WO2014119558A1 - Dll回路および半導体装置 - Google Patents
Dll回路および半導体装置 Download PDFInfo
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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
- H03L7/0818—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 comprising coarse and fine delay or phase-shifting means
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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
- 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
- G11C7/222—Clock generating, synchronizing or distributing circuits within memory device
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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
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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
Definitions
- the present invention is based on the priority claim of Japanese Patent Application No. 2013-014453 (filed on Jan. 29, 2013), the entire contents of which are incorporated herein by reference. Shall.
- the present invention relates to a DLL (Delay Locked Loop) circuit and a semiconductor device, for example, a DLL circuit mounted on a semiconductor memory device and a semiconductor memory device including the DLL circuit.
- a synchronous memory that operates in synchronization with a clock signal has been widely used as a main memory of a personal computer or the like.
- DDR Double Data Rate
- input / output data needs to be accurately synchronized with an external clock signal. Therefore, a DLL (Delay Locked) that generates an internal clock signal synchronized with the external clock signal is required. Loop) circuit is essential.
- Patent Document 1 describes a DRAM (Dynamic Random Access Memory) having a DLL circuit.
- DRAM Dynamic Random Access Memory
- output of data read from a memory cell, self refresh timing of the memory cell, and the like are controlled based on an internal clock signal generated by a DLL circuit.
- Patent Document 2 describes a DLL circuit used in a semiconductor memory device.
- the DLL circuit described in Patent Document 2 includes a delay line CDL (Coarse Delay Line) with a coarse adjustment pitch and a delay line FDL (Fine Delay Line) with a fine adjustment pitch. After the delay amount is roughly set using the delay line CDL, the delay amount is accurately set using the delay line FDL, thereby determining the delay amount at high speed.
- CDL Coarse Delay Line
- FDL Fast Delay Line
- Patent Document 3 discloses a clock generation circuit that divides an external clock signal to generate an operation clock signal based on the divided clock signal, and a counter circuit that updates a count value in synchronization with the generated operation clock signal. And a delay line that delays an external clock signal based on a delay amount determined according to a count value to generate an internal clock signal.
- Patent Document 4 includes a variable delay circuit that generates an internal clock signal by delaying an external clock signal, and a frequency dividing circuit that generates a sampling clock signal by dividing the external clock signal. There is described a DLL circuit configured to use a sampling clock signal as a synchronization signal indicating the timing of changing the delay amount of the delay circuit.
- FIG. 1 is a block diagram illustrating a configuration of a digitally controlled DLL according to Study Example 1.
- the DLL circuit includes a granularity changing circuit 116, a control circuit 117, a counter circuit 118, a decoder circuit 119, a variable delay circuit 122, a phase determination circuit 124, a frequency divider circuit 126, and a detection circuit 128. Yes.
- the DLL circuit shown in FIG. 1 generates the output clock signal CKOUT by delaying the input clock signal CK by a desired phase (target phase).
- the divider circuit 126 divides the input clock signal CK to generate divided clock signals CK1 to CK3 having different phases.
- the divided clock signal CK1 has a phase advanced from the divided clock signal CK2, and the divided clock signal CK2 has a phase advanced from the divided clock signal CK3.
- the division ratio of the divided clock signal is determined by the operating frequency and the feedback delay of the DLL circuit. As an example, in DDR3 (DoubleDData Rate 3), a division ratio of 10 or more is used.
- the counter circuit 118 generates a count value that determines the delay amount of the signal by the variable delay circuit 122, and outputs a count signal CNT indicating the count value to the decoder circuit 119.
- the decoder circuit 119 decodes the count signal CNT received from the counter circuit 118 and outputs it to the variable delay circuit 122.
- the variable delay circuit 122 generates and outputs an output clock signal CKOUT obtained by delaying the input clock signal CK according to the delay amount determined according to the count signal CNT.
- the phase determination circuit 124 determines whether or not the phase difference between the input clock signal CK and the output clock signal CKOUT is larger than the desired target phase, and outputs the determination result to the control circuit 117 as a phase determination signal.
- the control circuit 117 refers to the phase determination signal in synchronization with the divided clock signal CK1, and indicates whether the phase difference between the input clock signal CK and the output clock signal CKOUT is larger than a desired target phase. Is generated. When the phase difference between the input clock signal CK and the output clock signal CKOUT is larger than the desired target phase, the control circuit 117 outputs a low-level up / down signal UPDN, and the phase difference between the input clock signal CK and the output clock signal CKOUT is If it is smaller than the desired target phase, a high level up / down signal UPDN is output.
- the level of the up / down signal UPDN output by the control circuit 117 is low level and high level. It detects whether it changed between.
- the detection circuit 128 outputs a high-level target edge detection signal TE when the level of the up / down signal UPDN changes before and after the count value is changed, and otherwise outputs a low-level target edge detection signal TE.
- the granularity changing circuit 116 refers to the target edge detection signal TE in synchronization with the frequency-divided clock signal CK2, and when the target edge detection signal TE is at a high level, the width when the counter circuit 118 increments or decrements the count value. (Also referred to as granularity or count width) is changed from large to small, and a granularity designation signal indicating the count width is output.
- the counter circuit 118 refers to the up / down signal UPDN and the granularity designation signal in synchronization with the divided clock signal CK3.
- the count value is the count width designated by the granularity designation signal.
- the count value is decremented by the count width specified by the granularity designation signal.
- the count width or granularity
- the count value has a large count width.
- the granularity is said to be coarse, and the case where the count width of the count value is small is said to be fine. That is, when the granularity is coarse, the delay amount is roughly adjusted by the variable delay circuit 122, and when the granularity is fine, the delay amount is finely adjusted by the variable delay circuit 122.
- FIG. 2 is a timing chart showing an example of the operation of the DLL circuit (FIG. 1) according to the present study example.
- the division ratio of the divided clock signals CK1 to CK3 is set to 5.
- the control circuit 117 refers to the phase determination signal output from the phase determination circuit 124 in synchronization with the rising edge of the divided clock signal CK1 at time t1, and outputs the DLL circuit output phase (ie, the input clock signal CK and the output clock). Since the phase difference from the signal CKOUT is larger than the target phase, the low-level up / down signal UPDN is output.
- the detection circuit 128 detects that the up / down signal UPDN output from the control circuit 117 has fluctuated before and after the counter circuit 118 changes the count value, and outputs a high-level target edge detection signal TE. .
