CN207833931U - Memory device and test circuit for it - Google Patents

Abstract

The utility model at least provides a kind of memory device, wherein address latch can select enable signal output block selection control signal according to block；Test pattern selecting unit can export test mode select signal according to test pattern selection instruction signal；Block selecting unit exports block selection signal according to mode select signal and block selection enable signal；When enabling the first memory module according to block selection signal, the first memory module exports the first inputoutput data；When enabling the second memory module according to block selection signal, the second memory module exports the second inputoutput data；When memory enters the first test pattern according to test mode select signal, part input/output port is placed in disabled status by output state, and the input/output port that the first inputoutput data and the second inputoutput data successively never disable is exported.The memory device of the utility model can reduce the input/output port of engaged test board.

Description

Memory device and test circuit for it

Technical field

The utility model is related to field of semiconductor memory more particularly to a kind of memory device and it is used for memory device Test circuit.

Background technology

Semiconductor memory (Semi-Conductor Memory) is a kind of depositing using semiconductor circuit as storage media Reservoir is made of semiconductor integrated circuit.Fig. 1 shows the circuit diagram of 16 bit memory devices 100, memory device 100 include two 8 memory modules 141 and 142, and memory device 100 further includes Command Logic Unit 170 and address latch 110, Command Logic Unit 170 exports internal control signal, address lock under the control of external signal OE, RAS/, CAS/ and WE/ 130 latch address signals ADD [0 of storage：13], and row address signal ROW [0 is exported:13] and column address signal COL [0:9] extremely Memory module 141 and 142, memory module 141 and 142 is by row address signal ROW [0:13] and column address signal COL [0:9] it translates Code and output data, output state 151 export the data buffer storage of memory module 141, and output state 152 is by memory module 142 data buffer storage output.

Fig. 2 shows memory device test circuit schematic diagrames commonly used in the prior art, and multiple memory under test are filled It sets 100 (DUT ' 1, DUT ' 2, DUT ' 3, DUT ' 4, DUT ' 5, DUT ' 6 ...) to connect with tester table 10, wherein the 1st storage The ports OE, the ports RAS/, the ports CAS/ and the ports WE/ of device device DUT ' 1 be required for 1 of engaged test board 10 respectively it is defeated Enter output port IO1 [0:, and address port A [0 3]:13] 14 input/output port IO1 of engaged test board 10 are needed [4:17], data port DQ [0:15] 16 input/output port IO1 [18 of engaged test board 10 are needed:13], each Memory device 100 is required for similar connection, when there is 6 memory devices, it is necessary to 201 of engaged test board 10 Input/output port, therefore, the test circuit of the prior art need multiple I/O ports of engaged test board, lead to test resource Waste and testing cost increase.

Utility model content

The utility model embodiment provides a kind of memory device and the test circuit for memory device, to solve Or alleviate one or more technical problems in the prior art.

As the one side of the utility model embodiment, the utility model embodiment provides a kind of memory device, packet It includes：

There is address latch address signal input terminal and block to select enable signal input terminal, be respectively used to receive address Signal and block select enable signal, described address latch output address to control signal and block selection control signal；

Test pattern selecting unit has test pattern selection instruction input terminal, for receiving test pattern selection instruction Signal, the test pattern selecting unit export test mode select signal according to the test pattern selection instruction signal；

Block selecting unit is connected to described address latch and the test pattern selecting unit, for according to described piece Selection control signal and the test mode select signal export block selection signal；

First memory module is connected to described piece of selecting unit and described address latch, believes when according to described piece of selection Number enable first memory module when, first memory module by described address control signal interpretation and export first input Output data；

Second memory module is connected to described piece of selecting unit and described address latch, believes when according to described piece of selection Number enable second memory module when, second memory module by described address control signal interpretation and export second input Output data；And

There is output state multiple input output port, the output state to be connected to the test pattern selection Unit, and it is connected to first memory module and second memory module, when the memory device is according to the test When mode select signal enters the first test pattern, part input/output port is placed in disabled status by the output state, And the input/output port that first inputoutput data and second inputoutput data successively never disable is exported.

Further, the memory device further includes：

Test pattern reads and writes logic unit, is connected between first memory module and the output state, and Between second memory module and the output state, and it is connected to described address latch and test pattern selection Unit, for according to described piece of selection control signal and the test mode select signal to first inputoutput data and Second inputoutput data carries out logical process, to obtain logical process result；

Wherein, described when the memory device enters the second test pattern according to the test mode select signal Part input/output port is placed in disabled status by output state, and the input that the logical process result is never disabled is defeated Exit port exports.

Further, second test pattern includes that the first test subpattern and second test subpattern,

When the memory device enters the first test subpattern according to the test mode select signal, the test Pattern read-write logic unit is for holding first inputoutput data and second inputoutput data with expected data The processing of row logic exclusive or, obtains the first logical process result；

When the memory device enters the second test subpattern according to the test mode select signal, the test Pattern reads and writes logic unit and is used to execute logic exclusive or to first inputoutput data and second inputoutput data Processing, obtains the second logical process result.

