WO2005048270A1 - Integrierte schaltung, testsystem und verfahren zum auslesen eines fehlerdatums aus der integrierten schaltung - Google Patents
Integrierte schaltung, testsystem und verfahren zum auslesen eines fehlerdatums aus der integrierten schaltung Download PDFInfo
- Publication number
- WO2005048270A1 WO2005048270A1 PCT/EP2004/011687 EP2004011687W WO2005048270A1 WO 2005048270 A1 WO2005048270 A1 WO 2005048270A1 EP 2004011687 W EP2004011687 W EP 2004011687W WO 2005048270 A1 WO2005048270 A1 WO 2005048270A1
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- WO
- WIPO (PCT)
- Prior art keywords
- data
- integrated circuits
- integrated circuit
- circuit
- output
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C29/1201—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details comprising I/O circuitry
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C29/18—Address generation devices; Devices for accessing memories, e.g. details of addressing circuits
- G11C29/26—Accessing multiple arrays
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C29/18—Address generation devices; Devices for accessing memories, e.g. details of addressing circuits
- G11C29/26—Accessing multiple arrays
- G11C2029/2602—Concurrent test
Definitions
- the invention relates to an integrated circuit from which an error data is to be read out in accordance with a test mode.
- the invention further relates to a test system in which a plurality of integrated circuits are tested in parallel and fault data are to be read out from the integrated circuits.
- the invention further relates to a method for reading out fault data from integrated circuits.
- Integrated circuits are often tested in parallel by connecting the integrated circuits to a tester unit to form a test system. In a burn-in process in particular, the integrated circuits are tested simultaneously under extreme operating conditions in order to pre-age them.
- tester channels run in parallel are necessary in order to connect the address connections, command connections and above all the data connections of the integrated circuits to the tester unit. Especially with a large number of integrated circuits to be tested at the same time, there is therefore a need to use these tester channels as sparingly as possible. By saving tester channels, the number of integrated circuits to be tested can be increased further.
- the integrated circuits are organized in groups and banks and controlled in parallel at the same time in order to keep the effort for controlling the components on the part of the tester unit low. So essentially all integrated circuits are shared via common address and controlled mando lines. Since the data line to which the integrated circuits of a group are connected is also connected to the tester unit via a common data bus, special control signals are provided in order to successively send the data which must be read out from the integrated circuits of the group via the data bus read out the tester unit. This is done in such a way that only one bank can send data to the tester unit.
- the control signal is generally a circuit selection signal (CS: chip select signal) which is provided for activating or deactivating the respective integrated circuit.
- CS circuit selection signal
- tester channels are provided between each of the group's integrated circuits and the tester unit.
- An integrated circuit of several groups is arranged in banks, the integrated circuits of a bank being activated or deactivated by a circuit selection signal.
- an integrated circuit with a test circuit for reading out an error date from the integrated circuit is provided.
- the error date can be output via a first and a second data output of the integrated circuit.
- An address and a read command can be applied to the integrated circuit in order to read out the error date assigned to the address via one of the data outputs.
- the test circuit is designed to output the error date at the first data output when the first read command is applied and to switch the second data output to high resistance, and to output the error date at the second data output when the second read command is applied and to provide the first data output with high resistance turn.
- a test system for testing a number of such integrated circuits is provided.
- the integrated circuits are connected to a tester unit via common address and command lines in order to address memory areas for reading out fault data for parallel testing of the integrated circuits.
- the error date can be read out from a group of integrated circuits via a data line.
- the data output of a first integrated circuit of the group of integrated circuits is connected to the data line, and the second data output of a second integrated circuit of the group of integrated circuits is connected to the data line.
- the integrated circuit and the test system according to the invention make it possible to save a control line for driving the integrated circuit, with which the integrated circuit is otherwise selected for reading out the fault data.
- Integrated circuits are usually arranged in banks on a test board for parallel testing, with all integrated circuits of a bank being connected to the tester unit with separate data lines.
