WO2005112261A1 - 選択回路 - Google Patents
選択回路 Download PDFInfo
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- WO2005112261A1 WO2005112261A1 PCT/JP2005/008670 JP2005008670W WO2005112261A1 WO 2005112261 A1 WO2005112261 A1 WO 2005112261A1 JP 2005008670 W JP2005008670 W JP 2005008670W WO 2005112261 A1 WO2005112261 A1 WO 2005112261A1
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- signal
- input
- clock input
- bit
- selection circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
Definitions
- the present invention relates to an input signal selection circuit that selects and outputs one of a plurality of input signals based on a switching signal input from outside.
- Fig. 10 shows an example of a conventional selection circuit.
- the selection circuit shown in FIG. 10 is configured by forming a plurality of multiplexer cells in a tree shape, and selectively outputs one of the clocks of one of a plurality of clock input signals.
- a basic multiplexer cell is composed of cells having two data inputs, one switching signal input, and selected data output.
- the selection circuit when there are two clock input signals to be selected, the selection circuit has a configuration as shown in FIG. 11 and, regardless of which clock input signal is selected, it must pass through one stage of the multiplexer cell. This is it.
- the selection circuit When the number of clock input signals to be selected is four, the selection circuit has a configuration as shown in FIG. 12, and no matter which clock input signal is selected, the selection circuit must pass through two stages of multiplexer cells. ⁇ It comes.
- the clock input signal to be selected is N bits, and no matter which clock input signal is selected, the multiplexer cell is placed in log N stages.
- FIG. 13 shows a detailed configuration of a basic two-input multiplexer cell.
- Tpl to Tp6 indicate Pch transistors
- Tnl to Tn6 indicate Nch transistors.
- the multiplexer cell passes through the log N stages until the clock input signal is selected and output.
- the number of transistors passing through is 2
- Patent Document 1 JP-A-6-197102 (page 5, FIG. 1)
- the present invention has been made to solve the above problem, and when one signal is selected from two or more input clock signals, the influence of a voltage drop or process variation is reduced, and malfunction is reduced.
- the object is to provide a selection circuit, unlikely to occur.
- the selection circuit provides an externally provided selection circuit.
- a selection circuit that receives a plurality of clock input signals and a switching signal as inputs, and selects and outputs one of the plurality of clock input signals based on the switching signal, wherein the switching signal includes the plurality of clocks.
- a decoding unit that converts the internal control signal into an internal control signal having the same bit width as the input signal; an operation using the plurality of clock input signals; and the internal control signal generated by the decoding unit;
- a signal selection operation unit for selecting one of the input signals.
- the decoding unit inputs the switching signal as a parallel signal of a plurality of bits, and An internal control signal having the same signal width as the clock input signal is generated.
- the output of the internal control signal output from the decoding unit can be performed at high speed, and as a result, the time until the clock input signal is selectively output can be reduced.
- the decoding unit inputs the switching signal as a 1-bit serial signal, and Generating an internal control signal having the same signal width as the clock input signal.
- the signal selection operation unit receives each one bit of the plurality of clock input signals as an input, A tri-state buffer having the number of bits of the plurality of clock input signals, having one bit of the internal control signal corresponding to the one bit as a control input, is connected in parallel, and after selecting the parallel connection output, It is output as a signal.
- the signal selection operation section includes a first bit for each of the plurality of clock input signals, A two-input NAND corresponding to one bit of the internal control signal corresponding to one bit, and two inputs corresponding to the number of bits of the plurality of clock input signals and all outputs of the plurality of two-input NANDs are input. It has an input NAND, and outputs the output of the multi-input NAND as a selected signal.
- each of the signal selection calculation units includes one bit of the plurality of clock input signals, Two input NORs corresponding to the number of bits of the plurality of clock input signals, and one output of the internal control signal corresponding to a bit, and all outputs of the plurality of two-input NORs are input. And outputs the output of the multi-input NOR as a selected signal.
- the circuit configuration can be simplified and power consumption can be reduced. Can significantly reduce the delay value required for. Furthermore, fluctuations in delay time due to voltage drops and process variations can be suppressed as much as possible, and as a result, malfunctions of subsequent circuits can be prevented.
