WO2014112509A1 - 出力信号生成装置、半導体装置および出力信号生成方法 - Google Patents
出力信号生成装置、半導体装置および出力信号生成方法 Download PDFInfo
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- 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
- G11C11/401—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 cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/4076—Timing circuits
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- 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
- G11C11/401—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 cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/4074—Power supply or voltage generation circuits, e.g. bias voltage generators, substrate voltage generators, back-up power, power control circuits
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- 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
- G11C11/401—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 cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4093—Input/output [I/O] data interface arrangements, e.g. data buffers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
- G11C7/1066—Output synchronization
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/081—Details of the phase-locked loop provided with an additional controlled phase shifter
- H03L7/0812—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used
- H03L7/0814—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used the phase shifting device being digitally controlled
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/081—Details of the phase-locked loop provided with an additional controlled phase shifter
- H03L7/0812—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used
- H03L7/0816—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used the controlled phase shifter and the frequency- or phase-detection arrangement being connected to a common input
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1006—Data managing, e.g. manipulating data before writing or reading out, data bus switches or control circuits therefor
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1015—Read-write modes for single port memories, i.e. having either a random port or a serial port
- G11C7/1039—Read-write modes for single port memories, i.e. having either a random port or a serial port using pipelining techniques, i.e. using latches between functional memory parts, e.g. row/column decoders, I/O buffers, sense amplifiers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
- G11C7/106—Data output latches
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1078—Data input circuits, e.g. write amplifiers, data input buffers, data input registers, data input level conversion circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/22—Read-write [R-W] timing or clocking circuits; Read-write [R-W] control signal generators or management
Definitions
- the present invention relates to an output signal generation device, a semiconductor device, and an output signal generation method, and more particularly to an output signal generation device, a semiconductor device, and an output signal generation method for generating an output signal based on an input signal.
- a synchronous memory that operates in synchronization with a clock signal is widely used.
- a DDR (Double Data Rate) type synchronous memory output data needs to be synchronized with an external clock signal. Therefore, a DLL (Delay Line Loop) for generating an internal clock signal synchronized with the external clock signal is required. ) The circuit is installed.
- the DLL circuit includes a counter circuit whose count value is updated based on the phase difference between the external clock signal and the internal clock signal, and a delay line that generates the internal clock signal by delaying the external clock signal based on the counter value of the counter circuit. And having.
- the counter value that is, the delay amount in the delay line, can realize data synchronization at the timing when the counter value is determined.
- the operating current of the output transistor changes due to power supply fluctuations as time elapses, the data output timing changes and data synchronization is lost. Therefore, it is known that the adjustment of the counter value is not completed once but intermittently.
- phase adjustment operation the operation of updating the count value of the counter circuit and delaying the external clock signal based on the updated counter value.
- Patent Document 1 describes a semiconductor device with a DLL circuit that reduces power consumption by suppressing execution of a phase adjustment operation with low necessity.
- the semiconductor device described in Patent Document 1 performs a phase adjustment operation when the power supply voltage fluctuates at a predetermined acceleration or higher.
- the output signal generator of the present invention is An output signal based on the input signal, and a phase adjustment unit capable of executing an adjustment operation for setting a phase difference between the input signal and the output signal to a predetermined value;
- a holding unit for holding a reference voltage;
- a comparison voltage generator for generating a comparison voltage depending on the power supply voltage;
- the phase adjustment unit performs the adjustment operation.
- a control unit that executes the reference voltage held in the holding unit according to the power supply voltage.
- the output signal generation method of the present invention includes: An output signal generation method performed by an output signal generation apparatus including a phase adjustment unit capable of executing an adjustment operation for generating an output signal based on an input signal and setting a phase difference between the input signal and the output signal to a predetermined value. And Hold the reference voltage in the holding part, Generate a comparison voltage that depends on the power supply voltage, When the comparison voltage and the reference voltage held in the holding unit are intermittently compared, and the result of the comparison satisfies a predetermined condition representing the fluctuation of the power supply voltage, the phase adjustment unit performs the adjustment operation. The reference voltage held in the holding unit is changed according to the power supply voltage.
