WO2022107670A1 - 半導体回路 - Google Patents
半導体回路 Download PDFInfo
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- WO2022107670A1 WO2022107670A1 PCT/JP2021/041395 JP2021041395W WO2022107670A1 WO 2022107670 A1 WO2022107670 A1 WO 2022107670A1 JP 2021041395 W JP2021041395 W JP 2021041395W WO 2022107670 A1 WO2022107670 A1 WO 2022107670A1
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- slave latch
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 191
- 238000012937 correction Methods 0.000 claims abstract description 82
- 230000015654 memory Effects 0.000 claims description 21
- 238000012546 transfer Methods 0.000 description 21
- 230000005415 magnetization Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000000630 rising effect Effects 0.000 description 8
- 230000000717 retained effect Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
- H03K3/356—Bistable circuits
- H03K3/3562—Bistable circuits of the master-slave type
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/027—Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
- H03K3/037—Bistable circuits
- H03K3/0372—Bistable circuits of the master-slave type
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
- G11C11/165—Auxiliary circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C29/38—Response verification devices
- G11C29/42—Response verification devices using error correcting codes [ECC] or parity check
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
- G11C11/161—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect details concerning the memory cell structure, e.g. the layers of the ferromagnetic memory cell
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/41—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming static cells with positive feedback, i.e. cells not needing refreshing or charge regeneration, e.g. bistable multivibrator or Schmitt trigger
- G11C11/413—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing, timing or power reduction
- G11C11/417—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing, timing or power reduction for memory cells of the field-effect type
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C2029/0411—Online error correction
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C5/00—Details of stores covered by group G11C11/00
- G11C5/14—Power supply arrangements, e.g. power down, chip selection or deselection, layout of wirings or power grids, or multiple supply levels
- G11C5/148—Details of power up or power down circuits, standby circuits or recovery circuits
Definitions
- This disclosure relates to semiconductor circuits.
- Electronic devices are desired to have low power consumption from the viewpoint of ecology.
- a technique called power gating in which power consumption is reduced by selectively stopping power supply to some circuits, is often used.
- power gating in which power consumption is reduced by selectively stopping power supply to some circuits, is often used.
- the circuit returns to the operating state before the power supply is stopped immediately after the power supply is restarted.
- One of the methods for realizing such a recovery operation in a short time is a method of incorporating a non-volatile memory in the circuit.
- the non-volatile memory include a magnetic tunnel junction (MTJ) element and the like.
- the semiconductor circuit having a built-in non-volatile memory is disclosed in, for example, the following Patent Documents 1 and 2.
- the semiconductor circuit according to one aspect of the present disclosure includes a non-volatile latch circuit that stores k-bit data and m-bit error correction data for k-bit data.
- the semiconductor circuit according to one aspect of the present disclosure is provided with a non-volatile latch circuit that stores k-bit data and m-bit error correction data for k-bit data.
- FIG. 1 shows an example of a functional block of the semiconductor circuit 1 according to the first embodiment of the present disclosure.
- the semiconductor circuit 1 is a circuit that stores information.
- data reading / writing is controlled by a control unit.
- the control unit writes information to the semiconductor circuit 1 based on, for example, a write command and write data supplied from the outside, and reads information from the semiconductor circuit 1 based on a read command supplied from the outside.
- the control unit controls the power supply to the semiconductor circuit 1 by turning on / off the power supply transistor, for example.
- the control unit turns on the power supply transistor and supplies the power supply voltage to the semiconductor circuit 1.
- the control unit turns off the power supply transistor. In the semiconductor circuit 1, power consumption can be reduced by such power gating.
- the semiconductor circuit 1 includes k first FF (Flip Flop) circuits 10 (10 (0), 10 (1), ..., 10 (k-1)) and m.
- the second FF circuit 20 (20 (0), 20 (1), ..., 20 (m-1)) is provided.
- the semiconductor circuit 1 further includes, for example, an ECC (Error-Correcting Code) encoder 30, an ECC decoder 40, and an output circuit 50, as shown in FIG.
- ECC Error-Correcting Code
- K-bit data D [k-1: 0] is input to the ECC encoder 30.
- the k-bit data D [k-1: 0] is data input to the semiconductor circuit 1 from the outside.
- the ECC encoder 30 encodes the input k-bit data D [k-1: 0].
- the ECC encoder 30 generates m-bit ECC parity data Dp [m-1: 0] based on k-bit data D [k-1: 0].
- the m-bit ECC parity data Dp [m-1: 0] is m-bit error correction data for the k-bit data D [k-1: 0].
- the ECC encoder 30 outputs the generated n-bit data signal Din [n-1: 0] to the k first FF circuits 10 and the m second FF circuits 20. Specifically, the ECC encoder 30 outputs the k-bit data signal Din [k-1: 0] to the k first FF circuits 10, and the m-bit data signal Din [n-1: k] is m. Output to the second FF circuit 20.
- a k-bit data signal Din [k-1: 0], a clock signal CLK, and a control signal SR are input to the k first FF circuits 10.
- the k first FF circuits 10 store the input k-bit data signal Din [k-1: 0].
- a 1-bit data signal, a clock signal CLK, and a control signal SR of the k-bit data signal Din [k-1: 0] are input to each first FF circuit 10.
- Each first FF circuit 10 stores a 1-bit data signal of the k-bit data signal Din [k-1: 0]. From the k first FF circuits 10, k-bit data (data signal Dout [k-1: 0]) is output to the ECC decoder 40.
- a 1-bit data signal of the k-bit data signal Dout [k-1: 0] is output.
- the clock signal CLK is a signal for controlling the operation of the first FF circuit 10.
- the control signal SR is a signal for controlling the data store and the data restore.
- the first FF circuit 10 samples data at the rising timing of the clock signal CLK, and holds the data in a period other than that timing.
- the first FF circuit 10 has, for example, a master latch circuit 10M and a slave latch circuit 10S, as shown in FIG.
- the master latch circuit 10M holds or transmits data based on the clock signal CLK.
- the master latch circuit 10M executes a predetermined logical operation on the clock signal CLK and the data signal. Based on the execution result of the logical operation, the master latch circuit 10M holds the data signal captured in the latch when the clock signal CLK is high level Hi, and outputs the data signal to the slave latch circuit 10S as an output signal QM. On the other hand, when the clock signal CLK is low level Lo, the master latch circuit 10M transmits the data signal and outputs the output signal QM to the slave latch circuit 10S.
- the slave latch circuit 10S has a SRAM (Static Random Access Memory) circuit that holds or transmits data based on the clock signal CLK.
- the SRAM circuit stores one bit of data by positive feedback.
- the slave latch circuit 10S executes a predetermined logical operation on the clock signal CLK and the output signal QM.
- the slave latch circuit 10S is based on the execution result of the logic calculation, and when the clock signal CLK is high level Hi, the signal transmitted through the output signal QM (output signal QS1) and the signal inverted from the output signal QM (output signal QS2). Is output to the ECC decoder 40.
- the slave latch circuit 10S holds the output signal QS captured in the latch and outputs the output signals QS1 and QS2 to the ECC decoder 40.
- the m-bit data signal Din [n-1: k], the clock signal CLK, and the control signal SR are input to the m second FF circuits 20.
- the m-bit data signal Din [n-1: k] is m-bit error correction data for k-bit data D [k-1: 0] (m-bit ECC parity data Dp [m-1: 0]). Is.
- the m second FF circuits 20 store the input m-bit data signal Din [n-1: k].
- a 1-bit data signal, a clock signal CLK, and a control signal SR of the m-bit data signal Din [n-1: k] are input to each second FF circuit 20.
- Each second FF circuit 20 stores a 1-bit data signal of the m-bit data signal Din [n-1: k]. From the m second FF circuits 20, m-bit data (data signal Dout [n-1: k]) is output to the ECC decoder 40. From each second FF circuit 20, a data signal of 1 bit of the m-bit data signal Dout [n-1: k] is output.
- the clock signal CLK is a signal for controlling the operation of the second FF circuit 20.
- the second FF circuit 20 samples the data at the rising timing of the clock signal CLK, and holds the data in a period other than that timing.
- the second FF circuit 20 has, for example, a master latch circuit 20M and a slave latch circuit 20S, as shown in FIG.
- the master latch circuit 20M holds or transmits data based on the clock signal CLK.