- FIG. 1 is a block diagram showing a configuration of a selection circuit according to the present invention.
- FIG. 2 is a diagram showing a detailed configuration of a selection circuit according to the first embodiment of the present invention.
- FIG. 3 is a circuit diagram of a normal rotation control tri-state buffer.
- FIG. 4 is a configuration diagram of a selection circuit when the tristate buffer of FIG. 2 is converted to inversion control.
- FIG. 5 is a circuit diagram of an inversion control tri-state buffer.
- FIG. 6 is a diagram showing a detailed configuration of a selection circuit according to a second embodiment of the present invention.
- FIG. 7 is a circuit diagram of a multi-input NAND according to the second embodiment.
- FIG. 8 is a diagram showing a detailed configuration of a selection circuit according to a third embodiment of the present invention.
- FIG. 9 is a circuit diagram of a multi-input NOR according to the third embodiment.
- FIG. 10 is a configuration diagram of a conventional selection circuit.
- FIG. 11 is a configuration diagram of a conventional 2to1 selection circuit.
- FIG. 12 is a configuration diagram of a conventional 4tol selection circuit.
- FIG. 13 is a basic multiplexer cell circuit diagram.
- Tpx ⁇ channel transistor (X is an integer from 0 to ⁇ )
- FIG. 1 is a block diagram showing a schematic configuration of a selection circuit according to the present invention.
- the selection circuit includes a signal selection operation unit 10 and a decoding unit 20.
- the signal selection calculation unit 10 receives a plurality of clock input signals 30a to be selected, and receives one of the plurality of clock input signals based on an internal control signal 20a output from the decoding unit 20. And outputs it as output signal 30c.
- the clock input signal input to the signal selection circuit operation unit 10 is N bits (N is an integer of 2 or more).
- the decoding unit 20 receives the switching signal 30b as input, generates an internal control signal 20a for controlling selection of a clock input signal, and outputs it to the signal selection calculation unit 10.
- FIG. 2 shows a detailed configuration diagram of the selection circuit according to the first embodiment.
- the same components as those in FIG. 1 are denoted by the same reference numerals.
- the signal selection operation unit 10 shown in FIG. 2 receives one bit of each of the plurality of clock input signals 30a and controls the one-bit internal control signal 20a output from the decoding unit 20 corresponding to the one bit.
- the tri-state buffers 101 for the number of bits of the plurality of clock input signals to be input are connected in parallel, and the parallel-connected output is output as a selected signal. For example, by setting only the value of the internal control signal to the tri-state buffer corresponding to the clock input signal to be selected to "1" and setting the value of the internal control signal to the other tri-state buffers to "0", Clock input signal can be selected.
- FIG. 3 shows a transistor-level structure of tristate buffer 101 shown in FIG.
- the number of transistors through which the input signal A passes is one of Tp2 or ⁇ ⁇ 2. Since the control signal has been determined, Tpl, Tp3, Tnl, and ⁇ 3 are already conducting or OFF. Therefore, when the signal selection calculation unit 10 adopts the configuration shown in FIG. 2, only one path of Tp2 or ⁇ 2 is provided until the clock signal to be selected is output. In other words, the delay time required for selecting and outputting the clock input signal is always a delay time equivalent to one transistor stage, depending on the number of signal inputs.
- the decoding unit 20 that decodes the switching signal 30b and outputs the internal control signal 20a, the plurality of clock input signals 30a, and the decoding unit A signal selection operation unit 10 that performs an operation using an internal control signal 20a output from 20 and selects and outputs a signal 30c corresponding to the switching signal 30b from the plurality of clock input signals 30a.
- the configuration of the signal selection operation unit can be simplified compared to the conventional clock selection circuit, and an increase in delay time can be prevented.
- the signal selection calculation unit 10 receives the one bit of each of the plurality of clock input signals 30a and one bit of an internal control signal corresponding to the one-bit clock input signal, and inputs the plurality of clocks.
- the tri-state buffers 101 for the number of bits of the input signal are connected in parallel, and the parallel connection output is selected and output as a signal, so that the clock signal can be selected with a simple circuit configuration. Further, the number of transistor stages that pass through until the clock input signal is selectively output can be reduced.
