GB1484331A - Computer system - Google Patents
Computer systemInfo
- Publication number
- GB1484331A GB1484331A GB46126/74A GB4612674A GB1484331A GB 1484331 A GB1484331 A GB 1484331A GB 46126/74 A GB46126/74 A GB 46126/74A GB 4612674 A GB4612674 A GB 4612674A GB 1484331 A GB1484331 A GB 1484331A
- Authority
- GB
- United Kingdom
- Prior art keywords
- computer
- reserve
- instruction
- data
- delay
- 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
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/1629—Error detection by comparing the output of redundant processing systems
- G06F11/1641—Error detection by comparing the output of redundant processing systems where the comparison is not performed by the redundant processing components
-
- 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
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/1629—Error detection by comparing the output of redundant processing systems
- G06F11/165—Error detection by comparing the output of redundant processing systems with continued operation after detection of the error
-
- 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
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/1695—Error detection or correction of the data by redundancy in hardware which are operating with time diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
- H04Q3/545—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised using a stored programme
- H04Q3/54541—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised using a stored programme using multi-processor systems
- H04Q3/54558—Redundancy, stand-by
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Hardware Redundancy (AREA)
- Multi Processors (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
1484331 Synchronizing computers TELEFONAKTIEBOLAGET L M ERICSSON 24 Oct 1974 [30 Oct 1973] 46126/74 Heading G4A A computer system comprises substantially identical executive and reserve computers E, R respectively, each computer comprising a number of functional units FU connected to one another via timing buses tb, order buses ob and data buses db, the reserve computer being able to work synchronously and in parallel with the executive computer by means of clock pulses from a clock pulse generator CG applied to the computers via start devices SDe, SDr respectively, data being transferred unidirectionally from the executive computer to update the reserve computer via a data transferring channel DCH which incorporates a time delay, the reserve computer being started subsequent to the start of the executive computer after a time delay substantially equal to the time delay of the data transferring channel. The data transferring channel is opened if necessary, to prevent transfer of faulty data within the reserve computer, by means of a signal ts, representing the "transfer state" of the system and stored in a control memory CM, operating AND gates G1, G2 connected to the data bus dbr of the reserve computer. In order to start the parallel synchronous working of the computers, an interrupt unit IU sends a signal to the executive computer, interrupting processing and selecting an instruction register which sends a "ready signal" to the interrupt unit, the ready signal producing via a decoder DEC a secondary start pulse ss which is applied to the start device SDe. Each start device SD comprises a first phase generator (shift register) PG1 stepped by clock pulses, and a second phase generator (cyclic counter) PG2 being four steps corresponding to the four phases of an instruction processing cycle. The secondary start pulse ss causes read-out of a start instruction from a register SIRe, the start instruction addressing a beginning instruction register BIR in the executive computer. The secondary start pulse ss passes to the start device SDr of the reserve computer via a delay device DE, and is further delayed a certain number of phases by a first phase generator PG1r having more stages than generator PG1e. In another embodiment (not shown) all the delay is obtained from the delay device DE, the generators PG1e, PGlr being identical. The second phase generator PG2r remains at zero until activated by a start pulse s from generator PG1r, and then reads out a start instruction from a register SIRr to select a beginning instruction register in the reserve computer. In Fig. 2 (not shown) each functional unit FU has a control memory CM recording its transfer state, allowing diagnosis of which functional unit in the reserve computer is faulty. In this embodiment the delay device DE is omitted, delay being obtained partly via a single first phase generator (shift register) (PG1) feeding the start devices SDe, SDr via different outputs, and partly by the start device SDr addressing so called "blind instruction registers" (BLR) in the reserve computer. Each blind instruction register contains an instruction to address another register, so that a delay of one processing cycle is obtained. A drift comparison device comprising an EXOR gate (EXORd) compares data on the data transferring channel DCH and on the data bus dbr of the reserve computer during those timing phases intended for reception of data by the reserve computer, and generates an alarm signal if these are unequal. This alarm signal is used in the above diagnosis. In Fig. 3 (not shown) the delay of the delay device is achieved via the data transferring channel DCH, in that a signal is sent from generator PG1e to the control memory CM of the channel DCH, which closes the channel and enables data and a start instruction to be transferred from the executive to the reserve computer. When the incoming start instruction from channel DCH is recognized to be the same as that stored in register SIRr, a comparison device (EXORs) sends a start signal to the first phase generator PGlr. The second phase generator PG2r is then started a certain number of phases (optimally adjustable) following this.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7314713A SE369345B (en) | 1973-10-30 | 1973-10-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1484331A true GB1484331A (en) | 1977-09-01 |
