CN106571805A - Crystal oscillator, chip and crystal oscillator control method - Google Patents
Crystal oscillator, chip and crystal oscillator control method Download PDFInfo
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- CN106571805A CN106571805A CN201610920468.1A CN201610920468A CN106571805A CN 106571805 A CN106571805 A CN 106571805A CN 201610920468 A CN201610920468 A CN 201610920468A CN 106571805 A CN106571805 A CN 106571805A
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- crystal oscillator
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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Abstract
The invention discloses a crystal oscillator, a chip and a crystal oscillator control method. The crystal oscillator comprises a crystal oscillator oscillation circuit, a switching circuit, an application function circuit and multiplexing interface pins. In an external connection crystal oscillator mode, the external connection ends of the multiplexing interface pins are connected with an external passive crystal oscillator; and the internal connection ends of the multiplexing interface pins are connected with the crystal oscillator oscillation circuit through the switching circuit. In an application mode, the external connection ends of the multiplexing interface pins are connected with an application interface, and the internal connection ends of the multiplexing interface pins are connected with the application function circuit through the switching circuit. Thus, when the multiplexing interface pins do not need to be connected with the external passive crystal oscillator, the multiplexing interface pins are connected with the application function circuit through the switching control circuit, so that application functions can be realized, and the multiplexing interface pins will not be in idle states; not only can the connection of the external passive crystal oscillator be supported, but also the multiplexing (compatibility) of the interface pins can be realized; and the utilization of interface resources can be improved, and the further miniaturization development of the chip can be benefitted.
Description
Technical field
The present invention relates to integrated circuit fields, and in particular to a kind of crystal oscillator, chip and crystal oscillator controlling party
Method.
Background technology
Crystal oscillator is widely used in all kinds of handheld devices and just as one kind is inexpensive and high-precision clock reference
In prompt formula electronic product.To support external passive crystal oscillator (External Crystal Oscillator, XTAL), comprising crystal oscillator
The chip of oscillating circuit needs to provide two special input interfaces (i.e. two pin feet, hereinafter referred to as interface pin) next outside
Passive crystal oscillator, its connection diagram is shown in Figure 1, two interface pins 11 dedicated for connecting external passive crystal oscillator 12, with
Meet requirement of the chip to clock source.But the interface pin 11 for being used to connect external passive crystal oscillator in current chip is special setting
Only to use for external passive crystal oscillator, even if therefore not needing external passive crystal oscillator in certain application scenarios or certain time period
When, the two interface pins 11 then can only be on the shelf.And due to the size of input/output interface it is bright with the speed of microtechnology
The aobvious micro speed for lagging behind crystal oscillator pipe size, input/output interface resource natively seems in the chips more and more precious, because
The restriction of this function of above-mentioned two interface pin 11, gives the very high chip of versatility and customization especially FPGA (Field-
Programmable Gate Array) chip causes a certain degree of interface resource and wastes, while also limit the essence of chip
Littleization.
The content of the invention
The main technical problem to be solved in the present invention is to provide the control of a kind of crystal oscillator, chip and crystal oscillator
Method, solution is currently used for connecting the interface pin of external crystal-controlled oscillation when external crystal-controlled oscillation is not connected to, and can only leave unused, and causes interface to provide
Source wastes, and limits the problem of further smart littleization of chip.
To solve above-mentioned technical problem, the present invention provides a kind of crystal oscillator, including crystal oscillating circuit, switching electricity
Road, application function circuit and multiplex interface pin；
Under external crystal oscillator pattern, the external connection terminal of the multiplex interface pin is connected with external passive crystal oscillator, described
Switching circuit controls the multiplex interface pin inner portions connection end and is connected with the crystal oscillator oscillating circuit；
In the application mode, the external connection terminal of the multiplex interface pin is connected with application interface, the switching circuit
The inside connection end for controlling the multiplex interface pin is connected with the application function circuit.
In an embodiment of the present invention, the switching circuit is multidiameter option switch circuit；
The multiplex interface pin is connected with the outfan of the multidiameter option switch circuit, the crystal oscillating circuit and
The application function circuit is connected respectively with an input in the multi-path choice input of the multidiameter option switch.
In an embodiment of the present invention, including two multiplex interface pins.
In an embodiment of the present invention, the multidiameter option switch circuit includes two two-way selecting switch, described
Two multiplex interface pins are connected respectively with the outfan of the two-way selecting switch；The crystal oscillating circuit and the application
Functional circuit selects input to be connected with the two-way of described two two-way selecting switch respectively.
In an embodiment of the present invention, the application function circuit includes I/O buffer circuits；
Under the application model, the switching circuit controls the inside connection end of the multiplex interface pin and the I/
O buffer circuits connect.
In order to solve the above problems, present invention also offers a kind of chip, including internal circuit and crystal as above
Agitator, the crystal oscillator is connected with the internal circuit.