Further, the test pattern read-write logic unit includes：

Register, for exporting expected data；

First data comparator is connected to the register, first memory module and second memory module, For first inputoutput data and second inputoutput data to be executed with the expected data at logic exclusive or Reason, obtains the first logical process result；

Second data comparator is connected to first memory module and second memory module, and being used for will be described First inputoutput data executes logic exclusive or with second inputoutput data, obtains the second logical process result； And

The input terminal of multiple selector, the multiple selector is connected to first data comparator, second number According to comparator and the test pattern selecting unit, the output end of the multiple selector is connected to the output state, The multiple selector under the control of the test mode select signal for exporting the first logical process result and institute State any one of the second logical process result.

Further, the output state includes：

First buffer group, including multiple first buffers, the input terminal of first buffer are connected to described first The output end of memory module, multiple first buffers forms first group of input/output port, wherein first buffer Output end be placed in non-disabled status；

Second buffer group, including multiple second buffers, the input terminal of second buffer are connected to described first The output end of memory module, multiple second buffers forms second group of input/output port, wherein second buffer Output end disabled status is placed according to the test mode select signal；And

Third buffer group, including multiple third buffers, the input terminal of the third buffer are connected to described second The output end of memory module, multiple third buffers forms third group input/output port, wherein the third buffer Output end disabled status is placed according to the test mode select signal.

Further, the test pattern selection instruction signal includes initial testing mode signal, fuse signal and test Mode control signal, the initial testing mode signal come from the internal circuit of the memory device, the test pattern Control signal comes from external test signal, and the enabled priority of the test pattern control signal is believed higher than the fuse Number, the enabled priority of the fuse signal is higher than the initial testing mode signal.

Further, the test pattern selecting unit includes at least one test pattern selection subelement, the test Model selection subelement includes：

Fuse circuit, for exporting the fuse signal and fuse enable signal according to fuse state；

First multiple selector has first input end and the second input terminal, is respectively used to input the initial testing mould Formula signal and the fuse signal, first multiple selector are used under the control of the fuse enable signal, export institute State any one of fuse signal and the initial testing mode signal；

Test pattern control unit, for exporting the test pattern control signal and test pattern enable signal；And

Second multiple selector is connected to first multiple selector and the test pattern control unit, is used for Under the control of the test pattern enable signal, by the output of the test pattern control signal and first multiple selector Any one of signal is exported as the test mode select signal.

Further, when the memory device enters third test pattern according to the test mode select signal, The output state will fully enter output port and be placed in non-disabled status, and by first inputoutput data and described Second inputoutput data fully enters output port output from described.

Further, the test mode select signal includes that the first test mode select signal and the second test pattern select Signal is selected, described piece of selecting unit includes：

Logical AND gate is connected to the test pattern selecting unit, is used for first test mode select signal Inversion signal exports after carrying out logical AND with second test mode select signal；

First logic NAND gate, is connected to described address latch and the logical AND gate, for controlling described piece of selection The output of signal processed and the logical AND gate carries out logical AND non-post and exports first block selection signal；And

Second logic NAND gate, is connected to described address latch and the logical AND gate, for controlling described piece of selection The output of signal and logical AND gate processed carries out logical AND non-post and exports second block selection signal.

As the other side of the utility model embodiment, the utility model embodiment also provides a kind of for memory The test circuit of device, including multiple above-described memory devices and the part input and output with the memory device The tester table of port connection.

Further, the tester table includes block selection enable signal output end, enabled for exporting described piece of selection Described piece of selection enable signal input terminal of signal, multiple memory devices is joined together to form the first tie point, institute State the described piece of selection enable signal output end that the first tie point is connected to the tester table.

Further, the memory device have rwo address strobe signals port, column address gating signal port, write it is fair Perhaps the rwo address strobe signals port of signal port, multiple memory devices is joined together to form the second connection The column address gating signal port of point, multiple memory devices is joined together to form third tie point, Duo Gesuo The written allowance signal port for stating memory device is joined together to form the 4th tie point, second tie point, described Third tie point and the 4th tie point are connected to an input/output port of the tester table.

The utility model embodiment uses above-mentioned technical proposal, and test can be shared when testing memory device The driving resource of board reduces the input/output port of engaged test board.

Above-mentioned general introduction is merely to illustrate that the purpose of book, it is not intended to be limited in any way.Except foregoing description Schematical aspect, except embodiment and feature, by reference to attached drawing and the following detailed description, the utility model is into one Aspect, embodiment and the feature of step, which will be, to be readily apparent that.

Description of the drawings

In the accompanying drawings, unless specified otherwise herein, otherwise run through the identical reference numeral of multiple attached drawings and indicate same or analogous Component or element.What these attached drawings were not necessarily to scale.It should be understood that these attached drawings are depicted only according to this practicality Some novel disclosed embodiments, and should not be taken as the limitation to the scope of the utility model.

Fig. 1 is the circuit diagram of memory device in the prior art.

Fig. 2 is the test circuit figure for memory device in the prior art.

Fig. 3 is the circuit diagram for the memory device that the utility model is implemented.