- the granularity changing circuit 116 refers to the target edge detection signal TE output from the detection circuit 128 in synchronization with the rising edge of the divided clock signal CK2 at time t2, and the target edge detection signal TE is at a high level. Then, the count width of the counter circuit 118 is changed from 16 to 4, and a granularity designation signal indicating the changed count width 4 is output.
- the counter circuit 118 refers to the up / down signal UPDN and the granularity designation signal in synchronization with the rising edge of the divided clock signal CK3 at time t3. Since the up / down signal UPDN is at the low level and the granularity designation signal indicates the count width 4, the counter circuit 118 decrements the count value by the count width 4.
- the granularity changing circuit 116 changes the granularity every time the target edge is detected in synchronization with the divided clock signal CK2 having a phase advanced from that of the divided clock signal CK3. Finally, the DLL circuit reaches a locked state by adjusting the phase with the minimum granularity.
- the locked state is reached in a period corresponding to five cycles of the divided clock signal.
- the time until the lock state is reached corresponds to 25 cycles of the input clock signal CK.
- the setup time (counter width change time) tCR from when the count width (granularity) is changed to when the counter value is updated Is required.
- the count value is updated using the divided clock signal CK3 that is delayed in phase from the divided clock signal CK2. Since the divided clock signals CK1, CK2, and CK3 are generated in synchronization with the input clock signal CK, they have a phase difference that is an integral multiple of the input clock signal CLK.
- the setup time tCR is required as the setup time tCR.
- the frequency division ratio of the control frequency-divided clock signal is always the frequency division ratio (the frequency division ratio of 5 in FIG. 2) obtained by adding the setup time tCR. Yes.
- FIG. 3 is a block diagram illustrating a configuration of a digitally controlled DLL circuit according to Study Example 2.
- the counter circuit 118 increments or decrements the count value by using the divided clock signal CK2.
- the DLL circuit according to Study Example 1 (FIG. 1), in order to change the count value using the divided clock signal CK3, it is necessary to insert the setup time tCR for each frequency division cycle.
- the DLL circuit according to Study Example 2 it is not necessary to insert the setup time tCR for each frequency division cycle, and the frequency division cycle is shortened by one cycle compared with the DLL circuit according to Study Example 1 (that is, the division time is divided).
- the frequency division ratio of the peripheral clock signal can be reduced by 1).
- FIG. 4 is a timing chart showing an example of the operation of the DLL circuit (FIG. 3) according to Study Example 2.
- the division ratio of the divided clock signals CK1 to CK3 is 4.
- the control circuit 117 refers to the phase determination signal output from the phase determination circuit 124 in synchronization with the rising edge of the divided clock signal CK1 at the time t1, and the output phase of the DLL circuit is larger than the target phase. Output an up / down signal UPDN.
- the detection circuit 128 detects that the up / down signal UPDN output from the control circuit 117 has fluctuated before and after the counter circuit 118 changes the count value, and outputs a high-level target edge detection signal TE. .
- the granularity changing circuit 116 refers to the target edge detection signal TE output from the detection circuit 128 in synchronization with the rising edge of the divided clock signal CK2 at time t2, and the target edge detection signal TE is at a high level.
- the counter circuit 118 changes the count width when the count value is updated from 16 to 4, and outputs a granularity designation signal indicating the changed count width 4.
- the counter circuit 118 refers to the up / down signal UPDN and the granularity designation signal in synchronization with the rising edge of the divided clock signal CK2 at time t2. Since the up / down signal UPDN is at the low level and the granularity designation signal indicates the count width 16, the counter circuit 118 decrements the count value by the count width 16. In Study Example 2, the change in the count width and the update of the count value are performed in synchronization with the same divided clock signal CK2, so that the change in the count width is not reflected in the update of the count value at time t2.
- control circuit 117 refers to the phase determination signal output from the phase determination circuit 124 in synchronization with the rising edge of the divided clock signal CK1 at time t5, and the output phase of the DLL circuit is smaller than the target phase. To output a high level up / down signal UPDN.
- the detection circuit 128 detects that the up / down signal UPDN output from the control circuit 117 has fluctuated before and after the counter circuit 118 changes the count value, and outputs a high-level target edge detection signal TE. .
- the granularity changing circuit 116 refers to the target edge detection signal TE output from the detection circuit 128 in synchronization with the rising edge at time t6 of the divided clock signal CK2. Although the target edge detection signal TE is at a high level, a period from when the previous count width is changed until the count width change is reflected in the update of the count value (that is, a period corresponding to one cycle of the divided clock signal) ) Has not elapsed, the granularity changing circuit 116 does not change the count width. Therefore, the granularity changing circuit 116 outputs a granularity designation signal indicating the count width 4.
- the counter circuit 118 refers to the up / down signal and the granularity designation signal in synchronization with the rising edge of the divided clock signal CK2 at time t6. Since the up / down signal UPDN is at the high level and the granularity designation signal indicates the count width 4, the counter circuit 118 increments the count value by the count width 4.
- the locked state is reached in a period corresponding to eight cycles of the divided clock signal.
- the time until the locked state is 32 periods of the input clock signal CK.
- the granularity change waiting time tCR for one frequency division cycle occurs when the granularity is changed. That is, according to the DLL circuit according to the study example 2, the frequency division ratio of the divided clock signal can be reduced as compared with the DLL circuit according to the study example 1 (FIG. 1).
- a DLL (Delay Locked Loop) circuit is A variable frequency dividing circuit for generating a first divided clock signal and a second divided clock signal by dividing the first clock signal by a variable dividing ratio; A granularity changing circuit for changing a count width in synchronization with the first divided clock signal; A counter circuit that updates a count value in accordance with the count width in synchronization with the second divided clock signal; A variable delay circuit that generates a second clock signal by delaying the first clock signal based on a delay amount corresponding to the count value; When the magnitude relationship between the phase difference between the first clock signal and the second clock signal and a predetermined value is reversed before and after the update of the count value, the granularity changing circuit changes the count width and changes the variable
- the frequency dividing circuit makes the frequency dividing ratio of the second frequency-divided clock signal larger than the frequency dividing ratio of the first frequency-divided clock signal.
- the DLL circuit capable of adjusting the change amount of the delay amount can be locked in a short time.
- FIG. 6 is a timing diagram illustrating an operation of the DLL circuit according to the first embodiment as an example. It is the table
- FIG. 6 is a block diagram showing an example of the configuration of a DLL (Delay Locked Loop) circuit according to the present invention.
- the DLL circuit (70) divides the first clock signal (input clock signal CK) by a variable division ratio, thereby dividing the first divided clock signal (CK2) and the second clock signal (CK2).