- the master latch circuit 20M executes a predetermined logical operation on the clock signal CLK and the data signal. Based on the execution result of the logical operation, the master latch circuit 20M holds the data signal captured in the latch when the clock signal CLK is high level Hi, and outputs the data signal to the slave latch circuit 20S as an output signal QM. On the other hand, when the clock signal CLK is low level Lo, the master latch circuit 20M transmits the data signal and outputs the output signal QM to the slave latch circuit 20S.
- the slave latch circuit 20S has a SRAM circuit that holds or transmits data based on the clock signal CLK.
- the slave latch circuit 20S executes a predetermined logical operation on the clock signal CLK and the output signal QM.
- the slave latch circuit 10S outputs a signal (output signal QS2) in which the output signal QM is inverted to the ECC decoder 40 when the clock signal CLK is high level Hi based on the execution result of the logical operation.
- the slave latch circuit 20S holds the output signal QM captured in the latch and outputs the output signal QS2 to the ECC decoder 40.
- the slave latch circuits 10S and 20S have, for example, a transfer transistor Tr1 and a storage element MC1 as shown in FIGS. 2 and 3.
- the storage element MC1 is connected to the node N1 to which the wiring to which the output signal QS2 is output is connected via the transfer transistor Tr1.
- the node N1 corresponds to the previous stage portion in the SRAM circuit.
- the transfer transistor Tr1 is a transistor that turns on and off based on the control signal SR.
- the storage element MC1 holds the data of the node N1 (store). The data held in the storage element MC1 is transferred to the node N1 via the transfer transistor Tr1 (restoration).
- the slave latch circuits 10S and 20S further include, for example, a transfer transistor Tr2 and a storage element MC2 as shown in FIGS. 2 and 3.
- the storage element MC2 is connected to the node N2 to which the wiring to which the output signal QS1 is output is connected via the transfer transistor Tr2.
- the node N2 corresponds to the latter part of the SRAM circuit.
- the transfer transistor Tr2 is a transistor that turns on and off based on the control signal SR.
- the storage element MC2 holds the data of the node N2 (store). The data held in the storage element MC2 is transferred to the node N2 via the transfer transistor Tr2 (restoration). That is, the slave latch circuits 10S and 20S are non-volatile slave latch circuits capable of storing the data of the nodes N1 and N2 and restoring the stored data to the nodes N1 and N2.
- the storage elements MC1 and MC2 are non-volatile memories, and in this example, the spin injection magnetization reversal type (STT; Spin Transfer Torque) that stores information by changing the direction of the magnetization of the free layer by spin injection. It is a magnetic tunnel junction (MTJ) element.
- STT spin injection magnetization reversal type
- MTJ magnetic tunnel junction
- the memory elements MC1 and MC2 have a pinned layer, a tunnel barrier layer, and a free layer.
- the free layer is connected to the transfer transistors Tr1 and Tr2.
- the pinned layer is connected to the control line CTRL. That is, the memory elements MC1 and MC2 have a so-called top pin structure in which a pinned layer, a tunnel barrier layer, and a free layer are laminated in this order.
- the pinned layer is composed of a ferromagnet whose magnetization direction is fixed, for example, in the direction perpendicular to the film surface.
- the free layer is composed of a ferromagnet whose magnetization direction changes, for example, in the direction perpendicular to the film surface, depending on the inflowing spin polarization current.
- the tunnel barrier layer functions to break the magnetic bond between the pinned layer and the free layer and to carry the tunnel current.
- the storage elements MC1 and MC2 for example, when a current is passed from the free layer to the pinned layer, polarized electrons having a moment (spin) in the same direction as the magnetization of the pinned layer are injected from the pinned layer to the free layer.
- the direction of magnetization of the free layer is the same as the direction of magnetization of the pinned layer (parallel state).
- the resistance value between both ends becomes low (low resistance state).
- the resistance state changes between the high resistance state and the low resistance state by changing the magnetization direction of the free layer according to the direction in which the current flows.
- the storage elements MC1 and MC2 can store information by setting the resistance state in this way.
- transfer transistors Tr1 and Tr2 and storage elements MC1 and MC2 are provided in addition to the SRAM circuit.
- the information stored in the SRAM circuit which is a volatile memory
- the semiconductor circuit 1 can store the information stored in the storage elements MC1 and MC2 in the SRAM circuit by performing the restore operation immediately after the sleep operation.
- the state of the semiconductor circuit 1 can be returned to the state before the power supply is stopped in a short time.
- K-bit data (data signal Dout [k-1: 0]) is input to the ECC decoder 40 from the k first FF circuits 10, and m-bit data (data) is input from the m second FF circuits 20.
- the signal Dout [n-1: k]) is input.
- the ECC decoder 40 performs decoding using the input n-bit data (data signal Dout [n-1: 0]).
- the ECC decoder 40 has k-bit data (data signal Dout [k]) in the data signal Dout [n-1: 0] excluding the m-bit ECC parity data (data signal Dout [n-1: k]). -1: 0]) is decoded using the m-bit ECC parity data (data signal Dout [n-1: k]).
- the ECC decoder 40 outputs the k-bit data obtained by decoding as k-bit data D [k-1: 0] to the output circuit 50.
- error correction code by decoding for example, various error correction codes such as a Hamming code, a BCH code, their expanded code (extended code), an odd weighted string code, an Hsiao code, and an RS code can be applied.
- error correction codes such as a Hamming code, a BCH code, their expanded code (extended code), an odd weighted string code, an Hsiao code, and an RS code.
- a Hamming code a BCH code
- their expanded code extended code
- an odd weighted string code an odd weighted string code
- Hsiao code an RS code
- the k-bit data D [k-1: 0] is input from the ECC decoder 40 to the output circuit 50.
- the output circuit 50 outputs, for example, data obtained by inverting the input k-bit data D [k-1: 0] to the outside as output data Q [k-1: 0].
- FIG. 4 shows an example of the timing chart of the store operation in the semiconductor circuit 1.
- FIG. 5 shows an example of the timing chart of the restore operation in the semiconductor circuit 1.
- k-bit data D [k-1: 0] is input to the semiconductor circuit 1
- n-bit data (data signal Dout [n-1: 0]) obtained by ECC coding is input.
- An example of storing in n-bit FF circuits (k first FF circuits 10 and m second FF circuits 20) is shown.
- FIG. 5 shows an example of error correction by ECC decoding after restoration.
- N1 [n-1: 0] is coded data input to the node N1 of n slave latch circuits (k slave latch circuits 10S and m slave latch circuits 20S). Is.
- N2 [n-1: 0] is data input to the node N2 of n slave latch circuits (k slave latch circuits 10S and m slave latch circuits 20S).
- N1 [n-1: 0] is inverted data.
- Q [k-1: 0] is k-bit data output from the semiconductor circuit 1.
- the suffixes in FIGS. 4 and 5 indicate a time series.
- the k-bit data D [k-1: 0] input from the outside changes at the rising edge of the clock signal CLK.
- the k master latch circuits 10M latch the k-bit data D [k-1: 0] at the rising edge of the signal in which the clock signal CLK is inverted.
- the k-bit data latched by the k master latch circuits 10M becomes n-bit data (encoded data) by ECC coding.
- N slave latch circuits (k slave latch circuits 10S and m slave latch circuits 20S) latch n-bit coded data N1 [n-1: 0] at the rising edge of the next clock signal CLK. ..
- the n-bit coded data N1 [n-1: 0] latched by the n slave latch circuits becomes k-bit data Q [k-1: 0] (decoded data) by ECC decoding.
- the k-bit data Q [k-1: 0] (decrypted data) is output to the outside.
- the coded data is stored in the storage element MC1 by changing the resistance states of the storage elements MC1 and MC2 by the control signals SR and CTRL from the control unit, and the coded data is inverted in the storage element MC2.
- the data (inverted data) is recorded, and the data is held in the storage elements 11 and 13 even after the power is turned off.
- the restore operation after the power is turned on, the voltage of the nodes N1 and N2 is determined according to the resistance state of the storage elements MC1 and MC2 by the control signals SR and CTRL from the control unit. Encoded data is restored to node N1 and inverted data is restored to node N2.
- the data restored to the node N1 may be different from the data at the time of storage due to a defect or recording state of the storage elements MC1 and MC2.
- ECC decoding is performed on the restored n-bit data to obtain k-bit data in which the error is corrected.
- FIGS. 4 and 5 ECC coding and ECC decoding are assumed to be completed within one clock cycle.
