WO2007018084A1 - シーケンシャルアクセス型半導体記憶装置の書き込み保護方法 - Google Patents
シーケンシャルアクセス型半導体記憶装置の書き込み保護方法 Download PDFInfo
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- WO2007018084A1 WO2007018084A1 PCT/JP2006/315259 JP2006315259W WO2007018084A1 WO 2007018084 A1 WO2007018084 A1 WO 2007018084A1 JP 2006315259 W JP2006315259 W JP 2006315259W WO 2007018084 A1 WO2007018084 A1 WO 2007018084A1
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/22—Safety or protection circuits preventing unauthorised or accidental access to memory cells
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0863—Arrangements for preparing, mixing, supplying or dispensing developer provided with identifying means or means for storing process- or use parameters, e.g. an electronic memory
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/06—Developing structures, details
- G03G2215/066—Toner cartridge or other attachable and detachable container for supplying developer material to replace the used material
- G03G2215/0695—Toner cartridge or other attachable and detachable container for supplying developer material to replace the used material using identification means or means for storing process or use parameters
- G03G2215/0697—Toner cartridge or other attachable and detachable container for supplying developer material to replace the used material using identification means or means for storing process or use parameters being an electronically readable memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/14—Protection against unauthorised use of memory or access to memory
- G06F12/1416—Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights
- G06F12/1425—Protection against unauthorised use of memory or access to memory by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights the protection being physical, e.g. cell, word, block
Definitions
- the present invention relates to a semiconductor memory device accessed sequentially and an access control method in a semiconductor memory device accessed sequentially. Background technology.
- a semiconductor memory device that allows only sequential access to data cells of a memory array for example, E EP PROM, is known. Since such a semiconductor memory device is relatively inexpensive, it is used as a memory device for holding data relating to the remaining amount or consumption of the consumption material. In addition, after writing initial data to a predetermined data storage area of the memory array of the semiconductor memory device, the predetermined data storage area is written by storing map information of the write-inhibited area at a predetermined position of the memory array. A technology that prohibits loading (read only) is known. Disclosure of the invention
- the address to be accessed is specified by the number of pulses of the clock signal input from the outside, and the clock signal advances due to noise. In this case, the address that should be accessed may be easily shifted.
- a semiconductor equipped with a predetermined data storage area that is a rewritable area followed by a data-inhibited area is a data that should be stored in the predetermined data storage area. May be stored in the rewritable area.
- the present invention has been made in order to solve the above-described problems. Therefore, it is an object to reduce or prevent erroneous writing of data to the rewritable area.
- a first aspect of the present invention provides a semiconductor memory device.
- the semiconductor memory device is a memory array that is sequentially accessed from the head address, and includes a rewritable area for storing rewritable data and a rewritable area.
- a memory array having a write-protected area for storing read-only data; an access request receiving unit that receives an access request for a desired address in the memory array; and an access to the write-protected area Includes a flag setting unit that turns on a flag and a memory control unit that controls access to the memory array, and refers to information specifying a write-inhibited area in the memory array, and the desired address can be rewritten.
- the flag is on.
- characterized in that it comprises a said desired memory controller has a running writing of data to Adoresu.
- the flag is turned on when the desired address is included in the rewritable area with reference to the information specifying the write prohibited area in the memory array.
- the memory control unit that does not write data to the desired address is provided, it is possible to reduce or prevent erroneous writing of data to the rewritable area.
- the memory control unit refers to information for specifying a write prohibited area in the memory array, and the desired address is included in the write prohibited area. May only read data from the desired address. In this case, data is not written to the write-protected area, and only data can be read.
- the memory control unit refers to information for specifying a write prohibited area in the memory array, and If an address is included in the rewritable area and the flag is not turned on, data writing to the desired address may be executed. In this case, data can be written to the rewritable area.
- the information specifying the write-inhibited area may be described in an area from the head address to the rewritable area.
- the write-protected area can be specified at the initial stage of access to the memory array.
- identification information for identifying the semiconductor memory device may be further described in an area from the head address to the rewritable area. In this case, it is possible to identify whether the semiconductor memory device is a semiconductor memory device to be accessed at the initial stage of access to the memory array.
- the flag setting unit may turn off the flag upon receiving a reset signal.
- data can be written to the rewritable area by inputting a reset signal.
- the flag on / off setting information may be stored in the memory control unit. In this case, it is possible to manage flag on / off by the memory control unit.
- the flag setting unit may turn off the flag upon receiving a reset signal.
- data can be written to the rewritable area by inputting a reset signal.
- the memory control unit further includes Reference is made to information for specifying a write-inhibited area in the memory array, and when the desired address is included in the rewritable area and the flag is turned on, data is written to the desired address
- a write prohibition control unit that issues a write prohibition signal, and a write execution unit that does not write data to the memory array when a write prohibition signal is received from the write prohibition control unit. good.
- the write prohibition voice IJ control unit and the write execution unit can reduce or prevent erroneous data writing to the rewritable area.
- a memory array that is sequentially accessed from a head address, a rewritable area for storing rewritable data, and a read-only data following the rewritable area.
- a control device for a semiconductor memory device including a memory array having a write inhibit area.
- the control device of the semiconductor memory device according to the second aspect of the present invention includes: an access request receiving unit that receives an access request for a desired address in the memory array of the semiconductor memory device; and an access to the write-protected area.
- the semiconductor memory device of the second aspect of the present invention it is a case where a desired address is included in the rewritable area with reference to the information specifying the write prohibited area in the memory array, and the flag is turned on.
- the access control unit that does not write data to a desired address is provided, it is possible to reduce or prevent erroneous data writing to the rewritable area.
- a memory array that is sequentially accessed from a head address, a rewritable area for storing rewritable data, and a read-only data for storing the rewritable area.
- An access control method in a semiconductor memory device including a memory array having a write inhibit area.