Fig. 4 is the circuit diagram of the test pattern selecting unit of the memory device of the utility model embodiment.

Fig. 5 is the circuit diagram of the output state of the memory device of the utility model embodiment.

Fig. 6 is the circuit diagram of the TMRW logic units of the memory device of the utility model embodiment.

Fig. 7 is the circuit diagram of the block selecting unit of the memory device of the utility model embodiment.

Fig. 8 is the test circuit figure of the memory device for the utility model embodiment.

Reference sign：

The prior art：

100：Memory device； 110：Address latch； 141：First memory module；

142：Second memory module； 151、152：Output state；

170：Command Logic Unit； 10：Tester table.

The utility model：

200：Memory device；

210：Address latch； 220：Test pattern selecting unit；

230：Block selecting unit； 241：First memory module；

242：Second memory module； 250：Output state；

260：TMRW logic units； 270：Command Logic Unit；

221：First test pattern selects subelement； 222：Second test pattern selects subelement；

221A：First fuse circuit； 222A：Second fuse circuit；

221C：First test pattern selects control unit； 222C：Second test pattern selects control unit；

221B：First multiple selector； 221D：Second multiple selector；

222B：Third multiple selector； 222D：4th multiple selector；

231：First logic NAND gate； 232：Second logic NAND gate； 233：4th logical AND gate；

251：First buffer group； 251A：First buffer； 252：Second buffer group；

252A：Second buffer； 253：Third buffer group； 253A：Third buffer；

254：Phase inverter； 255：Logic nor gate； 261：First data comparator；

262：Second data comparator； 263：Register； 264：5th multiple selector；

265：First logical AND gate； 266：Second logical AND gate； 267：Third logical AND gate；

20：Tester table.

Specific implementation mode

Hereinafter, certain exemplary embodiments are simply just described.As one skilled in the art will recognize that Like that, without departing from the spirit or scope of the present utility model, it can be changed by various different modes described real Apply example.Therefore, attached drawing and description are considered essentially illustrative rather than restrictive.

In the description of the present invention, it should be understood that term "center", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is based on ... shown in the drawings Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated dress It sets or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to the utility model Limitation.

In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more this feature.The meaning of " plurality " is two or two in the description of the present invention, More than, unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be Mechanical connection can also be electrical connection, can also be communication；It can be directly connected, the indirect phase of intermediary can also be passed through Even, can be the interaction relationship of the connection or two elements inside two elements.For those of ordinary skill in the art For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.

In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it "lower" may include that the first and second features are in direct contact, and can also not be to be in direct contact but lead to including the first and second features Cross the other characterisation contact between them.Moreover, fisrt feature second feature " on ", " side " and " above " include first Feature is right over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.Fisrt feature Second feature " under ", " lower section " and " below " include fisrt feature right over second feature and oblique upper, or only table Show that fisrt feature level height is less than second feature.

Following disclosure provides many different embodiments or example is used for realizing the different structure of the utility model. In order to simplify the disclosure of the utility model, hereinafter the component of specific examples and setting are described.Certainly, they are only Example, and purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals And/or reference letter, this repetition are for purposes of simplicity and clarity, itself not indicate discussed various embodiments And/or the relationship between setting.

The utility model embodiment provides a kind of memory device, and list is selected by increasing test pattern selecting unit and block Member, to realize the input/output port amount that can reduce engaged test board when testing memory device, and Different test patterns can be executed to memory device.

It is illustrated in figure 3 the memory device 200 of the present embodiment, including address latch 210, test pattern selecting unit 220, block selecting unit 230, the first memory module 241, the second memory module 242 and output state 250.

There is address latch 210 address signal input terminal A1 and block to select enable signal input terminal A2, address signal defeated Enter to hold A1 to receive address signal ADD [0:13], block selection enable signal input terminal A2 receives block and selects enable signal BLKA, address Latch 210 is according to address signal ADD [0:13] and block selection enable signal BLKA output block selection control signal BLKSEL and Address control signal, the address control signal include column address signal COL [0:9] and row address signal ROW [0:13].

Test pattern selecting unit 220 has test pattern selection instruction input terminal A3, the input of test pattern selection instruction A3 is held to receive test pattern selection instruction signal TM CMD BUS, wherein test pattern selecting unit 220 can be one or more Test pattern selects subelement, and each test pattern selection subelement will be according to test pattern selection instruction signal TM CMD BUS exports a test mode select signal, and test pattern selects the quantity of subelement to depend on required test pattern Quantity.

Following embodiment will select subelement to illustrate with two test patterns, i.e. test pattern selecting unit 220 include the first test pattern selection subelement 221 and the second test pattern selects subelement 222, the selection of the first test pattern Subelement 221 is used to export the first test mode select signal TM1 according to test pattern selection instruction signal TM CMD BUS, the Two test patterns select subelement 222 to be used to export the second test pattern according to test pattern selection instruction signal TM CMD BUS Selection signal TM2.

