WO2007013568A1 - 半導体記憶装置 - Google Patents
半導体記憶装置 Download PDFInfo
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- WO2007013568A1 WO2007013568A1 PCT/JP2006/314927 JP2006314927W WO2007013568A1 WO 2007013568 A1 WO2007013568 A1 WO 2007013568A1 JP 2006314927 W JP2006314927 W JP 2006314927W WO 2007013568 A1 WO2007013568 A1 WO 2007013568A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 11
- 238000007726 management method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 description 17
- 101100424823 Arabidopsis thaliana TDT gene Proteins 0.000 description 9
- 238000013500 data storage Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000005055 memory storage Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002123 temporal effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 108700028369 Alleles Proteins 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C8/00—Arrangements for selecting an address in a digital store
- G11C8/04—Arrangements for selecting an address in a digital store using a sequential addressing device, e.g. shift register, counter
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C8/00—Arrangements for selecting an address in a digital store
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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
- G11C16/08—Address circuits; Decoders; Word-line control circuits
Definitions
- the present invention relates to a semiconductor memory device accessed sequentially and an address management method in the semiconductor memory device accessed sequentially.
- Semiconductor memory storage devices for example, EE EE PP RR OO MM, for example, are known. .
- the semiconductor memory storage device such as here is a relatively low-priced product, so that the remaining consumption material remains. It is used as a storage device for storing data in relation to consumption or consumption data.
- the . also, it has multiple data storage storage areas, for example, EE EE PP RR OO MM area and Mamassk RR OO MM area.
- Semiconductor memory storage devices are also being put to practical use. . In a semiconductor memory storage device having a plurality of data case storage areas, use the MAMASK RR OO MM area area here. Therefore, it is unnecessary to read / write data from / to the semiconductor memory storage device and to write / write data for exclusive use only. There are advantages that become . Disclosure of the invention
- the sequential access type semiconductor memory device has a single data storage area having a writable area smaller than the read-only area, it is counted up to the last address of the read-only area. Otherwise, it will not be possible to return to the start address of the writable area. As a result, there is a problem that it takes time to write data that requires more time than data reading.
- each data storage area is An addressless decoder must be provided, and the circuit configuration scale tends to increase.
- the present invention has been made to solve the above-described problem, and in a semiconductor memory device, the data writing time is shortened and the circuit configuration necessary for address designation is reduced. With the goal.
- a first aspect of the present invention provides a semiconductor memory device.
- the semiconductor memory device specifies a target address to be accessed by counting a count value, and an address counter having a maximum count value different between data reading and writing.
- a non-volatile memory array that is sequentially accessed up to the target address specified by the address counter, and data for writing write data in a predetermined address unit from the target address of the memory array Writing means; and data reading means for reading data from a target address of the memory array.
- the target address to be accessed is specified by using the address counter whose maximum count value is different at the time of reading and writing data.
- the data write time can be shortened and the circuit configuration necessary for address designation can be reduced.
- the addressless counter is
- the head address of the memory array may be designated after counting the count value up to each maximum count value. In this case, it is possible to return to the top address of the memory array after the count value reaches the maximum count value.
- the address counter is
- the number of external clock signals may be counted in synchronization with an external clock signal input from the outside of the semiconductor memory device.
- a desired address of the memory array can be designated by an external clock signal.
- the memory array includes: a first storage area having a first final address; and a first storage area having a second final address. And a second storage area following the maximum storage power
- the count value is a count value corresponding to the first final address
- the maximum count value at the time of reading is a value obtained by adding a predetermined value to the count value corresponding to the second final address. May be. In this case, since the address designating process for the second storage area is not executed when data is written, the time required for writing data to the first storage area can be shortened.
- the address counter may specify a head address of the first storage area in the memory array after counting up to each maximum count value. In this case, it is possible to return to the first address of the first storage area after the count value reaches the maximum force count value.
- the first storage area is a storage area where data can be written, and the second storage area can only read data. It can be a storage area. In this case, only the address designating process for the first storage area is executed when writing data, and the addressing process for the first and second storage areas is executed when reading data.
- the first storage area is a storage area capable of storing 128-bit data
- the second storage area is 64 bits.
- the address counter is an 8-bit address counter, and when writing, the value of the 8th bit takes 1, and then the first address of the first storage area is specified.
- the first address of the first storage area may be specified after all the 8-bit values are 1. In this case, it is possible to return to the first address of the first storage area after the count value reaches 256 times when reading data and after the count value reaches 128 bits when writing data. .
- the second aspect of the present invention is a nonvolatile memory that is accessed sequentially until the target address specified by an address counter that counts in synchronization with an external clock is reached.