- An access control method in a semiconductor memory device includes: an access request for a desired address in the memory and a ray; a reference to information for specifying a write prohibited area in the memory array; When the desired address is included in the rewritable area, and the flag that is turned on when the write-protected area is accessed is turned on, data is written to the desired address.
- the same operational effects as those of the semiconductor memory device according to the first aspect of the present invention can be obtained.
- An access control method in a semiconductor memory device is the first aspect of the present invention. It can be realized in various modes in the same manner as the semiconductor memory device.
- the method according to the third aspect of the present invention can also be realized as a computer-readable recording medium on which a program and a program are recorded.
- FIG. 1 is a block diagram showing a functional internal configuration of the semiconductor memory device according to this embodiment.
- FIG. 2 is an explanatory diagram schematically showing an internal configuration map of a memory array provided in the semiconductor memory device according to the present embodiment.
- FIG. 3 is an explanatory view exemplifying a map as light lock area information stored in the memory array of the semiconductor memory device according to the embodiment.
- FIG. 4 is a flowchart showing a processing routine of internal memory processing executed in the semiconductor memory device according to this embodiment.
- Fig. 5 is a timing chart showing the temporal relationship between the reset signal RST, the external clock signal SCK :, the data signal SDA, and the address counter value during the read operation.
- FIG. 6 is a flowchart showing the processing routine of the writing process executed in the semiconductor memory device of this embodiment.
- Figure 7 is a timing chart showing the temporal relationship between the reset signal RST, the external clock signal SCK, the data signal SDA, and the address counter value when the write operation is executed.
- FIG. 8 is a flowchart showing the processing routine of the inspection process executed for the semiconductor memory device at the time of shipment from the factory.
- FIG. 9 is an explanatory view showing an application example of the semiconductor memory device according to this embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram showing a functional internal configuration of the semiconductor memory device according to this embodiment.
- FIG. 2 is an explanatory diagram schematically showing an internal configuration map of a memory array provided in the semiconductor memory device according to the present embodiment.
- FIG. 3 is an explanatory view exemplifying a map as the write lock area information stored in the memory array of the semiconductor memory device according to this embodiment.
- the semiconductor storage device 10 is a sequential access type storage device that does not need to input address data for designating an access destination address from the outside. It is a position.
- Semiconductor memory device 1 0 includes memory array 1 00, address counter 1 1 0, IN / OUT controller 1 20, ID comparator 1 30, write / read controller 140, incremental controller 1 50, charge pump circuit Path 1 60, 8-bit latch register 1 70, and write lock controller 1 80. These circuits are connected by a bidirectional bus type signal line. Note that at least the IN / OUT controller 120, ID comparator 130, light Z. read controller 140, increment controller 150, and light lock controller 180 may be collectively referred to as a memory control unit.
- the memory array 100 has an EEPROM array 1001 and a mask ROM array 100.
- the E E PROM array 1 0 1 is a storage area having the characteristics of an E E PROM that can be electrically erased and written.
- the mask ROM array 102 is a storage area having the characteristics of a mask ROM that cannot be erased or rewritten in which data is written during the manufacturing process.
- the EE PROM array 10 0 1 of the memory array 100 and the mask R0M array 1 0 2 are provided with a plurality of data cells (memory cells) for storing 1-bit information schematically shown in FIG. .
- the memory array 100 has 8 addresses (addresses for 8 bits of data) as a predetermined address unit in one row.
- the EEPROM array 1 0 1 contains 8 data cells (8 bits) per row and 16 data cells (16 words) per column, 16 words x 8 bits (128 bits) G) data can be stored.
- the mask ROM array 10 2 contains 8 data cells (8 bits) in 1 row and 8 data cells (8 words) in 1 ⁇ lj. 8 words X 8 bits (64 (Bit) data can be stored.
- the address map for memory array 1 0 will be described with reference to FIG.
- the memory array 100 in the present embodiment includes the above-described normal EEPROM array 100 1 and mask ROM array 102.
- EEPROM array 1 0 In the dress (A0 to A2, 2 columns, 3 bits in the first row), identification information (ID information) for identifying each semiconductor memory device is stored.
- ID information identification information
- W write protect information
- WL D Write address area information WL D for identifying a predetermined area where writing is prohibited in the fifth and sixth addresses (columns A5 and A6 in the first row) Is stored. Note that data is written to the EEPROM memory array 10 0 1 after reading the ID information and write protect information (WZL) from the first row including the first 6 addresses. Cannot write to the first line.
- the write protect information (W / L) for example, when the value of the fourth address is “1”, this means that writing to a predetermined area is prohibited, If the value of the fourth address is “0”, it means that writing to the specified area is allowed.
- the writer area information WLD for specifying the predetermined area is used to specify the predetermined area by a combination of values stored in the fourth and fifth addresses, for example, as shown in FIG. It is done.
- the second and subsequent areas are defined as the predetermined area. That is, it corresponds to the memory map example shown in FIG.
- the 7th byte and later (8th byte and later from the beginning) excluding the 1st row is set as the predetermined area.
- the 8th byte and beyond (after the 9th byte from the first row) excluding the 1st row is set as the predetermined area.
- 9th address (0 8 H) to 16th address (0 FH) and 1st 7th address (1 0 H) to 24th address (0 7 H) of EEP ROM array 1 0 1 are fixed conditions
- the 16-bit information that can be rewritten is A rewritable area to be stored.
- a line constituted by the ninth address to the 16th address and the 17th address to the 24th address is a write-restricted line, or the ninth address to the 16th address.
- each of the 8th address from the 17th address to the 24th address may be referred to as a write limit storage address in a predetermined address unit.
- the fixed condition is, for example, when the stored information is information about the ink consumption, when the value of the written data is larger than the value of the existing data, or when the stored information is ink In the case of information on the remaining amount, the value of the written data is smaller than the value of the existing data.
- the 2nd to 7th rows are the write-restricted area WRA, and the 1st row is excluded 8 If the bytes after the write-protected area WPA, the second to eighth lines are set as the write-restricted area WRA.