Test pattern selection instruction signal TM CMD BUS may include initial testing mode signal (the first initial testing mould Formula signal default1 and the second initial testing mode signal default2), fuse signal (the first fuse signal Fuse1 and Two fuse signal Fuse2), test pattern selection control signal (the first test pattern selection control signal TM CTRL1 and second Test pattern selection control signal TM CTRL2).Wherein, initial testing mode signal derives from the inside of memory device 200 Once manufacture, just acquiescence generates in memory device 200 for circuit design, i.e. initial testing mode signal, such as initial testing mode The internal operating voltages VDD that signal can derive from memory device 200 can also come to be arranged to high level signal Derived from the ground connection terminal voltage VSS of memory device 200, to be arranged to low level signal.

As shown in figure 4, the first test pattern selection subelement 221 includes the first fuse circuit 221A, the first multi-path choice Device 221B, the first test pattern select control unit 221C and the second multiple selector 221D.

First fuse circuit 221A exports the first fuse signal Fuse1 and the enabled letter of the first fuse according to the first fuse state Number Fuse enable1, the first fuse state include fuse failure and the level signal that changes or generate, wherein fuse is a kind of The structure of safeguard protection is carried out to the hardware interface of memory device 200, physically, is located at 200 place of memory device On chip.

First multiple selector 221B has first input end B1 and the second input terminal B2, first input end B1 are logic " 0 " is logical one for inputting the first initial testing mode signal default1, the second input terminal B2, molten for inputting first The gating signal end B3 of silk signal Fuse1, the first multiple selector 221B input the first fuse enable signal Fuse enable1, It is molten first for exporting the first fuse signal Fuse1 when the first fuse enable signal Fuse enable1 export logical one The first initial testing mode signal default1 is exported when silk enable signal Fuse enable1 output logical zeroes.That is, The enabled priority of first fuse signal Fuse1 is higher than the first initial testing mode signal default1.

First test pattern selects control unit 221C for exporting the first test pattern selection control signal TM CTRL1 Come from external testing letter with the first TM enable signals TM enable1, the first test pattern selection control signal TM CTRL1 Number, it can be set according to the testing requirement of user, that is to say, that the first test pattern selection control unit 221C may be disposed at outside Test circuit or external testing board.

Second multiple selector 221D is connected to the first multiple selector 221B and the first test pattern selection control unit 221C, specifically, the logical zero input terminal of the second multiple selector 221D are connected to the output of the first multiple selector 221B End, the logical one input terminal of the second multiple selector 221D are connected to the output of the first test pattern selection control unit 221C The gating signal end B4 at end, the second multiple selector 221D inputs the first TM enable signal TM enable1, in the first TM Select control signal TM CTRL1 as the first test the first test pattern when enable signal TM enable1 output logical ones Mode select signal TM1 outputs, when the first TM enable signal TM enable1 export logical zero by the first multiple selector The output signal of 221B is as the first test mode select signal TM1 outputs, that is, at the beginning of exporting the first fuse signal Fuse1 or first Beginning test mode signal default1.That is, the priority of the first test pattern selection control signal TM CTRL1 is higher than First fuse signal Fuse1.

With continued reference to Fig. 4, it includes the second fuse circuit 222A, the choosing of third multichannel that the second test pattern, which selects subelement 222, Select device 222B, the second test pattern selection control unit 222C and the 4th multiple selector 222D.

Second fuse circuit 222A exports the second fuse signal Fuse2 and the enabled letter of the second fuse according to the second fuse state Number Fuse enable2；Second multiple selector 222B has third input terminal B5 and the 4th input terminal B6, inputs second respectively Initial testing mode signal default2 and the second fuse signal Fuse2；Second test pattern selects control unit 222C outputs Second test pattern selection control signal TM CTRL2 and the 2nd TM enable signal TM enable2；4th multiple selector 222D It is connected to third multiple selector 222B and the second test pattern selection control unit 222C, in the 2nd TM enable signals TM Control signal TM CTRL2 are selected to select to believe as the second test pattern the second test pattern when enable2 exports logical one Number TM2 output believes the output of third multiple selector 222B when the 2nd TM enable signal TM enable2 export logical zero The TM2 outputs of number the second test mode select signal of conduct export the second fuse signal Fuse2 or the second initial testing mode letter Number default2.It is single that the concrete operating principle of second test pattern selection subelement 222 sees the first test pattern selection Member 221.

When memory device 200 will be endowed a test mould given tacit consent to once the manufacturing according to circuit design demand Formula, we can change the test pattern of memory device 200 according to fuse state is changed, when fuse state is immutable When more, control signal can be selected to change memory device 200 by the test pattern of external test circuitry or tester table Test pattern.

As shown in figure 3, block selecting unit 230 is connected to address latch 210 and test pattern selecting unit 220, it is used for Control signal BLKSEL, the first test mode select signal TM1 and the second test mode select signal TM2 outputs are selected according to block Block selection signal SELB, wherein block selection signal SELB includes the first block selection signal SELB1 and the second block selection signal SELB2。

Wherein, the first memory module 241 is connected to block selecting unit 230 and address latch 210, when the first memory module 241 under the control of the first block selection signal SELB1 when being enabled, and the first memory module 241 is by column address signal COL [0:9] With row address signal ROW [0:13] it decodes and exports the first inputoutput data IO [0:7].Second memory module 242 is connected to Block selecting unit 230 and address latch 210, when quilt under control of second memory module 252 in the second block selection signal SELB2 When enabled, the second memory module 242 is by column address signal COL [0:9] and row address signal ROW [0:13] it decodes and exports second Inputoutput data IO [8:15].