- the tri-state buffer included in the signal selection calculation unit 10 may perform the force reversal control described for the one that performs the normal rotation control.
- FIG. 4 shows a detailed configuration of the selection circuit when the signal selection operation unit 10 is configured by a tri-state buffer of inversion control.
- the same components as those in FIG. 1 are denoted by the same reference numerals.
- the signal selection operation unit 10 shown in FIG. 4 receives one bit of each of the plurality of clock input signals 30a and an input obtained by inverting the internal control signal 20a corresponding to the one bit.
- a tri-state buffer 102 for the number of signal bits is connected in parallel, and the parallel connection output is output as a selected signal.
- the internal control signal to the tri-state buffer corresponding to the clock input signal to be selected is output. By setting only the value to “0” and the values of the other internal control signals to “1”, any clock input signal can be output.
- FIG. 5 shows a transistor-level structure of tristate buffer 102 shown in FIG.
- the number of transistors through which the input signal A passes is one of Tp2 or ⁇ 2, and since the control signal is determined, Tpl, Tp3, Tnl, and ⁇ 3 are conductive or OFF. . Therefore, when the signal selection calculation unit 10 has the configuration shown in FIG. 4, the path to output the clock signal to be selected is only one stage of Tp2 or ⁇ 2.
- FIG. 6 is a diagram showing a detailed configuration of the selection circuit according to the second embodiment. 6, the same components as those in FIG. 1 are denoted by the same reference numerals.
- the signal selection operation unit 10 shown in FIG. 6 receives one bit of each of the plurality of clock input signals 30a and an internal control signal 20a corresponding to the one bit, and inputs the bits of the plurality of clock input signals 30a. It has a several-input two-input NAND 103 and a multi-input NAND 104 to which all outputs of the plurality of two-input NANDs 103 are input, and outputs the output of the multi-input NAND 104 as a selected signal.
- the 2-input NAND with the internal control signal 20a of which the value is ⁇ 0 '' is capable of transmitting the corresponding clock signal.
- the 2-input NAND with the internal control signal 20a of which the value is ⁇ 0 '' is the corresponding input clock. "1" is propagated regardless of the signal.
- the value is “1” among the plurality of two-input NANDs 103.
- FIG. 7 shows the structure of the multi-input NAND 104 at the transistor level.
- the output result of 4 depends on input 1. That is, when input 1 is “1”, the result of inversion of input 1 is output via the transistor TnO, and when input 1 is “0”, via the transistor ⁇ .
- the clock input signal 30a passes through one stage of the Pch or Nch transistor. This is not limited to input 1, but the same applies to other inputs.
- one input of the two-input NAND 103 in the preceding stage is in a state in which the internal control signal 20a corresponding to the clock input signal 30a is determined, so that the clock propagation time Affects the delay time of one stage of the transistor due to the transition of the clock input signal.
- the outputs of the two-input NAND from other than the two-input NAND transmitting the selected clock input signal are all “1”. Since it is determined, in the multi-input NAND 104, the influence on the clock propagation time is the delay time of one stage of the transistor due to the transition of the selected clock input signal. Therefore, as a whole selection circuit, a delay value of two stages of transistors is generated through two NAND gates.
- the logic is once inverted by the preceding two-input NAND gate 103 and is again inverted by the subsequent multi-input NAND gate 104.
- the transistors passing through the transistors in the NAND gates of the preceding and succeeding stages are Pch transistor + Nch transistor or Nch transistor + Pch transistor, respectively, and the Pch transistor and Nch transistor are each one stage. It is configured to intervene.
- the rising and falling edges of the clock signal can pass through the same transistor, and as a result, variations in the delay value due to the difference in the configuration of the Pch transistor and the Nch transistor can be suppressed, and the duty cycle of the clock signal can be reduced.
- the design that does not break down the ratio of the high level period and the low level period) is possible.
- the signal selection operation unit 10 receives one bit of each of the plurality of clock input signals and one bit of each decode signal corresponding to the one bit.
- a two-input NAND 103 corresponding to the number of bits of the plurality of clock input signals, and a multi-input NAND 104 to which all outputs of the plurality of two-input NAND 103 are input, and after selecting the output of the multi-input NAND 104 Since the signal is output as a signal, it is possible to reduce the number of transistor stages that must pass before the clock input signal is selectively output.