- the mask ROM array 1 0 2 is written with information (data) when the memory array is manufactured. After the memory array is manufactured, it cannot be written even before shipment from the factory.
- the mask ROM array 10 2 is a 64-bit data storage area, and the maximum address of the mask ROM array 1 0 2 that can be logically specified is 1 9 2 (B FH).
- 0 0 is the mask ROM array 1 0 2 Even after the maximum address is exceeded, a circuit configuration is provided that outputs dummy data (for example, 0) up to the second 56th address (FFH).
- the memory array 100 becomes an extremely easy memory array having virtually two storage areas of 1 2 8 words X 1 2 8 bits.
- the memory array 100 includes a plurality of rows in units of 8 bits. However, each row is not an independent data cell column. This is realized by bending in 8-bit units. In other words, for convenience, the row containing the 9th bit is simply called the second byte, and the row containing the 17th bit is called the 3rd byte.
- sequential access method in order to access from the head sequentially, so-called sequential access method, and to the desired address possible in the random access method. Direct access is not possible.
- Each data cell in the memory array 100 is connected to a word line and a bit (data) line, and the corresponding word line (row) is selected (selection voltage is applied) to the corresponding bit line. Data is written to the data cell by applying a write voltage. Also, the corresponding word line (row) is selected, the corresponding bit line is connected to the I N / OUT controller 120, and the data (1 or 0) of the data cell is read depending on whether or not current is detected.
- the predetermined address unit in this embodiment can be said to be the number of addresses (the number of data cells) that can be written by applying a write voltage to one of the write lines.
- the column selection circuit 1 0 3 connects (IJ (bit line) to the IN / OUT controller 1 2 0 sequentially according to the number of external clock pulses counted by the address counter 1 1 0.
- the column selection circuit 103 selects the bit line according to the lower 4 bits of the 8- bit value indicating the number of clock pulses counted by the address counter 110.
- the row selection circuit 1 0 4 is connected to the external clock counted by the address counter 1 1 0.
- a selection voltage is applied to the rows (word lines) sequentially according to the number of lock pulses.
- the row selection circuit 104 selects the word line according to the value of the upper 4 bits of the 8-bit value indicating the number of clock pulses counted by the address counter 110.
- access to the memory array 10 0 using the address data is not executed, and is counted only by the address counter 1 1 0. Access to the desired address is executed according to the number of clock pulses.
- the address counter 110 is connected to the reset signal terminal RSTT, clock signal terminal SCKT, column selection circuit 1003, row selection circuit 1004, and light no-read controller 1420.
- the address counter 1 1 0 is reset to the initial value by setting the reset signal input via the reset signal terminal RSTT to 0 (or low). After the reset signal is set to 1, the external clock The number of clock pulses is counted (count value is incremented) in synchronization with the falling edge of the clock pulse input via signal terminal SCKT.
- the address counter 110 used in this embodiment is an 8-bit address counter that stores the number of eight clock pulses corresponding to the number of data cells (number of bits) in one row of the memory array 100. is there.
- the initial value may be any value as long as it is associated with the start position of the memory array 1 0 0. Generally, 0 is used as the initial value. .
- the address counter 1 1 0 includes a carry-up unit 1 1 1 for setting the maximum count value of the number of clock pulses to be counted. When the counted number of clock pulses reaches the maximum count value, the address counter 1 1 0 returns the count value to the initial value corresponding to the start position of the memory array 1 100. That is, the address specified by the address counter 110 becomes the start address of the memory array 100.
- the EEPROM array 1 0 1 and the mask ROM array A memory array 1 0 0 comprising 1 0 2 is used.
- EEP ROM array 1 0 1 has 1 28 addresses from 1st address (00H) to 1st 28th address (7 FH), and mask ROM array 1 0 2 has 1st 29th address. It has 64 addresses from (80H) to 1922 address (B FH).
- the mask ROM array 102 is a 64-bit data storage area, and the maximum address of the mask ROM array 10.2 that can be logically specified is 1 9 2, but as described above, the mask R ⁇ After exceeding the maximum address of M array 10 2, dummy data is output until the address reaches 256 (F FH).
- the IN / OUT controller 120 transfers the write data input to the data signal terminal SDAT to the memory array 100, or receives the data read from the memory array 100 and receives the data signal terminal S DAT. It is a circuit to output to I NZOUT controller 1 2 is connected to data signal terminal SDAT, reset signal terminal RS TT, memory array 100, light ⁇ read controller 140, and according to the request from write / load controller 140 The data transfer direction for the memory array 100 as well as the data transfer direction for the data signal terminal S DAT (the signal line connected to the data signal terminal S DAT) is controlled. An input signal line from the data signal terminal S DAT to the I NZOUT controller 120 is connected to an 8-bit latch register 170 that temporarily stores the write data input from the data signal terminal S DAT.
- the 8-bit latch register 1 70 holds the data string (MS B) input from the data signal terminal SDAT via the input signal line until it reaches 8 bits. When 8 bits are collected, the EE PROM array 1 0 8-bit data held for 1 is written.
- the 8-bit latch register 170 is a so-called FIFO shift register, and when the 9th bit of input data is newly latched, the already latched 1st bit data is released.
- I NZOUT controller 1 20 By setting the data transfer direction to the read 100 as the read direction and setting the input signal line between the 8-bit latch register 170 and the IN / OUT controller 120 to high impedance, data input to the data signal terminal SDAT can be performed. Ban. This state is maintained until a write processing request is input from the write Z read controller 140. Therefore, the data of the first 4 bits of the data string input via the data signal terminal S DAT after the reset signal is input is not written to the memory array 100. On the other hand, the first 4 bits of the memory array 100 The data stored in is sent to the ID comparator 130. As a result, the first 4 bits of the memory array 100 are in a read-only state.
- Comparator 1 30 has clock signal terminal S CKT and data signal terminal S D
- the ID comparator 1 ⁇ 0 acquires the first 3 bits of the operation code that is input after the reset signal R ST T is input, that is, identification data.