- a variable frequency dividing circuit (26) that generates a divided clock signal (CK2C), and a granularity change that changes the count width (increment width or decrement width of the count value) in synchronization with the first divided clock signal (CK2).
- FIG. 7 is a timing chart showing an example of the operation of the DLL circuit (70).
- the magnitude relationship between the phase difference (DLL circuit output phase) between the first clock signal (CK) and the second clock signal (CKOUT) and a predetermined value (target phase) is an update of the count value.
- the granularity changing circuit (16) changes the count width
- the variable frequency dividing circuit (26) changes the frequency dividing ratio of the second frequency divided clock signal (CK2C) to the first frequency divided clock signal ( It is made larger than the frequency division ratio of CK2).
- the granularity changing circuit (16) changes the count width from 16 to 4 to 4 to 1.
- the variable frequency dividing circuit (26) sets the frequency dividing ratio of the second frequency-divided clock signal (CK2C) to 5 and is larger than 4 that is the frequency-dividing ratio of the first frequency-divided clock signal (CK2). ing.
- the DLL circuit (70) when the magnitude relationship between the phase difference between the first clock signal (CK) and the second clock signal (CKOUT) and a predetermined value (target phase) is reversed before and after the count value is updated.
- the frequency division ratio of the second frequency-divided clock signal (CK2C) is made larger than the frequency division ratio of the first frequency-divided clock signal (CK2).
- the lock timing of the count value can be delayed from the change timing of the count width. Therefore, according to the DLL circuit (70), the locked state can be reached in a shorter time as compared with the DLL circuits according to the study example 1 (FIG. 1) and the study example 2 (FIG. 3). This is because the frequency division ratio can be increased only when the count width is updated.
- variable frequency dividing circuit (26) increases the frequency dividing ratio of the second frequency-divided clock signal (CK2C) higher than the frequency dividing ratio of the first frequency-divided clock signal (CK2), and then It is preferable that the division ratio of the divided clock signal (CK2) is larger than the division ratio of the second divided clock signal (CK2C).
- the division ratio of the divided clock signal (CK2) is larger than the division ratio of the second divided clock signal (CK2C).
- variable frequency dividing circuit (26) divides the first clock signal (CK) by the same frequency dividing ratio (frequency dividing ratio 4 in FIG. 7) to thereby generate a first frequency divided clock having no phase difference.
- the signal (CK2) and the second divided clock signal (CK2C) are generated, and the second divided clock signal (CK2C) is divided in the divided clock cycle in which the magnitude relationship is reversed before and after the count value is updated.
- the ratio is made larger than the division ratio of the first divided clock signal (CK2), and the division ratio of the first divided clock signal (CK2) is set in the next divided clock period of the divided clock period.
- the frequency division ratio of the second frequency-divided clock signal (CK2) may be set larger.
- variable frequency dividing circuit (26) divides the first clock signal (CK) by the same frequency dividing ratio, thereby dividing the first frequency-divided clock signal (CK2) and the first frequency-divided circuit (CK2). It is preferable to further generate a third divided clock signal (CK1) having a phase advanced from that of the divided clock signal (CK2C).
- the DLL circuit (70) refers to the determination result by the phase determination circuit (24) in synchronization with the third divided clock signal (CK1), and the first clock signal (CK1) and the second clock signal. It is preferable to further include a control circuit (17) that generates an up / down signal (UPDN) indicating a magnitude relationship between the phase difference of (CKOUT) and a predetermined value (target phase). At this time, when the up / down signal (UPDN) indicates that the phase difference is smaller than the predetermined value, the counter circuit (18) increments the count value by the count width, and the phase difference becomes the predetermined value. If the up / down signal (UPDN) indicates that the count value is larger than the count value, the count value is decremented by the count width.
- UPDN up / down signal
- variable frequency dividing circuit (26) sets the frequency dividing ratio of the second frequency-divided clock signal (CK2C) to the first in the frequency-divided clock cycle in which the magnitude relationship is reversed before and after the count value is updated.
- the first divided clock signal (CK2) and the third frequency-divided clock signal (CK1) may be larger than the frequency division ratio of the second frequency-divided clock signal (CK2C).
- the DLL circuit (70) determines whether or not the phase difference between the first clock signal (CK) and the second clock signal (CKOUT) is larger than a predetermined value. (24) is preferably provided. Further, the DLL circuit (70) reverses the magnitude relationship between the phase difference and the predetermined value before and after the counter circuit (18) updates the count value based on the determination result of the phase determination circuit (24). It is preferable to include a detection circuit (28) for detecting this and notifying the detection result to the variable frequency dividing circuit (26) and the granularity changing circuit (16).
- FIG. 5 is a block diagram illustrating an example of the configuration of the semiconductor device (10) including the DLL circuit (70).
- the semiconductor device (10) receives the external clock signal (CKS) as the first clock signal (CK) and is synchronized with the external clock signal (CKS) as the second clock signal (CKOUT).
- a DLL circuit (70) for generating an internal clock signal (LCLK_OUT1), a memory cell (MC) for storing output data, and an output buffer (input / output) for outputting the output data to the outside in synchronization with the internal clock signal (LCLK_OUT1) Circuit 64).
- the semiconductor device (10) it is possible to realize a high-speed read operation.
- FIG. 5 is a block diagram showing an example of the configuration of a semiconductor device including a DLL circuit according to the present embodiment.
- the semiconductor device 10 is a DDR type SDRAM (Synchronous Dynamic Random Access Memory), and as external terminals, a clock terminal 11, a command terminal 12, an address terminal 13, and a data input / output terminal 14 (external data terminal).
- the data strobe terminal 15 is provided.
- the clock terminal 11 is supplied with an external clock signal CKS.
- the supplied external clock signal CKS is supplied to the clock buffer 40 and the DLL circuit 70.
- the clock buffer 40 generates a single-phase internal clock signal ICLK based on the external clock signal CKS and supplies it to the command decoder 32.
- the DLL circuit 70 receives the external clock signal CKS and generates an internal clock signal LCLK that is phase-controlled and duty-controlled with respect to the external clock signal CKS.
- the phase control is control for adjusting the phase of the rising (rise) edge of the clock signal.
- the duty control is a control for adjusting the ratio of the rising period and the falling period (duty ratio) in one cycle of the clock signal to 1: 1 by adjusting the phase of the falling (falling) edge of the clock signal.
- the generated internal clock signal LCLK is supplied to clock output control circuits 73 and 74.
