TW265473B - Three-level coding method for read only memory and device thereof - Google Patents

Three-level coding method for read only memory and device thereof

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Publication number
TW265473B
TW265473B TW84106545A TW84106545A TW265473B TW 265473 B TW265473 B TW 265473B TW 84106545 A TW84106545 A TW 84106545A TW 84106545 A TW84106545 A TW 84106545A TW 265473 B TW265473 B TW 265473B
Authority
TW
Taiwan
Prior art keywords
code
bit
data
replacing
intermediate code
Prior art date
Application number
TW84106545A
Other languages
Chinese (zh)
Inventor
Ferng-Chuen Lii
Original Assignee
United Microelectronics Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by United Microelectronics Corp filed Critical United Microelectronics Corp
Priority to TW84106545A priority Critical patent/TW265473B/en
Application granted granted Critical
Publication of TW265473B publication Critical patent/TW265473B/en

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Abstract

A three-level coding method of read only memory, that is applicable to one three-level data array which has N-bit three-level cell storage code with two-bits as one set, and those which could not be assigned to set are viewed as independent bit, comprises the steps of: 1. performing three-level coding to one N-bit data, but when continuously meeting three or more than three sets of same sequence data, then reserving the first set of those same sequence data, and replacing the second set with one identification code as start code, replacing the third set with one identification code as end code, leaving the rest sets of same sequence data; 2. with the above coded N-bit three-level cell storage code through one sensing amplifier generating corresponding N-bit intermediate code, and with every two as one set, those which could not be assigned to set are viewed as one intermediate independent code; 3. inputting the above each set of intermediate code to one coding device; 4. when the intermediate codes of two adjoining two sets are different, the coding device output those intermediate data; 5. when one set of received data is confirmed as identification code, it is viewed as start code the first time, and in sequence replacing intermediate code of each set with intermediate code of each former set, then outputting; 6. until one set of received data is confirmed as identification code the second time, it is viewed as end code, and replacing intermediate code of the set with intermediate code of each former set, then outputting, in the same time, back to step 4, if there is no end code, then continuously replacing intermediate code of the set with intermediate code of each former set until end; 7. with the above intermediate code of each set processed by coding device, combined with another one independent intermediate code, as decoding source of decoding circuit.
TW84106545A 1995-06-26 1995-06-26 Three-level coding method for read only memory and device thereof TW265473B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW84106545A TW265473B (en) 1995-06-26 1995-06-26 Three-level coding method for read only memory and device thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW84106545A TW265473B (en) 1995-06-26 1995-06-26 Three-level coding method for read only memory and device thereof

Publications (1)

Publication Number Publication Date
TW265473B true TW265473B (en) 1995-12-11

Family

ID=51402145

Family Applications (1)

Application Number Title Priority Date Filing Date
TW84106545A TW265473B (en) 1995-06-26 1995-06-26 Three-level coding method for read only memory and device thereof

Country Status (1)

Country Link
TW (1) TW265473B (en)

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