As shown in Figure 3 and Figure 5, output state 250 is connected to the first memory module 241, the second memory module 242 and surveys Mode selecting unit 220, including multiple input output port DQ are tried, first group of input/output port DQ [0 can be divided into:3], second Group input/output port DQ [4:7] and third group input/output port DQ [8:15].

When memory device 200 enters the first test pattern, output state 250 is by third group input/output port DQ [8:15] it is placed in disabled status, and by the first inputoutput data IO [0:7] and the second inputoutput data IO [8:15] successively Never the input/output port DQ [0 disabled:7] it exports.

When memory device 200 enters the second test pattern, output state 250 is by second group of input/output port DQ [4:7] and third group input/output port DQ [8:15] be placed in disabled status, and by the output data of TMRW logic units 260 from Input/output port (the DQ [0 not disabled:4] it) exports.

When memory device 200 enters third test pattern, output state 250 will fully enter output port DQ [0:15] it is placed in non-disabled status, and by the first inputoutput data IO [0:7] and the second inputoutput data IO [8:15] from Fully enter output port DQ [0:15] it exports.

It is illustrated in figure 5 the circuit diagram of the output state 250 of the present embodiment, output state 250 includes the first caching Device group 251, the second buffer group 252, third buffer group 253, phase inverter 254 and logic nor gate 255.

First buffer group 251 includes multiple first buffer 251A, and the input terminal IN1 of the first buffer 251A is connected to The output end OUT1 of first memory module 241, the first buffer 251A forms first group of input/output port DQ [0:3] wherein One, the Enable Pin EN1 of the first buffer 251A is connected to supply voltage VDD, i.e., the first buffer group 251 is in supply voltage Make first group of input/output port DQ [0 under VDD effects:4] effectively.

Phase inverter 254 is connected to test pattern selecting unit 220, is used for the first test mode select signal TM1 reverse phases Output.Second buffer group 252 includes multiple second buffer 252A, and the input terminal IN2 of the second buffer 252A is connected to the One memory module 241, the output end OUT2 of the second buffer 252A form wherein the one of second group of input/output port DQ [47] A, the Enable Pin EN2 of the second buffer 252A is connected to the output end C1 of phase inverter 254, i.e., the second buffer group 252 is first When test mode select signal TM1 output logical ones, make second group of input/output port DQ [4:7] it (is closed in disabled status Closed state).

Logic nor gate 255 is connected to mode selecting unit 220, for by the first test mode select signal TM1 and the Two test mode select signal TM2 carry out logical AND non-post output.Third buffer group 253 includes multiple third buffers The input terminal IN3 of 253A, third buffer 253A are connected to the second memory module 242, the output end of third buffer 253A OUT3 forms third group input/output port DQ [8:One of 15], the Enable Pin EN3 of third buffer 253A is connected to The output end C2 of logic nor gate 255, i.e. third buffer group 253 are tested in the first test mode select signal TM1 and second When mode select signal TM2 does not export logical zero, make third group input/output port DQ [8:15] it is in disabled status.

Preferably, as shown in figure 3, the memory device 200 of the present embodiment further includes test pattern read-write (Test Mode Read Write, TMRW) logic unit 260, it is connected between the first memory module 241 and output state 250, and connection Between the second memory module 242 and output state 250, and it is connected to address latch 210 and test pattern selecting unit 230, TMRW logic units 260 are used to select control signal BLKSEL, the first test mode select signal TM1 and second according to block TM2 couples of the first inputoutput data IO [0 of test mode select signal:7] and the second inputoutput data IO [8:15] it carries out not Same logical process.

Fig. 6 is the circuit diagram of TMRW logic units 260, and TMRW logic units 260 include the first logical AND gate 265, multiple Second logical AND gate 266, multiple 6th multiple selector MUX1, multiple 7th multiple selector MUX2, multiple second logical ANDs Door 267, register 263, the first data comparator 261, the second data comparator 262 and the 5th multiple selector 264.

First logical AND gate 265 is used for the inversion signal and the second test pattern of the first test mode select signal TM1 It is exported to multiple second logical AND gates 266, the second inputoutput data IO [8 after the inversion signal logical AND of selection signal TM2: 15] each data in input second logical AND gate 266, and the second logical AND gate 266 is by the second inputoutput data IO [8:15] each data in carry out output data D [8 after logical AND with the output result of the first logical AND gate 265 respectively: 15], data D [8:15] via the third group input/output port DQ [8 of output state 250:15] caching output.