- an address management method in a semiconductor memory device having an emissive memory array it is determined whether an access request to the memory array is a write request or a read request, and the access request is a write request, When the clock is counted up to the first maximum power value, the head address of the memory array is designated, the access request is a read request, and the external clock is connected to the first clock. When counting up to a second maximum count value larger than the maximum count value, the start address of the memory array may be designated.
- the address management method it is possible to obtain the same functions and effects as those of the semiconductor memory device according to the first aspect of the present invention, and the key according to the second aspect of the present invention.
- the dress management method can be implemented in various modes in the same manner as the semiconductor memory device according to the first mode of the present invention.
- the method according to the second aspect of the present invention can also be realized as a program and a computer-readable recording medium recording the program.
- 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 view schematically showing an internal configuration map of the memory array provided in the semiconductor memory device according to the present embodiment.
- Figure 3 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. 4 is a flowchart showing a processing routine of data read processing executed by the semiconductor memory device and the host computer of this embodiment.
- Figure 5 shows the reset signal RST and external clock signal S during the write operation. This is a timing chart showing the temporal relationship between CK, data signal SDA, and address counter value.
- FIG. 6 is a flowchart showing a processing routine of data write processing executed by the semiconductor memory device 10 and the host computer of this embodiment.
- FIG. 7 is an explanatory diagram 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.
- the semiconductor storage device 10 is a sequential access type storage device that does not require input of address data for designating an access destination address from the outside.
- Semiconductor memory device 1 0 includes memory array 1 00, addressless counter 1 1 0, IN / OUT controller 1 20, ID comparator 1 3 0, write Z read controller 1 40, increment controller 1 5 0, charge pump circuit 1 6 0, 8 bit latch register 1 70 is provided. Each circuit is connected by a bus-type signal line.
- the memory array 100 includes an EEP ROM array 10 1 and a mask ROM array 10 2.
- EEPROIV [Array 1 and 1 is a storage area that has the characteristics of an EEPROM that can electrically erase and write data.
- 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 EEPROM array 10 1 and mask ROM array 10 2 of the memory array 10 0 are provided with a plurality of data cells (memory cells) that store 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.
- an EEPROM array 1 0 1 contains 8 data cells (8 bits) in one row and 16 data cells (16 words) in one column. 1 6 words x 8 bits (1 28 Bit) data can be stored.
- 8 data cells (8 bits) and 1 ⁇ (8 data cells (8 words) are arranged in 1 row, 8 words X 8 bits (64 (Bit) data can be stored.
- the memory array 100 in the present embodiment includes the EEPROM array 1001 and the mask ROM array 1002.
- Identification information (ID information) for identifying each semiconductor memory device is stored in the first 3 addresses of the EE PROM array 10 1 (A0 to A2 column in the first row, ⁇ 3 bits). Writing to the first line including the first 3 addresses is prohibited, and cannot be rewritten after shipment from the factory, for example.
- the 9th address of EE PROM array 1 0 1 (0 8 H) to 1 6th address (0 FH) and 1 7th address (1 0 H) to 24th address (0 7 H) stores '16 bits of information that can be rewritten under certain conditions.
- 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.
- 8 addresses from the 1st 7th address to the 24th address are sometimes referred to as the write limit storage address for a specific address unit.
- the certain condition is, for example, when the stored information is information about ink consumption, and the value of the written data is larger than the value of the existing data. Or, if the stored information is information related to the remaining amount of ink, the value of the data to be written is smaller than the value of the existing data.
- the mask ROM array 1 0 2 is written with information (data) when the memory array is manufactured. After the memory array is manufactured, writing cannot be executed 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 10 2 that can be logically specified is 1 9 2 (BFH).
- 0 0 has a circuit configuration that outputs dummy data (for example, 0) until the 2nd 56th address (FFH) even after the maximum address of the mask ROM array 10 2 is exceeded. Yes.
- the memory array 100 becomes an easy-to-handle memory array that virtually has 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 bit units. In other words, for the sake of convenience, the row containing the 9th bit is simply called the 2nd byte, and ⁇ the row containing the 1st 7th bit is simply 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. Select the corresponding word line (row) (apply a selection voltage), Data is written to the data cell by applying a write voltage to the corresponding bit line. Also, the corresponding word line (row) is selected, the corresponding bit line is connected to the IN / OUT controller 120, and the data (1 or 0) in 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 (number of data cells) that can be written by applying a write voltage to one of the lead lines.
- the column selection circuit 103 connects the columns (bit lines) sequentially to the I N / QUT controller 120 according to the number of external clock pulses counted by the address counter 110. For example, the column selection circuit 10 03 selects a bit line according to the value of 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 104 sequentially applies a selection voltage to the rows (word lines) according to the number of external clock pulses counted by the address counter 1 1 0. For example, the row selection circuit 104 selects a 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. As described above, in the semiconductor memory device 10 according to the present embodiment, access to the memory array 100 using the address data is not executed, and according to the number of clock pulses counted exclusively by the address counter 110. Access to the desired address is performed.
