WO2017154191A1 - 分周回路、デマルチプレクサ回路、及び半導体集積回路 - Google Patents
分周回路、デマルチプレクサ回路、及び半導体集積回路 Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M9/00—Parallel/series conversion or vice versa
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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
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
- H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
- H03K23/667—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses by switching the base during a counting cycle
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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
- H03K5/156—Arrangements in which a continuous pulse train is transformed into a train having a desired pattern
- H03K5/1565—Arrangements in which a continuous pulse train is transformed into a train having a desired pattern the output pulses having a constant duty cycle
Definitions
- the present invention relates to a frequency divider circuit, a demultiplexer circuit, and a semiconductor integrated circuit.
- the frequency dividing circuit divides the input clock signal by N and outputs a clock signal having a period N times (frequency is 1 / N times).
- FIG. 7 is a diagram illustrating a configuration example of the frequency dividing circuit.
- FIG. 7 shows an example of a frequency dividing circuit that divides an input clock signal ICK by 2 and outputs a frequency-divided clock signal OCK having a double cycle.
- the D flip-flop circuit 701 includes a D flip-flop circuit composed of two D latch circuits 701 and 702, and an inverter 703.
- the frequency divider shown in FIG. The output of the D latch circuit 701 is input to the D latch circuit 702, and the output of the D latch circuit 702 is input to the D latch circuit 701 through the inverter 703.
- the output of the D latch circuit 702 is output as the divided clock signal OCK.
- Each of the D latch circuits 701 and 702 is driven by a clock signal ICK.
- the clock input is active (true)
- the data (signal) input is transmitted to the output
- the clock input is inactive (false)
- the output state is changed. Hold. That is, in FIG. 7, when the clock signal ICK is at a low level, the D latch circuit 701 transmits the data input to the output, and the D latch circuit 702 holds the output.
- the clock signal ICK is at a high level
- the D latch circuit 701 holds the output, and the D latch circuit 702 transmits the data input to the output.
- the phase relationship between the divided clock signal OCKI and the divided clock signal OCKQ obtained by dividing the clock signal ICKI and the clock signal ICKQ having a phase difference of 90 degrees is the phase relationship shown in FIG. 8A. Or the phase relationship shown in FIG. 8B.
- the divided clock signal OCKI rises after the divided clock signal OCKI rises
- the divided clock signal OCQQ falls after the divided clock signal OCKI falls.
- the divided clock signal OCCK falls after the divided clock signal OCKI rises
- the divided clock signal OCQ rises after the divided clock signal OCKI falls. That is, the phase relationship may be the same between the input and the output, or the phase relationship may be opposite between the input and the output.
- a clock generator that divides a single clock signal by a plurality of divider circuits and generates a plurality of divided clock signals having the same phase
- the phase between the divided clock signals output from the plurality of divider circuits When a mismatch is detected, a clock generator that makes it possible to match the phases of the divided clock signals by forcing the internal states of all the frequency dividers to the same state at the same time and forcing them to match is proposed.
- Patent Document 1 Also, there has been proposed a method of dividing a phase difference pulse signal for dividing an input phase difference pulse signal composed of two input pulse train signals to generate two output pulse train signals having the same phase relationship with a longer period.
- An object of the present invention is to provide a frequency dividing circuit capable of generating a frequency-divided clock signal having a desired phase relationship based on a plurality of clock signals having a phase difference.
- the frequency divider circuit includes a first frequency divider section that divides a first clock signal to generate a first frequency-divided clock signal, and a first frequency at the same frequency as the first clock signal.
- a second frequency dividing circuit section that divides a second clock signal having a phase difference to generate a second divided clock signal, and between the first divided clock signal and the second divided clock signal
- a selection circuit that selects and outputs one of the second divided clock signal generated by the second divider circuit unit and the inverted signal of the second divided clock signal.
- the selection circuit includes the second divided clock signal and the second divided clock signal based on the phase relationship between the first divided clock signal and the second divided clock signal detected by the detection circuit. Select one of the inverted signals.
- the disclosed frequency dividing circuit includes a second divided clock signal and an inverted signal of the second divided clock signal based on a phase relationship between the first divided clock signal and the second divided clock signal. By selecting and outputting one of these, it is possible to generate and output a divided clock signal based on the second clock signal having a desired phase relationship with respect to the first divided clock signal.
- FIG. 1 is a diagram illustrating a configuration example of a frequency dividing circuit according to an embodiment of the present invention.