Multiple 6th multiple selector MUX1 are under the control that block selects control signal BLKSEL by the first input and output number According to IO [4:7] or the second inputoutput data IO [12:15] it exports to multiple 7th multiple selector MUX2；Multiple 7th multichannels Selector MUX2 is under the control of the second test mode select signal TM2 by the first inputoutput data IO [4:7] or second is defeated Enter output data IO [12:15] it exports to multiple second logical AND gates 267.Multiple second logical AND gates 267 test mould first By the first inputoutput data IO [4 when formula selection signal TM1 output logical zeroes:7] (BLKSEL=0) or the second input and output Data IO [12:15] (BLKSEL=1) is used as data D [4:7], data D [4:7] again via second group of output state 250 Input/output port DQ [4:7] caching output；When the first test mode select signal TM1 exports logical one, output state 250 second group of input/output port DQ [4:7] disabled, referring to table 1.

Table 1

Multiple 8th multiple selector MUX3 are under the control that block selects control signal BLKSEL by the first input and output number According to IO [0:The 3 or second inputoutput data IO [8:11] it exports to multiple 9th multiple selector MUX3；Multiple 9th multichannel choosings Device MUX4 is selected under the control of the second test mode select signal TM2 by the first inputoutput data IO [0:3] or second inputs Output data IO [8:11] it exports to multiple tenth multiple selector MUX5.

That is, as TM1=0 and TM2=0, multiple tenth multiple selector MUX5 are selected in the first test pattern By the first inputoutput data IO [0 when signal TM1 output logical zeroes:3] (BLKSEL=0) or the second inputoutput data IO [8:11] (BLKSEL=1) is used as data D [0:3], data D [0:3] again via first group of input and output of output state 250 Port DQ [0:3] caching output；When the first test mode select signal TM1 exports logical one, the of output state 250 Two groups of input/output port DQ [4:7] disabled, referring to table 1.

Register 263 is for exporting expected data exp [0:3]；First data comparator 261 is connected to register 263, the One memory module 241 and the second memory module 242, for the first inputoutput data IO [0:7] and the second input and output Data IO [8:15] with expected data exp [0:3] logic exclusive or processing is carried out, the first logical process result Out1 [0 is obtained:3], That is the first data comparator 261 is equivalent to has carried out 2 to data:1 compression.

Second data comparator 262 is connected to the first memory module 241 and the second memory module 242, for first Inputoutput data IO [0:7] and the second inputoutput data IO [8:15] it carries out logic exclusive or twice to handle, obtains second and patrol Collect handling result Out2 [0:3], that is to say, that the second data comparator 262 is equivalent to has carried out 4 by data:1 compression.

Multiple 5th multiple selector 264 are connected to the first data comparator 261, the second data comparator 262 and survey Mode selecting unit 220 is tried, for exporting the first data comparator 261 under the control of the second test mode select signal TM2 The first logical process result Out1 [0:3] or the second logical process result Out2 [0 of the second data comparator 262:3] at most A tenth multiple selector MUX5.

Fig. 7 shows the circuit structure of block selecting unit 230, and block selecting unit 230 includes the 4th logical AND gate 233, the One logic NAND gate 231 and the second logic NAND gate 232.

4th logical AND gate 233 is connected to test pattern selecting unit 220, is used for the first test mode select signal The inversion signal of TM1 exports after carrying out logical AND with the second test mode select signal TM2；First logic NAND gate 231 connects In address latch 210 and the 4th logical AND gate 233, for block to be selected control signal BLKSEL and the 4th logical AND gate 233 Output result carry out logical AND non-post output, the first logic NAND gate 231 output be the first block selection signal SELB1；The Two logic NAND gates 232 are connected to address latch 210 and the 4th logical AND gate 233, for block to be selected control signal The output of BLKSEL and the 4th logical AND gate 233 carries out logical AND non-post output, and the output of the second logic NAND gate 232 is second Block selection signal SELB2.

Further, memory device further includes Command Logic Unit 270, and there is output to allow signal port OE, row ground Location gating signal port RAS/, column address gating signal port CAS/, written allowance signal port WE/, are respectively used to input and output Allow signal, rwo address strobe signals, column address gating signal, written allowance signal, and exports internal control signal to address and lock Storage 210.

Table 1 also shows the first test mode select signal TM1 and the second test mode select signal TM2 and memory device Set 200 test pattern and the relationship of input/output port DQ.

As TM1=0 and TM2=0, memory device 200 enters third test pattern, the whole of output state 250 Input/output port DQ [0:15] it does not all disable, the first inputoutput data IO [0:7] and the second inputoutput data IO [8： 15] each data are exported by a port DQ.

As TM1=0 and TM2=1, memory device 200 enters the first test pattern, the third of output state 250 Group input/output port DQ [8:15] disabled status, the first inputoutput data IO [4 are placed in:7] (when BLKSEL=0) and second Inputoutput data IO [12:15] data D [4 is used as (when BLKSEL=1):7] via second group of input of output state 250 Output port DQ [4:7] caching output；Also, the first inputoutput data IO [0:3] (when BLKSEL=0) and second input it is defeated Go out data IO [8:11] data D [0 is used as (when BLKSEL=1):3] via first group of input/output terminal of output state 250 Mouth DQ [0:3] caching output.That is, under the first test pattern, as BLKSEL=0, the first inputoutput data IO [0:7] the input/output port DQ [0 first never disabled:7] it exports, then, as BLKSEL=1, the second inputoutput data IO[8:15] the input/output port DQ [0 never disabled again:7] it exports.