- a bank's integrated circuits can be activated or deactivated simultaneously with a circuit selection signal.
- Integrated circuits of a further bank are arranged essentially parallel to the bank and can likewise be activated via a separate circuit selection signal in order to read out the error data via the same data lines.
- the tester unit specifies which of the banks in the arrangement of the integrated circuits is currently selected in order to read out an error date of the integrated circuits via the respective data line. This requires circuit selection lines in a number that corresponds to the number of existing banks.
- the test system now provides for combining an integrated circuit from several banks to form a group of integrated circuits which are connected to the tester unit via the same data line. According to the invention, however, it is provided that when specifying the address from which the respective error date of the integrated circuit is to be read and when a read command is applied, the error data of all integrated circuits of the group is not simultaneously applied to the data line, but rather only the error date of one of the integrated ones Circuits of the group. If the read command is then reapplied, the error date is applied to the data line by another integrated circuit. The data line is controlled by a read command for each
- Readout process only connected to an active data output of the integrated circuits. After a number of read commands, which corresponds to the number of integrated circuits in the group, all error data of the integrated circuits in the group have thus been applied to the data line which are connected to the group of integrated circuits.
- the integrated circuits of the group of integrated circuits are connected to the data line in such a way that with each read command one of the integrated circuits outputs the error date on the data line. This ensures that not two integrated circuits output the respective error data on the same data line.
- the remaining data outputs of the integrated circuits, which are not currently outputting the error date to the data line, are switched to high impedance in order not to transmit the error date from the respective integrated circuit connected to the data line, which outputs the error date to the data line, to the tester unit to disturb.
- the integrated circuit preferably has a driver circuit for each data output.
- the driver circuit can each have a control input and a data input for applying the error data, in order to output the error data applied to the data input or to switch the data output to high impedance in accordance with a control signal applied to the control input, if the control input is completely separated from a potential or if a certain control signal level is applied.
- a suitable driver circuit for realizing such an integrated circuit according to the invention can be provided.
- An activation circuit can preferably be connected to the control inputs of the driver circuits in order to output the control signal in a test mode when the first read command is present, so that the error data is output to the first driver circuit and to completely separate the second data output from a potential. Furthermore, when the second read command is applied, the control signal is switched such that the error data is output to a second driver circuit while the first data output is switched to high resistance.
- the data outputs of one of the integrated circuits are switched cyclically so that the respective error date is always output on one of the data outputs, while the other data outputs are switched to high impedance.
- the multiple integrated circuits in the group of integrated circuits are connected to the data line in such a way that the respective error data to be output is present in succession on the data line.
- the Date of the first integrated circuit when the first read command is applied to the data line is applied to the data line.
- the error date of the second integrated circuit is correspondingly on the data line.
- An activation circuit is preferably provided which, in a normal operating mode, forwards the data present at the respective data input to the data output via the driver circuit.
- the integrated circuits can be connected to a test board which is connected to the tester unit via the address, command and data lines.
- the integrated circuits can also be arranged on an uncut sawn wafer, which can be contacted via a full wafer contacting device and are connected to the tester unit via the address, command and data lines.
- a method for reading out fault data from integrated circuits to be tested together is provided in a test system according to the invention.
- an address and a read command are first applied to the integrated circuits in order to read out the error date assigned to the address.
- a first and a second read command are applied to the integrated circuits in succession, so that the error date of the first integrated circuit of the group of integrated circuits can be read out on the data line when the first read command is present.
- the second read command is present, the error data is read out from the second integrated circuit of the group of integrated circuits.
- the method according to the invention has the advantage that the respective circuit selection signals for activating and deactivating the integrated circuits of a group can be saved.
- Preferred embodiments of the invention are explained in more detail below with reference to the accompanying drawings. Show it:
- FIG. 1 shows a test system for testing a plurality of integrated circuits according to the prior art
- FIG. 2 shows a test system according to a preferred embodiment of the invention
- FIG. 3 shows a test circuit in an integrated circuit according to a preferred embodiment of the invention
- FIG. 4 shows the control of the driver circuits according to a preferred embodiment of the invention
- FIG. 1 A test system according to the prior art is shown in FIG.