- the address counter 110 is connected to the reset signal terminal RSTT, clock signal terminal SCKT, column selection circuit 103, row selection circuit 104, and light Z read controller 140.
- Address counter 1 1 0 is reset to the initial value by setting the reset signal input via 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 eight clock pulses corresponding to the number of data cells (bits) in one row of the memory array 100. .
- the initial value may be any value as long as it is associated with the start position of the memory array 100, and 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 force count value of the number of clock pulses to be counted. Address counter 1
- the address counter 110 used in the present embodiment uses different maximum count values when writing data to the memory array .1 00 and when reading data from the memory array 100. Specifically, when the address counter 1 1 0 receives a notification from the write Z read controller 140 that the requested access is a data write, the maximum counter in the carry-up unit 1 1 1 1 Set the value to 1 28 bits. On the other hand, when the end address counter 1 1 0 receives a notification from the write read controller 1 40 that the requested access is data read, the carry up unit 1 1 1 sets the maximum count value to 2 5 Set to 6 bits.
- the memory array 100 including the EE PROM array 1001 and the mask ROM array 102 is used.
- EE PROM array 10 01 has 1 28 addresses from address 1 (00H) to address 1 28 (7 FH), and mask ROM array 102 has address 1 29 (80 H).
- It has 64 addresses of 1st 92nd address (B FH). Since data cannot be written to the mask ROM array 1 0 2
- the maximum power count value of the address counter 1 1 0, that is, the maximum address of the memory array 100 that can be specified by the address counter 1 1 0 is the 128th address. As a result, it is possible to omit counting the address corresponding to the mask ROM array 102 that cannot write data, and to reduce the time required for writing data.
- the maximum count value of the address counter 110 that is, the maximum address of the memory array 100 that can be designated by the address counter 110 is the 256th address.
- the address corresponding to the mask ROM array 10 2 can be accessed, and the data stored in the mask ROM array 10 2 can be read.
- the mask ROM array 10 2 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 92. R ⁇ After the maximum address of the M array 1 0 2 is exceeded, 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 It is a circuit for outputting to DAT.
- I NZOUT controller 1 20 is connected to data signal terminal SDAT, reset signal terminal RS TT, memory array 1 00, write // read controller 1 40, and according to the request from write / load controller 140
- the data transfer direction to the memory array 100 and the data transfer direction (of the signal line connected to the data signal terminal S DAT) to the data signal terminal S DAT are switched and controlled.
- An input signal line from the data signal terminal S D AT to the I N / OUT controller 120 is connected to an 8-bit latch register 170 that temporarily stores write data input from the data signal terminal SDAT.
- the 8-bit latch register 170 has an input signal from the data signal terminal SDAT.
- the data string (MS B) input via the line is held until it becomes 8 bits, and when 8 bits are aligned, the 8-bit data held for the EEPROM array 1 0 1 Is written.
- the 8-bit latch register 170 is a so-called FIF 0 type shift register, and when the 9th bit of the input data is newly latched, the already latched 1st bit data is released.
- the I NZOUT controller 1 20 sets the data transfer direction for the memory array 1 00 to the read direction when the power is ON and resets, and the input signal line between the 8-bit latch register 1 70 and the I NZOUT controller 1 20 is Data input to the data signal terminal S DAT is prohibited. This state is maintained until a write processing request is input from the write / 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 the 4th bit is don't care) is sent to the ID comparator 1 30. As a result, the first 4 bits of the memory array 100 are read-only.
- the ID comparator 1 30 is connected to the clock signal terminal S CKT, the data signal terminal SD AT, and the reset signal terminal RSTT, and the identification data included in the input data string input via the data signal terminal SDAT and the memory array 1 Determine whether the identification data stored in 00 (EE PROM array 1 0 1) matches. More specifically, the ID comparator 100 acquires the first 3 bits of the operation code input after the reset signal RST is input, that is, identification data.
- ID comparator 1 3 0 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 memory array 100 via IN / OUT controller 1 20 Has a 3-bit register (not shown) to store, and the values in both registers match It is determined whether or not the identification data matches depending on whether or not to do so.
- the ID comparator 130 sends an access permission signal EN to the write Z read controller 140 when both identification data match.
- Write / Read controller 140 is IN / OUT controller 1 20 ID comparator 1 3 0 , Increment controller 15 0, Charge pump circuit 16 0, Clock signal terminal S CKT, Data signal terminal SDAT, Reset signal terminal RS TT.
- the write / load controller 140 is connected to the data signal terminal in synchronization with the fourth clock signal after the reset signal RST is input.