- the DLL circuit 70 has a function of determining whether or not the phase and duty ratio of the internal clock signal LCLK have reached the target values (that is, whether the internal clock signal LCLK has been locked), and when determining that the internal clock signal LCLK has locked, the oscillator start signal DLL_OSC_Enable And a function of activating.
- the oscillator start signal DLL_OSC_Enable is supplied to the DLL refresh control circuit 71.
- the oscillator activation signal DLL_OSC_Enable is an activation signal for starting measurement after the phase control is once completed until the next phase control is performed. During this period, the oscillator circuit included in the DLL refresh control circuit 71 operates in response to the oscillator start signal DLL_OSC_Enable, counts a predetermined number of clock signals, and then the DLL refresh control circuit 71 instructs readjustment. This is realized by activating DLL_START. In response to the DLL start signal DLL_START, the DLL circuit 70 executes phase control and the like again.
- the clock output control circuit 73 receives the internal clock signal LCLK, generates the internal clock signal LCLK_OUT1 while switching the operation mode according to the active states of an internal active command ACT and an internal read command READ, which will be described later, and outputs the internal clock signal LCLK_OUT1 to the output node 73a. Output.
- the internal clock signal LCLK_OUT1 is not output, the clock stop mode in which the potential of the output node 73a is fixed to a low level or a high level, and a clock signal (long cycle clock signal) having a longer cycle than the internal clock signal LCLK is generated.
- a long cycle clock output mode for outputting the internal clock signal LCLK_OUT1
- a normal clock output mode for outputting the internal clock signal LCLK as the internal clock signal LCLK_OUT1.
- the output potential of the output node 73a is supplied to the FIFO 63, the input / output circuit 64, and the DQS input / output circuit 65 through the clock transmission circuit 3.
- the clock transmission circuit 3 includes a buffer circuit 75 and a clock tree 76.
- the buffer circuit 75 includes, for example, a plurality of CMOS (Complementary Metal Oxide Semiconductor) connected in series, and outputs an internal clock signal LCLK_OUT1 to the FIFO 63 and the clock tree 76.
- the clock tree 76 distributes the supplied internal clock signal LCLK_OUT1 to the input / output circuit 64 and the DQS input / output circuit 65.
- the clock tree 76 also includes, for example, a plurality of CMOSs inside.
- the clock output control circuit 74 supplies the internal clock signal LCLK to the replica circuit 72 as the internal clock signal LCLK_OUT2 when any of the later-described DLL on signal DLL_ON and DLL start signal DLL_START is activated. When neither is activated, the output of the clock output control circuit 74 is controlled to be fixed at a low level or a high level.
- the replica circuit 72 is a circuit that reproduces the clock transmission circuit 3 in a pseudo manner.
- the internal clock signal LCLK_OUT2 input to the replica circuit 72 is supplied to the DLL circuit 70 after receiving a delay or waveform change substantially equal to the delay or waveform change that the internal clock signal LCLK_OUT1 receives while passing through the clock transmission circuit 3.
- the replica circuit 72 reproduces the internal delay of the semiconductor device 10 and feeds it back to the DLL circuit 70 to control the timing of the internal clock signal LCLK.
- the semiconductor device 10 can output read data at a timing synchronized with the external clock signal CKS.
- the command terminal 12 includes a clock enable signal CKE, a row address strobe signal / RAS, a column address strobe signal / CAS, a write enable signal / WE, a chip select signal / CS, a reset signal / RESET, an active command signal ACT, and a read command signal READ.
- Each command signal CMD such as an idle command signal IDLE is supplied.
- a signal having “/” at the head of the signal name means an inverted signal of the corresponding signal or a low active signal.
- the command signal CMD supplied to the command terminal 12 is supplied to the command decoder 32 via the command buffer 31.
- the internal clock enable signal ICKE obtained by buffering the clock enable signal CKE is also supplied to the clock buffer 40 and the address buffer 41. This is because power consumption can be reduced by stopping the operations of the clock buffer 40 and the address buffer 41 when the clock enable signal CKE is inactive (the internal clock enable signal ICKE is inactive), that is, in a so-called power down mode. .
- the clock buffer 40 and the address buffer 41 each perform a buffering operation.
- the command decoder 32 receives various command signals CMD from the command buffer 31, and generates various internal commands by holding, decoding and counting the command signal CMD.
- These internal commands include various internal commands related to reading / writing of memory cells such as an internal active command ACT, an internal idle command IDLE, an internal read command READ, and an internal write command WRITE, as well as activation / deactivation of the DLL circuit 70.
- a DLL enable command DLLEnable instructing deactivation, a self-refresh command SelfEnable instructing start / stop of the self-refresh of the memory cell array 60, and the like are also included.
- Each internal command generated by the command decoder 32 is supplied to each circuit in the semiconductor device 10. Specifically, the internal active command ACT is sent to the row control circuit 51, the internal active command ACT, the internal read command READ, and the internal idle command IDLE are sent to the clock output control circuit 73, and the internal read command READ is sent to the column control circuit 52. However, a DLL enable command DLLEnable and a self-refresh command SelfEnable are supplied to the DLL refresh control circuit 71, respectively.
- the address terminal 13 is a terminal to which an address signal ADD composed of n + 1 address bits A0 to An is supplied.
- the supplied address signal ADD is buffered in the address buffer 41, and the row address control circuit for the row address. 51, the column address is supplied to the column control circuit 52 and latched.
- the row-related control circuit 51 is a circuit that selects one of the word lines WL included in the memory cell array 60 based on the row address supplied from the address buffer 41.
- a plurality of word lines WL and a plurality of bit lines BL intersect, and memory cells MC are arranged at the intersections (in FIG. 5, one word line WL, one line) Only the bit line BL and one memory cell MC are shown).
- the bit line BL is connected to the corresponding sense amplifier SA in the sense circuit 61.
- the column system control circuit 52 is a circuit that selects one of the sense amplifiers SA included in the sense circuit 61.
- the sense amplifier SA selected by the column control circuit 52 is connected to a read / write amplifier (RWAMP) 62 via the main I / O line MIO.
- RWAMP read / write amplifier
- the read data DQ amplified by the sense amplifier SA is further amplified by the read / write amplifier 62, and is output to the outside from the data input / output terminal 14 via the FIFO 63 and the input / output circuit 64.
- write data DQ input from the outside through the data input / output terminal 14 is sequentially input to the read / write amplifier 62 through the input / output circuit 64 and the FIFO 63, amplified, and then supplied to the sense amplifier SA. Supplied.
- Data input / output terminal 14 outputs read data DQ and input write data DQ.
