JPS6485427A - 8/9 code conversion method - Google Patents
8/9 code conversion methodInfo
- Publication number
- JPS6485427A JPS6485427A JP24298787A JP24298787A JPS6485427A JP S6485427 A JPS6485427 A JP S6485427A JP 24298787 A JP24298787 A JP 24298787A JP 24298787 A JP24298787 A JP 24298787A JP S6485427 A JPS6485427 A JP S6485427A
- Authority
- JP
- Japan
- Prior art keywords
- conversion
- bit data
- dsv
- code conversion
- polarity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To facilitate PLA processing utilizing feature of a small sized ROM by preparing a couple of conversion tables divided depending on the polarity of DSV of 9-bit data after code conversion, selecting a proper conversion table in response to the polarity of a DSV integration value and applying code conversion so as to converge the DSV integration value to zero. CONSTITUTION:A 8/9 coder 11 converts 8-bit data into 9-bit data and in the principles of operation. In terms of the operation principle, a couple of conversion tables A, B divided depending whether the DSV(Digital Sum Variation) representing the DC balance of the 9-bit data after code conversion is positive or negative are prepared and a proper conversion table A or B is selected depending on the polarity of the DSV integration value updated at each conversion and code conversion is applied so that the DSV integration is converged to zero. Thus, two kinds of conversion tables are enough as to the 8-bit data and a proper 9-bit data is read by 256 addresses and the PLA processing utilizing the feature of the small sized ROM is facilitated.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24298787A JPS6485427A (en) | 1987-09-28 | 1987-09-28 | 8/9 code conversion method |
EP88116018A EP0310041A3 (en) | 1987-09-28 | 1988-09-28 | 8-bit to 9-bit code conversion system and 8/9 converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24298787A JPS6485427A (en) | 1987-09-28 | 1987-09-28 | 8/9 code conversion method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6485427A true JPS6485427A (en) | 1989-03-30 |
Family
ID=17097212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24298787A Pending JPS6485427A (en) | 1987-09-28 | 1987-09-28 | 8/9 code conversion method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6485427A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009536469A (en) * | 2006-01-12 | 2009-10-08 | エヌエックスピー ビー ヴィ | Coding method for serial data communication |
-
1987
- 1987-09-28 JP JP24298787A patent/JPS6485427A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009536469A (en) * | 2006-01-12 | 2009-10-08 | エヌエックスピー ビー ヴィ | Coding method for serial data communication |
JP4780350B2 (en) * | 2006-01-12 | 2011-09-28 | エスティー‐エリクソン、ソシエテ、アノニム | Coding method for serial data communication |
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