- the ID comparator 1 30 is a 3-bit register (not shown) that stores identification data included in the input data string, and the most significant 3 bits of identification data obtained from the memory array 100 via the IN / OUT controller 120. It has a 3-bit register (not shown) to store, and whether or not the identification data matches is determined by whether or not the values in both registers match.
- the ID comparator 130 sends an access permission signal EN to the light read controller 140 when the two identification data match.
- the write load controller 140 reads the write Z read control information included in the data string input via the data signal terminal S DAT in synchronization with the fourth clock signal after the reset signal RST is input. This is a circuit that confirms the 3-bit 'ID information following the ID information) and switches the internal operation of the semiconductor memory device 10 to either writing or reading.
- the write Z read controller 140 receives the write enable / receive signal AEN from the ID comparator 1 3 ⁇ ⁇ ⁇ and the write enable signal WEN1 from the increment controller WEN1. Analyze the read command. If the write Z read controller 140 receives a number of clock pulses corresponding to the start address of the write restriction area WRA, if it is a write command, the bus signal line of the I NZOUT controller 120 is Switch the data transfer direction to the write direction, send a write enable signal WE N 2 that permits writing, and request the charge-positive circuit 1 6 0 to generate a write voltage.
- the write / read controller 140 changes the data transfer direction of the path signal line to the IN / OUT controller 120. Switch to the read direction, finish sending the write enable signal WEN 2 to allow writing, and request the charge pump circuit 160 to finish generating the write voltage.
- the write / read controller 140 receives a number of clock pulses corresponding to the start address of the write-inhibited area if it is a read command, the data transfer direction of the bus signal line to the IN / OUT controller 120 Switch to the reading direction.
- the write data DI power written in the write-restricted row is a data having a characteristic that the value increases [1 (increment). Larger than existing data DE If the data has the characteristic that the write data DI force value decreases (decrement), the write data DI is smaller than the existing data DE already stored in the write restriction row. Judgment of whether or not the write data DI is garbled and incorrect data input is reduced or prevented.
- This function is provided by the increment controller in the former case and the decrement controller in the latter case. In this example, in the following description, taking the former as an example? I will explain.
- the increment controller 15 0 is connected to the reset signal terminal R ST T, the light ⁇ Z read controller 14 0, the charge pump circuit 1 60, and the light lock controller 1 80 via signal lines.
- the increment controller 1 5 0 has a 4-bit counter 1 5 1 and 8-bit internal registers 1 5 2 and 1 5 3 inside.
- the increment controller 1 5 0 determines whether or not the write data DI to be written to the write limit row is larger than the existing data DE already stored in the write limit row. Further, the EEPR OM array 1 0 ' Determine whether the data written to 1 has been written correctly (verify, verify).
- the increment controller 1 5 0 reads the existing data DE from the write restriction row of the EEPROM array 1 0 1 at the timing when the write data DI is latched into the 8-bit latch register 1 70, and is provided internally with the 8-bit internal register 1 5 Store in 2. Increment controller 1 5 0 compares existing data ED to be read with write data DI input to 8-bit latch register 1 ⁇ 0 in 1-bit units, and write data DI is larger than existing data DE. It is determined whether it is data. In order to speed up the processing and reduce the circuit scale, it is desirable that the input write data is MSB.
- the increment controller 15 0 If the write data DI is larger than the existing data DE, the increment controller 15 0 In response, write enable signal WEN 1 is output. In addition, when there are multiple write-restricted rows, the increment controller 1 5 0 can write the write permission signal only when the write data DI is larger than the existing data DE in all write-restricted rows. WEN 1 is output. As will be described later, when the write lock signal WEN 1 is notified from the write lock controller 180, the write enable signal WEN 1 is not issued.
- the increment controller 1 5 0 verifies whether the data has been written correctly. If the write data is not written correctly, the 8-bit internal register 1 5 2 The existing data DE stored in is written back to the memory array 1 0 0.
- the 4-bit counter 1 5 1 provided in the increment controller 1 5 0 is 8 bits behind the external clock signal from the write standby state, and the charge pump circuit 1 6 Internal oscillator provided for 60 1 6 2 Starts counting up upon receiving an internal clock signal from 2. The count value counted up by the 4-bit counter 1 5 1 is input to the column selection circuit 1 0 3 and the row selection circuit 1 0 4, and the existing data DE just written is read out.
- the charge pump circuit 1 60 is required when writing data to the EE PROM array 1 0 1 based on the request signal from the write Z read controller 1 4 0.
- This is a circuit for supplying the selected bit line via the selection circuit 103.
- the charge pump circuit 160 has an internal oscillator 16 2 that generates the necessary operating frequency when boosting the voltage, and generates the necessary write voltage by boosting the voltage obtained via the positive power supply terminal VDDT. To do.
- the light controller controller 180 is connected to the clock signal terminal S CKT, the data signal terminal SD AT, the reset signal terminal RS TT, and the increment controller 15 0.
- the write lock controller 1 80 has executed access to the first address of the write-protected area WP A by increasing the number of clock signal pulses input from the clock signal terminal S CKT. Determine whether or not.
- FIG. 4 is a flowchart showing a processing routine of internal memory processing executed in the semiconductor memory device 10 according to this embodiment.
- FIG. 5 is a timing chart showing the temporal relationship between the reset signal RST, the external clock signal SC :, the data signal SDA, and the address counter value when the read operation is executed.
- FIG. 6 is a slochar chart showing the processing routine of the writing process executed in the semiconductor memory device 10 of this embodiment.
- Figure 7 is a timing chart showing the temporal relationship between the reset signal RST, external clock signal SCK :, data signal SDA, and address counter value when a write operation is executed.
- step S 1 00 the internal reset initializes the I N / OUT controller 120, I D comparator 13 0, write / read controller 140, increment controller 1 50, and write lock controller 180.
- the ID comparator 1 30 of the semiconductor memory device 10 acquires 3-bit identification information input from the host computer (step S 1 0 2), and acquires the acquired identification information and the identification stored in the memory array 100.
