WO2003026175A2 - Übertragung grosser datenmengen über asynchrone schnittstellen in schaltungen mit master-checker-redundanzkonzept - Google Patents
Übertragung grosser datenmengen über asynchrone schnittstellen in schaltungen mit master-checker-redundanzkonzept Download PDFInfo
- Publication number
- WO2003026175A2 WO2003026175A2 PCT/DE2002/003155 DE0203155W WO03026175A2 WO 2003026175 A2 WO2003026175 A2 WO 2003026175A2 DE 0203155 W DE0203155 W DE 0203155W WO 03026175 A2 WO03026175 A2 WO 03026175A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- checker
- transmission
- master
- interface
- Prior art date
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
- G06F11/1675—Temporal synchronisation or re-synchronisation of redundant processing components
- G06F11/1679—Temporal synchronisation or re-synchronisation of redundant processing components at clock signal level
Definitions
- the subject of the application relates to a method for transmitting data via an asynchronous interface in a circuit arrangement with master-checker redundancy.
- High availability is an essential feature of technical systems such as B. Telecommunications switching systems. To ensure this, faults in parts of these systems must be recognized and localized as quickly as possible so that the faulty units can be switched off.
- a concept for fault localization in the hardware relies on the duplication according to the master / checker principle. The complete circuit unit is duplicated and processes all input information in parallel at the exact same time. All data that leave this unit are compared between the master and the checker. If there are any inequalities, the unit is decommissioned and subjected to an error diagnosis.
- Interfaces can be passed on, intermediate storage is necessary and the data flow may even have to be slowed down.
- the transmission of wide data buses via asynchronous interfaces can e.g. controlled by a qualifier signal.
- the data is transferred from the data bus into a register, where it is kept stable for several (3 - 4) cycles, so that it can be safely transferred to the other clock domain.
- the qualifier signal becomes active. After clocking twice, this signal in the receiver clock domain indicates that the data can now be transferred in full width to the other clock domain. This procedure assumes that the data rate on the bus is not greater than the transmission capacity of the interface.
- Data and qualifier signal are only taken from the master, the qualifier signal is clocked and distributed to the master and checker. This controls the transfer of the master data into the master and checker. Part of the redundancy is of course lost in this way, since the duplication principle is temporarily abandoned. This can be partially offset by additional measures: at the transition to the non-duplicated transmission path, errors that have occurred up to that point can be detected by comparing the master and checker data; on the non-duplicated transmission path, the data can be backed up, for example, using parity.
- the object of the registration is based on the problem of specifying a transmission of large amounts of data via an asynchronous interface while largely maintaining the master / checker redundancy.
- the subject of registration enables high-performance transfer of large amounts of data via asynchronous interfaces while largely maintaining the master / checker redundancy.
- FIG. 1 shows a parallel data transmission 1 via an asynchronous interface in a circuit based on the master / checker redundancy principle
- FIG. 2 shows a timing diagram of the cycle-oriented transmission via an asynchronous interface.
- cycle-oriented transmission The concept on which the subject of the application is based may be referred to as cycle-oriented transmission.
- the data to be transmitted arrive at the interface as discrete portions, not as a continuous data stream.
- the start and end of a portion of data to be transferred are clearly defined.
- the data portions to be transmitted can be classified, ie assigned to specific cycle types and / or formats (cells, packets). Each of these cycles runs in a fixed clock pattern.
- the number of cycle types / formats is finite. In principle, different types of transmission cycles run independently of one another in parallel. Examples of this are processor write or read cycles with address, control signals and possibly write data in a fixed clock pattern; Packet formats such as ATM cells, IP packets; or a format of your choice for the parallel transmission of status information etc. in one or more successive cycles.
- the data is transferred from one clock domain to the other via one or more data buses of any width, each separately from master to master and from checker to checker. There is no restriction of redundancy.
- the start and end of the transmission of a data portion are fixed and the process takes place in a fixed clock pattern.
- the FSM in the issuing clock domain signals the start and type of the transmission cycle, the further sequence follows a predetermined scheme in both FSMs.
- Master and Checker provide the first data to be transmitted in the same cycle (clock domain A) on the asynchronous interface.
- the Sync control FSML in the master and checker indicate the start of the transmission cycle with the same cycle (signal cycle_start).
- the data is' kept stable for so long, could be transferred to the receiving clock domain (Sync control FSM2, clock domain B) to lock it.
- the asynchronous interface is located within a block, 3 to 4 cycles are sufficient, otherwise longer times are required depending on the cable lengths.
- the signal cycle_start is the only point at which the master / checker redundancy concept must be left. Only the master signal is synchronized by multiple clocking in the receiving clock domain (Synchronization B - clock domain B) and starts as sync_cycle_start, then again clock-synchronously in the master and checker, the Sync control FSM2 for data transfer in clock domain B. Before the synchronization of the master Signal, the duplicate cycle_start signals from master and checker are compared. The timing is shown schematically in FIG. 2 as a timing diagram.
- the FSM can also control the parallel transfer of data on several data buses.