- whether to perform the phase adjustment operation is determined according to the comparison result between the reference voltage and the comparison voltage, and when the phase adjustment operation is executed, the reference voltage is changed according to the power supply voltage. For this reason, the reference voltage compared with the comparison voltage can be updated to a value corresponding to the power supply voltage during the latest phase adjustment operation. Therefore, for example, when the power supply voltage is stabilized and the comparison voltage is stabilized after the latest phase adjustment operation, there is a possibility that the comparison result between the updated reference voltage and the comparison voltage does not satisfy the predetermined condition indicating the fluctuation of the power supply voltage. Get higher. Therefore, it is possible to suppress the execution of the phase adjustment operation with low necessity.
- phase adjustment circuit 107a It is the figure which showed the semiconductor device 100 of one Embodiment of this invention. It is the figure which showed the phase adjustment circuit 107a. It is the figure which showed the phase adjustment control circuit 107b. 4 is a timing chart for explaining operations of a phase adjustment circuit 107a and a phase adjustment control circuit 107b.
- FIG. 1 is a diagram showing a semiconductor device 100 according to an embodiment of the present invention.
- a RAM Random Access Memory
- the semiconductor device 100 includes a clock terminal group 101, a command terminal group 102, an address terminal group 103, a data input / output terminal group 104, and a power supply terminal group 105 as external terminals.
- the semiconductor device 100 includes a clock input circuit 106, an input / output clock generation unit 107, a command input circuit 108, a command decode circuit 109, a refresh control circuit 110, an address input circuit 111, and an address latch circuit 112.
- FIFO First-In First-Out
- the clock terminal group 101 receives external clock signals CK and / CK.
- a signal having “/” at the beginning of a signal name means an inverted signal of the corresponding signal or a low active signal. Therefore, external clock signal CK and external clock signal / CK are complementary signals.
- the clock input circuit 106 receives the external clock signals CK and / CK from the clock terminal group 101, and generates the internal clock signal ICLK using the external clock signals CK and / CK.
- the clock input circuit 106 outputs the internal clock signal ICLK to the input / output clock generation unit 107.
- the input / output clock generation unit 107 generates the input / output clock signal LCLK by adjusting the phase of the internal clock signal ICLK.
- the input / output clock generator 107 is an example of an output signal generator
- the internal clock signal ICLK is an example of an input signal
- the input / output clock signal LCLK is an example of an output signal.
- the input / output clock generator 107 includes a phase adjustment circuit 107a and a phase adjustment control circuit 107b.
- the phase adjustment circuit 107a is an example of a phase adjustment unit, for example, a DLL circuit.
- the phase adjustment circuit 107a generates an input / output clock signal LCLK based on the internal clock signal ICLK. Further, the phase adjustment circuit 107a can execute a phase adjustment operation for setting the phase difference between the internal clock signal ICLK and the input / output clock signal LCLK to a predetermined value.
- the phase adjustment control circuit 107b determines the adjustment timing at which the phase adjustment circuit 107a executes the phase adjustment operation.
- the phase adjustment control circuit 107b outputs an enable signal ENA to the phase adjustment circuit 107a at the adjustment timing.
- the enable signal ENA is an example of an adjustment signal.
- the phase adjustment circuit 107a performs a phase adjustment operation.
- the input / output clock signal LCLK generated by the phase adjustment circuit 107a is supplied to the FIFO circuit 117 and the input / output circuit 118.
- the FIFO circuit 117 and the input / output circuit 118 will be described later.
- the command terminal group 102 receives a command signal.
- the command signals are, for example, a row address strobe signal / RAS, a column address strobe signal / CAS, and a reset signal / RESET.
- the command input circuit 108 receives a command signal from the command terminal group 102 and outputs the command signal to the command decode circuit 109.
- the command input circuit 108 outputs a reset signal RESET to the phase adjustment circuit 107a and the phase adjustment control circuit 107b, and outputs an initial (initialization) signal INIT to the phase adjustment control circuit 107b.
- the command decode circuit 109 receives a command signal.
- the command decode circuit 109 generates an internal command signal by holding the command signal, decoding the command signal, counting the command signal, and the like.
- the command decode circuit 109 generates, for example, a refresh command, a write command, and a read command as internal command signals.