- the semiconductor device 10 is provided with m + 1 (m ⁇ 0) data input / output terminals 14 so that m + 1 bits of data can be input or output simultaneously.
- the FIFO 63 is a first-in first-out circuit for queuing the read data DQ or the write data DQ, and is provided for each data input / output terminal 14. The description will be focused on the read operation.
- the read data DQ output from the read / write amplifier 62 is distributed to each data input / output terminal 14 by a multiplexer (not shown) and is queued to the corresponding FIFO 63.
- the FIFO 63 outputs the queued read data DQ to the input / output circuit 64 at a timing synchronized with the internal clock signal LCLK.
- the input / output circuit 64 has an output circuit and an input circuit provided for each data input / output terminal 14. The description will focus on the read operation.
- the output buffer shapes the read data DQ output from the corresponding FIFO 63 and outputs the read data DQ from the corresponding data input / output terminal 14 to the outside at a timing synchronized with the internal clock signal LCLK_OUT1.
- the data strobe terminal 15 is a terminal for inputting / outputting a data strobe signal DQS which is an operation reference of data input / output between the DQS input / output circuit 65 and an external controller.
- the DQS input / output circuit 65 has an output circuit and an input circuit provided for each data input / output terminal 14.
- the data strobe signal DQS is input from the outside to the DQS input / output circuit 65 through the data strobe terminal 15.
- the DQS input / output circuit 65 controls the timing at which the input / output circuit 64 takes in the write data DQ from the data input / output terminal 14 based on the input data strobe signal DQS.
- the data strobe data signal DQS_DATA is supplied from the inside of the semiconductor device 10 to the DQS input / output circuit 65.
- the DQS input / output circuit 65 outputs the data strobe data signal DQS_DATA to the data strobe terminal 15 in synchronization with the internal clock signal LCLK_OUT 1 supplied from the clock tree 76.
- the external controller takes in the read data DQ output from the data input / output terminal 14 in synchronization with the output data strobe data signal DQS_DATA. That is, the DLL circuit 70 controls the internal clock signal LCLK so that the data strobe data signal DQS_DATA is synchronized with the external clock signal CKS.
- the DLL refresh control circuit 71 controls the timing for performing the self refresh of the memory cell array 60 and the timing for starting the DLL circuit 70. Since the self-refresh control timing and the start timing of the DLL circuit 70 can be reduced in area by using a common oscillator circuit included in the DLL refresh control circuit 71, the common refresh circuit is used in this way. However, those for self-refreshing and for DLL control may be provided without sharing them.
- the DLL refresh control circuit 71 includes data Self_Timing indicating the self-refresh interval and data DLL_Timing indicating the periodic start interval of the DLL circuit 70. Is supplied from the ROM 77. These data are written in the ROM 77 at the time of manufacture.
- the DLL refresh control circuit 71 first activates the DLL on signal DLL_ON indicating the DLL activation period when the input DLL enable command DLLEnable is activated, and the DLL on when the DLL enable command DLLEnable is input.
- the signal DLL_ON is deactivated.
- the DLL on signal DLL_ON is supplied to the DLL circuit 70, the clock output control circuit 74, and the replica circuit 72.
- the DLL ON signal DLL_ON When the DLL ON signal DLL_ON is activated, the DLL circuit 70 performs phase control and duty control of the internal clock signal LCLK, and generates an internal clock signal LCLK in which they are adjusted. This is called the first adjustment.
- the DLL circuit 70 activates the oscillator start signal DLL_OSC_Enable.
- the DLL refresh control circuit 71 periodically generates a DLL start signal DLL_START indicating the update period of the DLL circuit 70 at an interval indicated by the data DLL_Timing. Activate.
- the DLL start signal DLL_START is activated after the oscillator start signal DLL_OSC_Enable is input to an oscillator circuit (not shown) in the DLL refresh control circuit 71 to oscillate a clock signal and count a predetermined number of the clock signal. This is because the DLL circuit 70 adjusts the internal clock signal LCLK for the second and subsequent times according to the DLL start signal DLL_START. In this manner, the DLL circuit 70 periodically adjusts the internal clock signal LCLK to generate the internal clock LCLK within the semiconductor device 10 so that the read data output timing can be synchronized with the external clock at any timing. It is possible to do.
- the DLL refresh control circuit 71 periodically generates a self-refresh start signal SREF_START at an interval indicated by the data Self_Timing when the self-refresh command SelfEnable is activated, and a refresh circuit (REF) 53 Output to.
- the self refresh start signal SREF_START is also activated by the control of the oscillator.
- the refresh circuit 53 outputs row addresses in a predetermined order.
- the refresh circuit 53 receives the self-refresh start signal SREF_START, the refresh circuit 53 outputs the row address next to the previously output row address to the row-related control circuit 51. By repeating this process, self refresh is finally performed for all row addresses.
- FIG. 6 is a block diagram showing an example of the configuration of the DLL circuit 70 according to the present embodiment.
- the DLL circuit 70 includes a granularity changing circuit 16, a control circuit 17, a counter circuit 18, a decoder circuit 19, a variable delay circuit 22, a phase determination circuit 24, a variable frequency dividing circuit 26, and a detection circuit 28.
- the DLL circuit 70 generates the output clock signal CKOUT by delaying the input clock signal CK by a desired phase (target phase), and outputs the generated output clock signal CKOUT.
- the variable frequency dividing circuit 26 divides the input clock signal CK by a variable frequency dividing ratio to generate frequency-divided clock signals CK1, CK2, and CK2C having different phases.
- the phase of the divided clock signal CK1 is ahead of that of the divided clock signals CK2 and CK2C.
- the divided clock signals CK2 and CK2C have the same phase in the default state except for the case described later.
- the variable frequency divider 26 outputs three frequency-divided clock signals CK1, CK2, and CK2C.
- the variable frequency divider 26 outputs other frequency-divided clock signals. You may make it do.
- the counter circuit 18 generates a count value for determining the delay amount of the signal by the variable delay circuit 22, and outputs a count signal CNT indicating the count value to the decoder circuit 19.
- the decoder circuit 19 decodes the count signal CNT received from the counter circuit 18 and outputs it to the variable delay circuit 22.
- variable delay circuit 22 delays the input clock signal CK according to the delay amount determined according to the count signal CNT, and generates the output clock signal CKOUT.
- the phase determination circuit 24 determines whether or not the phase difference between the input clock signal CK and the output clock signal CKOUT is larger than the desired target phase, and outputs the determination result to the control circuit 17 as a phase determination signal.