- the test system is used to test a number of integrated circuits 1 for errors at the same time, if possible.
- the integrated circuits 1 are connected to a tester unit 2, so that the addresses provided by the tester unit 2 via address lines 3 are made available to all connected integrated circuits and test commands provided by the tester unit 2 via corresponding command lines 4 to all integrated circuits 1.
- FIG. 1 shows an example of a test system with 16 integrated circuits 1 that are to be tested by the tester unit 2. It can be seen that each of the integrated circuits 1 are connected in parallel to the same address and command lines 3, 4.
- the integrated circuits 1 are organized in banks Bank0-Bank3 and groups G0-G3, each bank having four integrated circuits 1 in the example shown and each group likewise having four integrated circuits.
- the integrated circuits 1 of a group G0-G3 are shown arranged one below the other, a data output DQ of the integrated circuits 1 of a group being connected to the tester unit 2 via a common data line DO.
- each integrated circuit 1 of the group has four data outputs DQO, DQ1, DQ2, DQ3, of which only one is used to output error data.
- Each group G0-G3 of the integrated circuits 1 is connected to the tester unit 2 via the data line DO.
- the data line DO is connected to the first data outputs DQO of the integrated circuits in this way.
- the individual integrated circuits 1 of group G0-G3 are activated by a respective circuit selection signal CS1 to CS4 so that not all integrated circuits 1 of a group G0-G3 create the error date on data line DO during the test process when reading out an error date and thus cause a data conflict ,
- This circuit selection signal CS1-CS4 is made available either directly or in coded form by the tester unit 2, only one of the circuit selection signals CS1 to CS4 being activated and the other circuit selection signals CS1-CS4 being deactivated. If a circuit selection signal CS1-CS4 is activated, the respective integrated circuit 1 can address the address as well as the address
- the fact that only one of the circuit selection signals CS1-CS4 is activated at a time prevents a plurality of integrated circuits 1 from simultaneously trying to output an error date via the data line DO.
- the parallelism when testing the integrated circuits 1 is increased by arranging several groups G0-G3 in parallel, each group having its own data line DO. In each group, the integrated circuits 1 are organized in essentially the same way, so that every first integrated circuit device 1 of a group with the first circuit selection signal CS1, every second integrated circuit of a group with the second circuit selection signal CS2 etc. can be activated.
- the integrated circuits 1 can be both in the unsawed state on a wafer which is contacted with a full wafer contacting device or on a test board which receives the integrated circuits with the aid of base contacts and contacts them in this way.
- FIG. 2 shows an inventive test system according to a first embodiment of the invention.
- a test system is shown in which 16 integrated circuits 10, in particular memory circuits, are to be tested simultaneously. This example is not intended to limit the number of integrated circuits 10 in the test system to 16.
- the test system according to the invention has integrated circuits 10 which are to be tested with the aid of a tester unit 11. Each of the integrated circuits 10 is connected to the tester unit 11 via corresponding address and command lines 3, 4, so that an address created by the tester unit 11 and a test command created by the tester unit 11 is applied to all integrated circuits.
- Each of the integrated circuits 10 has data outputs DQO to DQ3, which are each connected to the data line DO of each group.
- the first data output DQO of the first integrated circuit of the group, the second data output DQ1 of the second integrated circuit, the third data output DQ2 of the third integrated circuit and the fourth data output DQ3 of the first integrated circuit are each connected to the data line DO.
- the integrated circuits 10 are switched in such a way that their circuit selection inputs CS are permanently activated, that the integrated circuits 10 are activated in order to receive addresses and test commands. If an address is applied to the integrated circuits and a read command for reading out error data is applied, the integrated circuits 10 output the error data at their first data outputs DQO.