- the refresh control circuit 110 receives a refresh command from the command decode circuit 109. When the refresh control circuit 110 receives a refresh command, the refresh control circuit 110 supplies a refresh signal to the row decoder 115.
- the address terminal group 103 receives an address signal.
- the address input circuit 111 receives an address signal from the address terminal group 103 and outputs the address signal to the address latch circuit 112.
- the address latch circuit 112 receives an address signal from the address input circuit 111.
- the address latch circuit 112 outputs an address signal to the mode register 113 when setting the mode register 113.
- the address latch circuit 112 outputs a row address of the address signal to the row decoder 115 and outputs a column address of the address signal to the column decoder 116.
- the mode register 113 is a register in which operation parameters (for example, burst length or CAS latency) of the semiconductor device 100 are set.
- the mode register 113 receives the internal command signal from the command decode circuit 109 and the address signal from the address latch circuit 112, and sets an operation parameter specified based on the internal command signal and the address signal.
- the memory cell array 114 includes a plurality of word lines WL, a plurality of bit lines BL, and a plurality of memory cells MC. Each memory cell MC is specified by a word line WL and a bit line BL.
- the row decoder 115 receives a row address from the address latch circuit 112 and a write command or a read command from the command decode circuit 109. In addition, the row decoder 115 receives a refresh signal from the refresh control circuit 110.
- the row decoder 115 When the row decoder 115 receives a write command or a read command, the row decoder 115 selects a word line WL corresponding to the row address from the plurality of word lines WL in the memory cell array 114.
- a plurality of word lines WL and a plurality of bit lines BL intersect, and memory cells MC are arranged at the intersections.
- FIG. 1 only one word line WL, one bit line BL, and one memory cell MC are shown for simplicity of explanation.
- Each bit line BL is connected to a sense amplifier (not shown) corresponding to its own bit line BL.
- the row decoder 115 When the row decoder 115 receives the refresh signal, the row decoder 115 selects the word line WL corresponding to the row address from the plurality of word lines WL, and refreshes the memory cells MC corresponding to the selected word line WL. Perform a refresh.
- the column decoder 116 receives the column address from the address latch circuit 112 and the write command or read command from the command decode circuit 109.
- the column decoder 116 When the column decoder 116 receives the column address and the write command or the read command, the column decoder 116 selects a sense amplifier corresponding to the column address from the plurality of sense amplifiers.
- Data (read data) in the MC (hereinafter referred to as “selected memory cell”) is amplified by the sense amplifier selected by the column decoder 116, supplied to the FIFO circuit 117, and then supplied to the input / output circuit 118. Is done.
- the sense amplifier selected by the column decoder 116 writes the write data from the FIFO circuit 117 to the selected memory cell.
- the FIFO circuit 117 receives the input / output clock signal LCLK from the phase adjustment circuit 107a, and exchanges read data and write data between the memory cell array 114 and the input / output circuit 118 in synchronization with the input / output clock signal LCLK. I do.
- the data input / output terminal group 104 performs read data output and write data input.
- the data input / output terminal group 104 is connected to the input / output circuit 118.
- the input / output circuit 118 receives the input / output clock signal LCLK from the phase adjustment circuit 107a, and outputs read data to the data input / output terminal group 104 in synchronization with the input / output clock signal LCLK during the read operation.
- the power supply terminal group 105 receives the voltage VDD on the high potential side of the power supply voltage and the voltage VSS on the low potential side of the power supply voltage.
- the internal power supply generation circuit 119 receives the voltage VDD and the voltage VSS from the power supply terminal group 105 and generates internal power supply voltages such as the voltage VPP, the voltage VPERI, and the voltage VPERR. Note that the voltage VDD and the voltage VSS are also supplied to the phase adjustment control circuit 107b, the FIFO circuit 117, and the input / output circuit 118.
- phase adjustment circuit 107a Next, the phase adjustment circuit 107a will be described.
- FIG. 2 is a diagram showing the phase adjustment circuit 107a.
- the phase adjustment circuit 107 a includes a signal adjustment circuit 1, a replica circuit 2, a phase comparison circuit 3, an update timing generation circuit 4, and a counter circuit 5.