- a circuit that checks the write / read control information (4th bit information following the 3-bit ID information) input via DAT and switches the internal operation of the semiconductor memory device 10 to either write or read. is there. Specifically, when the write enable signal AEN from the ID comparator 13 0 and the write enable signal WEN 1 from the increment controller WEN 1 are input, the write Z read controller 140 receives the acquired write Analyzes / read command. If it is a write command, the write / read controller 140 switches the data transfer direction of the bus signal line to the write direction with respect to the IN / OUT controller 120, and a write enable signal for permitting the write.
- the existing data DE already stored in the write-restricted row DE The write data DI is already stored in the write limit line if the write data DI is data that has a characteristic that the value decreases (decrement).
- Incorrect data DI data is garbled and incorrect data input is reduced or prevented.
- This function is provided by an increment controller in the former case and a decrement controller in the latter case. In this embodiment, the former will be described as an example in the following description.
- the increment controller 15 0 is connected to the reset signal terminal R ST T, the write / read controller 14 0, and the charge pump circuit 16 0 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.
- Increment controller 1 5 0 determines whether or not the write data DI written to the write-restricted row is larger than the existing data DE already stored in the write-restricted row. Furthermore, the EEPROM array 1 0 1 Determine whether the data written to is correctly written (verify, verify).
- Increment controller 1 5 0 reads the existing data DE from the write-restricted row of EEPROM array 1 0 1 at the timing when write data DI is latched in 8-bit latch register 1 7 0, and provides 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 the data is. In order to speed up the processing and reduce the circuit scale, it is desirable that the input write data is MSB.
- Increment controller 15 0 outputs write enable signal WEN 1 to write read controller 14 0 when write data DI is larger than existing data DE.
- the increment controller 1 5 0 can write the write enable signal WEN only if the write data DI is larger than the existing data DE in all write-restricted rows. 1 is output.
- Increment controller 1 5 0 verifies whether the data has been written correctly after writing the write data. If the write data is not written correctly, the 8-bit internal register 15 The existing data DE stored in 2 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 0 1 6 2 Receives an internal clock signal from 2 and starts counting up.
- 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 160 selects the write voltage required to write data to the EEPROM array 10 0 1 based on the request signal from the write / read controller 140. This is a circuit for supplying the selected bit line via the circuit 103.
- the charge pump circuit 160 has an internal oscillator 16 2 'that generates the necessary operating frequency when boosting the voltage, and boosts the voltage obtained via the positive power supply terminal VDDT, thereby increasing the required write voltage. Generate.
- FIG. 3 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 read operation is executed.
- FIG. 4 is a flowchart showing a processing routine of data read processing executed by the semiconductor memory device 10 and the host computer of this embodiment.
- the semiconductor memory device 10 starts the memory side read processing.
- the host computer synchronizes the data signal SDA including the 4-bit operation code with the external clock signal and inputs it to the data signal terminal SDAT of the semiconductor memory device 10. More specifically, the host computer first transmits 3-bit identification information to the semiconductor memory device 10 (step S f 100 2).
- the memory array 1000 contains identification information ID 0, ID 1, ID 2, and command bits for deciding to write or read in the 4th bit from the beginning, as shown in Fig. 3. ing.
- the comparison of identification information is performed as follows.
- the ID comparator 1 30 of the semiconductor memory device 10 executes an ID search process for determining whether or not the input identification information matches the identification information stored in the memory array 100 (Sml OO). Specifically, the ID comparator 130 receives the data input to the data signal terminal S DAT in synchronization with the rising edges of the three clock signals SCK after the reset signal RST is switched from low to high, that is, Acquire 3-bit identification information and store it in the first 3-bit register. At the same time, the ID comparator 1 3 0 acquires data from the address of the memory array 1 00 specified by the counter values 00, 0 1 and 0 2 of the address counter 1 1 0, that is, 'stores in the memory array 1 00 The obtained identification information is acquired and stored in the second 3-bit register.
- the ID comparator 130 determines whether or not the identification information stored in the first and second registers match, and if the identification information does not match (step Sm l 0 0 : mismatch), IN / OUT
- the controller 120 maintains the high impedance state for the input signal line between the 8-bit latch register 170 and the IN / OUT controller 120. As a result, access to the memory array 100 is not permitted, and the data read process ends.
- the ID comparator 130 will Sm 1 00: Match), output the access enable signal AEN to the write Z read controller 140.
- the host computer sets the command bit (read command, eg, 0 bit) in synchronization with the rising edge of the fourth clock signal SCK after the reset signal RST switches from low to high. Input to signal terminal S DAT (step S h 104).