- FIG. 6 shows an example of a timing chart for one bit in the store operation shown in FIG.
- FIG. 7 shows an example of a timing chart for one bit in the restore operation shown in FIG.
- the store operation data is stored in the storage elements MC1 and MC2 by changing the resistance state of the storage elements MC1 and MC2 by the voltage of the nodes N1 and N2.
- the restore operation the voltage of the nodes N1 and N2 is determined according to the resistance state of the storage elements MC1 and MC2.
- k first FF circuits 10 and m second FF circuits 20 for storing k-bit data and m-bit error correction data for k-bit data are provided.
- k first FF circuits 10 and m second FF circuits 20 for storing k-bit data and m-bit error correction data for k-bit data are provided.
- the first FF circuit 10 composed of k master latch circuits 10M and k slave latch circuits 10S, and m master latch circuits 20M and m slave latch circuits 20S are configured.
- a second FF circuit 20 is provided.
- the k slave latch circuits 10S store k-bit data
- the m slave latch circuits 20S store m-bit error correction data.
- the ECC encoder 30 that generates m-bit error correction data is provided, and the m-bit error correction data generated by the ECC encoder 30 is stored in the m slave latch circuits 20S. To. As a result, even if the stored data becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. Therefore, it is possible to provide the semiconductor circuit 1 having high error tolerance.
- an ECC decoder is provided that decodes the k-bit data output from the k slave latch circuits 10S by using the m-bit error correction data output from the m slave latch circuits 20S. ing.
- the slave latch circuits 10S and 20S are provided with non-volatile storage elements MC1 and MC2 for holding 1-bit data.
- the storage elements MC1 and MC2 becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. It is possible. Therefore, it is possible to provide the semiconductor circuit 1 having high error tolerance.
- FIG. 8 shows an example of a functional block of the semiconductor circuit 2 according to the second embodiment of the present disclosure.
- the semiconductor circuit 2 is a circuit that stores information.
- data reading / writing is controlled by a control unit.
- the control unit writes information to the semiconductor circuit 2 based on, for example, a write command and write data supplied from the outside, and reads information from the semiconductor circuit 2 based on a read command supplied from the outside.
- the control unit controls the power supply to the semiconductor circuit 2 by turning on / off the power supply transistor, for example.
- the control unit turns on the power supply transistor and supplies the power supply voltage to the semiconductor circuit 2.
- the control unit turns off the power supply transistor. In the semiconductor circuit 2, power consumption can be reduced by such power gating.
- the semiconductor circuit 2 includes, for example, k first FF circuits 10 and m slave latch circuits 20S, as shown in FIG.
- the semiconductor circuit 2 further includes, for example, an ECC encoder 30, an ECC decoder 40, and an output circuit 50, as shown in FIG. That is, the semiconductor circuit 2 has a circuit configuration in which the m master latch circuits 20M are omitted in the semiconductor circuit 1.
- the ECC encoder 30 is provided between the k master latch circuits 10M and the k slave latch circuits 10S. In the present embodiment, the output terminals of the ECC encoder 30 are further directly connected to the input terminals of the m slave latch circuits 20S.
- the ECC encoder 30 has an output terminal of the master latch circuit 10M (1) and an input terminal of the three slave latch circuits 10S (1), 20S (1), 20S (2). It consists of wiring that connects to and from each other.
- the ECC decoder 40 has three adders and one AND circuit. The first adder inputs the first signal obtained by adding the outputs of the slave latch circuits 10S (1) and 20S (1) to one input terminal of the AND circuit.
- the second adder inputs the second signal obtained by adding the outputs of the slave latch circuits 10S (1) and 20S (2) to the other input terminal of the AND circuit.
- the AND circuit produces a logical product of the first signal and the second signal.
- the third adder outputs the signal obtained by adding the logical product generated by the AND circuit and the output of the slave latch circuit 10S (1) to the output circuit 50.
- an error is made. It is corrected and the correct data is output.
- the ECC encoder 30 has four master latch circuits 10M (10M (0), 10M (1), 10M (2), 10M (3)) output terminals and four. It has a wiring for connecting to the input terminals of the slave latch circuit 10S (10S (0), 10S (1), 10S (2), 10S (3)) of the above.
- the ECC encoder 30 further has three adders.
- the first adder uses the slave latch circuit 20S (0) as a signal obtained by adding the outputs of three master latch circuits 10M (10M (0), 10M (1), 10M (2)). Output to.
- the second adder uses the signal obtained by adding the outputs of the three master latch circuits 10M (10M (1), 10M (2), 10M (3)) to the slave latch circuit 20S (1). Output to.
- the third adder uses the slave latch circuit 20S (2) to input the signal obtained by adding the outputs of the three master latch circuits 10M (10M (0), 10M (2), 10M (3)). Output to.
- the ECC decoder 40 includes seven adders, three inverter circuits, and four AND circuits.
- the first adder uses the first signal obtained by adding the outputs of the slave latch circuits 10S (0), 10S (1), 10S (2), and 20S (0) as the first inverter circuit. And input to the second, third and fourth AND circuits.
- the second adder uses the second signal obtained by adding the outputs of the slave latch circuits 10S (1), 10S (2), 10S (3), and 20S (1) as the second inverter circuit. And input to the first, second and third AND circuits.
- the third adder uses the third signal obtained by adding the outputs of the slave latch circuits 10S (0), 10S (2), 10S (3), and 20S (2) as the third inverter circuit. And input to the first, second and fourth AND circuits.
- the first inverter circuit inputs a signal obtained by inverting the first signal (first inverted signal) to the first AND circuit.
- the second inverter circuit inputs a signal obtained by inverting the second signal (second inverted signal) to the fourth AND circuit.
- the third inverter circuit inputs a signal obtained by inverting the third signal (third inverted signal) to the third AND circuit.
- the first AND circuit inputs the AND of the second signal, the third signal and the first inverting signal to the fourth adder.
- the second AND circuit inputs the AND of the first signal, the second signal and the third signal to the fifth adder.
- the third AND circuit inputs the AND of the first signal, the second signal and the third inverted signal to the sixth adder.
- the fourth AND circuit inputs the AND of the first signal, the second inverted signal and the third signal to the seventh adder.
- the fourth adder outputs a signal obtained by adding the output of the slave latch circuit 10S (3) and the output of the first AND circuit to the output circuit 50.
- the fifth adder outputs a signal obtained by adding the output of the slave latch circuit 10S (2) and the output of the second AND circuit to the output circuit 50.
- the sixth adder outputs a signal obtained by adding the output of the slave latch circuit 10S (1) and the output of the third AND circuit to the output circuit 50.
- the seventh adder outputs a signal obtained by adding the output of the slave latch circuit 10S (0) and the output of the fourth AND circuit to the output circuit 50.
- the output circuit 50 outputs a signal obtained by inverting the signal input from the ECC decoder 40 to the outside as an output signal Q.
- k first FF circuits 10 and m slave latch circuits 20S for latching k-bit data and m-bit error correction data for k-bit data are provided.
- k first FF circuits 10 and m slave latch circuits 20S for latching k-bit data and m-bit error correction data for k-bit data are provided.
- the first FF circuit 10 composed of k master latch circuits 10M and k slave latch circuits 10S, and m slave latch circuits 20S are provided.
- the k slave latch circuits 20S store k-bit data
- the m slave latch circuits 20S store m-bit error correction data.
- the ECC encoder 30 that generates m-bit error correction data is provided, and the m-bit error correction data generated by the ECC encoder 30 is stored in the m slave latch circuits 20S. To. As a result, even if the stored data becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. Therefore, it is possible to provide the semiconductor circuit 2 having high error tolerance.
- the ECC decoder 40 is provided to decode the k-bit data output from the k slave latch circuits 10S by using the m-bit error correction data output from the m slave latch circuits 20S. Has been done. As a result, even if the stored data becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. Therefore, it is possible to provide the semiconductor circuit 2 having high error tolerance.
- the slave latch circuits 10S and 20S are provided with non-volatile storage elements MC1 and MC2 for holding 1-bit data.
- the storage elements MC1 and MC2 becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. It is possible. Therefore, it is possible to provide the semiconductor circuit 2 having high error tolerance.
- FIG. 11 shows an example of a functional block of the semiconductor circuit 3 according to the third embodiment of the present disclosure.
- the semiconductor circuit 3 is a circuit that stores information.
- data reading / writing is controlled by a control unit.