- FIG. 8 is a diagram showing a detailed configuration of the selection circuit according to the third embodiment. 8, the same components as those in FIG. 1 are denoted by the same reference numerals.
- the signal selection calculation unit 10 shown in FIG. 8 receives the one bit of each of the plurality of clock input signals 30a and the internal control signal 20a corresponding to the one bit as inputs. And a multi-input NOR gate 106 that receives all outputs of the plurality of 2-input NORs 105, and outputs the output of the multi-input NOR 106 as a selected signal. Is what you do.
- FIG. 9 shows the structure of the multi-input NOR 106 at the transistor level.
- the output result of the multi-input NOR 106 is determined by the input 1. That is, when the input 1 is “0”, the result of inversion of the input 1 is output via the transistor TnO, and when the input 1 is “1”, the result is output via the transistor ⁇ .
- the clock input signal 30a passes through one stage of the Pch or Nch transistor. This is true not only for input 1 but for any other input.
- one input of the preceding two-input NOR 105 is in a state where the internal control signal 20a corresponding to the clock input signal 30a is determined, so that the clock propagation time
- the effect is the delay time of one transistor stage due to the transition of the clock input signal.
- the outputs of the two-input NOR other than the two-input NOR that propagate the selected clock input signal are all set to ⁇ 0 ''. Affecting the propagation time is the delay time of one stage of the transistor due to the transition of the selected clock input signal.
- a delay value corresponding to two stages of transistors is generated through two NOR gates.
- the rising and falling edges of the clock signal can pass through the same transistor, and as a result, variations in the delay value due to the difference in the configuration between the Pch transistor and the Nch transistor can be suppressed, and the duty cycle of the clock signal can be reduced. (The ratio between the high-level period and the low-level period) is maintained.
- the signal selection calculation unit 10 receives one bit of each of the plurality of clock input signals and one bit of each decode signal corresponding to each one bit.
- a two-input NOR 105 corresponding to the number of bits of the plurality of clock input signals, and a multi-input NOR 106 which receives all outputs of the plurality of two-input NORs 105, and outputs the output of the multi-input NOR 106. Since the signal is output as the selected signal, the number of transistor stages that must pass before the clock input signal is selectively output can be reduced.
- the decoding unit 20 receives the parallel switching signal of a plurality of bits as input, and has the same signal width as the plurality of clock input signals input to the signal selection calculation unit 10. In the case where the control signal is generated, the number of wirings for the switching signal increases, but the output of the internal control signal can be reduced at a high speed.
- the decoding unit 20 is configured to receive a 1-bit serial switching signal and generate an internal control signal having the same signal width as a plurality of clock input signals input to the signal selection calculating unit 10, the parallel switching signal
- the circuit scale of the decoding section increases in comparison with the case of inputting with a single input, only one switching signal wiring is sufficient, so this is effective when the wiring is congested!
- the selection circuit of the present invention is effective in reducing clock delay time until input of a plurality of clocks to be selected and power selection output. is there. It also suppresses fluctuations in the delay value of the clock signal due to process variations, and breaks the duty (ratio between the high-level period and the low-level period) of the clock signal. This is effective in achieving a circuit that can propagate signals without error and that is less likely to malfunction.
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JP2004144070 | 2004-05-13 | ||
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04319815A (ja) * | 1991-04-19 | 1992-11-10 | Nec Corp | バス回路 |
JPH06197102A (ja) * | 1992-12-25 | 1994-07-15 | Mitsubishi Electric Corp | クロック信号選択装置 |
JPH0993283A (ja) * | 1995-09-28 | 1997-04-04 | Fujitsu Ltd | 回線設定方式 |
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- 2005-05-12 WO PCT/JP2005/008670 patent/WO2005112261A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04319815A (ja) * | 1991-04-19 | 1992-11-10 | Nec Corp | バス回路 |
JPH06197102A (ja) * | 1992-12-25 | 1994-07-15 | Mitsubishi Electric Corp | クロック信号選択装置 |
JPH0993283A (ja) * | 1995-09-28 | 1997-04-04 | Fujitsu Ltd | 回線設定方式 |
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