- An ID search process is performed to determine whether the information matches (S 104).
- the ID comparator 1 30 receives data input to the data signal terminal S DAT in synchronization with the rising edges of the three clock signals S CK after the reset signal RST is switched from low to high.
- 3-bit identification information is acquired and stored in the first 3-bit register.
- ID comparator 1 30 counts the counter value of end address counter 1 1 0
- the identification information ID 0, ID 1, and ID 2 is obtained from the first 3 bit address of the memory array 100 specified by 0, 0 1, 0 2, and stored in the second 3 bit register.
- the ID comparator 13 3 determines whether or not the identification information stored in the first and second registers match. If the identification information does not match (step S 104 : mismatch), the data signal The bidirectional bus signal line connected to the terminal SDAT is set to the input state, reception of the identification information ID is terminated (step S106), and this processing routine is terminated.
- the IN / OUT controller 1 2 0 maintains the high impedance state for the input signal line between the 8-bit latch register 1 70 and the IN / OUT controller 1 20, so access to the memory array 100 is not I'm not allowed.
- the ID comparator 1 3 0 sends an access permission signal A EN to the write-in read controller 140. Output.
- the write / read controller 140 that receives the access enable signal AEN synchronizes with the rising edge of the fourth clock signal SCK after the reset signal RST switches from low to high from the host computer.
- the command bit input to the bus signal line via the data signal terminal SDAT is acquired (step S 1 0 8).
- the write read controller 140 determines whether or not the acquired command bit is a write command or an instruction (step S 1 1 0). If the acquired command bit is not a write command (step S 1 1 0). : No), a read command is output to the IN / OUT controller 120 to execute a data read process (step S 1 1 2).
- the I N / OUT controller 1 2 0 changes the data transfer direction to the memory array 100 to the read direction (output state) and allows data transfer from the memory array 100.
- the address counter 1 1 0 of the semiconductor memory device 10 counts up in synchronization with the fall of the clock signal S CK and counts the number of input clock pulses. In addition Because the address counter value of the address counter 1 1 0 after the input of the talent code is 04, it is read from the existing data DE stored in 04H of the memory array 1 00.
- the memory array 10 0 of the semiconductor memory device 10 according to the present embodiment has only addresses 00 H to BFH, but the address counter 1 1 0 has 2 ⁇ 56 bits (address F Counts up to FH).
- the addresses COH to FFH are pseudo areas, and the corresponding addresses do not exist in the memory array 100. The period during which such pseudo areas are accessed is the value for the data signal terminal S DAT.
- the existing data DE stored in the next address (data cell) in the memory array 100 is decremented. Is output to the data signal terminal S DAT. This operation is repeated in synchronization with the clock signal SCK until the desired address is reached.
- the semiconductor memory device 10 in this embodiment is a sequential access type memory device, the host computer issues the number of cued signal pulses corresponding to the address to be read or written. , Address counter 1 1 0 The counter value must be incremented to the force count value corresponding to the given address.
- the existing data DE is Read sequentially from the address specified by the counter value of the address counter 110 that is sequentially incremented in synchronization with the clock signal SCK.
- the host computer specifies the data of the desired address by managing the data output from the semiconductor memory device 10 and the number of clock pulses output to the semiconductor memory device 10 in association with each other. , get.
- a reset signal R ST of 0 or LOW is input from the host computer, and the semiconductor memory device 10 is put in an operation code reception standby state.
- the light lock controller 1 80 is initialized.
- the write read controller 140 determines whether or not the acquired command bit is a write command (step S 1 1 0). If the acquired command bit is determined to be a write command by the write / read controller 140 (step S1 1 0: Yes), the write lock controller '180 will not store the EEPROM memory array.
- Write protect information (W / L) is acquired from the fourth address (0 3 H) of 1 0 1 (step S 1 1 4).
- the write process executed here is a process that includes writing data to the write-protected area WPA of the EE PROM memory array 10 0 1, and writes read-only data to the EE PROM memory array 1 0 1. It is processing.
- step S 1 1 8 The write process executed in step S 1 1 8 will be described with reference to FIG.
- the clock signal SCK of the number of clock pulses corresponding to the address to which access is desired is applied to the clock signal terminal S CKT of the semiconductor memory device 10.
- data to be written as initial data is input to the data signal terminal S DAT in synchronization with the clock signal and stored in the 8-bit latch register 170.
- write data is written in units of 8 bits to a memory array 100 of 1 row and 8 bits.
- the light controller controller 1 80 determines whether the address for which write processing is requested is an address included in the write restriction area WRA (step S200), and determines that it is not included in the write restriction area WRA. In this case (Step S200: No), the write inhibit signal is not issued to the increment controller 150. As a result, the write read controller 140 executes data write processing in units of 8 bits for the requested address, specifically, an area that will later become a write-inhibited area (step S 202).
- the increment controller 1 5 0 that has not received the write inhibit signal from the light controller controller 1 80 transmits the write enable signal WEN 1 to the write Z read controller 140.
- the troller 140 receives the access permission signal A EN from the ID comparator 130 and, in addition, receives the write permission signal W EN 1 from the increment controller 150.
- the write / read controller 140 that has received the access enable signal A EN and the write enable signal WEN 1 outputs a write enable signal ⁇ ; WEN 2 to the IN / OUT controller 1 2 0.
- the I NZOUT controller 1 20 changes the data transfer direction to the memory array 100 to the write direction (input state) and allows the data transfer to the memory array 100.
- the write Z read controller 140 requests the charge pump circuit 160 to generate a write voltage after the rising of the clock signal SCK in the eighth cycle after the write standby state shown in FIG.
- the write voltage generated by the charge pump circuit 160 is applied to the bit line selected by the column selection circuit 103, in this embodiment all the bit lines.
- 8-bit data “1” and “0” stored in the 8-bit latch register 170 are written into the write-in restriction row at a time.