- the control circuit 17 refers to the phase determination signal in synchronization with the divided clock signal CK1, and indicates whether the phase difference between the input clock signal CK and the output clock signal CKOUT is larger than the desired target phase.
- a signal UPDN is generated.
- the control circuit 17 outputs a low-level up / down signal UPDN, and the level of the input clock signal CK and the output clock signal CKOUT. If the phase difference is smaller than the desired target phase, a high level up / down signal UPDN is output.
- the detection circuit 28 detects whether or not the up / down signal UPDN output from the control circuit 17 has changed before and after the counter circuit 18 changes the count value (that is, before and after the variable delay circuit 22 changes the delay amount). To do.
- the detection circuit 28 outputs a high-level target edge detection signal TE when the up / down signal UPDN fluctuates before and after the count value is changed, and outputs a low-level target edge detection signal TE otherwise.
- the granularity changing circuit 16 refers to the target edge detection signal TE in synchronization with the divided clock signal CK2, and when the target edge detection signal TE is at high level, the counter circuit 18 updates (increments or decrements) the count value. The count width at that time is changed from large to small, and a granularity designation signal indicating the count width is output.
- variable frequency dividing circuit 26 When the variable frequency dividing circuit 26 detects that the target edge detection signal TE has transitioned from the low level to the high level, the frequency dividing circuit 26 divides the frequency dividing ratio of the divided clock signal CK2C in the clock cycle. Larger than the ratio. Further, the variable frequency dividing circuit 26 makes the frequency dividing ratio of the frequency-divided clock signals CK1 and CK2 larger than the frequency dividing ratio of the frequency-divided clock signal CK2C in the next clock cycle of the clock cycle.
- the counter circuit 18 refers to the up / down signal UPDN and the granularity designation signal in synchronization with the divided clock signal CK2C.
- the count value is the count width designated by the granularity designation signal. Increment only.
- the counter circuit 18 decrements the count value by the count width designated by the granularity designation signal.
- FIG. 7 is a timing chart showing an example of the operation of the DLL circuit 70 (FIG. 6) according to the present embodiment.
- the division ratio of the divided clock signals CK1, CK2, and CK2C generated by the variable frequency dividing circuit 26 in the default state is set to 4.
- control circuit 17 refers to the phase determination signal output from the phase determination circuit 24 in synchronization with the rising edge of the divided clock signal CK1 at time t1, and outputs the output phase of the DLL circuit 70 (ie, Since the phase difference between the input clock signal CK and the output clock signal CKOUT is larger than the target phase, the low-level up / down signal UPDN is output.
- the detection circuit 28 detects that the up / down signal UPDN output from the control circuit 17 has fluctuated before and after the counter circuit 18 changes the count value, and outputs a high-level target edge detection signal TE. .
- the granularity changing circuit 16 refers to the target edge detection signal TE output from the detection circuit 28 in synchronization with the rising edge of the divided clock signal CK2 at time t2, and the target edge detection signal TE is at a high level.
- the counter circuit 18 changes the count width when the count value is updated from 16 to 4, and outputs a granularity designation signal indicating the changed count width 4.
- variable frequency dividing circuit 26 When the variable frequency dividing circuit 26 detects that the target edge detection signal TE has transitioned from the low level to the high level at the time t1, the variable frequency dividing circuit 26 sets the frequency dividing ratio of the frequency divided clock signal CK2C to 5 in the clock cycle.
- the division ratio of CK1 and CK2 is larger than 4.
- the variable frequency dividing circuit 26 sets the frequency dividing ratio of the frequency-divided clock signals CK1 and CK2 to 5 in the clock cycle next to the clock cycle, which is larger than the frequency dividing ratio 4 of the frequency-divided clock signal CK2C.
- the counter circuit 18 refers to the up / down signal UPDN and the granularity designation signal in synchronization with the rising edge of the divided clock signal CK2C at time t3. Since the up / down signal UPDN is at the low level and the granularity designation signal indicates the count width 4, the counter circuit 18 decrements the count value by the count width 4.
- the locked state is reached in a period in which three cycles of the divided clock signal with the division ratio 4 and two cycles of the divided clock signal with the division ratio 6 are added. That is, the time until the lock state is reached (lock time) corresponds to 22 cycles of the input clock signal CK.
- the detection circuit 28 when the detection circuit 28 detects that the phase difference between the output clock signal CKOUT and the input clock signal CK has crossed the target phase (that is, the magnitude relationship is reversed), the detection circuit 28 Generates a high-level target edge detection signal TE.
- the variable frequency dividing circuit 26 is a frequency dividing circuit that can change the frequency dividing ratio as necessary. Further, a target edge detection signal TE that is an output signal of the detection circuit 28 is connected to the variable frequency dividing circuit 26.
- the variable frequency dividing circuit 26 has a period of n times the input clock signal CLK (frequency dividing ratio n, in the example shown in FIG. 7, the frequency dividing ratio 4) in the normal time when the magnitude reversal is not detected. A peripheral clock signal is generated.
- the detection circuit 28 When the DLL circuit 70 starts the locking operation and the counter circuit 18 adjusts the count value and the above-described magnitude relationship is reversed, the detection circuit 28 generates the high-level target edge detection signal TE.
- the variable frequency dividing circuit 26 delays the divided clock signal CK2C by an arbitrary period (one period of the input clock signal CK in FIG. 7) and sets the setup time tCR. Secure.
- the divided clock signal CK2C is delayed, the change in the variable delay circuit 22 is delayed, so that the feedback delay is also extended. Therefore, the next divided clock signal CK1 is also delayed by the setup time tCR. As a result, the frequency dividing period is extended only when the target edge is detected.
- the DLL circuit 70 of the present embodiment regardless of whether the count width is changed or not, the DLL circuit (FIG. 1) according to Study Example 1 in which the division period is always added with the setup time tCR, or the count width is changed. As compared with the DLL circuit (FIG. 3) according to Example 2 in which one period of the divided clock is assigned as the setup time tCR at the time, the lock time can be shortened.
- the divided clock that is constantly added with the counter granularity change time tCR is increased only by changing the counter granularity.
- the overhead when changing the counter granularity is shortened, and the DLL circuit It is possible to greatly reduce the time required for the phase lock.
- FIG. 8 is a table comparing the performance of the DLL circuit according to the first and second study examples and the performance of the DLL circuit 70 according to the present embodiment.