- FIG. 2A is a diagram illustrating an operation example of the monitor circuit in the present embodiment.
- FIG. 2B is a diagram illustrating an operation example of the monitor circuit in the present embodiment.
- FIG. 3 is a diagram illustrating a configuration example of the selection circuit in the present embodiment.
- FIG. 4 is a diagram illustrating an operation example of the frequency dividing circuit in the present embodiment.
- FIG. 5 is a diagram illustrating a configuration example of the demultiplexer circuit according to the embodiment of the present invention.
- FIG. 6 is a diagram showing a configuration example of the semiconductor integrated circuit in the embodiment of the present invention.
- FIG. 7 is a diagram illustrating a configuration example of the frequency dividing circuit.
- FIG. 8A is a diagram illustrating an operation example of the frequency dividing circuit illustrated in FIG. 7.
- FIG. 8B is a diagram illustrating an operation example of the frequency dividing circuit illustrated
- FIG. 1 is a diagram illustrating a configuration example of a frequency dividing circuit according to an embodiment of the present invention.
- the frequency dividing circuit in the present embodiment includes a first frequency dividing circuit 10, a second frequency dividing circuit 20, a monitor circuit 30, a first selection circuit 40, and a second selection circuit 50.
- the first frequency dividing circuit 10 receives the clock signal ICKI and divides the input clock signal ICKI to generate the divided clock signals WCKI and WCKIX.
- the frequency-divided clock signals WCKI and WCKIX are differential signals whose phases are inverted from each other.
- the first frequency dividing circuit 10 includes two D latch circuits 11 and 12 constituting a D flip-flop circuit.
- the D latch circuits 11 and 12 have a data input and a data output in a differential configuration.
- the positive side data output WCKIQ of the D latch circuit 11 is input to the positive side data input of the D latch circuit 12, and the negative side data output WCKIQX of the D latch circuit 11 is input to the negative side data input of the D latch circuit 12. Is done.
- the positive data output WCKI of the D latch circuit 12 is input to the negative data input of the D latch circuit 11, and the negative data output WCKIX of the D latch circuit 12 is input to the positive data input of the D latch circuit 11. Is input.
- Each of the D latch circuits 11 and 12 is driven by a clock signal ICKI.
- the clock input is active (true)
- the data (signal) input is transmitted to the output.
- the clock input is inactive (false)
- the output state is changed. Hold. That is, in the first frequency dividing circuit 10, when the clock signal ICKI is at a low level, the D latch circuit 11 transmits the data input to the data output, and the D latch circuit 12 holds the data output.
- the clock signal ICKI is at a high level
- the D latch circuit 11 holds the data output, and the D latch circuit 12 transmits the data input to the data output.
- the data outputs WCKI and WCKIX of the D latch circuit 12 as the frequency-divided clock signal are inverted.
- a divided clock signal WCKI obtained by dividing the input clock signal ICKI by 2 and a divided clock signal WCKIX that is an inverted signal of the divided clock signal WCKI are generated.
- the second frequency dividing circuit 20 receives the clock signal ICKQ and divides the input clock signal ICKQ to generate the divided clock signals WCKQ and WCKQX.
- the frequency-divided clock signals WCKQ and WCKQX are differential signals whose phases are inverted from each other.
- the clock signal ICKQ is a clock signal having the same frequency and a constant phase difference with respect to the clock signal ICKQ.
- the clock signal ICKQ is a clock signal whose phase is delayed by 90 degrees from the clock signal ICKI. To do.
- the second frequency dividing circuit 20 has two D latch circuits 21 and 22 constituting a D flip-flop circuit.
- the D latch circuits 21 and 22 have a differential configuration for data input and data output.
- the positive side data output WCKQQ of the D latch circuit 21 is input to the positive side data input of the D latch circuit 22, and the negative side data output WCKQQX of the D latch circuit 21 is input to the negative side data input of the D latch circuit 22. Is done.
- the positive data output WCKQ of the D latch circuit 22 is input to the negative data input of the D latch circuit 21, and the negative data output WCKQX of the D latch circuit 22 is input to the positive data input of the D latch circuit 21. Is input.
- Each of the D latch circuits 21 and 22 is driven by the clock signal ICKQ.
- the clock input is active (true)
- the data (signal) input is transmitted to the output
- the clock input is inactive (false)
- the output state is changed. Hold. That is, in the second frequency dividing circuit 20, when the clock signal ICKQ is at a low level, the D latch circuit 21 transmits the data input to the data output, and the D latch circuit 22 holds the data output.
