JBIG control is performed by converting codes using the MN86064, a CODEC LSI chip that is fully compliant with ITU-T.85 (JBBIG Facsimile Application). Major

functions of the MN86064 are listed below. The system configuration is shown on the next page.

Coding/decoding (MH, MR, MMR, JBIG)

Code conversion (between different types of codes)

Scaling (Horizontal scanning = 0.1% to 400%; Vertical scanning = 0.006% to 400%)

Decoding error processing (leading line or white line)

Both ends white masking

Time-division multiplexing

Code conversion

At the time of reception, JBIG codes are converted to image data in this LSI chip. At the time of transmission, image data is converted to MMR data and then this

MMR data is converted to JBIG data in this LSI chip.

CPU access

This LSI chip allows both 16-bit word access and 8-bit byte access. However, since this LSI has registers that allow only byte access, so it performs word access

and byte access only in 16-bit spaces.

The CPU read (word access) timing chart is shown on the next page.

Service Guide OKIFAX 5750/5950

Chapter A Board Descriptions

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