- the programmer controller 1 8 0 determines whether the address to be written corresponds to the start address of the write-protected area (step S204), and determines that it corresponds to the start address of the write-protected area. In such a case (step S 2 04: Y es), the passage flag is turned on (step S 206). If the write lock controller 180 determines that the start address does not correspond to the write-protected area (step S204: No), it maintains the current value of the pass flag. Specifically, this applies to the case where the address to be written is an address after the start address of the write-protected area.
- each controller is initialized as described above. Is set to the operation code acceptance standby state, and the writing process is completed.
- Step S212 No.
- the clock signal S CK is continuously input to the clock signal terminal S CKT of the semiconductor memory device 10
- the clock signal S CK at the eighth cycle corresponds to the falling edge (see Fig. 7).
- the count value of the address counter 1 1 0 is incremented by 1 (step S 2 1 4).
- the target address is incremented to the start address of the next 1 byte.
- write data DI data for the next byte
- the next address for 8 addresses
- Address counter 1 1 0 Based on the number of clock pulses corresponding to address 7 FH That is, when counting up to 1 28, the address on the memory array 10 0 specified by the address counter 1 1 0 returns to the address 00H. In other words, when the value of the 8th bit (most significant bit) of the 8-bit register of address counter 1 1 0 becomes 1, the start address 00 of EEPROM 1 0 1 in memory array 100 H is specified as the next access address.
- the write process for a given area in the EEPROM memory array 1 0 1 is one line including the first address 00 H of the EEPROM 1 0 1 (contrast with the operation code). The first write process) is the last write process.
- the formal identification information ID In the first line including the first address 00H of E EPROM 1 0 1, the formal identification information ID, the write lock information (W / L), and the information indicating the write lock area are described. If “1” is written as the write lock information (W / L), then writing to the write-protected area is prohibited.
- step S200 determines whether or not the pass flag is turned on. Determine (Step S 2 08). That is, it is determined whether or not the access is to the write restriction area WRA after passing through the head address of the write prohibition area.
- step S208 If the light controller controller 180 determines that the passage flag is on (step S208: Yes), it issues a write inhibit signal to the increment controller 150. As a result, the write enable signal WEN 1 is issued from the increment controller 150 to the write Z read controller 140. It is not executed, and writing processing to the write restriction area WRA is not executed (step S 2 1 0). As a result, after writing to or reading from the area of the EE PROM memory array 10 1 that will be the write-protected area after the initial data write, writing to the write restriction area WRA will not be executed. .
- the memory array 10 0 0 is a memory array that is accessed sequentially from the first address, after accessing the first address in the write-protected area, it reaches the write restriction area WRA. To pass the end address of the write-protected area. Therefore, when noise is added to the clock signal and the count number has advanced, data is written to an address different from the address to which data is written in the write restricted area WRA, or written to the write protected area. Data to be written may be written to the write restriction area WRA. In particular, writing to the write restriction area WR A in this embodiment is controlled so that only a value larger than the value of the existing data is always written by the increment controller 150 as described above and later. It has been.
- erroneous writing in the write restriction area WR A may hinder incremental writing to the write restriction area WR A.
- writing to the write restriction area WRA is not executed, so that erroneous writing in the write restriction area WRA is reduced. Or it can be prevented.
- step S 208 If the light lock controller 180 determines that the passage flag is not turned on (step S 208: No), it does not issue a write inhibit signal to the increment controller 150. As a result, a write enable signal WEN 1 is issued from the increment controller 1 5 0 to the write read controller 140, and a write process to the write restriction area WRA is executed (step S 2 1 2).
- writing to the write restriction area WRA is correct. It is necessary to test whether this is always done, and this writing process is executed. In this writing process, for example, writing is executed to the highest address of the write restriction area WRA, so that inhibition of incremental writing after shipment from the factory is prevented. In other words, the upper 1 bit or 2 bits of 8 bits per row are used for the write test, and the remaining 7 bits or 6 bits are used for storing the rewrite data.
- the passing flag is turned off, the operation code is accepted and the writing process is completed.
- step S 2 1 2 N 0
- the clock signal SCK is sent from the host computer to the semiconductor memory device.
- the clock signal terminal SCKT of 10 is continuously input, the count value of the address counter 1 1 0 is 1 according to the falling of the clock signal SCK at the 8th cycle (see Fig. 7). Incremented (step S 2 1 4).
- step S 1 1 6 Y es
- the write data DI is 16 bits long data and the write limit row is 2 rows (8 addresses X 2) will be described.
- 16-bit write data is written into the memory array 100 of 1 row and 8 bits.
- the most significant bit (M The 8-bit data from SB) is sequentially latched into the 8-bit latch register 170 in synchronization with the rising edge of the clock signal SCK.
- the write enable signal WEN2 is output to the IN / OUT controller 120, the existing data after the 8th address of the memory array 100 is sequentially synchronized with the falling edge of the clock signal SCK. Output on the data output signal line (data signal terminal SDA).
- the existing data DE output on the data output signal line is input to the increment controller 15 Q, the write data DI latched in the 8-bit latch register 170, and the write data DI in the increment controller 1 5 0 Is used to determine whether is greater than the existing data DE.
- the clock signal terminal S CKT of the semiconductor memory device 10 receives from the host computer the clock signal S CK having the number of clock pulses corresponding to the address desired to be accessed, that is, the address desired to write data.
- the value (0 or 1) of the write data DI is transferred to each bit line of the memory array 100.
- Write Z read controller 1 40 requests the charge pump circuit 1 60 to generate a write voltage after the rising edge of the clock signal SCK in the eighth cycle after the write standby state.
- the bit line selected by the circuit 103 is applied to all the bit lines in this embodiment. As a result, the 8-bit data “1” and “0” stored in the 8-bit latch register 1 70 are once stored. Will be written to the write limit line.