- the clock signal ICKQ is at a high level
- the D latch circuit 21 holds the data output, and the D latch circuit 22 transmits the data input to the data output.
- the second frequency dividing circuit 20 every time the clock signal ICKQ rises (changes from low level to high level), the data outputs WCKQ and WCKQX of the D latch circuit 22 as frequency divided clock signals are inverted. As a result, a divided clock signal WCKQ obtained by dividing the input clock signal ICKQ by two and a divided clock signal WCKQX which is an inverted signal of the divided clock signal WCKQ are generated.
- the monitor circuit 30 detects the phase relationship between the divided clock signal WCKI generated by the first divider circuit 10 and the divided clock signal WCKQ generated by the second divider circuit 20.
- the monitor circuit 30 outputs a monitor signal MONOUT indicating the phase relationship between the divided clock signal WCKI and the divided clock signal WCKQ according to the detected phase relationship.
- the monitor circuit 30 has two D latch circuits 31 and 32.
- the frequency-divided clock signal WCKI generated by the first frequency divider circuit 10 is input to the data input of the D latch circuit 31, and the data output of the D latch circuit 31 is input to the data input of the D latch circuit 32.
- the data output of the D latch circuit 32 is output as the monitor signal MONOUT.
- Each of the D latch circuits 31 and 32 is driven by the data output WCKQQ on the positive side of the D latch circuit 21 included in the second frequency divider circuit 20.
- the data output WCKQQ as the clock input is active (true)
- the data ( Signal) input is transmitted to the output, and the output state is maintained when the clock input is inactive (false). That is, in the monitor circuit 30, when the data output WCKQQ is at a low level, the D latch circuit 31 transmits the data input to the data output, and the D latch circuit 32 holds the data output.
- the D latch circuit 31 holds the data output, and the D latch circuit 32 transmits the data input to the data output.
- the monitor circuit 30 when the phase relationship between the divided clock signal WCKI and the data output WCKQQ is as shown in FIG. 2A, the monitor signal MONOUT becomes high level.
- the divided clock signal WCKI and the data output WCKQQ have a phase relationship as shown in FIG. 2A, the divided clock signal WCKI generated by the first divider circuit 10 and the amount generated by the second divider circuit 20
- the phase relationship between the peripheral clock signal WCKQ is opposite to the phase relationship between the clock signal ICKI and the clock signal ICKQ.
- the divided clock signal WCKQ is advanced in phase from the divided clock signal WCKI.
- the monitor circuit 30 is high when the phase relationship between the divided clock signal WCKI and the divided clock signal WCKQ is opposite to the phase relationship between the clock signal ICKI and the clock signal ICKQ.
- Monitor signal MONOUT is output.
- the monitor signal MONOUT is at a low level.
- the divided clock signal WCKI and the data output WCKQQ have a phase relationship as shown in FIG. 2B, the divided clock signal WCKI generated by the first divider circuit 10 and the amount generated by the second divider circuit 20
- the phase relationship between the peripheral clock signal WCKQ is the same as the phase relationship between the clock signal ICKI and the clock signal ICKQ. That is, the divided clock signal WCKQ is delayed in phase from the divided clock signal WCKI.
- the monitor circuit 30 has a low level. Monitor signal MONOUT is output.
- the first selection circuit 40 receives the divided clock signal WCKI generated by the first divider circuit 10 and the divided clock signal WCKIX that is an inverted signal thereof.
- the first selection circuit 40 outputs one of the divided clock signal WCKI and the divided clock signal WCKIX as the divided clock signal OCKI according to the input selection signal, and the divided clock signal WCKI and the divided clock signal.
- the other of WCKIX is output as the divided clock signal OCKIX.
- the selection signal input to the first selection circuit 40 is at a low level, and the first selection circuit 40 always outputs the divided clock signal WCKI as the divided clock signal OCKI.
- the divided clock signal WCKIX is output as the divided clock signal OCKIX.
- the first selection circuit 40 since the selection of the output of the first selection circuit 40 is fixed, the first selection circuit 40 may not be provided functionally, but the first selection circuit 40, and the transmission path of each divided clock signal has the same circuit configuration, the transmission characteristics such as delay and load can be made uniform.
- the second selection circuit 50 receives the divided clock signal WCKQ generated by the second divider circuit 20 and the divided clock signal WCKIQ that is an inverted signal thereof.