- the signal adjustment circuit 1 is, for example, a delay line, and generates the input / output clock signal LCLK by delaying the internal clock signal ICLK.
- a voltage VPERD is supplied to the signal adjustment circuit 1.
- the signal adjustment circuit 1 includes a coarse delay line that delays the internal clock signal ICLK with a relatively coarse adjustment pitch, and a fine delay that delays the internal clock signal ICLK with a relatively fine adjustment pitch. It is preferable to include a line.
- the input / output clock signal LCLK is supplied to the FIFO circuit 117 and the input / output circuit 118 and the replica circuit 2 shown in FIG.
- the replica circuit 2 is a circuit having a delay amount equivalent to a delay amount due to an actual signal route from the signal adjustment circuit 1 to the output terminal group 104 (hereinafter simply referred to as “signal route”).
- the replica circuit 2 outputs a replica clock signal RCLK obtained by delaying the input / output clock signal LCLK by a delay amount by a signal route. As a result, the phase of the replica clock signal RCLK matches the phase of the signal output from the data input / output terminal group 104.
- the phase comparison circuit 3 starts when the enable signal ENA is input, and stops operating when the lock signal LOCK is input.
- the lock signal LOCK is output from the counter circuit 5 when the phase of the internal clock signal ICLK matches the phase of the replica clock signal RCLK.
- phase comparison circuit 3 When the phase comparison circuit 3 is activated, it detects the phase difference between the internal clock signal ICLK and the replica clock signal RCLK.
- the phase of the replica clock signal RCLK is adjusted by the signal adjustment circuit 1 so as to match the phase of the output signal from the data input / output terminal group 104.
- the phase of both changes momentarily due to fluctuations in parameters such as voltage and temperature which affect the delay amount of the signal adjustment circuit 1 and fluctuations in the frequency of the internal clock signal ICLK itself.
- the phase comparison circuit 3 detects such a change and determines whether the replica clock signal RCLK is advanced or delayed with respect to the internal clock signal ICLK. This determination is performed for each cycle of the internal clock signal ICLK while the phase comparison circuit 3 is operating.
- the determination result is supplied to the counter circuit 5 as the phase determination signal UD.
- the phase determination signal UD is “H”
- the phase determination signal UD becomes “L”.
- the update timing generation circuit 4 is activated in response to the input of the enable signal ENA and stops operating in response to the input of the lock signal LOCK, as in the phase comparison circuit 3.
- the update timing generation circuit 4 divides the internal clock signal ICLK to generate a count timing signal Count_timing that is a one-shot pulse.
- the count timing signal Count_timing is output to the counter circuit 5 and is used as a synchronization signal indicating the timing at which the count value of the counter circuit 5 is updated. Therefore, the activation cycle of the count timing signal Count_timing is defined as the sampling cycle of the phase adjustment circuit 107a.
- the counter circuit 5 starts when the enable signal ENA is input and stops operating when the lock signal LOCK is output.
- the counter circuit 5 sets the delay amount of the signal adjustment circuit 1 during operation.
- the counter circuit 5 updates the count value in synchronization with the count timing signal Count_timing.
- the increase / decrease of the count value is determined based on the phase determination signal UD supplied from the phase comparison circuit 3.
- the counter circuit 5 when the phase determination signal UD is “H”, the counter circuit 5 up-counts the count value in synchronization with the count timing signal Count_timing, thereby increasing the delay amount of the signal adjustment circuit 1. . Conversely, when the phase determination signal UP is “L”, the counter circuit 5 counts down the count value in synchronization with the count timing signal Count_timing, thereby reducing the delay amount of the signal adjustment circuit 1.
- the counter circuit 5 determines that the phase of the internal clock signal ICLK and the phase of the replica clock signal RCLK coincide with each other when the down count and the up count are alternately repeated a predetermined number of times (for example, twice), and holds the count value at that time However, the activated lock signal LOCK is output, and then the operation is stopped. Note that the counter circuit 5 holds the count value even when the operation is stopped.
- the counter circuit 5 is supplied with a reset signal RESET. When the reset signal RESET is activated, the counter circuit 5 initializes the count value to a preset value.