- the control unit writes information to the semiconductor circuit 3 based on, for example, a write command and write data supplied from the outside, and reads information from the semiconductor circuit 3 based on a read command supplied from the outside.
- the control unit controls the power supply to the semiconductor circuit 3 by turning on / off the power supply transistor, for example.
- the power supply transistor is turned on and the power supply voltage is supplied to the semiconductor circuit 3.
- the control unit turns off the power supply transistor. In the semiconductor circuit 3, power consumption can be reduced by such power gating.
- the semiconductor circuit 3 includes, for example, k FF circuits 60 (60 (0), 60 (1), ..., 60 (k-1)) and m slave latch circuits 70S, as shown in FIG. (70S (0), 70S (1), ..., 70S (m-1)).
- the semiconductor circuit 3 further includes, for example, an ECC encoder 80, an ECC decoder 90, and an output circuit 50, as shown in FIG.
- a k-bit data signal Din [k-1: 0], a clock signal CLK, and a control signal SR are input to the k FF circuits 60.
- a 1-bit data signal, a clock signal CLK, and a control signal SR of the k-bit data signal Din [k-1: 0] are input to each FF circuit 60.
- k-bit data data signal Dout [k-1: 0]
- the clock signal CLK is a signal for controlling the operation of the FF circuit 60.
- the control signal SR is a signal for controlling the data store and the data restore.
- the FF circuit 60 samples data at the rising timing of the clock signal CLK, and holds the data in a period other than that timing.
- the FF circuit 60 has, for example, a master latch circuit 60M and a slave latch circuit 60S, as shown in FIG.
- the master latch circuit 60M holds or transmits data based on the clock signal CLK.
- the master latch circuit 60M executes a predetermined logical operation on the clock signal CLK and the data signal. Based on the execution result of the logical operation, the master latch circuit 60M holds the data signal captured in the latch when the clock signal CLK is high level Hi, and outputs the output signal QM to the slave latch circuit 10S and the ECC encoder 80. .. On the other hand, when the clock signal CLK is low level Lo, the master latch circuit 60M transmits the data signal and outputs it as an output signal QM to the slave latch circuit 60S and the ECC encoder 80.
- the slave latch circuit 60S has a SRAM circuit that holds or transmits data based on the clock signal CLK.
- the slave latch circuit 60S executes a predetermined logical operation on the clock signal CLK and the output signal QM.
- the slave latch circuit 60S outputs a signal (output signal QS2) in which the output signal QM is inverted to the ECC decoder 40 and the output circuit 50 when the clock signal CLK is high level Hi based on the execution result of the logical operation.
- the slave latch circuit 60S holds the output signal QS captured in the latch and outputs the output signal QS2 to the ECC decoder 40 and the output circuit 50.
- a k-bit output signal QM (data D [k-1: 0]) is input to the ECC encoder 80.
- the ECC encoder 80 encodes the input output signal QM (data D [k-1: 0]).
- the ECC encoder 80 generates m-bit ECC parity data based on the output signal QM (data D [k-1: 0]).
- the ECC encoder 80 outputs the generated m-bit ECC parity data Dp [m-1: 0] to m slave latch circuits 70S.
- m-bit ECC parity data Dp [m-1: 0] are input to the m slave latch circuits 70S.
- a 1-bit data signal, a clock signal CLK, and a control signal SR of the m-bit ECC parity data Dp [m-1: 0] are input to each slave latch circuit 70S.
- m-bit ECC parity data Dp [m-1: 0] is output to the ECC decoder 90 as a data signal Dout [n-1: k].
- a data signal of 1 bit of the m-bit data signal Dout [n-1: k] is output.
- the clock signal CLK is a signal for controlling the operation of the slave latch circuit 70S.
- the slave latch circuit 70S samples data at the rising timing of the clock signal CLK, and holds the data in a period other than that timing.
- the slave latch circuits 60S and 70S have, for example, a transfer transistor Tr1 and a storage element MC1 as shown in FIGS. 12 and 13.
- the storage element MC1 is connected to the node N1 via the transfer transistor Tr1.
- the transfer transistor Tr1 is a transistor that turns on and off based on the control signal SR.
- the slave latch circuits 60S and 70S further include a transfer transistor Tr2 and a storage element MC2, for example, as shown in FIGS. 12 and 13.
- the storage element MC2 is connected to the node N2 via the transfer transistor Tr2.
- the transfer transistor Tr2 is a transistor that turns on and off based on the control signal SR.
- transfer transistors Tr1 and Tr2 and storage elements MC1 and MC2 are provided in addition to the SRAM circuit.
- the information stored in the SRAM circuit which is a volatile memory
- the semiconductor circuit 3 can store the information stored in the storage elements MC1 and MC2 in the SRAM circuit by performing the restore operation immediately after the sleep operation.
- the state of the semiconductor circuit 3 can be returned to the state before the power supply is stopped in a short time.
- the ECC decoder 90 has k-bit data (data signal Dout [k]) in the data signal Dout [n-1: 0] excluding the m-bit ECC parity data (data signal Dout [n-1: k]). -1: 0]) is decoded using the m-bit ECC parity data (data signal Dout [n-1: k]).
- the ECC decoder 90 outputs the k-bit data obtained by decoding to the k master latch circuits 60 as k-bit output data Dout [k-1: 0].
- k-bit output data Dout [k-1: 0] is input from k slave latches 60S.
- the output circuit 50 outputs, for example, data obtained by inverting the input k-bit output data Dout [k-1: 0] to the outside as output data Q [k-1: 0].
- the master latch circuit 60M further has a selection element SW, for example, as shown in FIG.
- the selection element SW selects either a signal in which the output signal QM is inverted or a signal input from the ECC decoder 90 according to control by the control unit.
- the signal selected by the selection element SW is held in the master latch circuit 60M.
- FIG. 14 shows an example of the timing chart of the restore operation in the semiconductor circuit 3.
- k-bit data D [k-1: 0] is input, and n-bit data obtained by ECC coding is stored in an n-bit slave latch circuit (storage elements MC1 and MC2).
- N1 is coded data input to the node N1 of n slave latch circuits (k slave latch circuits 60S and m slave latch circuits 70S).
- N2 is data input to the node N2 of n slave latch circuits (k slave latch circuits 60S and m slave latch circuits 70S), and is data obtained by inverting N1.
- Q is k-bit data output from the semiconductor circuit 3.
- the suffix in FIG. 14 indicates a time series.
- the store operation in the semiconductor circuit 3 is the same as the store operation in the semiconductor circuit 1 according to the first embodiment (see FIG. 4).
- the voltage of the nodes N1 and N2 is determined according to the resistance state of the storage elements MC1 and MC2 by the control signals SR and CTRL from the control unit.
- Encoded data is restored to node N1 and inverted data is restored to node N2.
- the data restored to the node N1 may be different from the data at the time of storage due to a defect or recording state of the storage elements MC1 and MC2.
- ECC decoding is performed on the restored n-bit data to obtain k-bit data in which the error is corrected.
- k FF circuits 60 and m slave latch circuits 70S for latching k-bit data and m-bit error correction data with respect to k-bit data are provided.
- k FF circuits 60 and m slave latch circuits 70S for latching k-bit data and m-bit error correction data with respect to k-bit data are provided.
- an FF circuit 60 composed of k master latch circuits 60M and k slave latch circuits 60S, and m slave latch circuits 70S are provided.
- the k slave latch circuits 60S store k-bit data
- the m slave latch circuits 70S store m-bit error correction data.
- the ECC encoder 80 which is connected in parallel with the k slave latch circuits 60S to the k master latch circuits 60 and generates m-bit error correction data, is provided, and m pieces are provided.
- the slave latch circuit 70 of the above m-bit error correction data generated by the ECC encoder 80 is stored. As a result, even if the stored data becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. Therefore, it is possible to provide the semiconductor circuit 3 having high error tolerance.
- an ECC decoder 90 is provided that decodes the k-bit data output from the k slave latch circuits 60S by using the m-bit error correction data output from the m slave latch circuits 70S. Has been done. As a result, even if the stored data becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. Therefore, it is possible to provide the semiconductor circuit 3 having high error tolerance.
- the slave latch circuits 60S and 70S are provided with non-volatile storage elements MC1 and MC2 for holding 1-bit data.
- the storage elements MC1 and MC2 becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. It is possible. Therefore, it is possible to provide the semiconductor circuit 3 having high error tolerance.