- the address counter 1 1 0 When the clock signal SCK at the 8th cycle falls, the address counter 1 1 0 The count value is incremented by 1, and the write data DI (second byte data) to be written to the next address (eight addresses) is fetched. In addition, it is verified whether or not the existing data DE just written and the write data DI used for writing match in the same period after the falling edge of the clock signal SCK in the 8th cycle. Processing is executed. In other words, during the clock row period, the count value for specifying the address of the existing 8-bit data DE just written by the 4-bit counter 1 5 1 provided in the increment controller 150 is selected by the column. Input to circuit 1 0 3 and row selection circuit 1 04.
- the 8-bit existing data DE that has just been written is output from the IN / OUT controller 1 20, and the 8-bit internal register 1 5 provided in the increment controller 1 5 0 is passed through the IN / O UT controller 1 20.
- Increment controller 1 5 0 determines whether 8-bit existing data DE stored in 8-bit internal register 15 3 matches 8-bit write data DI stored in 8-bit latch register 1 70. Verify whether or not.
- the write data DI is 16-bit long data, and since the write limit line is 2 lines (8 addresses X 2), if the above processing is executed twice, the write limit line Writing data DI to is completed.
- the write-no-read controller 140 executes the write processing of the write data DI to the write restriction area WR A until the next address to be accessed is designated as the first address of the write-inhibited area WP A (step S). 1 22: No).
- the write / read controller 1 40 sets the write voltage to the charge pump 1 60. Request to stop generation (step S 1 24), and end this processing routine. If the write voltage generated by the charge pump 1 6 0 is not used, the EE PROM memory array 1 0 1 Since writing (storing) data is impossible, the writing process stops when the generation of the write voltage in the charge pump 160 is stopped.
- the write data sent from the host computer has the same value (0 or 1) as the data currently stored in the memory array 100, except for the data corresponding to the address to be rewritten. have. In other words, the address data that cannot be rewritten in the memory array 100 is overwritten with the same value.
- FIG. 8 is a flowchart showing a processing routine of an inspection process executed on the semiconductor memory device at the time of shipment from the factory.
- the host computer outputs a reset signal to the reset signal terminal RSTT to internally reset the semiconductor memory device 10 (step 'S 300).
- the internal reset of the semiconductor memory device 10 is executed by receiving a reset signal R ST and initializing a predetermined controller.
- the host computer outputs the identification information ID and the Read command to the data signal terminal SDAT (step S 3 0 2), and reads the existing data stored in the memory array 100 (step S 3 04). .
- the semiconductor memory device 10 after the processing described above is executed by the ID comparator 13 and write read controller 140, the data stored in the memory array 100 is output onto the data signal terminal SDA. To do.
- the host computer determines whether the data that should be stored as the existing data (initial data) matches the existing data (step S 30 6), and if the two data do not match (step S 30). 306: No), leaving a record that there is a memory error (step S3 1 4) End this processing routine.
- the host computer outputs the identification information ID and the Write command to the data signal terminal S DAT (step S 3) when the two data match (step S 306: Yes). 08).
- the host computer outputs write data including write data for the write-inhibited area WPA to the data signal terminal SDA in synchronization with the clock signal SCK (step S 3 1 0).
- the host computer determines whether data has been written to the write-protected area WP A, that is, whether the write lock is valid (step S 3 1 2), and the write lock is valid. If it is determined that there is (step S 3 12: Y es), this processing routine is terminated. On the other hand, if the host computer determines that the write lock is not valid, that is, if writing to the write-protected area WPA has been executed (step S 3 1 2: No), it is said that a memory error has occurred. Leave a record (step S 3 1 4) and terminate this processing routine.
- the determination of whether or not the write lock is valid is executed by, for example, reading data from the memory array 100 after inputting the write data and comparing it with the initial data used in step S304. The That is, if the two data match, this means that writing to the write-inhibited area WPA has not been executed, and therefore it can be determined that the writer is valid.
- the effectiveness of the writeter can also be determined by determining whether or not writing to the write restriction area WRA is performed normally.
- only data with a value larger than the value of the existing data can be written to the write restriction area WRA.
- the initial data that is, when the write protect information (WL) is ON (1)
- writing to the write restriction area WR A is prohibited to prevent erroneous writing to the write restriction area WR A. It is illustrated. Therefore, if write to the write restriction area WRA can be executed, it can be determined that the write protect information (W / L) is effective.
- FIG. 9 is an explanatory view showing an application example of the semiconductor memory device according to this embodiment.
- the semiconductor storage device 10 according to the present embodiment is provided in a storage container for storing a consumption material, for example, an ink storage body 3 10, 3 11, 3 12 for storing ink as a printing recording material.
- a host computer 300 provided in the printing apparatus via a bus.
- the data signal line SDA, the clock signal line S CK, the reset signal line RST, the positive power supply line VDD, and the negative power supply line VSS from the host computer 300 are the ink containers 3 1 0, 3 1 1, 3 1 2 Is connected to the semiconductor memory device 10 provided in the memory.
- information about the amount of ink is stored in the semiconductor storage device 10.
- the combination of the write protect information (WZL) and the passage flag determines the predetermined number of EE PROM memory arrays 1 and 1 that become the write prohibited area WPA.
- Writing to the write-restricted area WRA after access to this area can be prohibited.
- the data to be written to the write-inhibited area WPA is restricted.
- a situation where data is written to the area WRA, or erroneous writing in the write restriction area WRA can be reduced or suppressed.
- Write restriction area WR A Write data whose value is larger than the existing data value If only this is allowed, erroneous writing in the write restriction area WRA becomes a problem. In other words, for example, when the remaining ink level (consumption) is recorded in the write restriction area WRA, if a value equivalent to 50% remaining (consumption) is erroneously written when shipped from the factory, 100% The remaining value of ⁇ 50% (consumption value of 0% ⁇ 50%) cannot be recorded. This problem can be solved by using the semiconductor memory device 10 according to this embodiment.
- writing to a predetermined area in the EEPROM memory array 101 can be prohibited by the write protect information (W / L).
- the predetermined area serving as the write-protected area WPA is identified based on information stored in the EE PROM memory array 101 as, for example, the write lock area information WLD.