- the variable delay circuit was adjusted with an 11-bit counter, and the count width (granularity) was changed as shown in FIG. Further, the frequency division ratio of the divided clock signal of the DLL circuit (FIG. 1) of the study example 1 is set to 10, and the frequency division ratio of the divided clock signal of the DLL circuit of the study example 2 (FIG. 3) is set to 8. Furthermore, the division ratio of the divided clock signal of the DLL circuit 70 of the present embodiment is set to 8 by default, and the division ratio when the division ratio is changed and increased is set to 10. That is, the setup time (counter width change time) tCR is set to two cycles of the input clock signal CK.
- the count value was updated 32 times when the count width was 64, and the count value was updated four times when the count width was 16, 4, and 1.
- the number of changes of the count width is 3 (64 ⁇ 16, 16 ⁇ 4, 4 ⁇ 1).
- the reduction rate of the number of lock cycles for the DLLs in the examination examples 1 and 2 is approximately expressed by the following equation.
- Reduction rate for the DLL circuit of Study Example 1 tCR (number of cycles) / frequency division ratio; Reduction rate for DLL circuit in Study Example 2: Count width change count / count total update count
- the reduction rate increases as the setup time tCR increases for the DLL circuit of the study example 1, while the DLL circuit of the study example 2
- the reduction rate increases as the number of count width switching increases.
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Abstract
Description
本発明は、日本国特許出願:特願2013-014453号(2013年01月29日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、DLL(Delay Locked Loop)回路および半導体装置に関し、例えば、半導体記憶装置に搭載されるDLL回路およびDLL回路を備えた半導体記憶装置に関する。
第1の検討例(検討例1)に係るDLL回路について、図面を参照して説明する。図1は、検討例1に係るデジタル制御型のDLLの構成を示すブロック図である。図1を参照すると、DLL回路は、粒度変更回路116、制御回路117、カウンタ回路118、デコーダ回路119、可変遅延回路122、位相判定回路124、分周回路126、および、検出回路128を備えている。
第2の検討例(検討例2)に係るDLL回路について、図面を参照して説明する。図3は、検討例2に係るデジタル制御型のDLL回路の構成を示すブロック図である。
第1のクロック信号を可変な分周比で分周することにより第1の分周クロック信号および第2の分周クロック信号を生成する可変分周回路と、
前記第1の分周クロック信号に同期してカウント幅を変更する粒度変更回路と、
前記第2の分周クロック信号に同期してカウント値を前記カウント幅に応じて更新するカウンタ回路と、
前記カウント値に応じた遅延量に基づいて前記第1のクロック信号を遅延させることにより第2のクロック信号を生成する可変遅延回路と、を備え、
前記第1のクロック信号と前記第2のクロック信号の位相差と所定の値との大小関係が前記カウント値の更新前後で逆転した場合、前記粒度変更回路は前記カウント幅を変更し、前記可変分周回路は前記第2の分周クロック信号の分周比を前記第1の分周クロック信号の分周比よりも大きくする。
第1の実施形態に係るDLL(Delay Locked Loop)回路について、図面を参照して説明する。始めに、本実施形態に係るDLL回路を備えた半導体装置(例えば、DRAM等のメモリ装置)の全体構成について説明する。
検討例2のDLL回路に対する削減率:カウント幅変更回数/カウント総更新回数
10 半導体装置
11 クロック端子
12 コマンド端子
13 アドレス端子
14 データ入出力端子
15 データストローブ端子
16、116 粒度変更回路
17、117 制御回路
18、118 カウンタ回路
19、119 デコーダ回路
22、122 可変遅延回路
24、124 位相判定回路
26 可変分周回路
28、128 検出回路
31 コマンドバッファ
32 コマンドデコーダ
40 クロックバッファ
41 アドレスバッファ
51 ロウ系制御回路
52 カラム系制御回路
53 リフレッシュ回路(REF)
60 メモリセルアレイ
61 センス回路
62 リードライトアンプ(RWAMP)
63 FIFO
64 入出力回路
65 DQS入出力回路
70 DLL回路
71 DLLリフレッシュ制御回路
72 レプリカ回路
73、74 クロック出力制御回路
73a 出力ノード
75 バッファ回路
76 クロックツリー
77 ROM
126 分周回路
ACT アクティブコマンド信号、内部アクティブコマンド
ADD アドレス信号
BL ビット線
/CAS カラムアドレスストローブ信号
CK 入力クロック信号
CK1~CK3、CK2C 分周クロック信号
CKE クロックイネーブル信号
CKOUT 出力クロック信号
CKS 外部クロック信号
CMD コマンド信号
CNT カウント信号
/CS チップセレクト信号
DLLEnable DLLイネーブルコマンド
DLL_ON DLLオン信号
DLL_OSC_Enable オシレータ起動信号
DLL_START DLLスタート信号
DQS データストローブ信号
DQS_DATA データストローブデータ信号
ICKE 内部クロックイネーブル信号
ICLK 内部クロック信号
IDLE アイドルコマンド信号、内部アイドルコマンド
LCLK、LCLK_OUT1、LCLK_OUT2 内部クロック信号
MC メモリセル
MIO メインI/O線
/RAS ロウアドレスストローブ信号
READ リードコマンド、内部リードコマンド
/RESET リセット信号
SA センスアンプ
SelfEnable セルフリフレッシュコマンド
SREF_START セルフリフレッシュ開始信号
TE ターゲットエッジ検出信号
UPDN アップダウン信号
/WE ライトイネーブル信号
WL ワード線
WRITE 内部ライトコマンド
Claims (9)
- 第1のクロック信号を可変な分周比で分周することにより第1の分周クロック信号および第2の分周クロック信号を生成する可変分周回路と、
前記第1の分周クロック信号に同期してカウント幅を変更する粒度変更回路と、
前記第2の分周クロック信号に同期してカウント値を前記カウント幅に応じて更新するカウンタ回路と、
前記カウント値に応じた遅延量に基づいて前記第1のクロック信号を遅延させることにより第2のクロック信号を生成する可変遅延回路と、を備え、
前記第1のクロック信号と前記第2のクロック信号の位相差と所定の値との大小関係が前記カウント値の更新前後で逆転した場合、前記粒度変更回路は前記カウント幅を変更し、前記可変分周回路は前記第2の分周クロック信号の分周比を前記第1の分周クロック信号の分周比よりも大きくする、DLL(Delay Locked Loop)回路。 - 前記可変分周回路は、前記第2の分周クロック信号の分周比を前記第1の分周クロック信号の分周比よりも大きした後、前記第1の分周クロック信号の分周比を前記第2の分周クロック信号の分周比よりも大きくする、請求項1に記載のDLL回路。
- 前記可変分周回路は、前記第1のクロック信号を同一の分周比で分周することにより位相差のない第1の分周クロック信号および第2の分周クロック信号を生成し、前記大小関係が前記カウント値の更新前後で逆転した分周クロック周期において、前記第2の分周クロック信号の分周比を前記第1の分周クロック信号の分周比よりも大きくし、該分周クロック周期の次の分周クロック周期において、前記第1の分周クロック信号の分周比を前記第2の分周クロック信号の分周比よりも大きくする、請求項2に記載のDLL回路。