- the write Z read controller 140 that has received the access permission signal A EN obtains the command bit sent to the bus signal line via the data signal terminal S DAT and determines whether or not it is a write command. To do.
- Write Read controller 14 ⁇ Outputs read command to I NZOUT controller 12 ⁇ if the acquired command bit is not a write command.
- the IN / OUT controller 120 that has received the read command changes the data transfer direction to the memory array 100 to the read direction (output state) (step Sm 1 0 2) and transfers the data from the memory array 100. Allow.
- the write / read controller 140 notifies the address counter 110 that the requested access is data reading. In response to this notification, the count-up unit 1 1 1 of the address counter 1 1 0 sets the maximum count value to 256 bits.
- the host computer uses the clock signal S CK of the number of clock pulses corresponding to the address where the access is desired, that is, the address where the data desired to be read is stored, to the clock signal terminal S of the semiconductor memory device 10. Output to CKT (step S h 1 0 6).
- the address counter 110 in the semiconductor memory device 10 counts up in synchronization with the falling edge of the clock signal SCK and counts the number of input clock pulses (Sm 104). Since the force counter value of the address counter 110 after the operation code is input is 04, it is read from the existing data DE stored in 04H of the memory array 100.
- Memory array of semiconductor memory device 10 according to this embodiment 1 00 has only addresses from 0 0H to B FH, but as described above, the address counter 1 1 0 is set to 25 6 bits (address F in the carry-up section 1 1 1). 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 SDAT. “0” is output.
- the address counter 1 1 0 counts up to the number of clock pulses corresponding to the address F FH, that is, 2 56
- the address on the memory array 100 specified by the address counter 1 1 0 is the address Return to 00H (Step S m 106).
- the address counter 1 1 0 counts up to the number of clock pulses corresponding to the address F FH, that is, 2 56
- the address on the memory array 100 specified by the address counter 1 1 0 is the address Return to 00H (Step S m 106).
- the first address 0 0 H of the EEPROM 10 1 in the memory array 100 is the next access address address. As fingered.
- the existing data DE stored in the memory array is sequentially output to the data signal terminal S DAT via the I NZOUT controller 120 in synchronization with the falling edge of the clock signal S CK (step Sm 1 08)
- the output existing data DE is retained for the period until the next falling edge of the clock signal SCK.
- the count value in the address force counter 110 is incremented by one, and as a result, the existing data stored in the next address (data cell) in the memory array 100 DE is output to the data signal terminal SDAT. This repeated operation is performed in synchronization with the clock signal S CK 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 clock signal pulses corresponding to the address desired to be read or written, and Dress counter 1 1 0
- the counter value must be incremented to the count value corresponding to the given address.
- the existing data DE is counted in the address counter 1 1 0, which is incremented sequentially in synchronization with the clock signal SCK. Sequentially read from the address specified by the data value.
- the host computer receives data that is output sequentially from the semiconductor memory device 10 (step S h i 0 8). As described above, since the memory array 100 in this embodiment is a sequential access memory, the data stored in the memory array 100 is sequentially read until the desired address is reached. The host computer specifies data of a 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 (S h 1 1 0).
- a reset signal RST 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.
- FIG. 5 is a timing chart showing the temporal relationship among the reset signal R ST T, the external clock signal S CK, the data signal SDA, and the address counter value when the write operation is executed.
- FIG. 6 is a flowchart showing a processing routine of data write processing executed by the semiconductor memory device 10 host computer of this embodiment. In the semiconductor memory device 10 according to the present embodiment, writing is executed in row units (8-bit units), that is, in predetermined address units (8 address units).
- the host computer synchronizes the data signal S DA including the 4-bit operation code with the external clock signal and inputs it to the data signal terminal S DAT of the semiconductor memory device 10. More specifically, the host computer first transmits 3-bit identification information to the semiconductor memory device 10 (step S f 2 0 2).
- the ID comparator 1 3 0 of the semiconductor memory device 10 executes ID search processing for determining whether or not the input identification information matches the identification information stored in the memory array 1 0 0 ( Sm 2 0 0). Specifically, the ID comparator 1 3 0 is input to the data signal terminal S DAT in synchronization with the rising edges of the three clock signals SCK after the reset signal RST is switched from low to high. Data, ie, 3-bit identification information is acquired and stored in the first 3-bit register.
- ID comparator 1 '3 0 has a counter value 0 0, 0 1 of address counter 1 1 0
- the data is acquired from the address of the memory array 100 specified by 0 2, that is, the identification information stored in the memory array 100 is acquired and stored in the second 3-bit register.