- phase adjustment control circuit 107b Next, the phase adjustment control circuit 107b will be described.
- FIG. 3 is a diagram showing the phase adjustment control circuit 107b.
- the phase adjustment control circuit 107 b includes an SR latch 11, a determination timing control circuit 12, a holding circuit 13, a comparison voltage generation unit 14, and a control unit 15.
- SR latch 11 accepts lock signal LOCK at set terminal S and accepts reset signal RESET at reset terminal R. Therefore, the SR latch 11 activates (“H”) the output signal from the output terminal Q when the lock signal LOCK is activated (“H”), and activates (“H”) the reset signal RESET. The output signal from the output terminal Q is deactivated (“L”).
- the determination timing control circuit 12 is activated while the output signal of the SR latch 11 is activated.
- the determination timing control circuit 12 outputs the activated comparison timing signal SCLK every time the internal clock signal ICLK is counted a predetermined number of times during the active state.
- the holding circuit 13 is an example of a holding unit.
- the holding circuit 13 holds a reference voltage.
- a capacitor is used as the holding circuit 13.
- the comparison voltage generator 14 generates a comparison voltage depending on the power supply voltages VDDQ and VSSQ (ground).
- the comparison voltage generator 14 has resistors 14a and 14b.
- the resistor 14a is an example of a first resistor.
- the resistor 14b is an example of a second resistor.
- Resistor 14a and resistor 14b are connected in series between power supply voltages VDDQ and VSSQ, and divide power supply voltage VDDQ.
- the resistor 14a has resistors 14a1 and 14a2 connected in series.
- Resistor 14b has resistors 14b1 and 14b2 connected in series. These resistance values may be the same or different.
- the comparison voltage generator 14 generates the voltage at the connection point B of the resistors 14a1 and 14a2 and the voltage at the connection point C of the resistors 14b1 and 14b2 as comparison voltages.
- the control unit 15 intermittently compares the comparison voltage with the reference voltage held in the holding circuit 13.
- the control unit 15 causes the phase adjustment circuit 107a to execute the phase adjustment operation when the comparison result satisfies a predetermined condition representing the fluctuation of the power supply voltage, and uses the reference voltage held in the holding circuit 13 as the power supply voltage. It changes according to voltage VDDQ.
- the control unit 15 includes update control circuits 15a and 15b, a switch circuit 15c, comparison circuits 15d and 15e, and a NAND circuit 15f.
- the update control circuit 15a is, for example, an OR circuit, and outputs an activated enable signal ENA upon receiving an initial signal INIT or an output signal ("H") activated by the NAND circuit 15f.
- the update control circuit 15b is an OR circuit, for example, and outputs an activated update signal UPDATE when receiving an initial signal INIT or an output signal activated by the NAND circuit 15f.
- the switch circuit 15c is connected to the connection point A between the resistor 14a and the resistor 14b and the holding circuit 13, and is turned on when the activated update signal UPDATE is received.
- a transfer gate is used as the switch circuit 15c.
- the comparison circuit 15d compares the voltage at the connection point B with the reference voltage held in the holding circuit 13 while receiving the activated comparison timing signal SCLK.
- the comparison circuit 15d outputs an “H” level signal when it has not received the activated comparison timing signal.
- the comparison circuit 15e compares the voltage at the connection point C with the reference voltage held in the holding circuit 13 while receiving the activated comparison timing signal SCLK.
- the comparison circuit 15e outputs an “H” level signal when it has not received the activated comparison timing signal.
- the NAND circuit 15f receives the outputs of the comparison circuits 15d and 15e, and outputs the NAND logical operation results of the outputs to the update control circuits 15a and 15b.
- FIG. 4 is a timing chart for explaining the operation of the phase adjustment circuit 107a and the phase adjustment control circuit 107b.
- a control circuit (not shown) connected to the semiconductor device 100 first outputs a reset signal to the command terminal group 102 to activate the phase adjustment circuit 107a during a so-called initial sequence after power-on.
- an initial signal indicating the initial sequence is output to the command terminal group 102.
- the reset signal and the initial signal are supplied to the command input circuit 108 via the command terminal group 102, respectively.