- 前記可変分周回路は、前記第1のクロック信号を前記同一の分周比で分周することにより前記第1の分周クロック信号および前記第2の分周クロック信号よりも位相の進んだ第3の分周クロック信号を生成する、請求項3に記載のDLL回路。
- 前記第3の分周クロック信号に同期して前記位相判定回路による判定結果を参照し、前記位相差と前記所定の値との大小関係を示すアップダウン信号を生成する制御回路をさらに備え、
前記カウンタ回路は、前記位相差が前記所定の値よりも小さいことを前記アップダウン信号が示す場合、前記カウント値を前記カウント幅だけインクリメントし、前記位相差が前記所定の値よりも大きいことを前記アップダウン信号が示す場合、前記カウント値を前記カウント幅だけデクリメントする、請求項4に記載のDLL回路。 - 前記可変分周回路は、前記大小関係が前記カウント値の更新前後で逆転した分周クロック周期において、前記第2の分周クロック信号の分周比を前記第1の分周クロック信号および前記第3の分周クロック信号の分周比よりも大きくし、該分周クロック周期の次の分周クロック周期において、前記第1の分周クロック信号および前記第3の分周クロック信号の分周比を前記第2の分周クロック信号の分周比よりも大きくする、請求項4または5に記載のDLL回路。
- 前記第1のクロック信号と前記第2のクロック信号との位相差が所定の値よりも大きいか否かを判定する位相判定回路を備える、請求項1ないし6のいずれか1項に記載のDLL回路。
- 前記位相判定回路の判定結果に基づいて、前記カウンタ回路が前記カウント値を更新する前後で前記位相差と前記所定の値との大小関係が逆転したことを検出し、検出結果を前記可変分周回路および前記粒度変更回路に通知する検出回路を備える、請求項7に記載のDLL回路。
- 前記第1のクロック信号として外部クロック信号を受信し、前記第2のクロック信号として該外部クロック信号に同期した内部クロック信号を生成する、請求項1ないし8のいずれか1項に記載のDLL回路と、
出力データを記憶するメモリセルと、
前記出力データを前記内部クロック信号に同期して外部に出力する出力バッファと、を備える、半導体装置。
Priority Applications (2)
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KR1020157022649A KR20150110698A (ko) | 2013-01-29 | 2014-01-28 | Dll 회로 및 반도체 장치 |
US14/762,532 US9543967B2 (en) | 2013-01-29 | 2014-01-28 | DLL circuit and semiconductor device |
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JP2013-014453 | 2013-01-29 | ||
JP2013014453 | 2013-01-29 |
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PCT/JP2014/051810 WO2014119558A1 (ja) | 2013-01-29 | 2014-01-28 | Dll回路および半導体装置 |
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US (1) | US9543967B2 (ja) |
KR (1) | KR20150110698A (ja) |
TW (1) | TW201503597A (ja) |
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Cited By (2)
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US10965292B1 (en) | 2020-06-08 | 2021-03-30 | Winbond Electronics Corp. | Delay-locked loop device and operation method therefor |
JP7369829B1 (ja) | 2022-07-06 | 2023-10-26 | 華邦電子股▲ふん▼有限公司 | 制御回路、半導体記憶装置及び半導体記憶装置の制御方法。 |
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KR20160048512A (ko) * | 2014-10-24 | 2016-05-04 | 에스케이하이닉스 주식회사 | 타이밍 마진 자체 조정이 가능한 반도체 장치 |
US9601182B2 (en) | 2015-05-08 | 2017-03-21 | Micron Technology, Inc. | Frequency synthesis for memory input-output operations |
US9584105B1 (en) * | 2016-03-10 | 2017-02-28 | Analog Devices, Inc. | Timing generator for generating high resolution pulses having arbitrary widths |
US10110240B1 (en) * | 2017-10-17 | 2018-10-23 | Micron Technology, Inc. | DLL circuit having variable clock divider |
KR101989696B1 (ko) | 2017-11-30 | 2019-09-30 | 연세대학교 산학협력단 | 감소된 정적 위상 오프셋을 갖는 지연 고정 루프 장치 및 그 동작 방법 |
US10339997B1 (en) * | 2017-12-18 | 2019-07-02 | Micron Technology, Inc. | Multi-phase clock division |
US10403340B2 (en) * | 2018-02-07 | 2019-09-03 | Micron Technology, Inc. | Techniques for command synchronization in a memory device |
US10991411B2 (en) | 2018-08-17 | 2021-04-27 | Micron Technology, Inc. | Method and apparatuses for performing a voltage adjustment operation on a section of memory cells based on a quantity of access operations |
US10431281B1 (en) * | 2018-08-17 | 2019-10-01 | Micron Technology, Inc. | Access schemes for section-based data protection in a memory device |
KR20200097903A (ko) | 2019-02-11 | 2020-08-20 | 삼성전자주식회사 | 비휘발성 메모리 장치 |
US10516403B1 (en) * | 2019-02-27 | 2019-12-24 | Ciena Corporation | High-order phase tracking loop with segmented proportional and integral controls |
CN110445492B (zh) * | 2019-09-09 | 2023-04-07 | Oppo广东移动通信有限公司 | 跨时钟域分频时钟保护电路、分频电路、方法及终端设备 |
US10892764B1 (en) | 2020-08-14 | 2021-01-12 | Winbond Electronics Corp. | Delay locked loop device and update method thereof |
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- 2014-01-28 KR KR1020157022649A patent/KR20150110698A/ko not_active Application Discontinuation
- 2014-01-28 WO PCT/JP2014/051810 patent/WO2014119558A1/ja active Application Filing
- 2014-01-28 TW TW103103210A patent/TW201503597A/zh unknown
- 2014-01-28 US US14/762,532 patent/US9543967B2/en active Active
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Also Published As
Publication number | Publication date |
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TW201503597A (zh) | 2015-01-16 |
US20150372683A1 (en) | 2015-12-24 |
TWI563803B (ja) | 2016-12-21 |
KR20150110698A (ko) | 2015-10-02 |
US9543967B2 (en) | 2017-01-10 |
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