- the second selection circuit 50 outputs one of the divided clock signal WCKQ and the divided clock signal WCKQX as the divided clock signal OCKQ in response to the monitor signal MONOUT input as the selection signal, and the divided clock signal WCKQ and The other of the divided clock signal WCKQX is output as the divided clock signal OCKQX.
- FIG. 3 is a diagram illustrating a configuration example of the second selection circuit 50.
- the second selection circuit 50 includes switches 51, 52, 53, 54 and an inverter 55.
- a switch 51 is disposed between the signal line of the divided clock signal WCKQ and the signal line of the divided clock signal OCKQ
- the switch 52 is provided between the signal line of the divided clock signal WCKQX and the signal line of the divided clock signal OCKQX. Is placed.
- a switch 53 is arranged between the signal line of the divided clock signal WCKQ and the signal line of the divided clock signal OCKQX, and between the signal line of the divided clock signal WCKQX and the signal line of the divided clock signal OCKQ.
- a switch 54 is arranged.
- the switches 51 and 52 are controlled by the monitor signal MONOUT supplied via the inverter 55, and the switches 53 and 54 are controlled by the monitor signal MONOUT. Specifically, the switches 51 and 52 are in a conductive state (closed state) when the monitor signal MONOUT is at a low level, and are in a non-conductive state (open state) when the monitor signal MONOUT is at a high level. On the other hand, the switches 53 and 54 are in a conductive state (closed state) when the monitor signal MONOUT is at a high level, and are in a non-conductive state (open state) when the monitor signal MONOUT is at a low level.
- the second selection circuit 50 outputs the divided clock signal WCKQ as the divided clock signal OCKQ and the divided clock signal WCKQX when the monitor signal MONOUT input as the selection signal is at the low level. Output as signal OCKQX. Further, when the monitor signal MONOUT is at a high level, the second selection circuit 50 outputs the divided clock signal WCKQX as the divided clock signal OCKQ and outputs the divided clock signal WCKQ as the divided clock signal OCKQX.
- the monitor signal MONOUT is at a low level, that is, the divided clock signal WCKI generated by the first divider circuit 10 and the divider generated by the second divider circuit 20.
- the divided clock signal WCKQ is output as the divided clock signal OCKQ.
- the monitor signal MONOUT is at a high level, that is, the phase relationship between the divided clock signal WCKI generated by the first divider circuit 10 and the divided clock signal WCKQ generated by the second divider circuit 20 is
- the divided clock signal WCKQX that is an inverted signal of the divided clock signal WCKQ is output as the divided clock signal OCKQ.
- the phase relationship between the divided clock signal WCKI generated by the first divider circuit 10 and the divided clock signal WCKQ generated by the second divider circuit 20 is It is assumed that the phase relationship between the clock signal ICKI and the clock signal ICKQ is the same, and the divided clock signal WCKQ is output as the divided clock signal OCKQ. That is, the divided clock signal WCKQ is output as the divided clock signal OCKQ so that the phase relationship with respect to the divided clock signal OCKI is the same as the phase relationship between the clock signal ICKI and the clock signal ICKQ. .
- the phase relationship between the divided clock signal WCKI and the divided clock signal WCKQ is between the clock signal ICKI and the clock signal ICKQ.
- the monitor signal MONOUT changes to a high level, and a divided clock signal WCKQX that is an inverted signal of the divided clock signal WCKQ is output as the divided clock signal OCKQ. That is, the divided clock signal WCKQX, which is an inverted signal of the divided clock signal WCKQ, is divided so that the phase relationship with respect to the divided clock signal OCKI is the same as the phase relationship between the clock signal ICKI and the clock signal ICKQ. Output as the clock signal OCKQ.
- the frequency-divided clock signal generated by the first frequency-dividing circuit 10 and the frequency-divided clock signal generated by the second frequency-dividing circuit 20 The clock signal ICKI and the clock signal ICKQ that are input by selectively outputting one of the non-inverted and inverted frequency-divided clock signals generated by the second frequency divider circuit 20 in accordance with the phase relationship between It is possible to output the divided clock signal OCKI and the divided clock signal OCKQ having the same phase relationship as that of For example, even when the phase relationship between the divided clock signal OCKI and the divided clock signal OCCKQ changes to a state different from the desired phase relationship due to instability of the clock signal, the desired phase relationship is obtained. Can be repaired automatically.