- FIG. 1 shows the processing of write cycles in a system with 2 microprocessors in master / checker redundancy in clock domain A on a storage unit in clock domain B.
- the latter is supplied with its own clock, since it is shared by several processors.
- There are differences in the assignment of the 32-bit data bus: with write cycles, write data can be placed on the data bus in several successive cycles (e.g. 4 cycles with write burst, cycles 2 - 5). Since this data cannot be transmitted via the asynchronous interface as it appears on the data bus, it is stored in the
- Data buffer & sync control FSM1 temporarily stored and, depending on the cycle type, transferred in parallel and / or sequentially to Sync control FSM2 via the various buses.
- the circuit can be designed so that when a burst write cycle is transmitted, even the last data word does not experience a greater overall delay than the 3-4 clock initial delay by which all data at the interface must be kept stable.
- Both FSM1 then generate the cycle_start signal isochronously, but independently of each other; the master signal is synchronized and starts the two FSM2 centrally.
- the FSM2 is informed of the cycle type decentrally in the first transmission cycle in the control bus. Now that the FSM2 mane started synchronously, they continue to work autonomously and take over data from their Partener FSMl in every cycle until the cycle is complete.
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Hardware Redundancy (AREA)
- Information Transfer Systems (AREA)
- Communication Control (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02776659A EP1421492A2 (de) | 2001-08-31 | 2002-08-28 | Übertragung grosser datenmengen über asynchrone schnittstellen in schaltungen mit master-checker-redundanzkonzept |
US10/488,321 US20040208202A1 (en) | 2001-08-31 | 2002-08-28 | Transmission of large volumes of data via asynchronous interfaces in circuits with redundancy concept of the checker-master type |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10142611 | 2001-08-31 | ||
DE10142611.9 | 2001-08-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003026175A2 true WO2003026175A2 (de) | 2003-03-27 |
WO2003026175A3 WO2003026175A3 (de) | 2003-07-03 |
Family
ID=7697193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/003155 WO2003026175A2 (de) | 2001-08-31 | 2002-08-28 | Übertragung grosser datenmengen über asynchrone schnittstellen in schaltungen mit master-checker-redundanzkonzept |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040208202A1 (de) |
EP (1) | EP1421492A2 (de) |
CN (1) | CN1549970A (de) |
WO (1) | WO2003026175A2 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0373523A2 (de) * | 1988-12-14 | 1990-06-20 | National Semiconductor Corporation | Verfahren und Schaltungen zur Synchronisierung von Signalen in einem fehlertoleranten Rechnersystem modularer Redundanz |
DE19536518A1 (de) * | 1995-09-29 | 1997-04-10 | Siemens Ag | Verfahren zur Aufrechterhaltung des mikrosynchronen Betriebs von gedoppelten informationsverarbeitenden Einheiten |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5434996A (en) * | 1993-12-28 | 1995-07-18 | Intel Corporation | Synchronous/asynchronous clock net with autosense |
US6327667B1 (en) * | 1995-05-12 | 2001-12-04 | Compaq Computer Corporation | Apparatus and method for operating clock sensitive devices in multiple timing domains |
US6687255B1 (en) * | 2000-03-21 | 2004-02-03 | Lsi Logic Corporation | Data communication circuit having FIFO buffer with frame-in-FIFO generator |
US6725388B1 (en) * | 2000-06-13 | 2004-04-20 | Intel Corporation | Method and system for performing link synchronization between two clock domains by inserting command signals into a data stream transmitted between the two clock domains |
US20020069375A1 (en) * | 2000-10-12 | 2002-06-06 | Matt Bowen | System, method, and article of manufacture for data transfer across clock domains |
US6738917B2 (en) * | 2001-01-03 | 2004-05-18 | Alliance Semiconductor Corporation | Low latency synchronization of asynchronous data |
US6842728B2 (en) * | 2001-03-12 | 2005-01-11 | International Business Machines Corporation | Time-multiplexing data between asynchronous clock domains within cycle simulation and emulation environments |
-
2002
- 2002-08-28 WO PCT/DE2002/003155 patent/WO2003026175A2/de not_active Application Discontinuation
- 2002-08-28 EP EP02776659A patent/EP1421492A2/de not_active Withdrawn
- 2002-08-28 US US10/488,321 patent/US20040208202A1/en not_active Abandoned
- 2002-08-28 CN CNA028170180A patent/CN1549970A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0373523A2 (de) * | 1988-12-14 | 1990-06-20 | National Semiconductor Corporation | Verfahren und Schaltungen zur Synchronisierung von Signalen in einem fehlertoleranten Rechnersystem modularer Redundanz |
DE19536518A1 (de) * | 1995-09-29 | 1997-04-10 | Siemens Ag | Verfahren zur Aufrechterhaltung des mikrosynchronen Betriebs von gedoppelten informationsverarbeitenden Einheiten |
Also Published As
Publication number | Publication date |
---|---|
US20040208202A1 (en) | 2004-10-21 |
EP1421492A2 (de) | 2004-05-26 |
CN1549970A (zh) | 2004-11-24 |
WO2003026175A3 (de) | 2003-07-03 |
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