- the k master latch circuits 60 either the k-bit decoding data generated by decoding by the ECC decoder 90 or the k-bit data output from the k master latch circuits 60 is used. Selector SWs that feed back to the k master latch circuits 60 are provided. As a result, even if the data held in the storage elements MC1 and MC2 becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. It is possible. Therefore, it is possible to provide the semiconductor circuit 3 having high error tolerance.
- FIG. 15 shows an example of a functional block of the semiconductor circuit 4 according to the fourth embodiment of the present disclosure.
- the semiconductor circuit 4 is a circuit that stores information.
- the reading and writing of data is controlled by the control unit.
- the control unit writes information to the semiconductor circuit 4 based on, for example, a write command and write data supplied from the outside, and reads information from the semiconductor circuit 4 based on a read command supplied from the outside.
- the control unit controls the power supply to the semiconductor circuit 4, for example, by turning on and off the power supply transistor.
- the control unit turns on the power supply transistor and supplies the power supply voltage to the semiconductor circuit 4.
- the control unit turns off the power supply transistor. In the semiconductor circuit 4, power consumption can be reduced by such power gating.
- the semiconductor circuit 4 includes, for example, k FF circuits 110 (110 (0), 110 (1), ..., 110 (k-1)) and m slave latch circuits 70S, as shown in FIG. (70S (0), 70S (1), ..., 70S (m-1)).
- the semiconductor circuit 4 further includes, for example, selectors 120 and 130, an ECC encoder 80, an ECC decoder 90, and an output circuit 50, as shown in FIG.
- a k-bit data signal Din [k-1: 0], a clock signal CLK, and a control signal SR are input to the k FF circuits 110.
- a 1-bit data signal, a clock signal CLK, and a control signal SR of the k-bit data signal Din [k-1: 0] are input to each FF circuit 110.
- k-bit data data signal Dout [k-1: 0]
- the clock signal CLK is a signal for controlling the operation of the FF circuit 110.
- the control signal SR is a signal for controlling the data store and the data restore.
- the FF circuit 110 samples data at the rising timing of the clock signal CLK, and holds the data in a period other than that timing.
- the FF circuit 110 has, for example, a master latch circuit 10M and a slave latch circuit 60S, as shown in FIG.
- the master latch circuit 10M outputs the output signal QM to the slave latch circuit 60S via the selector 120 and outputs it to the ECC encoder 80.
- the slave latch circuit 60S outputs a signal (output signal QS2) in which the output signal QM is inverted to the ECC decoder 90 and the output circuit 50.
- the ECC encoder 80 outputs the generated m-bit ECC parity data Dp [m-1: 0] to the selector 130.
- the ECC decoder 90 outputs the k-bit data obtained by decoding to the selector 120 as k-bit output data Dout [k-1: 0].
- the ECC decoder 90 further outputs the m-bit ECC parity data Dp [m-1: 0] used for decoding to the selector 130.
- the selector 120 determines the output signal QM (data [k-1: 0]) input from the master latch circuit 10M and the output data Dout [k-1: 0] input from the ECC decoder 90 according to the control by the control unit. Select one of them.
- the selector 120 outputs the selected data to k slave latch circuits 60S.
- the selector 130 has either the ECC parity data Dp [m-1: 0] input from the ECC encoder 80 or the ECC parity data Dp [m-1: 0] input from the ECC decoder 90 according to the control by the control unit. Select one.
- the selector 130 outputs the selected data to m slave latch circuits 70S.
- FIG. 16 shows an example of a basic operation procedure in the semiconductor circuit 4.
- the semiconductor circuit 4 shifts from the FF operation (step S101) to the store operation (step S102), the sleep operation (step S103), and the restore operation (step S104), and then shifts to the FF operation (step S105) again.
- the semiconductor circuit 4 encodes a k-bit output signal QM (data D [k-1: 0]) using the ECC encoder 80 (step S201).
- the semiconductor circuit 4 stores m-bit ECC parity data Dp [m-1: 0] generated by encoding in m slave latch circuits 70S (step S202).
- the semiconductor circuit 4 stores the k-bit output signal QM (data D [k-1: 0]) in the k slave latch circuits 60S (step S202).
- the semiconductor circuit 4 restores the stored data and performs an ECC check (steps S203 and S204).
- step S205; N the semiconductor circuit 4 determines that the store operation has been performed normally, and ends the store operation. If there is an error in the restored data (step S205; Y), the semiconductor circuit 4 decodes the restored data using the ECC decoder 90 (step S206).
- the semiconductor circuit 4 stores the k-bit data obtained by decoding in the k slave latch circuits 60S via the selector 120 (step S207).
- the semiconductor circuit 4 stores m-bit ECC parity data Dp [m-1: 0] in m slave latch circuits 70S via the selector 130 (step S207). In this way, the semiconductor circuit 4 executes the store operation. After that, the power supply transistor is turned off by the control from the control unit, the supply of the power supply voltage to the semiconductor circuit 4 is stopped, and the sleep operation is started.
- the semiconductor circuit 4 confirms the stored data during the sleep operation.
- the power supply transistor is turned on, and the supply of the power supply voltage to the semiconductor circuit 4 is restarted.
- the semiconductor circuit 4 first restores the stored data and performs an ECC check (steps S301 and S302).
- the semiconductor circuit 4 determines that the store operation has been performed normally, and ends the operation for confirming the stored data.
- the power supply transistor is turned off by the control from the control unit, the supply of the power supply voltage to the semiconductor circuit 4 is stopped, and the sleep operation is started.
- the semiconductor circuit 4 decodes the restored data using the ECC decoder 90 (step S304).
- the semiconductor circuit 4 stores the k-bit data obtained by decoding in the k slave latch circuits 60S via the selector 120 (step S305).
- the semiconductor circuit 4 stores m-bit ECC parity data Dp [m-1: 0] in m slave latch circuits 70S via the selector 130 (step S305). In this way, the semiconductor circuit 4 executes an operation for confirming the stored data. After that, the power supply transistor is turned off by the control from the control unit, the supply of the power supply voltage to the semiconductor circuit 4 is stopped, and the sleep operation is performed again.
- the semiconductor circuit 4 returns from the sleep state to the FF operation. Specifically, first, the power supply transistor is turned on by the control from the control unit, and the supply of the power supply voltage to the semiconductor circuit 4 is restarted. Then, the semiconductor circuit 4 restores the stored data and performs an ECC check (steps S401 and S402). As a result, if there is no error in the restored data (step S403; N), the semiconductor circuit 4 determines that the restore operation has been performed normally, and restarts the FF operation. On the other hand, when there is an error in the restored data (step S403; Y), the semiconductor circuit 4 decodes the restored data using the ECC decoder 90 (step S404). The semiconductor circuit 4 outputs the data obtained by decoding.
- FIG. 17 shows another example of the basic operation procedure in the semiconductor circuit 4.
- the semiconductor circuit 4 may perform the pre-sleep inspection operation (step S106) instead of the store operation (step S102).
- the semiconductor circuit 4 encodes a k-bit output signal QM (data D [k-1: 0]) using the ECC encoder 80 (step S601).
- the semiconductor circuit 4 is divided into n-bit data consisting of m-bit ECC parity data Dp [m-1: 0] generated by encoding and k-bit output signal QM (data D [k-1: 0]).
- an ECC check is performed (step S602).
- step S603; N the semiconductor circuit 4 shifts to the sleep operation.
- step S603; Y if there is an error in the acquired k-bit data D [k-1: 0] (step S603; Y), it is confirmed whether or not the setting for re-storing (rewriting) is made. As a result, when the setting for re-storing (rewriting) is off (step S604; N), the semiconductor circuit 4 shifts to the sleep operation. On the other hand, when the setting for re-storing (rewriting) is on (step S604; Y), the semiconductor circuit 4 transfers the k-bit data obtained by decoding to k slave latches via the selector 120. Store in circuit 60S (step S605). The semiconductor circuit 4 stores m-bit ECC parity data Dp [m-1: 0] in m slave latch circuits 70S via the selector 130 (step S605). In this way, the semiconductor circuit 4 executes the pre-sleep inspection operation.
- k FF circuits 110 and m slave latch circuits 70S for latching k-bit data and m-bit error correction data with respect to k-bit data are provided.
- k FF circuits 110 and m slave latch circuits 70S for latching k-bit data and m-bit error correction data with respect to k-bit data are provided.