- the present embodiment is not limited to this, and the phase relationship opposite to the phase relationship between the input clock signal ICKI and the clock signal ICKQ can be obtained by appropriately changing the configuration of the second selection circuit 50 and the like. It is also possible to output the divided clock signal OCKI and the divided clock signal OCQQ.
- a demultiplexer circuit is one of the circuits to which the frequency divider circuit in the present embodiment described above is applied.
- the demultiplexer circuit is a circuit that converts a serial data signal into a parallel data signal, and a frequency-divided clock signal is used for serial-parallel conversion.
- not only a single clock signal but also a plurality of clock signals having a constant phase difference are used in order to increase the transmission speed and perform boundary detection for reproduction clock control.
- FIG. 5 is a diagram showing a configuration example of the demultiplexer circuit in the present embodiment.
- the data signal IDT0 is obtained from the serial data signal using the clock signal IDTCLK, and the inverted signal of the clock signal IDTCLK (clock signal having a phase difference of 180 degrees).
- the data signal IDT1 is acquired using Further, it is assumed that the boundary signal IBD0 is acquired from the serial data signal using the clock signal IBDCLK, and the boundary signal IBD1 is acquired using the inverted signal of the clock signal IBDCLK (clock signal having a phase difference of 180 degrees).
- the clock signal IBDCLK has a phase difference of 90 degrees with respect to the clock signal IDTCLK and is delayed in phase from the clock signal IDTCLK.
- the frequency dividing circuit 101 receives the clock signal IDTCLK and generates a divided clock signal obtained by dividing the clock signal IDTCLK by two.
- the frequency dividing circuit 101 has a configuration corresponding to the first frequency dividing circuit 10 and the first selection circuit 40 in the frequency dividing circuit shown in FIG.
- the frequency dividing circuit 102 generates a frequency-divided clock signal obtained by dividing the frequency-divided clock signal generated by the frequency-dividing circuit 101 by 2
- the frequency-dividing circuit 103 receives the frequency-divided clock signal generated by the frequency-dividing circuit 102.
- a divided clock signal divided by two is generated.
- the output of the frequency dividing circuit 103 is output as a divided clock ODTCLK together with the parallel output data signal ODT ⁇ 15: 0> and the output boundary signal OBD ⁇ 15: 0>.
- the frequency dividing circuit 104 receives the clock signal IBDCLK, and generates a divided clock signal obtained by dividing the clock signal IBDCLK by two.
- the frequency dividing circuit 104 has a configuration corresponding to the second frequency dividing circuit 20, the monitor circuit 30, and the second selection circuit 50 in the frequency dividing circuit shown in FIG.
- Dividing circuit 104 divides clock signal IBDCLK by two so that the phase relationship with respect to the divided clock signal generated by dividing circuit 101 is the same as the phase relationship between clock signal IDTCLK and clock signal IBDCLK. One of the divided clock signal and its inverted signal is selected and output.
- the demultiplexer 105 converts a 2-bit data signal composed of the data signal IDT0 and the data signal IDT1 into a 4-bit data signal using the frequency-divided clock signal generated by the frequency-dividing circuit 101.
- the demultiplexer 106 converts the 4-bit width data signal output from the demultiplexer 105 into an 8-bit width data signal using the frequency-divided clock signal generated by the frequency dividing circuit 102.
- the demultiplexer 107 converts the 8-bit width data signal output from the demultiplexer 106 into a 16-bit width data signal using the frequency-divided clock signal generated by the frequency dividing circuit 103.
- the buffer 108 outputs the 16-bit data signal output from the demultiplexer 107 as a parallel output data signal ODT ⁇ 15: 0>.
- the demultiplexer 109 converts the 2-bit boundary signal composed of the boundary signal IBD0 and the boundary signal IBD1 into a 4-bit width boundary signal using the frequency-divided clock signal generated by the frequency divider circuit 104. As described above, the demultiplexer 109 performs data conversion using the divided clock signal obtained by dividing the clock signal IBDCLK, thereby ensuring a timing margin.
- the demultiplexer 110 converts the 4-bit width boundary signal output from the demultiplexer 109 into an 8-bit width boundary signal using the frequency-divided clock signal generated by the frequency dividing circuit 102.
- the demultiplexer 111 converts the 8-bit width boundary signal output from the demultiplexer 110 into a 16-bit width boundary signal using the divided clock signal generated by the frequency dividing circuit 103.
- the buffer 112 outputs the 16-bit boundary signal output from the demultiplexer 111 as a parallel output boundary signal OBD ⁇ 15: 0>.