- the write controller signal is output from the light controller controller 180 to the increment controller 150 to stop issuing the write enable signal WEN 1, but the write enable signal Separately from WEN 1, the write lock signal may be issued directly from the write lock controller 180 to the write / read controller 140.
- the write / read controller 140 receives the write inhibit signal from the write controller 1880, even if the write enable signal WEN 1 and the access enable signal AEN are received, the I ZO controller 1
- the write enable signal WEN 2 cannot be issued to 20, and the charge pump 160 cannot request to generate the write voltage.
- the write lock controller 180 is provided separately, and the write lock controller 180 reads and manages the write protect information (W / L) and pass flag.
- the light Z read controller 140 may have the above function of the light lock controller 180.
- the write lock area information WLD uses information that specifies the write-inhibited area WPA in byte units, but in addition to this, the write-inhibited area in address units is used. Information specifying WP A may be used.
- the ink cartridge is used as an application example, but the same effect can be obtained in the toner cartridge.
- the same effect can be obtained when applied to a medium storing currency equivalent information such as a prepaid card.
- DE 1 and the write D I 1 latched in 8-bit latch register 1 70 may be executed in 8-bit units.
- the 1st byte write data released in 1-bit units from the 8-bit latch register 1700 without the 4-bit counter 15 1 and 8-bit internal register 1 53 It may be executed by comparing DI 1 and existing data DE 1 read in 1-bit units from the first write-restricted row of memory array 100 in 1-bit units. In such a case, the increment controller 150 is not needed
- 16-bit write data is described as an example, but in addition to this, the bit length of one row of the memory array 100, such as 24-bit length and 32-bit length The same applies to data having a data length that is a multiple of And the same effect can be obtained.
- the semiconductor memory device and the access control method in the semiconductor memory device according to the present invention have been described based on some embodiments.
- the embodiments of the present invention described above are intended to facilitate understanding of the present invention.
- the present invention is not limited thereto.
- the present invention can be changed and modified without departing from the spirit and scope of the claims, and it is needless to say that the present invention includes equivalents thereof.
Abstract
Description
Claims
Priority Applications (6)
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JP2006552415A JP4910705B2 (ja) | 2005-08-10 | 2006-07-26 | シーケンシャルアクセス型半導体記憶装置の書き込み保護方法 |
BRPI0614247-8A BRPI0614247A2 (pt) | 2005-08-10 | 2006-07-26 | método de proteção contra gravação de dispositivo de armazenamento semicondutor de acesso seqüencial |
AU2006277451A AU2006277451A1 (en) | 2005-08-10 | 2006-07-26 | Write protection method of sequential access semiconductor storage device |
CN2006800296201A CN101243519B (zh) | 2005-08-10 | 2006-07-26 | 顺序访问型半导体存储装置的写入保护方法 |
EP06768411A EP1921631A4 (en) | 2005-08-10 | 2006-07-26 | METHOD OF PROTECTION AGAINST WRITING OF SEMICONDUCTOR STORAGE DEVICE WITH SEQUENTIAL ACCESS |
CA002616359A CA2616359A1 (en) | 2005-08-10 | 2006-07-26 | Write protection method of sequential access semiconductor storage device |
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JP5170246B2 (ja) * | 2008-08-05 | 2013-03-27 | 日本電気株式会社 | 半導体検証装置、方法およびプログラム |
JP5233801B2 (ja) * | 2009-04-01 | 2013-07-10 | セイコーエプソン株式会社 | 記憶装置、ホスト回路、基板、液体容器、不揮発性のデータ記憶部に格納されたデータをホスト回路に送信する方法、ホスト回路と、前記ホスト回路と着脱可能な記憶装置を含むシステム |
US9135168B2 (en) | 2010-07-07 | 2015-09-15 | Marvell World Trade Ltd. | Apparatus and method for generating descriptors to reaccess a non-volatile semiconductor memory of a storage drive due to an error |
US9141538B2 (en) | 2010-07-07 | 2015-09-22 | Marvell World Trade Ltd. | Apparatus and method for generating descriptors to transfer data to and from non-volatile semiconductor memory of a storage drive |
US8868852B2 (en) * | 2010-07-07 | 2014-10-21 | Marvell World Trade Ltd. | Interface management control systems and methods for non-volatile semiconductor memory |
US8184487B2 (en) * | 2010-08-30 | 2012-05-22 | Micron Technology, Inc. | Modified read operation for non-volatile memory |
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US9767045B2 (en) * | 2014-08-29 | 2017-09-19 | Memory Technologies Llc | Control for authenticated accesses to a memory device |
CN104354473B (zh) * | 2014-09-29 | 2016-03-30 | 珠海艾派克微电子有限公司 | 一种成像盒芯片及成像盒 |
CN104570653B (zh) * | 2014-12-26 | 2017-10-10 | 珠海赛纳打印科技股份有限公司 | 一种图像形成装置及对附加纸盒的控制方法 |
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US11561707B2 (en) | 2021-01-08 | 2023-01-24 | Western Digital Technologies, Inc. | Allocating data storage based on aggregate duplicate performance |
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- 2006-07-26 AU AU2006277451A patent/AU2006277451A1/en not_active Abandoned
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CN101243519B (zh) | 2010-10-13 |
AU2006277451A1 (en) | 2007-02-15 |
US20070050584A1 (en) | 2007-03-01 |
RU2008108626A (ru) | 2009-09-20 |
TW200717527A (en) | 2007-05-01 |
EP1921631A1 (en) | 2008-05-14 |
JP4910705B2 (ja) | 2012-04-04 |
KR20080033531A (ko) | 2008-04-16 |
CA2616359A1 (en) | 2007-02-15 |
JPWO2007018084A1 (ja) | 2009-02-19 |
US7406576B2 (en) | 2008-07-29 |
BRPI0614247A2 (pt) | 2011-03-15 |
EP1921631A4 (en) | 2009-03-11 |
CN101243519A (zh) | 2008-08-13 |
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