Family
ID=20318960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB46126/74A Expired GB1484331A (en) | 1973-10-30 | 1974-10-24 | Computer system |
Country Status (20)
Country | Link |
---|---|
JP (1) | JPS5826053B2 (en) |
BE (1) | BE821638A (en) |
BR (1) | BR7408994D0 (en) |
CA (1) | CA1026871A (en) |
CH (1) | CH593520A5 (en) |
CS (1) | CS216670B2 (en) |
DD (1) | DD115960A5 (en) |
DK (1) | DK143819C (en) |
ES (1) | ES431448A1 (en) |
FI (1) | FI56456C (en) |
FR (1) | FR2249388B1 (en) |
GB (1) | GB1484331A (en) |
HU (1) | HU170964B (en) |
IN (1) | IN141771B (en) |
IT (1) | IT1025327B (en) |
NL (1) | NL188871C (en) |
NO (1) | NO141282C (en) |
SE (1) | SE369345B (en) |
SU (1) | SU1068050A3 (en) |
YU (1) | YU36232B (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3416138A (en) * | 1965-08-25 | 1968-12-10 | Bell Telephone Labor Inc | Data processor and method for operation thereof |
DE2117128A1 (en) * | 1971-04-07 | 1972-10-19 | Siemens Ag | Method for switching system units on and off in a modular processing system |
FR2182259A5 (en) * | 1972-04-24 | 1973-12-07 | Cii |
-
1973
- 1973-10-30 SE SE7314713A patent/SE369345B/xx unknown
-
1974
- 1974-10-10 IN IN2272/CAL/74A patent/IN141771B/en unknown
- 1974-10-14 FI FI2991/74A patent/FI56456C/en active
- 1974-10-23 NL NLAANVRAGE7413875,A patent/NL188871C/en not_active IP Right Cessation
- 1974-10-24 GB GB46126/74A patent/GB1484331A/en not_active Expired
- 1974-10-28 YU YU2871/74A patent/YU36232B/en unknown
- 1974-10-28 DD DD181961A patent/DD115960A5/xx unknown
- 1974-10-28 FR FR7435993A patent/FR2249388B1/fr not_active Expired
- 1974-10-29 BR BR8994/74A patent/BR7408994D0/en unknown
- 1974-10-29 SU SU742073064A patent/SU1068050A3/en active
- 1974-10-29 CA CA212,572A patent/CA1026871A/en not_active Expired
- 1974-10-29 CH CH1450174A patent/CH593520A5/xx not_active IP Right Cessation
- 1974-10-29 ES ES431448A patent/ES431448A1/en not_active Expired
- 1974-10-29 BE BE150019A patent/BE821638A/en not_active IP Right Cessation
- 1974-10-29 HU HU74EI00000571A patent/HU170964B/en unknown
- 1974-10-29 NO NO743886A patent/NO141282C/en unknown
- 1974-10-29 DK DK563174A patent/DK143819C/en not_active IP Right Cessation
- 1974-10-29 JP JP49124827A patent/JPS5826053B2/en not_active Expired
- 1974-10-30 IT IT28970/74A patent/IT1025327B/en active
- 1974-10-30 CS CS747410A patent/CS216670B2/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR2249388A1 (en) | 1975-05-23 |
NO743886L (en) | 1975-05-26 |
JPS5075751A (en) | 1975-06-21 |
FI56456C (en) | 1980-01-10 |
NO141282B (en) | 1979-10-29 |
NL7413875A (en) | 1975-05-02 |
YU287174A (en) | 1981-04-30 |
YU36232B (en) | 1982-02-25 |
JPS5826053B2 (en) | 1983-05-31 |
SU1068050A3 (en) | 1984-01-15 |
CA1026871A (en) | 1978-02-21 |
BE821638A (en) | 1975-02-17 |
IN141771B (en) | 1977-04-16 |
FR2249388B1 (en) | 1978-08-11 |
FI56456B (en) | 1979-09-28 |
NL188871C (en) | 1992-10-16 |
SE369345B (en) | 1974-08-19 |
DK563174A (en) | 1975-06-30 |
CS216670B2 (en) | 1982-11-26 |
NO141282C (en) | 1980-02-06 |
AU7453074A (en) | 1976-04-29 |
DK143819B (en) | 1981-10-12 |
HU170964B (en) | 1977-10-28 |
ES431448A1 (en) | 1976-09-01 |
NL188871B (en) | 1992-05-18 |
DD115960A5 (en) | 1975-10-20 |
FI299174A (en) | 1975-05-01 |
CH593520A5 (en) | 1977-12-15 |
DK143819C (en) | 1982-03-29 |
IT1025327B (en) | 1978-08-10 |
BR7408994D0 (en) | 1975-08-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6260154B1 (en) | Apparatus for aligning clock and data signals received from a RAM | |
US4523274A (en) | Data processing system with processors having different processing speeds sharing a common bus | |
US6330683B1 (en) | Method for aligning clock and data signals received from a RAM | |
US4503490A (en) | Distributed timing system | |
US4386401A (en) | High speed processing restarting apparatus | |
GB2074762A (en) | Multi-processor systems | |
JPH04257932A (en) | Chip for emulation for digital signal processor | |
GB1487953A (en) | Asynchronous communications bus | |
US4158883A (en) | Refresh control system | |
US5301306A (en) | Circuit for slowing portion of microprocessor operating cycle in all successive operating cycles regardless of whether a slow device is accessed in the portion of any operating cycle | |
JPH0550775B2 (en) | ||
US5079694A (en) | Data processing apparatus having a working memory area | |
GB1484331A (en) | Computer system | |
KR940004461A (en) | Data transmission device and multiprocessor system | |
GB1343243A (en) | Data processing system | |
US4244028A (en) | Digital microprocessor having a time-shared adder | |
GB960862A (en) | Improvements in signal detecting devices | |
JPS61114362A (en) | Access control system for share memory | |
SU613402A1 (en) | Storage | |
EP1122736B1 (en) | ATD generation in a synchronous memory | |
SU1251075A1 (en) | Device for unpacking instructions | |
SU1660147A1 (en) | Pseudorandom sequence generator | |
KR100326175B1 (en) | Variable address appointing circuit of synchronous transfer device and method thereof | |
SU930274A1 (en) | Device for programme-control of actuators | |
SU1024927A1 (en) | Microprogrammed processor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19941023 |