- the command input circuit 108 When the command input circuit 108 receives the reset signal from the command terminal group 102, the command input circuit 108 outputs the activated reset signal RESET (signal P1 in FIG. 4) to the phase adjustment circuit 107a and the phase adjustment control circuit 107b. Further, when the command input circuit 108 receives the initial signal from the command terminal group 102, the command input circuit 108 outputs the activated initial signal INIT (signal P2 in FIG. 4) to the phase adjustment control circuit 107b.
- RESET signal P1 in FIG. 4
- the command input circuit 108 receives the initial signal from the command terminal group 102
- the command input circuit 108 outputs the activated initial signal INIT (signal P2 in FIG. 4) to the phase adjustment control circuit 107b.
- the counter circuit 5 receives the activated reset signal RESET, and initializes the count value to a preset value in accordance with the activated reset signal RESET.
- the SR latch 11 receives the activated reset signal RESET and deactivates ("L") the output signal from the output terminal Q in accordance with the activated reset signal RESET. .
- the determination timing control circuit 12 is deactivated and deactivates (“L”) the comparison timing signal SCLK.
- the update control circuit 15a when the update control circuit 15a receives the activated initial signal INIT, the update control circuit 15a generates an activated enable signal ENA (signal P3 in FIG. 4) in accordance with the activated initial signal INIT.
- ENA activated enable signal
- the update control circuit 15b When the update control circuit 15b receives the activated initial signal INIT, the update control circuit 15b outputs the activated update signal UPDATE (signal P4 in FIG. 4) in response to the activated initial signal INIT. Output to.
- phase adjustment circuit 107a the phase comparison circuit 3, the update timing generation circuit 4 and the counter circuit 5 each start the phase adjustment operation (phase P101 in FIG. 4) when receiving the activated enable signal ENA.
- the switch circuit 15c receives the activated update signal UPDATE, the switch circuit 15c is turned on. For this reason, the voltage at the connection point A is supplied to the holding circuit 13 through the switch circuit 15c, and the holding circuit 13 holds the voltage at the connection point A as the reference voltage D (timing T11 in FIG. 4).
- the counter circuit 5 activates the activated lock signal LOCK (FIG. 4 signal P5) is output to the phase comparison circuit 3, the update timing generation circuit 4 and the SR latch 11, and then the operation is stopped.
- the phase comparison circuit 3 and the update timing generation circuit 4 stop operating when receiving the activated lock signal LOCK.
- the SR latch 11 activates the output signal from the output terminal Q when receiving the activated lock signal LOCK.
- the determination timing control circuit 12 When the output signal from the output terminal Q of the SR latch 11 is activated, the determination timing control circuit 12 is activated, and the activated comparison timing signal SCLK (in FIG. 4) every time the internal clock signal ICLK is counted a predetermined number of times.
- the signal P6 at time t2, the signal P7 at time t3, the signal P8 at time t4, the signal P9 at time t5, and the signal P10 at time t6) are output to the comparison circuits 15d and 15e.
- the comparison circuits 15d and 15e are activated when the activated comparison timing signal SCLK is received, and the comparison circuit 15d compares the voltage at the connection point B with the reference voltage D held in the holding circuit 13, and compares 15 e compares the voltage at the connection point C with the reference voltage D held in the holding circuit 13.
- the output signal E of the NAND circuit 15f becomes inactive ("L"), and neither the enable signal ENA from the update control circuit 15a nor the update signal UPDATE from the update control circuit 15b is activated.
- the phase adjustment circuit 107a does not execute the phase adjustment operation in response to the comparison timing signal SCLK (signal P6 in FIG. 4) activated at time t2. Further, the reference voltage D held in the holding circuit 13 is not changed according to the comparison timing signal SCLK (signal P6 in FIG. 4) activated at time t2.
- the phase adjustment circuit 107a receives the internal clock signal ICLK. This is a situation where there is little need to readjust the phase difference with the output clock signal LCLK.
- the comparison circuits 15d and 15e do not receive the activated comparison timing signal SCLK, the comparison circuits 15d and 15e output an “H” level signal. Therefore, also in this case, neither the enable signal ENA from the update control circuit 15a nor the update signal UPDATE from the update control circuit 15b is activated.