As TM1=1 and TM2=0, memory device 200 enters the second test subpattern, and the of output state 250 Three groups of input/output port DQ [8:15] and second group of input/output port DQ [4:7] it is placed in disabled status, the second data compare Second logical process result Out2 [0 of device 262:3] via first group of input/output port DQ [0 of output state 250：3] Output.

As TM1=1 and TM1=1, memory device 200 enters the first test subpattern, and the of output state 250 Three groups of input/output port DQ [8:15] and second group of input/output port DQ [4:7] it is placed in disabled status, the first data compare First logical process result Out1 [0 of device 261:3] via first group of input/output port DQ [0 of output state 250：3] Output.

The present embodiment also provides a kind of test circuit applied to above-mentioned memory device 200, including multiple memory devices It sets 200 and is connected to the tester table 20 of memory device 200, as shown in figure 8, the present embodiment is with 10 memory devices For 200, and number consecutively is DUT0, DUT1, DUT2 ... DUT9.Wherein, tester table 20 includes that block selects enable signal Output end IO2 [3], block select enable signal output end IO2 [3] to select enable signal BLKA, each memory for output block The block selection enable signal input terminal A2 of device 200 is joined together to form the first tie point E1, the first tie point E1 connections In the block selection enable signal output end IO2 [3] of tester table 20.

The port RAS/ of each memory device 200 is joined together to form the second tie point E2, the second tie point E2 companies It is connected to the port IO2 [0] of tester table 20；The port CAS/ of each memory device 200 is joined together to form third company Contact E3, third tie point E3 are connected to the port IO2 [1] of tester table 20；The port WE/ of each memory device 200 connects It is connected together to form the 4th tie point E4, the 4th tie point E4 is connected to the port IO2 [2] of tester table 20；Each memory The address control signal input terminal A1 of device 200 is connected to the port IO2 [4 for being then attached to tester table together:17]； The port OE of each memory device 200 is connected to the port IO2 [18 of tester table 20:27]；The end of tester table 20 Mouth IO [28:67] the input/output port DQ [03] of memory device 200 is connected.

It should be noted that the connection relation quantity of tester table 20 and the input/output port DQ of memory device 200 It to be set according to test pattern, that is to say, that when memory device 200 enters the second test pattern, by memory device Set 200 first group of input/output port DQ [0:3] and second group of input/output port DQ [4:7] it is connected to tester table 20, The input/output port DQ of each memory device 200 only takes up 8 ports of tester table 20；When memory device 200 into When entering the first test subpattern or the second test subpattern, by first group of input/output port DQ [0 of memory device 200:3] It is connected to tester table 20, the input/output port DQ of each memory device 200 only needs 4 of engaged test board 20 to hold Mouth IO.

Therefore, the memory device that the utility model embodiment provides can need to enter different test moulds according to test Formula, and the driving device of tester table can be shared, the port of engaged test board is reduced, testing cost is reduced.

Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to In this, any one skilled in the art within the technical scope disclosed by the utility model, it is each can to readily occur in it Kind change or replacement, these should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model It should be based on the protection scope of the described claims.

Claims (12)

1. a kind of memory device, which is characterized in that including：

There is address latch address signal input terminal and block to select enable signal input terminal, be respectively used to receive address signal Enable signal, described address latch output address is selected to control signal and block selection control signal with block；

Test pattern selecting unit has test pattern selection instruction input terminal, for receiving test pattern selection instruction signal, The test pattern selecting unit exports test mode select signal according to the test pattern selection instruction signal；

Block selecting unit, is connected to described address latch and the test pattern selecting unit, and described piece of selecting unit is used for Signal is controlled according to described piece of selection and the test mode select signal exports block selection signal；

First memory module is connected to described piece of selecting unit and described address latch, makes when according to the block selection signal When energy first memory module, described address is controlled signal interpretation and exports the first input and output by first memory module Data；

Second memory module is connected to described piece of selecting unit and described address latch, makes when according to the block selection signal When energy second memory module, described address is controlled signal interpretation and exports the second input and output by second memory module Data；And

There is output state multiple input output port, the output state to be connected to the test pattern selecting unit, And it is connected to first memory module and second memory module, when the memory device is selected according to the test pattern When selecting signal into the first test pattern, part input/output port is placed in disabled status by the output state, and by institute State the input/output port output that the first inputoutput data and second inputoutput data successively never disable.

2. memory device according to claim 1, which is characterized in that the memory device further includes：

Test pattern reads and writes logic unit, is connected between first memory module and the output state and described Between second memory module and the output state, and it is connected to described address latch and test pattern selection list Member, for controlling signal and the test mode select signal to first inputoutput data and institute according to described piece of selection It states the second inputoutput data and carries out logical process, to obtain logical process result；

Wherein, when the memory device enters the second test pattern according to the test mode select signal, the output Part input/output port is placed in disabled status, and the input/output terminal that the logical process result is never disabled by buffer Mouth output.