- the FF circuit 110 composed of k master latch circuits 10M and k slave latch circuits 60S, and m slave latch circuits 70S are provided.
- the k slave latch circuits 60S store k-bit data
- the m slave latch circuits 70S store m-bit error correction data.
- the ECC encoder 80 which is connected in parallel with the k slave latch circuits 60S to the k master latch circuits 10 and generates m-bit error correction data, is provided, and m pieces are provided.
- the slave latch circuit 70 of the above m-bit error correction data generated by the ECC encoder 80 is stored. As a result, even if the stored data becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. Therefore, it is possible to provide the semiconductor circuit 4 having high error tolerance.
- an ECC decoder 90 is provided that decodes the k-bit data output from the k slave latch circuits 60S by using the m-bit error correction data output from the m slave latch circuits 70S. Has been done. As a result, even if the stored data becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. Therefore, it is possible to provide the semiconductor circuit 4 having high error tolerance.
- the slave latch circuits 60S and 70S are provided with non-volatile storage elements MC1 and MC2 for holding 1-bit data.
- the storage elements MC1 and MC2 becomes erroneous data for some reason, it is possible to return to the operating state before the power supply is stopped with the correct data by error correction. It is possible. Therefore, it is possible to provide the semiconductor circuit 4 having high error tolerance.
- any one of the k-bit decoding data generated by decoding by the ECC decoder 90 and the k-bit data output from the k master latch circuits 10 is input to the k slave latch circuits 60S.
- a selector 120 is provided.
- k slave latch circuits are used in any one of the store operation, the sleep operation, and the restore operation.
- An ECC check is performed.
- the present disclosure may have the following structure.
- a semiconductor circuit including a non-volatile latch circuit that stores k-bit data and m-bit error correction data for the k-bit data.
- the non-volatile latch circuit includes k master latch circuits, k first non-volatile slave latch circuits, and m second non-volatile slave latch circuits.
- the k master latch circuits and the k first non-volatile slave latch circuits constitute k flip-flop circuits.
- the k first non-volatile slave latch circuits store the k bits of data.
- the semiconductor circuit according to (1), wherein the m second non-volatile slave latch circuits store the m-bit error correction data.
- An ECC encoder that generates m-bit error correction data is further provided between the k master latch circuits and the k first non-volatile slave latch circuits.
- the m-bit error correction data output from the m second non-volatile slave latch circuits is used to decode the k-bit data output from the k first non-volatile slave latch circuits.
- the non-volatile latch circuit includes k first master latch circuits, k first non-volatile slave latch circuits, m second master latch circuits, and m second non-volatile latch circuits. It is configured to include a slave latch circuit.
- the k first master latch circuits and the k first non-volatile slave latch circuits constitute k first flip-flop circuits.
- the m second master latch circuit and the m second non-volatile slave latch circuit constitute m second flip-flop circuits.
- the k first non-volatile slave latch circuits store the k bits of data.
- the semiconductor circuit according to (1), wherein the m second non-volatile slave latch circuits store the m-bit error correction data.
- the semiconductor circuit according to (5) wherein the m second non-volatile slave latch circuits store error correction data of the m bits generated by the ECC encoder. (7) Using the m-bit error correction data output from the m second non-volatile slave latch circuits, the k-bit data output from the k first non-volatile slave latch circuits is decoded.
- the k master latch circuits are further provided with an ECC encoder connected in parallel with the k first non-volatile slave latch circuits to generate the m-bit error correction data.
- the semiconductor circuit according to (2) wherein the m second non-volatile slave latch circuits store error correction data of the m bits generated by the ECC encoder.
- the k-bit data output from the k first non-volatile slave latch circuits is decoded.
- the semiconductor circuit according to (8) further comprising an ECC decoder.
- the k master latch circuits have a selector that feeds back any of the k-bit decoded data generated by decoding by the ECC decoder and the k-bit data to the k master latch circuits (9).
- each of the first non-volatile slave latch circuit and each of the second non-volatile slave latch circuits has a non-volatile memory for holding 1-bit data.
