ES336127A1 - Parity checking system - Google Patents
Parity checking systemInfo
- Publication number
- ES336127A1 ES336127A1 ES336127A ES336127A ES336127A1 ES 336127 A1 ES336127 A1 ES 336127A1 ES 336127 A ES336127 A ES 336127A ES 336127 A ES336127 A ES 336127A ES 336127 A1 ES336127 A1 ES 336127A1
- Authority
- ES
- Spain
- Prior art keywords
- parity
- bit
- words
- word
- predetermined
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Detection And Correction Of Errors (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
In a parity checking system, predetermined test data is applied to a device to provide, if the device is operating correctly, output data of predetermined parity which is then combined with a fixed value parity bit and parity checked. In a computer (Fig. 1, not shown), a word (including parity bit) is odd parity checked (8) when read from a store (1), before use (without the parity bit) in an ALU, i.e. arithmetic and logic unit (3). The ALU output is reinserted into the store (1) together with a parity bit generated (7) for it, after a further parity check. To test the ALU etc., a diagnostic routine is initiated in which two test words are read from the store (1) and processed in the ALU, the words being chosen so that in the absence of error, the result has even parity. A pseudoparity bit, which is always " one ", is combined with it and a parity check (8) carried out. The computer can be parallel or serial. In a data transmission system (Fig. 2, not shown), a predetermined number of multi-bit parallel message words are transmitted in turn serially by bit, each word being staticized and provided (19) with a parity bit at the receiver. When the predetermined number of words have been received, a counter reverses a (relay or transistor) switch (20) to combine a pseudoparity bit, which is always " one ", with a predetermined word of even parity transmitted after the message words. A parity check is then carried out on this last (combined) word and if it does not have odd parity, an error has occurred. In this case, the transmitter is caused to send the predetermined word again and if this time the parity is correct, the message words are retransmitted. The system could alternatively be serial throughout.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB405666A GB1072835A (en) | 1966-01-29 | 1966-01-29 | Parity checking system |
Publications (1)
Publication Number | Publication Date |
---|---|
ES336127A1 true ES336127A1 (en) | 1968-01-01 |
Family
ID=9769896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES336127A Expired ES336127A1 (en) | 1966-01-29 | 1967-01-27 | Parity checking system |
Country Status (8)
Country | Link |
---|---|
AT (1) | AT270267B (en) |
BE (1) | BE692972A (en) |
CH (1) | CH451567A (en) |
ES (1) | ES336127A1 (en) |
FR (1) | FR1508679A (en) |
GB (1) | GB1072835A (en) |
NL (1) | NL6701290A (en) |
SE (1) | SE322363B (en) |
-
1966
- 1966-01-29 GB GB405666A patent/GB1072835A/en not_active Expired
-
1967
- 1967-01-16 FR FR8312A patent/FR1508679A/en not_active Expired
- 1967-01-20 BE BE692972D patent/BE692972A/xx unknown
- 1967-01-25 AT AT73467A patent/AT270267B/en active
- 1967-01-26 SE SE113567A patent/SE322363B/xx unknown
- 1967-01-27 ES ES336127A patent/ES336127A1/en not_active Expired
- 1967-01-27 CH CH128267A patent/CH451567A/en unknown
- 1967-01-27 NL NL6701290A patent/NL6701290A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
FR1508679A (en) | 1968-01-05 |
GB1072835A (en) | 1967-06-21 |
SE322363B (en) | 1970-04-06 |
NL6701290A (en) | 1967-07-31 |
AT270267B (en) | 1969-04-25 |
DE1549459A1 (en) | 1971-02-04 |
BE692972A (en) | 1967-07-03 |
DE1549459B2 (en) | 1972-12-07 |
CH451567A (en) | 1968-05-15 |
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