- the ID comparator 13 0 determines whether or not the identification information stored in the first and second registers match. If the identification information does not match (step Sm2 0 0: mismatch), the I NZOUT controller 1 2 0 holds the high impedance state for the input signal line between the 8-bit latch register 1 7 0 and the I NZOUT controller 1 2 0. As a result, access to the memory array 10 0 is not permitted, and the data read process ends. On the other hand, if the identification information stored in the 1st and 2nd registers match (step. S m 2 0 0: match), the ID comparator 1 3 0 will send the write / read controller 1 4 0 In response, the access permission signal AEN is output. 2006/314927
- the host computer synchronizes the command bit (write command, eg, 1 bit) in synchronization with the rising edge of the fourth clock signal SCK after the reset signal R ST switches from low to high.
- Is input to the data signal terminal S DAT (Step Sh 204).
- the write Z read controller 140 that received the access permission signal A EN obtains the command bit sent to the bus signal line via the data signal terminal S DAT and determines whether it is a write command. judge.
- Write z Read controller 1 40 allows write to I NZOUT controller 120 when the acquired command bit is a write command and write enable signal WEN 1 is received from increment controller 1 5 0 Outputs signal WEN 2.
- the I NZOUT controller 120 changes the data transfer direction to the memory array 100 to the write direction (input state) (step Sm 202) and allows the data transfer to the memory array 100.
- the write Z read controller 140 notifies the address counter 110 that the requested access is data writing. In response to this notification, the count-up unit 1 1 1 of the address counter 1 1 0 sets the maximum count value to 1 28 bits.
- the host computer outputs to the clock signal terminal S CKT of the semiconductor memory device 10 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 (step).
- S h 20 6 When the address counter 1 1 0 counts up to the number of clock pulses corresponding to the address 7 FH, that is, 1 2 8, the address on the memory array 1 00 specified by the address counter 1 1 0 returns to the address 00H. (Step Sm206). In other words, when the value of the 8th bit (most significant bit) of the 8-bit register of address counter 110 becomes 1, the first address 00H of EE PROM 1 0 1 in memory array 100 becomes the next access. Specified as an address.
- 16-bit write data is written to the memory array 10 0 in one row and 8 bits.
- the 8-bit data from the most significant bit (MS B) of the write data DI is sequentially latched into the 8-bit latch register 1700 in synchronization with the rising edge of the clock signal SCK. .
- the write enable signal WEN 2 is output to the I NZOUT controller '1 2 0, the existing data after the 8th address of the memory array 10 0 0 is synchronized with the falling edge of the clock signal SCK.
- Data is sequentially output on the data output signal line (data signal terminal SDA).
- the existing data DE output on the data output signal line is the write data input to the increment controller 150 and the latched data in the 8-bit latch register 170.
- the IN / OUT controller 1 2 0 changes the data transfer direction to the memory array 1 0 0 to the write direction, and the signal line between the 8-bit latch register 1 7 0 and the I NZOUT controller Cancels the high impedance setting and allows data transfer.
- write data DI ( ⁇ or 1) is transferred to each 0 bit line.
- the write Z read controller 140 requests the charge pump circuit 160 to generate a write voltage after the rising edge of the clock signal SCK in the eighth cycle after the write standby state, and the generated write voltage is
- the bit line selected by the column selection circuit 10 3 is applied to all the bit lines in this embodiment, and as a result, the 8-bit data stored in the 8-bit latch register 170 “1” and “0” forces are written to the write limit line at once.
- the increment controller 150 is provided during the clock low period.
- a count value for designating the address of the existing 8-bit data DE just written by the 4-bit counter 1 51 is input to the column selection circuit 103 and the row selection circuit 104.
- the 8-bit existing data DE that has just been written is output from the IN / OUT controller 120, and the 8-bit internal register 1 5 3 provided in the increment controller 150 is passed through the I NZO UT controller 120.
- Stored in 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 data
- the write-restricted row is 2 rows (8 addresses X 2).
- the write to the write-restricted row Writing of data DI is completed.
- the write data sent from the host computer has the same value (0 or 1) as the data currently stored in the memory array 10 0 0 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. 7 is an explanatory diagram 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 1 1, 3 12 for storing ink as a printing recording material.
- a storage container for storing a consumption material for example, an ink storage body 3 10, 3 1 1, 3 12 for storing ink as a printing recording material.
- each ink container 3 10, 3 1 1, 3 1 2 is installed in the printing apparatus, it is connected to the 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 connected to each ink container 3 1 0, 3 1 1, It is connected to the semiconductor memory device 10 0 ′ provided in 3 1 2.
- information about the amount of ink is stored in the semiconductor storage device 10.
- the maximum count value of the address counter 110 is different between data writing and data reading. Even when 0 has a plurality of different data storage areas, the circuit configuration required for address designation is reduced, and the semiconductor memory device Device 10 can be made compact. In other words, when writing data, the value corresponding to the maximum address of the EEPROM array 10 1 to which data can be written is set as the maximum count value, and when reading data, the maximum address (logical address) of the mask ROM array 1 0 2 is set.