- the ECC decoder returns from the FF operation to the FF operation via the store operation, the sleep operation, and the restore operation, the k number of operations are performed in any one of the store operation, the sleep operation, and the restore operation.
- the non-volatile latch circuit for storing the k-bit data and the m-bit error correction data for the k-bit data is provided, it is held during sleep. Even if the data is reversed for some reason and becomes erroneous data, it is possible to return to the operating state before the power supply is stopped with the correct data by erroneous correction. Therefore, it is possible to provide a semiconductor circuit having high error tolerance.
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Abstract
Description
[構成]
図1は、本開示の第1の実施の形態に係る半導体回路1の機能ブロックの一例を表したものである。半導体回路1は、情報を記憶する回路である。半導体回路1では、制御部によってデータの読み書きが制御される。制御部は、例えば、外部から供給された書き込みコマンドおよび書き込みデータに基づいて、半導体回路1に情報を書き込み、また、外部から供給された読み出しコマンドに基づいて、半導体回路1から情報を読み出す。制御部は、例えば、電源トランジスタをオンオフすることにより、半導体回路1に対する電源供給を制御する。半導体回路1を使用する場合には、制御部は、電源トランジスタをオン状態にして、電源電圧を半導体回路1に供給する。半導体回路1を使用しない場合には、制御部は、電源トランジスタをオフ状態にする。半導体回路1では、このようなパワーゲーティングにより、消費電力を低減することができる。
図4は、半導体回路1におけるストア動作のタイミングチャートの一例を表したものである。図5は、半導体回路1におけるリストア動作のタイミングチャートの一例を表したものである。図4には、半導体回路1に、kビットのデータD[k-1:0]を入力し、ECC符号化により得られたnビットのデータ(データ信号Dout[n-1:0])をnビットのFF回路(k個の第1FF回路10およびm個の第2FF回路20)にストアする例が示されている。図5には、リストア後にECC復号により誤り訂正する例が示されている。
次に、本実施の形態に係る半導体回路1の効果について説明する。
[構成]
図8は、本開示の第2の実施の形態に係る半導体回路2の機能ブロックの一例を表したものである。半導体回路2は、情報を記憶する回路である。半導体回路2では、制御部によってデータの読み書きが制御される。制御部は、例えば、外部から供給された書き込みコマンドおよび書き込みデータに基づいて、半導体回路2に情報を書き込み、また、外部から供給された読み出しコマンドに基づいて、半導体回路2から情報を読み出す。制御部は、例えば、電源トランジスタをオンオフすることにより、半導体回路2に対する電源供給を制御する。半導体回路2を使用する場合には、制御部は、電源トランジスタをオン状態にして、電源電圧を半導体回路2に供給する。半導体回路2を使用しない場合には、制御部は、電源トランジスタをオフ状態にする。半導体回路2では、このようなパワーゲーティングにより、消費電力を低減することができる。
本実施の形態では、kビットのデータと、kビットのデータに対するmビットの誤り訂正データとをラッチするk個の第1FF回路10およびm個のスレーブラッチ回路20Sが設けられている。これにより、電源供給停止後、電源供給再開時に、電源供給停止前の動作状態に復帰することが可能である。また、電源供給停止の間(スリープ時)、保持されたデータが何らかの原因で誤ったデータになってしまった場合であっても、誤り訂正により正しいデータで、電源供給停止前の動作状態に復帰することが可能である。従って、エラー耐性の高い半導体回路2を提供することができる。
[構成]
図11は、本開示の第3の実施の形態に係る半導体回路3の機能ブロックの一例を表したものである。半導体回路3は、情報を記憶する回路である。半導体回路3では、制御部によってデータの読み書きが制御される。制御部は、例えば、外部から供給された書き込みコマンドおよび書き込みデータに基づいて、半導体回路3に情報を書き込み、また、外部から供給された読み出しコマンドに基づいて、半導体回路3から情報を読み出す。制御部は、例えば、電源トランジスタをオンオフすることにより、半導体回路3に対する電源供給を制御する。半導体回路3を使用する場合には、電源トランジスタをオン状態にして、電源電圧を半導体回路3に供給する。半導体回路3を使用しない場合には、制御部は、電源トランジスタをオフ状態にする。半導体回路3では、このようなパワーゲーティングにより、消費電力を低減することができる。
図14は、半導体回路3におけるリストア動作のタイミングチャートの一例を表したものである。図14には、kビットのデータD[k-1:0]を入力し、ECC符号化により得られたnビットのデータをnビットのスレーブラッチ回路(記憶素子MC1,MC2)にストアし、リストア後にECC復号により誤り訂正する例が示されている。図14において、N1は、n個のスレーブラッチ回路(k個のスレーブラッチ回路60Sおよびm個のスレーブラッチ回路70S)のノードN1に入力される符号化データである。図14において、N2は、n個のスレーブラッチ回路(k個のスレーブラッチ回路60Sおよびm個のスレーブラッチ回路70S)のノードN2に入力されるデータであり、N1を反転させたデータである。図14において、Qは、半導体回路3から出力されるkビットのデータである。図14におけるサフィックスは、時系列を示す。なお、半導体回路3におけるストア動作については、第1の実施の形態に係る半導体回路1におけるストア動作(図4参照)と同様である。
本実施の形態では、kビットのデータと、kビットのデータに対するmビットの誤り訂正データとをラッチするk個のFF回路60およびm個のスレーブラッチ回路70Sが設けられている。これにより、電源供給停止後、電源供給再開時に、電源供給停止前の動作状態に復帰することが可能である。また、電源供給停止の間(スリープ時)、保持されたデータが何らかの原因で誤ったデータになってしまった場合であっても、誤り訂正により正しいデータで、電源供給停止前の動作状態に復帰することが可能である。従って、エラー耐性の高い半導体回路3を提供することができる。
[構成]
図15は、本開示の第4の実施の形態に係る半導体回路4の機能ブロックの一例を表したものである。半導体回路4は、情報を記憶する回路である。半導体回路4では、制御部によってデータの読み書きが制御される。制御部は、例えば、外部から供給された書き込みコマンドおよび書き込みデータに基づいて、半導体回路4に情報を書き込み、また、外部から供給された読み出しコマンドに基づいて、半導体回路4から情報を読み出す。制御部は、例えば、電源トランジスタをオンオフすることにより、半導体回路4に対する電源供給を制御する。半導体回路4を使用する場合には、制御部は、電源トランジスタをオン状態にして、電源電圧を半導体回路4に供給する。半導体回路4を使用しない場合には、制御部は、電源トランジスタをオフ状態にする。半導体回路4では、このようなパワーゲーティングにより、消費電力を低減することができる。
次に、半導体回路4における動作について説明する。なお、半導体回路4におけるストア動作およびリストア動作については、半導体回路3と同様である。
半導体回路4は、まず、ECCエンコーダ80を用いて、kビットの出力信号QM(データD[k-1:0])をエンコードする(ステップS201)。半導体回路4は、エンコードにより生成されたmビットのECC パリティデータDp[m-1:0]をm個のスレーブラッチ回路70Sにストアする(ステップS202)。半導体回路4は、kビットの出力信号QM(データD[k-1:0])をk個のスレーブラッチ回路60Sにストアする(ステップS202)。半導体回路4は、ストアしたデータをリストアして、ECCチェックを行う(ステップS203,S204)。その結果、リストアしたデータにエラーがない場合(ステップS205;N)には、半導体回路4は、ストア動作が正常に行われたと判断して、ストア動作を終了する。リストアしたデータにエラーがある場合(ステップS205;Y)には、半導体回路4は、リストアしたデータを、ECCデコーダ90を用いてデコードする(ステップS206)。半導体回路4は、デコードにより得られたkビットのデータを、セレクタ120を介してk個のスレーブラッチ回路60Sにストアする(ステップS207)。半導体回路4は、mビットのECC パリティデータDp[m-1:0]を、セレクタ130を介してm個のスレーブラッチ回路70Sにストアする(ステップS207)。このようにして、半導体回路4は、ストア動作を実行する。その後、制御部からの制御によって、電源トランジスタがオフ状態となり、電源電圧の半導体回路4への供給が停止し、スリープ動作への移行がなされる。
半導体回路4は、スリープ動作中に、ストアしたデータの確認を行う。制御部からの制御によって、電源トランジスタがオン状態となり、電源電圧の半導体回路4への供給が再開される。すると、半導体回路4は、まず、ストアしたデータをリストアして、ECCチェックを行う(ステップS301,S302)。その結果、リストアしたデータにエラーがない場合(ステップS303;N)には、半導体回路4は、ストア動作が正常に行われたと判断して、ストアしたデータの確認のための動作を終了する。その後、制御部からの制御によって、電源トランジスタがオフ状態となり、電源電圧の半導体回路4への供給が停止し、スリープ動作への移行がなされる。
半導体回路4は、スリープ状態から、FF動作へ復帰する。具体的には、まず、制御部からの制御によって、電源トランジスタがオン状態となり、電源電圧の半導体回路4への供給が再開される。すると、半導体回路4は、ストアしたデータをリストアして、ECCチェックを行う(ステップS401,S402)。その結果、リストアしたデータにエラーがない場合(ステップS403;N)には、半導体回路4は、リストア動作が正常に行われたと判断して、FF動作を再開する。一方、リストアしたデータにエラーがある場合(ステップS403;Y)には、半導体回路4は、リストアしたデータを、ECCデコーダ90を用いてデコードする(ステップS404)。半導体回路4は、デコードにより得られたデータを出力する。