- the error date of the first integrated circuit is created in a group on the data line DO. Because the other data outputs, namely the data outputs DQ1, DQ2 and DQ3 of all integrated circuits in the group are switched to high impedance, the fault data applied to the data line is not impaired by any further data signals applied to the data line. Only when the read command is reapplied to the integrated circuits, e.g. B. according to a clock signal, the first data outputs DQO of the integrated circuits are switched to high resistance and the respective error data of the integrated circuits of the group are applied to the second data output DQ1. The other data outputs are switched to high impedance. In this way, the error date of the first, second, third and fourth integrated circuits of the group can be read out in succession in the example shown by applying the read command four times.
- the tester unit receives the error data of the integrated circuits in series and can assign the error data received in this way to the respective integrated circuit 10.
- FIG. 3 shows a section of an integrated circuit 10 according to the invention.
- the integrated circuit 10 has driver circuits 20 which drive the data to the data outputs DQO to DQ3.
- a switching device 21 is switched such that f instead of a regular data signal, which can be output via the data outputs DQ0-DQ1 during normal operation, an error date via data lines 22 to the driver circuits 20 Is made available.
- the error date is provided by a test unit 23 which, depending on the address present, the error ler jewe be determined by comparing data written and read into a memory.
- an activation circuit 24 is also activated, which is in the form of a shift register. The activation circuit 24 is. activated when the test mode indicated by the test signal has been entered.
- the fact that error data are to be read out is indicated by means of a read command signal LS, which is also made available to the activation circuit 24.
- the activation circuit 24 has registers 25 connected to a shift register, the outputs of which are connected to the driver circuits 20. Depending on the content of the registers 25, this driver circuit 20 is switched in such a way that the data signal present on the respective data line 22 is passed on to the respective data output DQO to DQ3 or that the respective data output DQO to DQ3 is switched to high impedance. For example, it can be provided that if a logical “1” is stored in the respective register 25, the driver circuit 20 forwards the pending data to the data output DQO to DQ3 and switches the respective data output DQO to DQ3 with a high resistance when the logical “0” is used.
- the registers 25 can also be designed in such a way that they output a logical “ ⁇ ” in the activating state and are switched to high resistance in the non-activating state.
- the driver circuits 20 are then designed such that they connect the data output DQO to DQ3 to the corresponding registers 25 as soon as they are switched to high resistance.
- the first register (viewed from above) is switched active, so that the error date is switched through to the first driver circuit 20 (viewed from above), so that the error date is applied to the first data output DQO.
- the remaining driver circuits 20 are switched such that the second, third and fourth data outputs DQ1, DQ2, DQ3 are switched to high impedance.
- the Applying the next read command generates a further read command signal LS, so that the first register 25 is now deactivated again and the subsequent second register 25 is activated. This means that the corresponding second bit of the error data is now applied to the second data output DQ1, while the other data outputs DQO, DQ2, DQ3 are switched to high impedance.
- FIG. 4 shows how, depending on the read command present, each of the data outputs is switched in succession in such a way that the corresponding bit of the error data to be read is present.
- a logical “1” switches the respective driver circuit in such a way that the bit of the error date is switched through, a logical “0 ⁇ causes the driver circuit 20 in question to be switched to high resistance.
- the read command is issued by the tester unit, i.e. H. from external, specified.
- a total of as many read commands per address are generated as correspond to the number of integrated circuits.