- both the voltage at the connection point B and the voltage at the connection point C are lower than the reference voltage D due to fluctuations in the power supply voltage VDDQ / VSSQ. For this reason, the output signal of the comparison circuit 15d becomes “L”, and the output signal of the comparison circuit 15e becomes “H”.
- the output signal E of the NAND circuit 15f becomes active ("H") (signal P11 in FIG. 4), and both the enable signal ENA from the update control circuit 15a and the update signal UPDATE from the update control circuit 15b are active. (Signals P12 and P13 in FIG. 4).
- phase adjustment circuit 107a performs the phase adjustment operation in response to the activated enable signal ENA (signal P12 in FIG. 4) (phase P102 in FIG. 4).
- the reference voltage D held in the holding circuit 13 is also changed to the voltage value at the connection point A at the timing T12 in FIG. 4 in accordance with the activated update signal UPDATE (signal P13 in FIG. 4).
- both the voltage at the connection point B and the voltage at the connection point C are higher than the reference voltage D due to fluctuations in the power supply voltage VDDQ / VSSQ. For this reason, the output signal of the comparison circuit 15d becomes “H”, and the output signal of the comparison circuit 15e becomes “L”.
- the output signal E of the NAND circuit 15f becomes active ("H") (signal P14 in FIG. 4), and both the enable signal ENA from the update control circuit 15a and the update signal UPDATE from the update control circuit 15b are active. (Signals P15 and P16 in FIG. 4).
- phase adjustment circuit 107a performs a phase adjustment operation in response to the activated enable signal ENA (signal P15 in FIG. 4) (phase P103 in FIG. 4).
- the reference voltage D held in the holding circuit 13 is also changed to the value of the voltage at the connection point A at the timing T13 in FIG. 4 according to the activated update signal UPDATE (signal P16 in FIG. 4).
- the control unit 15 in the phase adjustment control circuit 107b intermittently compares the comparison voltage from the comparison voltage generation unit 14 with the reference voltage held in the holding circuit 13, and the result of the comparison is the fluctuation of the power supply voltage VDDQ. Is satisfied, the phase adjustment circuit 107a is caused to execute the phase adjustment operation, and the reference voltage held in the holding circuit 13 is changed according to the power supply voltage VDDQ.
- phase adjustment operation when executed, the voltage at the time of execution is changed as a reference voltage.
- the phase adjustment operation is required because the power supply voltage changes greatly from the last update, and is not necessarily related to the absolute value of the power supply voltage. In other words, when the change is once large and then stabilized, it is not always necessary to perform the phase adjustment after updating when the change is large. As described above, it is possible to suppress the execution of the phase adjustment operation with low necessity.
