)
CODEC (PM22)
: Coding Route
CODEC (PM22)
Page Memory (S-DRAM)
: Decoding Route
Page Memory (S-DRAM)
LSU Unit
: Recording Route
System Memory (S-DRAM)
Page Memory (S-DRAM)
: Report Route
• Rotation Management
The rotation is carried out by the hardware when transferring the route.
• S-DRAM Control
It generates S-DRAM Control Signal for Page memory and Refresh Control when the power is ON.
It does not backup the Page Memory.
• Picture Quality Correction Circuit (Smoothing)
When the receiving data (8 dot/mm x 3.85, 7.7, 15.4 line/mm) is converted to 600 dpi x 600 dpi
resolution, the current printed data and 15 surrounding printed data are sent to the Smoothing ROM
through 16 bit line and the ROM sends smoothed dot data. As a result of this operation, the distorted
curved lines are smoothed.
• Gray-Level Enhancement
This control function allows expressing higher-level scales than using a recorded signal, by reducing
line density into 1/2 or 1/3 on the original after binary-to-multiple value conversion. This capability
increases reproduction of grayscale images such as photographs.
• Reduction / Enlargement Control Circuit
This circuit is used to process the received data so that it fits on the recording paper, according to
the Fax Parameter Settings.
• Synchronization Control Circuit
This circuit is used to synchronize the output of the recorded data with the horizontal synchronizing
output signal from the printer for each line. It controls the resolution of the printer as follows.
16 dot/mm x 15.4 line/mm :
Report data
600 dpi x 600 dpi
:
Copy & Printer Interface
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