3. memory device according to claim 2, which is characterized in that second test pattern includes the first test Pattern and the second test subpattern；

When the memory device enters the first test subpattern according to the test mode select signal, the test pattern Read-write logic unit is used to patrol first inputoutput data and second inputoutput data with expected data execution Exclusive or processing is collected, the first logical process result is obtained；

When the memory device enters the second test subpattern according to the test mode select signal, the test pattern Logic unit is read and write to be used to execute the processing of logic exclusive or to first inputoutput data and second inputoutput data, Obtain the second logical process result.

4. memory device according to claim 3, which is characterized in that the test pattern reads and writes logic unit and includes：

Register, for exporting expected data；

First data comparator is connected to the register, first memory module and second memory module, is used for First inputoutput data and second inputoutput data are executed into the processing of logic exclusive or with the expected data, obtained To the first logical process result；

Second data comparator is connected to first memory module and second memory module, is used for described first Inputoutput data executes logic exclusive or with second inputoutput data, obtains the second logical process result；And

The input terminal of multiple selector, the multiple selector is connected to first data comparator, the second data ratio Compared with device and the test pattern selecting unit, the output end of the multiple selector is connected to the output state, described Multiple selector under the control of the test mode select signal for exporting the first logical process result and described the Any one of two logical process results.

5. memory device according to claim 2, which is characterized in that the output state includes：

The input terminal of first buffer group, including multiple first buffers, first buffer is connected to first storage Module, the output ends of multiple first buffers form first group of input/output port, wherein first buffer it is defeated Outlet is placed in non-disabled status；

The input terminal of second buffer group, including multiple second buffers, second buffer is connected to first storage Module, the output ends of multiple second buffers form second group of input/output port, wherein second buffer it is defeated Outlet is placed in disabled status according to the test mode select signal；And

The input terminal of third buffer group, including multiple third buffers, the third buffer is connected to second storage Module, the output ends of multiple third buffers form third group input/output port, wherein the third buffer it is defeated Outlet is placed in disabled status according to the test mode select signal.

6. memory device according to claim 1, which is characterized in that the test pattern selection instruction signal includes just Beginning test mode signal, fuse signal and test pattern control signal, the initial testing mode signal come from the storage The internal circuit of device device, the test pattern control signal comes from external test signal, and the test pattern controls The enabled priority of signal is higher than the fuse signal, and the enabled priority of the fuse signal is higher than the initial testing mode Signal.

7. memory device according to claim 6, which is characterized in that the test pattern selecting unit includes at least one A test pattern selection subelement, the test pattern selection subelement include：

Fuse circuit, for exporting the fuse signal and fuse enable signal according to fuse state；

First multiple selector has first input end and the second input terminal, is respectively used to input the initial testing mode letter Number and the fuse signal, first multiple selector be used under the control of the fuse enable signal, export described molten Any one of silk signal and the initial testing mode signal；

Test pattern control unit, for exporting the test pattern control signal and test pattern enable signal；And

Second multiple selector is connected to first multiple selector and the test pattern control unit, for described Under the control of test pattern enable signal, by the output signal of the test pattern control signal and first multiple selector Any one exported as the test mode select signal.

8. memory device according to claim 1, which is characterized in that when the memory device is according to the test mould When formula selection signal enters third test pattern, the output state will fully enter output port and be placed in non-disabled status, And first inputoutput data and second inputoutput data are fully entered into output port output from described.

9. memory device according to claim 1, which is characterized in that the test mode select signal includes the first survey Examination mode select signal and the second test mode select signal, described piece of selecting unit include：

Logical AND gate is connected to the test pattern selecting unit, is used for the reverse phase of first test mode select signal Signal exports after carrying out logical AND with second test mode select signal；

First logic NAND gate, is connected to described address latch and the logical AND gate, for believing described piece of selection control Number and the logical AND gate output carry out logical AND non-post export the first block selection signal；And

Second logic NAND gate, is connected to described address latch and the logical AND gate, for believing described piece of selection control Number and logical AND gate output carry out logical AND non-post export the second block selection signal.

10. a kind of test circuit for memory device, which is characterized in that including multiple such as any one of claim 1 to 9 institute The memory device stated and the tester table being connect with the part input/output port of the memory device.

11. test circuit according to claim 10, which is characterized in that the tester table includes block selection enable signal Output end, for exporting described piece of selection enable signal, described piece of selection enable signal input of multiple memory devices End is joined together to form the first tie point, and first tie point is connected to the enabled letter of described piece of selection of the tester table Number output end.

12. test circuit according to claim 10, which is characterized in that the memory device is believed with row address strobe Number port, column address gating signal port, written allowance signal port, the row address strobe letter of multiple memory devices Number port is joined together to form the second tie point, the column address gating signal port connection of multiple memory devices Third tie point is formed together, and the written allowance signal port of multiple memory devices is joined together to form the 4th Tie point, second tie point, the third tie point and the 4th tie point are connected to the tester table An input/output port.