半導体回路4は、まず、ECCエンコーダ80を用いて、kビットの出力信号QM(データD[k-1:0])をエンコードする(ステップS601)。半導体回路4は、エンコードにより生成されたmビットのECC パリティデータDp[m-1:0]と、kビットの出力信号QM(データD[k-1:0])からなるnビットのデータに対して、ECCチェックを行う(ステップS602)。その結果、取得したkビットのデータD[k-1:0]にエラーがない場合(ステップS603;N)には、半導体回路4は、スリープ動作へ移行する。
本実施の形態では、kビットのデータと、kビットのデータに対するmビットの誤り訂正データとをラッチするk個のFF回路110およびm個のスレーブラッチ回路70Sが設けられている。これにより、電源供給停止後、電源供給再開時に、電源供給停止前の動作状態に復帰することが可能である。また、電源供給停止の間(スリープ時)、保持されたデータが何らかの原因で誤ったデータになってしまった場合であっても、誤り訂正により正しいデータで、電源供給停止前の動作状態に復帰することが可能である。従って、エラー耐性の高い半導体回路4を提供することができる。
(1)
kビットのデータと、前記kビットのデータに対するmビットの誤り訂正データとをストアする不揮発性ラッチ回路を備えた
半導体回路。
(2)
前記不揮発性ラッチ回路は、k個のマスターラッチ回路と、k個の第1の不揮発性スレーブラッチ回路と、m個の第2の不揮発性スレーブラッチ回路とを含んで構成され、
前記k個のマスターラッチ回路および前記k個の第1の不揮発性スレーブラッチ回路によってk個のフリップフロップ回路が構成され、
前記k個の第1の不揮発性スレーブラッチ回路が前記kビットのデータをストアし、
前記m個の第2の不揮発性スレーブラッチ回路が前記mビットの誤り訂正データをストアする
(1)に記載の半導体回路。
(3)
前記k個のマスターラッチ回路と前記k個の第1の不揮発性スレーブラッチ回路との間に、前記mビットの誤り訂正データを生成するECCエンコーダを更に備え、
前記m個の第2の不揮発性スレーブラッチ回路は、前記ECCエンコーダで生成された前記mビットの誤り訂正データをラッチする
(2)に記載の半導体回路。
(4)
前記m個の第2の不揮発性スレーブラッチ回路から出力される前記mビットの誤り訂正データを用いて、前記k個の第1の不揮発性スレーブラッチ回路から出力される前記kビットのデータを復号するECCデコーダを更に備えた
(3)に記載の半導体回路。
(5)
前記不揮発性ラッチ回路は、k個の第1のマスターラッチ回路と、k個の第1の不揮発性スレーブラッチ回路と、m個の第2のマスターラッチ回路と、m個の第2の不揮発性スレーブラッチ回路とを含んで構成され、
前記k個の第1のマスターラッチ回路および前記k個の第1の不揮発性スレーブラッチ回路によってk個の第1のフリップフロップ回路が構成され、
前記m個の第2のマスターラッチ回路および前記m個の第2の不揮発性スレーブラッチ回路によってm個の第2のフリップフロップ回路が構成され、
前記k個の第1の不揮発性スレーブラッチ回路が前記kビットのデータをストアし、
前記m個の第2の不揮発性スレーブラッチ回路が前記mビットの誤り訂正データをストアする
(1)に記載の半導体回路。
(6)
前記mビットの誤り訂正データを生成するECCエンコーダを更に備え、
前記m個の第2の不揮発性スレーブラッチ回路は、前記ECCエンコーダで生成された前記mビットの誤り訂正データをストアする
(5)に記載の半導体回路。
(7)
前記m個の第2の不揮発性スレーブラッチ回路から出力される前記mビットの誤り訂正データを用いて、前記k個の第1の不揮発性スレーブラッチ回路から出力される前記kビットのデータを復号するECCデコーダを更に備えた
(6)に記載の半導体回路。
(8)
前記k個のマスターラッチ回路に対して、前記k個の第1の不揮発性スレーブラッチ回路とともに並列に接続され、前記mビットの誤り訂正データを生成するECCエンコーダを更に備え、
前記m個の第2の不揮発性スレーブラッチ回路は、前記ECCエンコーダで生成された前記mビットの誤り訂正データをストアする
(2)に記載の半導体回路。
(9)
前記m個の第2の不揮発性スレーブラッチ回路から出力される前記mビットの誤り訂正データを用いて、前記k個の第1の不揮発性スレーブラッチ回路から出力される前記kビットのデータを復号するECCデコーダを更に備えた
(8)に記載の半導体回路。
(10)
前記k個のマスターラッチ回路は、前記ECCデコーダによる復号により生成されたkビットの復号データ、および前記kビットのデータのいずれかを当該k個のマスターラッチ回路にフィードバックするセレクタを有する
(9)に記載の半導体回路。
(11)
前記ECCデコーダによる復号により生成されたkビットの復号データ、および前記k個のマスターラッチ回路から出力された前記kビットのデータのいずれかを前記k個の第1の不揮発性スレーブラッチ回路に入力するセレクタを有する
(9)に記載の半導体回路。
(12)
各前記第1の不揮発性スレーブラッチ回路および各前記第2の不揮発性スレーブラッチ回路は、1ビットのデータを保持する不揮発性メモリを有する
(2)~(4)に記載の半導体回路。
(13)
各前記第1の不揮発性スレーブラッチ回路および各前記第2の不揮発性スレーブラッチ回路は、1ビットのデータを保持する不揮発性メモリを有する
(5)~(7)に記載の半導体回路。
(14)
各前記第1の不揮発性スレーブラッチ回路および各前記第2の不揮発性スレーブラッチ回路は、1ビットのデータを保持する不揮発性メモリを有する
(8)~(10)に記載の半導体回路。
(15)
前記ECCデコーダは、FF動作から、ストア動作、スリープ動作およびリストア動作を経てFF動作に復帰する際に、前記ストア動作、前記スリープ動作および前記リストア動作のいずれか1つの動作において、前記k個の第1の不揮発性スレーブラッチ回路の前記不揮発性メモリから読み出した前記kビットのデータと、前記m個の第2の不揮発性スレーブラッチ回路に設けられた前記不揮発性メモリから読み出した前記mビットの誤り訂正データを用いてECCチェックを行う
(8)~(10)に記載の半導体回路。
Claims (15)
- kビットのデータと、前記kビットのデータに対するmビットの誤り訂正データとをストアする不揮発性ラッチ回路を備えた
半導体回路。 - 前記不揮発性ラッチ回路は、k個のマスターラッチ回路と、k個の第1の不揮発性スレーブラッチ回路と、m個の第2の不揮発性スレーブラッチ回路とを含んで構成され、
前記k個のマスターラッチ回路および前記k個の第1の不揮発性スレーブラッチ回路によってk個のフリップフロップ回路が構成され、
前記k個の第1の不揮発性スレーブラッチ回路が前記kビットのデータをストアし、
前記m個の第2の不揮発性スレーブラッチ回路が前記mビットの誤り訂正データをストアする
請求項1に記載の半導体回路。 - 前記k個のマスターラッチ回路と前記k個の第1の不揮発性スレーブラッチ回路との間に、前記mビットの誤り訂正データを生成するECCエンコーダを更に備え、
前記m個の第2の不揮発性スレーブラッチ回路は、前記ECCエンコーダで生成された前記mビットの誤り訂正データをストアする
請求項2に記載の半導体回路。 - 前記m個の第2の不揮発性スレーブラッチ回路から出力される前記mビットの誤り訂正データを用いて、前記k個の第1の不揮発性スレーブラッチ回路から出力される前記kビットのデータを復号するECCデコーダを更に備えた
請求項3に記載の半導体回路。 - 前記不揮発性ラッチ回路は、k個の第1のマスターラッチ回路と、k個の第1の不揮発性スレーブラッチ回路と、m個の第2のマスターラッチ回路と、m個の第2の不揮発性スレーブラッチ回路とを含んで構成され、
前記k個の第1のマスターラッチ回路および前記k個の第1の不揮発性スレーブラッチ回路によってk個の第1のフリップフロップ回路が構成され、
前記m個の第2のマスターラッチ回路および前記m個の第2の不揮発性スレーブラッチ回路によってm個の第2のフリップフロップ回路が構成され、
前記k個の第1の不揮発性スレーブラッチ回路が前記kビットのデータをストアし、
前記m個の第2の不揮発性スレーブラッチ回路が前記mビットの誤り訂正データをストアする
請求項1に記載の半導体回路。 - 前記mビットの誤り訂正データを生成するECCエンコーダを更に備え、
前記m個の第2の不揮発性スレーブラッチ回路は、前記ECCエンコーダで生成された前記mビットの誤り訂正データをストアする
請求項5に記載の半導体回路。 - 前記m個の第2の不揮発性スレーブラッチ回路から出力される前記mビットの誤り訂正データを用いて、前記k個の第1の不揮発性スレーブラッチ回路から出力される前記kビットのデータを復号するECCデコーダを更に備えた
請求項6に記載の半導体回路。 - 前記k個のマスターラッチ回路に対して、前記k個の第1の不揮発性スレーブラッチ回路とともに並列に接続され、前記mビットの誤り訂正データを生成するECCエンコーダを更に備え、
前記m個の第2の不揮発性スレーブラッチ回路は、前記ECCエンコーダで生成された前記mビットの誤り訂正データをストアする
請求項2に記載の半導体回路。 - 前記m個の第2の不揮発性スレーブラッチ回路から出力される前記mビットの誤り訂正データを用いて、前記k個の第1の不揮発性スレーブラッチ回路から出力される前記kビットのデータを復号するECCデコーダを更に備えた
請求項8に記載の半導体回路。 - 前記k個のマスターラッチ回路は、前記ECCデコーダによる復号により生成されたkビットの復号データ、および前記kビットのデータのいずれかを当該k個のマスターラッチ回路にフィードバックするセレクタを有する
請求項9に記載の半導体回路。 - 前記ECCデコーダによる復号により生成されたkビットの復号データ、および前記k個のマスターラッチ回路から出力された前記kビットのデータのいずれかを前記k個の第1の不揮発性スレーブラッチ回路に入力するセレクタを有する
請求項9に記載の半導体回路。 - 各前記第1の不揮発性スレーブラッチ回路および各前記第2の不揮発性スレーブラッチ回路は、1ビットのデータを保持する不揮発性メモリを有する
請求項2に記載の半導体回路。 - 各前記第1の不揮発性スレーブラッチ回路および各前記第2の不揮発性スレーブラッチ回路は、1ビットのデータを保持する不揮発性メモリを有する
請求項5に記載の半導体回路。 - 各前記第1の不揮発性スレーブラッチ回路および各前記第2の不揮発性スレーブラッチ回路は、1ビットのデータを保持する不揮発性メモリを有する
請求項8に記載の半導体回路。 - 前記ECCデコーダは、FF動作から、ストア動作、スリープ動作およびリストア動作を経てFF動作に復帰する際に、前記ストア動作、前記スリープ動作および前記リストア動作のいずれか1つの動作において、前記k個の第1の不揮発性スレーブラッチ回路の前記不揮発性メモリから読み出した前記kビットのデータと、前記m個の第2の不揮発性スレーブラッチ回路に設けられた前記不揮発性メモリから読み出した前記mビットの誤り訂正データを用いてECCチェックを行う
請求項8に記載の半導体回路。
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JP2014006889A (ja) * | 2012-06-01 | 2014-01-16 | Semiconductor Energy Lab Co Ltd | 半導体装置及びその駆動方法 |
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