- Number + virtual address number is set as the maximum power count value, so that a single address counter 1 1 0 can write data to EEPROM array 1 0 1 and EEPROM ROM array 1 0 1 and Data can be read from the mask ROM array 10 2.
- the maximum storage capacity in the memory array 100 is set to 2 n, there are two signal lines to be drawn from the address counter 110 to the memory array 100.
- the circuit for decoding the address can be simplified.
- the maximum count value at the time of data writing is smaller than the maximum count value at the time of data reading, it is possible to improve the data writing processing speed in the semiconductor memory device 10.
- data writing takes time compared to data reading.
- the address specification process is not executed for the mask ROM array 102, which cannot write data.
- the data writing time can be shortened.
- the address designating process is also executed for the mask ROM array 10 2, so that desired data can be read from the EEPROM ROM array 10 1 and the mask ROM array 10 2.
- the improvement in the data write processing speed in the semiconductor memory device 10 becomes more conspicuous when the data and identification information are written into the EEPROM area 10 1 at the time of factory shipment.
- temporary identification information such as 1 1 1 is stored in the first 3 bits of the EEPROM area 1 0 1.
- the host computer transmits 1 1 1 as the operation code identification information to the semiconductor memory device 10 and starts writing data to the EE PROM array 1 0 1.
- the writing of data is completed by writing the identification information to the first row after writing to the second row and 16th row of the EE PROM array 10 1.
- data is written in 8-bit units from address 08H, and when data writing to address 78H (1st line 6) is completed, the address is 7FH (the number of input clock pulses is 1 2 8 Therefore, the address specified by the address counter 1 1 0 according to the next clock pulse input is 00H, which is the first address of the EEPROM array 1 0 1.
- the host computer outputs information to be written in the first line, for example, 8-bit data including identification information corresponding to the ink color and ink type to the semiconductor memory device 10. As a result, desired identification information is written in the first row of the EE PR OM array 10 1.
- the maximum count value of the address counter 1 1 0 is the mask ROM array 1 0 Since the maximum address is set to 2 (the number of logical addresses + the number of virtual addresses), data can be read up to the address B FH of the mask ROM array. Be started. (2)
- the ink cartridge is used as an application example, but the same effect can be obtained in the toner cartridge. In addition, the same effect can be obtained when applied to a medium storing currency equivalent information such as a prepaid card.
- the verify process in the above embodiment uses the 4-bit counter and internal oscillator 16 2 to latch into the existing data DE 1 and 8-bit latch register 170 that are latched in the 8-bit internal register 15 3 It may be executed in 8-bit units using the written DI1.
- the 1st byte write data DI released from the 8-bit latch register 1 70 to MS B in 1-bit units DI It may be executed by comparing 1 and 1 bit of existing data DE 1 read in 1-bit units from the first write-restricted row of the memory array 100 in MSB. In such a case, the increment controller 150 is not needed
- the present invention can also be applied to a case where only an EEPROM array 101 is provided.
- the final address of the predetermined line is set to the maximum count value, and the EE PROM Writing after a predetermined row in the array can be prevented, and the rewrite processing up to the predetermined row can be speeded up.
- 16-bit write data has been described as an example, but in addition to this, one row of the memory array 100, such as 24-bit length and 32-bit length, can be used.