- the demultiplexer 109 performs data conversion using the frequency-divided clock signal obtained by frequency-dividing the clock signal IBDCLK having a certain phase difference with respect to the clock signal IDTCLK.
- data conversion can be performed using a divided clock signal having an appropriate phase relationship.
- FIG. 6 is a diagram illustrating a configuration example of the semiconductor integrated circuit according to the present embodiment.
- the semiconductor integrated circuit 201 in this embodiment includes a receiving circuit 202 having a function of a deserializer circuit that converts an input serial signal into a parallel signal, a logic circuit that receives a parallel signal (data) from the receiving circuit 202, and performs a processing operation. Internal circuit 211.
- the receiving circuit 202 includes a front end unit 203, a clock data recovery circuit 207, and a clock generation unit 208.
- the front end unit 203 includes a differential buffer 204, a comparator (comparator) 205, and a demultiplexer circuit 206.
- the differential buffer 204 receives differential input serial signals RXIN and RXINX transmitted through a transmission path or the like.
- the comparator 205 determines the sign (data) of the input serial signal.
- the demultiplexer circuit 206 is, for example, the demultiplexer circuit shown in FIG. 5, performs serial-parallel conversion on the output of the comparator 205, and outputs a parallel data signal DT, a boundary signal BD, and a reception data clock signal. .
- the parallel data signal DT and the reception data clock signal output from the demultiplexer circuit 206 are output to the internal circuit 211 as the reception data signal RXOUT and the reception clock signal RXCLK.
- the clock data recovery circuit 207 appropriately controls the phase of the internal clock signal output from the clock generation unit 208 based on the received signal.
- the clock data recovery circuit 207 is based on the data signal DT and the boundary signal BD output from the demultiplexer circuit 206, and the phase of the internal clock signal output from the clock generation unit 208 is advanced or delayed with respect to the input serial signal. It is determined whether or not. Also, the clock data recovery circuit 207 generates and outputs a phase adjustment code for advancing or delaying the phase of the internal clock signal according to the determination result.
- the clock generation unit 208 includes a clock generator 209 and a phase interpolation circuit 210.
- the clock generator 209 generates a reference clock signal and supplies it to the phase interpolation circuit 210.
- the phase interpolation circuit 210 controls the phase of the reference clock signal supplied from the clock generator 209 in accordance with the phase adjustment code from the clock data recovery circuit 207, and supplies the internal clock signal to the comparator 205 and the demultiplexer circuit 206. Output.