- control unit 15 outputs the activated enable signal ENA to the phase adjustment circuit 107a when the comparison result satisfies a predetermined condition.
- the phase adjustment circuit 107a performs the phase adjustment operation when receiving the activated enable signal ENA.
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Abstract
Description
入力信号に基づいて出力信号を生成し、また、前記入力信号と前記出力信号との位相差を所定値に設定する調整動作を実行可能な位相調整部と、
基準電圧を保持する保持部と、
電源電圧に依存する比較電圧を生成する比較電圧生成部と、
前記比較電圧と前記保持部に保持された基準電圧とを間欠的に比較し、当該比較の結果が、前記電源電圧の変動を表す所定条件を満たす場合に、前記位相調整部に前記調整動作を実行させ、かつ、前記保持部に保持された基準電圧を前記電源電圧に応じて変更する制御部と、を含む。
入力信号に基づいて出力信号を生成し前記入力信号と前記出力信号との位相差を所定値に設定する調整動作を実行可能な位相調整部を含む出力信号生成装置が行う出力信号生成方法であって、
保持部に基準電圧を保持し、
電源電圧に依存する比較電圧を生成し、
前記比較電圧と前記保持部に保持された基準電圧とを間欠的に比較し、当該比較の結果が、前記電源電圧の変動を表す所定条件を満たす場合に、前記位相調整部に前記調整動作を実行させ、かつ、前記保持部に保持された基準電圧を前記電源電圧に応じて変更する。
101 クロック端子群
102 コマンド端子群
103 アドレス端子群
104 データ入出力端子群
105 電源端子群
106 クロック入力回路
107 入出力用クロック生成部
107a 位相調整回路
107b 位相調整制御回路
108 コマンド入力回路
109 コマンドデコード回路
110 リフレッシュ制御回路
111 アドレス入力回路
112 アドレスラッチ回路
113 モードレジスタ
114 メモリセルアレイ
115 ロウデコーダ
116 カラムデコーダ
117 FIFO回路
118 入出力回路
119 内部電源発生回路
BL ビット線
WL ワード線
MC メモリセル
1 信号調整回路
2 レプリカ回路
3 位相比較回路
4 更新タイミング発生回路
5 カウンタ回路
11 SRラッチ
12 判定タイミング制御回路
13 保持回路
14 比較電圧生成部
14a、14a1、14a2、14b、14b1、14b2 抵抗
15 制御部
15a、15b 更新制御回路
15c スイッチ回路
15d、15e 比較回路
15f NAND回路
Claims (8)
- 入力信号に基づいて出力信号を生成し、また、前記入力信号と前記出力信号との位相差を所定値に設定する調整動作を実行可能な位相調整部と、
基準電圧を保持する保持部と、
電源電圧に依存する比較電圧を生成する比較電圧生成部と、
前記比較電圧と前記保持部に保持された基準電圧とを間欠的に比較し、当該比較の結果が、前記電源電圧の変動を表す所定条件を満たす場合に、前記位相調整部に前記調整動作を実行させ、かつ、前記保持部に保持された基準電圧を前記電源電圧に応じて変更する制御部と、を含む出力信号生成装置。 - 前記制御部は、前記比較の結果が前記所定条件を満たす場合に、調整用信号を前記位相調整部に出力し、
前記位相調整部は、前記調整用信号を受け付けた場合に、前記調整動作を実行する、請求項1に記載の出力信号生成装置。 - 直列に接続され前記電源電圧を分割する第1および第2抵抗を含み、
前記制御部は、前記比較の結果が前記所定条件を満たす場合に、前記位相調整部に前記調整動作を実行させ、かつ、前記保持部に保持された基準電圧の値を、その時点での前記第1および第2抵抗の接続点の電圧の値に変更する、請求項1または2に記載の出力信号生成装置。 - 前記比較電圧生成部は、前記第1および第2抵抗を含み、
前記第1の抵抗は、直列に接続された第3および第4抵抗を有し、
前記第2の抵抗は、直列に接続された第5および第6抵抗を有し、
前記比較電圧生成部は、前記第3および第4抵抗の接続点である第1接続点の電圧と、前記第5および第6抵抗の接続点である第2接続点の電圧とを、前記比較電圧としてそれぞれ生成する、請求項3に記載の出力信号生成装置。 - 前記所定条件は、前記保持部に保持された基準電圧が、前記第1接続点の電圧と前記第2接続点の電圧との各々よりも高い、または、前記第1接続点の電圧と前記第2接続点の電圧との各々よりも低いという条件である、請求項4に記載の出力信号生成装置。
- 前記制御部は、前記入力信号に基づいて特定される周期で、前記比較電圧と前記保持部に保持されている基準電圧とを比較する、請求項1から5のいずれか1項に記載の出力信号生成装置。
- 請求項1から6のいずれか1項に記載の出力信号生成装置と、
メモリセルと、
前記出力信号生成装置にて生成された出力信号に応じて、前記メモリセルへのデータの書き込み、または、前記メモリセルからのデータの読み出しを実行する入出力部と、を含む半導体装置。 - 入力信号に基づいて出力信号を生成し前記入力信号と前記出力信号との位相差を所定値に設定する調整動作を実行可能な位相調整部を含む出力信号生成装置が行う出力信号生成方法であって、
保持部に基準電圧を保持し、
電源電圧に依存する比較電圧を生成し、
前記比較電圧と前記保持部に保持された基準電圧とを間欠的に比較し、当該比較の結果が、前記電源電圧の変動を表す所定条件を満たす場合に、前記位相調整部に前記調整動作を実行させ、かつ、前記保持部に保持された基準電圧を前記電源電圧に応じて変更する、出力信号生成方法。
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