- the present invention can be applied to data having a data length that is a multiple of the bit length, and the same effect can be obtained.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Read Only Memory (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0613773-3A BRPI0613773A2 (pt) | 2005-07-25 | 2006-07-21 | dispositivo de armazenamento semicondutor |
CN2006800272546A CN101228589B (zh) | 2005-07-25 | 2006-07-21 | 半导体存储装置 |
EP06781838A EP1914756A4 (en) | 2005-07-25 | 2006-07-21 | SEMICONDUCTOR MEMORY MODULE |
AU2006273264A AU2006273264A1 (en) | 2005-07-25 | 2006-07-21 | Semiconductor storage device |
CA002616350A CA2616350A1 (en) | 2005-07-25 | 2006-07-21 | Semiconductor memory device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005213982A JP4839714B2 (ja) | 2005-07-25 | 2005-07-25 | シーケンシャルアクセスメモリ |
JP2005-213982 | 2005-07-25 |
Publications (1)
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WO2007013568A1 true WO2007013568A1 (ja) | 2007-02-01 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/314927 WO2007013568A1 (ja) | 2005-07-25 | 2006-07-21 | 半導体記憶装置 |
Country Status (11)
Country | Link |
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US (1) | US7591524B2 (ja) |
EP (1) | EP1914756A4 (ja) |
JP (1) | JP4839714B2 (ja) |
KR (1) | KR20080030106A (ja) |
CN (1) | CN101228589B (ja) |
AU (1) | AU2006273264A1 (ja) |
BR (1) | BRPI0613773A2 (ja) |
CA (1) | CA2616350A1 (ja) |
RU (1) | RU2008106758A (ja) |
TW (1) | TW200713325A (ja) |
WO (1) | WO2007013568A1 (ja) |
Cited By (1)
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---|---|---|---|---|
JP2007035120A (ja) * | 2005-07-25 | 2007-02-08 | Seiko Epson Corp | シーケンシャルアクセスメモリ |
Families Citing this family (5)
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KR101081193B1 (ko) | 2009-10-15 | 2011-11-07 | 엘지이노텍 주식회사 | 반도체 발광소자 및 그 제조방법 |
KR101072034B1 (ko) | 2009-10-15 | 2011-10-10 | 엘지이노텍 주식회사 | 반도체 발광소자 및 그 제조방법 |
KR101014013B1 (ko) | 2009-10-15 | 2011-02-10 | 엘지이노텍 주식회사 | 반도체 발광소자 및 그 제조방법 |
CN107392291A (zh) * | 2017-06-16 | 2017-11-24 | 广州市智专信息科技有限公司 | 一种用于书本的rfid标签,相应的书本生产方法及书本 |
JP7314656B2 (ja) * | 2019-06-28 | 2023-07-26 | セイコーエプソン株式会社 | 液体吐出装置 |
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DE3880694D1 (de) | 1988-07-25 | 1993-06-03 | Siemens Ag | Anordnung fuer druckeinrichtungen zur ueberwachung von druckmedium enthaltenden vorratsbehaeltern. |
US5049898A (en) * | 1989-03-20 | 1991-09-17 | Hewlett-Packard Company | Printhead having memory element |
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JPH0423300A (ja) * | 1990-05-17 | 1992-01-27 | Toyo Commun Equip Co Ltd | シフトレジスタ |
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JP2001187457A (ja) * | 1998-11-26 | 2001-07-10 | Seiko Epson Corp | 印刷装置およびカートリッジ |
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-
2005
- 2005-07-25 JP JP2005213982A patent/JP4839714B2/ja not_active Expired - Fee Related
-
2006
- 2006-07-20 US US11/458,820 patent/US7591524B2/en not_active Expired - Fee Related
- 2006-07-21 EP EP06781838A patent/EP1914756A4/en not_active Withdrawn
- 2006-07-21 WO PCT/JP2006/314927 patent/WO2007013568A1/ja active Application Filing
- 2006-07-21 KR KR1020087004357A patent/KR20080030106A/ko not_active Application Discontinuation
- 2006-07-21 AU AU2006273264A patent/AU2006273264A1/en not_active Abandoned
- 2006-07-21 RU RU2008106758/09A patent/RU2008106758A/ru not_active Application Discontinuation
- 2006-07-21 BR BRPI0613773-3A patent/BRPI0613773A2/pt not_active IP Right Cessation
- 2006-07-21 CN CN2006800272546A patent/CN101228589B/zh not_active Expired - Fee Related
- 2006-07-21 CA CA002616350A patent/CA2616350A1/en not_active Abandoned
- 2006-07-21 TW TW095126784A patent/TW200713325A/zh unknown
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WO2001025017A1 (fr) * | 1999-10-04 | 2001-04-12 | Seiko Epson Corporation | Enregistreur a jet d'encre, dispositif semi-conducteur et dispositif tete d'enregistrement |
JP2002334592A (ja) * | 2001-05-09 | 2002-11-22 | Fujitsu Ltd | 内部カウンタを複数備えた半導体記憶装置、及び不揮発性半導体記憶装置 |
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JP2007035120A (ja) * | 2005-07-25 | 2007-02-08 | Seiko Epson Corp | シーケンシャルアクセスメモリ |
Also Published As
Publication number | Publication date |
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CN101228589A (zh) | 2008-07-23 |
CA2616350A1 (en) | 2007-02-01 |
RU2008106758A (ru) | 2009-09-10 |
KR20080030106A (ko) | 2008-04-03 |
JP2007035120A (ja) | 2007-02-08 |
US20070019497A1 (en) | 2007-01-25 |
US7591524B2 (en) | 2009-09-22 |
JP4839714B2 (ja) | 2011-12-21 |
EP1914756A1 (en) | 2008-04-23 |
BRPI0613773A2 (pt) | 2011-02-01 |
CN101228589B (zh) | 2011-05-11 |
TW200713325A (en) | 2007-04-01 |
AU2006273264A1 (en) | 2007-02-01 |
EP1914756A4 (en) | 2009-04-15 |
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