- the comparator 205 samples the input serial signal at an appropriate timing, and the demultiplexer circuit 206 performs serial-parallel conversion.
- the reception data signal RXOUT output from the reception circuit 202 is taken into the internal circuit 209 by the flip-flop 212 operating with the reception clock signal RXCLK, and is processed.
- the second divided clock signal and the second divided clock are based on the phase relationship between the first divided clock signal and the second divided clock signal. Select and output one of the inverted signals. Accordingly, the second divided clock signal and the inverted signal of the second divided clock signal can be appropriately selected and output so as to maintain a desired phase relationship with respect to the first divided clock signal. it can.
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Abstract
Description
図1は、本発明の一実施形態における分周回路の構成例を示す図である。本実施形態における分周回路は、第1の分周回路10、第2の分周回路20、モニタ回路30、第1の選択回路40、及び第2の選択回路50を有する。
Claims (19)
- 第1のクロック信号を分周して第1の分周クロック信号を生成する第1の分周回路部と、
前記第1のクロック信号と同じ周波数で第1の位相差を有する第2のクロック信号を分周して第2の分周クロック信号を生成する第2の分周回路部と、
前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係を検出する検出回路と、
前記検出回路により検出された前記位相関係に基づいて、前記第2の分周回路部により生成される前記第2の分周クロック信号及び前記第2の分周クロック信号の反転信号の一方を選択し出力する第1の選択回路とを有することを特徴とする分周回路。 - 前記検出回路は、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係と同じであるか否かを検出することを特徴とする請求項1記載の分周回路。
- 前記第1の選択回路は、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係と同じである場合、前記第2の分周クロック信号を選択して出力し、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係とは逆である場合、前記第2の分周クロック信号の反転信号を選択して出力することを特徴とする請求項2記載の分周回路。
- 前記検出回路は、前記第1の分周クロック信号がデータ入力に入力される第1のラッチ回路と、前記第1のラッチ回路のデータ出力からの出力信号がデータ入力に入力される第2のラッチ回路とを有し、前記第1のラッチ回路及び前記第2のラッチ回路は前記第2の分周回路部の出力信号に基づいて駆動され、前記第2のラッチ回路のデータ出力からの出力信号を前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係を示す信号として出力し、
前記第1の選択回路は、前記第2の分周クロック信号の信号線と外部への分周クロック信号の信号線との間に配置された第1のスイッチと、前記第2の分周クロック信号の反転信号の信号線と前記外部への分周クロック信号の信号線との間に配置された第2のスイッチとを有し、前記検出回路から出力される、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係を示す信号に応じて、前記第1のスイッチと前記第2のスイッチとが排他的に導通状態になることを特徴とする請求項1記載の分周回路。 - 前記第1の選択回路と同じ回路構成を有し、前記第1の分周クロック信号を常に選択し出力する第2の選択回路を有することを特徴とする請求項1~4の何れか1項に記載の分周回路。
- 前記第1の位相差は90度であることを特徴とする請求項1~4の何れか1項に記載の分周回路。
- 第1の変換クロック信号を用いて、データ信号をパラレル信号に変換する第1のデマルチプレクサ、及び前記第1の変換クロック信号とは位相が異なる第2の変換クロック信号を用いて、前記データ信号と第1の位相差を有するバウンダリ信号をパラレル信号に変換する第2のデマルチプレクサを有するデマルチプレクサ部と、
第1のクロック信号を分周して前記第1の変換クロック信号を生成し、前記第1のクロック信号と同じ周波数で前記第1の位相差を有する第2のクロック信号を分周して前記第2の変換クロック信号を生成する分周回路とを有し、
前記分周回路は、
前記第1のクロック信号を分周して第1の分周クロック信号を生成する第1の分周回路部と、
前記第2のクロック信号を分周して第2の分周クロック信号を生成する第2の分周回路部と、
前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係を検出する検出回路と、
前記検出回路により検出された前記位相関係に基づいて、前記第2の分周回路部により生成される前記第2の分周クロック信号及び前記第2の分周クロック信号の反転信号の一方を選択し出力する第1の選択回路とを有し、
前記第1の分周クロック信号を前記第1の変換クロック信号として出力し、前記第1の選択回路から出力される前記第2の分周クロック信号及び前記第2の分周クロック信号の反転信号の一方を前記第2の変換クロック信号として出力することを特徴とするデマルチプレクサ回路。 - 前記検出回路は、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係と同じであるか否かを検出することを特徴とする請求項7記載のデマルチプレクサ回路。
- 前記第1の選択回路は、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係と同じである場合、前記第2の分周クロック信号を選択して出力し、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係とは逆である場合、前記第2の分周クロック信号の反転信号を選択して出力することを特徴とする請求項8記載のデマルチプレクサ回路。