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- Tests Of Electronic Circuits (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006536016A JP2007514254A (ja) | 2003-10-29 | 2004-10-16 | 集積回路、試験システム、および、集積回路からエラーデータを読み出すための方法 |
US11/415,443 US7434125B2 (en) | 2003-10-29 | 2006-05-01 | Integrated circuit, test system and method for reading out an error datum from the integrated circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10350356.0 | 2003-10-29 | ||
DE10350356A DE10350356B3 (de) | 2003-10-29 | 2003-10-29 | Integrierte Schaltung, Testsystem und Verfahren zum Auslesen eines Fehlerdatums aus der integrierten Schaltung |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/415,443 Continuation US7434125B2 (en) | 2003-10-29 | 2006-05-01 | Integrated circuit, test system and method for reading out an error datum from the integrated circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005048270A1 true WO2005048270A1 (de) | 2005-05-26 |
Family
ID=34072108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/011687 WO2005048270A1 (de) | 2003-10-29 | 2004-10-16 | Integrierte schaltung, testsystem und verfahren zum auslesen eines fehlerdatums aus der integrierten schaltung |
Country Status (5)
Country | Link |
---|---|
US (1) | US7434125B2 (de) |
JP (1) | JP2007514254A (de) |
KR (1) | KR100868119B1 (de) |
DE (1) | DE10350356B3 (de) |
WO (1) | WO2005048270A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3901151B2 (ja) * | 2003-12-25 | 2007-04-04 | セイコーエプソン株式会社 | ドライバic並びにドライバic及び出力装置の検査方法 |
US7941098B2 (en) * | 2007-07-02 | 2011-05-10 | Suvolta, Inc. | Common data line signaling and method |
US8065570B1 (en) * | 2008-01-28 | 2011-11-22 | Xilinx, Inc. | Testing an integrated circuit having configurable input/output terminals |
KR20120121225A (ko) | 2011-04-26 | 2012-11-05 | 에스케이하이닉스 주식회사 | 반도체 칩을 멀티테스트하기 위한 장치 및 방법 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0416714A2 (de) * | 1985-07-12 | 1991-03-13 | Anamartic Limited | In Plättchenform integrierte Speicherschaltungen |
US6026038A (en) * | 1996-09-23 | 2000-02-15 | Samsung Electronics Co., Ltd. | Wafer burn-in test circuit and method for testing a semiconductor memory |
US6424576B1 (en) * | 2001-03-08 | 2002-07-23 | Micron Technology, Inc. | Apparatus and methods for selectively disabling outputs in integrated circuit devices |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5794175A (en) * | 1997-09-09 | 1998-08-11 | Teradyne, Inc. | Low cost, highly parallel memory tester |
US6543015B1 (en) * | 1999-06-21 | 2003-04-01 | Etron Technology, Inc. | Efficient data compression circuit for memory testing |
ITRM20010104A1 (it) * | 2001-02-27 | 2002-08-27 | Micron Technology Inc | Modo di lettura a compressione di dati per il collaudo di memorie. |
US7055076B2 (en) * | 2002-08-28 | 2006-05-30 | Micron Technology, Inc. | Output data compression scheme using tri-state |
JP2005011464A (ja) * | 2003-06-20 | 2005-01-13 | Toshiba Corp | 半導体記憶装置、テストシステム及びテスト方法 |
-
2003
- 2003-10-29 DE DE10350356A patent/DE10350356B3/de not_active Expired - Fee Related
-
2004
- 2004-10-16 WO PCT/EP2004/011687 patent/WO2005048270A1/de active Application Filing
- 2004-10-16 JP JP2006536016A patent/JP2007514254A/ja active Pending
- 2004-10-16 KR KR1020067010480A patent/KR100868119B1/ko not_active IP Right Cessation
-
2006
- 2006-05-01 US US11/415,443 patent/US7434125B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0416714A2 (de) * | 1985-07-12 | 1991-03-13 | Anamartic Limited | In Plättchenform integrierte Speicherschaltungen |
US6026038A (en) * | 1996-09-23 | 2000-02-15 | Samsung Electronics Co., Ltd. | Wafer burn-in test circuit and method for testing a semiconductor memory |
US6424576B1 (en) * | 2001-03-08 | 2002-07-23 | Micron Technology, Inc. | Apparatus and methods for selectively disabling outputs in integrated circuit devices |
Also Published As
Publication number | Publication date |
---|---|
DE10350356B3 (de) | 2005-02-17 |
KR20060092276A (ko) | 2006-08-22 |
JP2007514254A (ja) | 2007-05-31 |
US7434125B2 (en) | 2008-10-07 |
KR100868119B1 (ko) | 2008-11-10 |
US20060262614A1 (en) | 2006-11-23 |
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