- 第1のクロック信号を分周することにより生成された第1の変換クロック信号に基づいて、第1のビット幅を有する第1の入力信号を、前記第1のビット幅より大きい第2のビット幅を有する第1の中間信号に変換する第1のデマルチプレクサと、
前記第1のクロック信号と同じ周波数で第1の位相差を有する第2のクロック信号を分周することにより生成された第2の変換クロック信号に基づいて、前記第1のビット幅を有し、前記第1の入力信号に対して前記第1の位相差を有する第2の入力信号を、前記第2のビット幅を有する第2の中間信号に変換する第2のデマルチプレクサと、
前記第1の変換クロック信号を分周することにより、前記第1の変換クロック信号よりも低い周波数を有する第3の変換クロック信号を生成する第1の分周回路と、
前記第3の変換クロック信号に基づいて、前記第1の中間信号を、前記第2のビット幅より大きい第3のビット幅を有する第1の出力信号に変換する第3のデマルチプレクサと、
前記第3の変換クロック信号に基づいて、前記第2の中間信号を、前記第3のビット幅を有する第2の出力信号に変換する第4のデマルチプレクサとを有することを特徴とするデマルチプレクサ回路。 - 前記第1の位相差は90度であることを特徴とする請求項10記載のデマルチプレクサ回路。
- 前記第1のクロック信号を分周することにより、前記第1の変換クロック信号を生成する第2の分周回路と、
前記第2のクロック信号を分周することにより、前記第2の変換クロック信号を生成する第3の分周回路とを有し、
前記第2の分周回路及び前記第3の分周回路の分周比はそれぞれ、前記第1のビット幅に対する前記第2のビット幅の比に等しいことを特徴とする請求項10又は11記載のデマルチプレクサ回路。 - 前記第1のクロック信号及び前記第2のクロック信号に基づいて、シリアル信号を前記第1の入力信号及び第2の入力信号に変換する変換回路を更に有することを特徴とする請求項12記載のデマルチプレクサ回路。
- 第1のクロック信号及び前記第1のクロック信号と同じ周波数で第1の位相差を有する第2のクロック信号を用いて入力シリアル信号をサンプリングするコンパレータと、
前記コンパレータの出力信号をパラレル信号に変換するデマルチプレクサ回路と、
受信した信号を基に前記第1のクロック信号及び前記第2のクロック信号の位相を制御するクロックデータリカバリ回路とを有し、
前記デマルチプレクサ回路は、
第1の変換クロック信号を用いて、データ信号をパラレル信号に変換する第1のデマルチプレクサ、及び前記第1の変換クロック信号とは位相が異なる第2の変換クロック信号を用いて、前記第1の位相差を有するバウンダリ信号をパラレル信号に変換する第2のデマルチプレクサを有するデマルチプレクサ部と、
前記第1のクロック信号を分周して前記第1の変換クロック信号を生成し、前記第2のクロック信号を分周して前記第2の変換クロック信号を生成する分周回路とを有し、
前記分周回路は、
前記第1のクロック信号を分周して第1の分周クロック信号を生成する第1の分周回路部と、
前記第2のクロック信号を分周して第2の分周クロック信号を生成する第2の分周回路部と、
前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係を検出する検出回路と、
前記検出回路により検出された前記位相関係に基づいて、前記第2の分周回路部により生成される前記第2の分周クロック信号及び前記第2の分周クロック信号の反転信号の一方を選択し出力する第1の選択回路とを有し、
前記第1の分周クロック信号を前記第1の変換クロック信号として出力し、前記第1の選択回路から出力される前記第2の分周クロック信号及び前記第2の分周クロック信号の反転信号の一方を前記第2の変換クロック信号として出力することを特徴とする半導体集積回路。 - 前記デマルチプレクサ回路からの前記パラレル信号を受けて処理動作を行う内部回路を有することを特徴とする請求項14記載の半導体集積回路。
- 前記検出回路は、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係と同じであるか否かを検出することを特徴とする請求項14記載の半導体集積回路。
- 前記第1の選択回路は、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係と同じである場合、前記第2の分周クロック信号を選択して出力し、前記第1の分周クロック信号と前記第2の分周クロック信号との間の位相関係が、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間の位相関係とは逆である場合、前記第2の分周クロック信号の反転信号を選択して出力することを特徴とする請求項16記載の半導体集積回路。
- 第1のクロック信号及び前記第1のクロック信号と同じ周波数で第1の位相差を有する第2のクロック信号を用いて入力シリアル信号をサンプリングすることにより、第1のビット幅を有する第1の入力信号、及び、前記第1のビット幅を有し、前記第1の入力信号に対して前記第1の位相差を有する第2の入力信号を出力するコンパレータと、
前記コンパレータの出力信号を変換するデマルチプレクサ回路と、
受信した信号を基に前記第1のクロック信号及び前記第2のクロック信号の位相を制御するクロックデータリカバリ回路とを有し、
前記デマルチプレクサ回路は、
前記第1のクロック信号を分周することにより生成された第1の変換クロック信号に基づいて、前記第1の入力信号を、前記第1のビット幅より大きい第2のビット幅を有する第1の中間信号に変換する第1のデマルチプレクサと、
前記第2のクロック信号を分周することにより生成された第2の変換クロック信号に基づいて、前記第2の入力信号を、前記第2のビット幅を有する第2の中間信号に変換する第2のデマルチプレクサと、
前記第1の変換クロック信号を分周することにより、前記第1の変換クロック信号よりも低い周波数を有する第3の変換クロック信号を生成する第1の分周回路と、
前記第3の変換クロック信号に基づいて、前記第1の中間信号を、前記第2のビット幅より大きい第3のビット幅を有する第1の出力信号に変換する第3のデマルチプレクサと、
前記第3の変換クロック信号に基づいて、前記第2の中間信号を、前記第3のビット幅を有する第2の出力信号に変換する第4のデマルチプレクサとを有することを特徴とする半導体集積回路。 - 前記デマルチプレクサ回路からの前記第1の出力信号及び第2の出力信号の少なくとも1つを受けて処理動作を行う内部回路を有することを特徴とする請求項18記載の半導体集積回路。
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