In order to solve the above problems, present invention also offers a kind of crystal oscillator control method, the crystal oscillator
Including crystal oscillating circuit, application function circuit, multiplex interface pin and switching circuit, methods described includes：
Under external crystal oscillator pattern, the external connection terminal of the multiplex interface pin is connected with external passive crystal oscillator, is led to
Cross the switching circuit control multiplex interface pin inner portions connection end to be connected with the crystal oscillator oscillating circuit；
In the application mode, the external connection terminal of the multiplex interface pin is connected with application interface, is cut by described
The inside connection end for changing the circuit control multiplex interface pin is connected with the application function circuit.
In an embodiment of the present invention, the switching circuit is multidiameter option switch circuit；
The multiplex interface pin is connected with the outfan of the multidiameter option switch circuit, and by the crystal oscillation
Circuit and the application function circuit connect respectively with an input in the multi-path choice input of the multidiameter option switch
Connect.
In an embodiment of the present invention, including two multiplex interface pins；
The multidiameter option switch circuit include two two-way selecting switch, described two multiplex interface pins respectively with institute
State the outfan connection of two-way selecting switch；The crystal oscillating circuit and the application function circuit are respectively with described two two
The two-way of road selecting switch selects input connection.
In an embodiment of the present invention, the application function circuit includes I/O buffer circuits；
Under the application model, inside connection end and the institute of the multiplex interface pin are controlled by the switching circuit
State the connection of I/O buffer circuits.
The invention has the beneficial effects as follows：
Crystal oscillator, chip and crystal oscillator control method that the present invention is provided, crystal oscillator shakes including crystal
Circuit, switching circuit, application function circuit and multiplex interface pin are swung, under external crystal oscillator pattern, by multiplex interface pin
External connection terminal be connected with external passive crystal oscillator, and multiplex interface pin inner portions connection end and crystal oscillator are controlled by switching circuit
Oscillating circuit connects；In the application mode, the external connection terminal of multiplex interface pin is connected with application interface, and by switching
The inside connection end of circuit control multiplex interface pin is connected with application function circuit.It can be seen that, the switching that the present invention passes through offer
Control circuit, can will be used for the multiplex interface pin being connected with external passive crystal oscillator in crystal oscillator oscillating circuit and application function electricity
Switching connection between road, therefore when being connected with external passive crystal oscillator, multiplex interface pin can be controlled and work(is applied
Corresponding application function is realized in energy circuit connection, rather than in idle state, can well support external passive crystal oscillator
Access, the multiplexing (compatibility) of interface pin is realized again, the utilization rate of interface resource can be lifted, more conducively chip is further
Smart littleization development.
Description of the drawings
Fig. 1 is existing crystal oscillator oscillating circuit and external passive crystal oscillator connection diagram；
Fig. 2 is the crystal oscillator configuration schematic diagram that the embodiment of the present invention one is provided；
Fig. 3 is the chip structure schematic diagram that the embodiment of the present invention two is provided；
Fig. 4-1 is the chip and external passive crystal oscillator connection diagram that the embodiment of the present invention two is provided；
Fig. 4-2 is the chip and application interface connection diagram that the embodiment of the present invention two is provided；
Fig. 5 is the chip structure schematic diagram that the embodiment of the present invention three is provided.
Specific embodiment
The present invention is directed to the existing interface pin single function being connected with external passive crystal oscillator, and it need not connect outside
During passive crystal oscillator, can only leave unused causes interface resource to waste, and limits the problem of chip essence littleization development, proposes that one kind realizes that this connects
The multiplexing control program of mouth pin, can well support the access of external passive crystal oscillator, and the multiplexing of interface pin can be realized again
(compatibility), lifts the utilization rate of interface resource, the more conducively further essence littleization development of chip.Below by specific embodiment
The present invention is described in further detail with reference to accompanying drawing.
Embodiment one：
A kind of crystal oscillator is present embodiments provided, shown in Figure 2, it includes crystal oscillating circuit 21, switching electricity
Road 22, application function circuit 23 and multiplex interface pin 24；It should be appreciated that the crystal oscillating circuit 21 in the present embodiment
The crystal oscillating circuit 21 of existing various structures can specifically be adopted.Switching circuit 22 in the present embodiment is specifically as follows realization
The control switching circuit of the arbitrary structures of circuit connection switching.Application function circuit 23 in the present embodiment specifically can according to work as
Front application scenarios, the selecting factors such as the function realized are needed, for example it includes but is not limited to I/O bufferings (I/O buffer) electricity
Road, wherein I/O are input/output interface.The logarithm of multiplex interface pin 24 then can be according to the company of being currently needed in the present embodiment
The number confirmation of the external passive crystal oscillator for connecing, for example, can arrange a pair of interface pin one external passive crystal oscillators of correspondence.It is based on
Crystal oscillator shown in Fig. 2, it realizes that the multiplexing functions process of multiplex interface pin 24 is as follows：
Under external crystal oscillator pattern (namely under the mode of operation for needing to be connected with external passive crystal oscillator), multiplex interface is drawn
Foot 24 external connection terminal (it is external connection terminal that interface pin is used for one end for be connected with chip exterior, for chip internal
One end of circuit connection is then internal connection end) it is connected with external passive crystal oscillator, multiplex interface is controlled by switching circuit 22 and is drawn
The inside connection end of foot 24 is connected with crystal oscillator oscillating circuit, is so achieved that the effectively connection with external passive crystal oscillator, meets core
Demand of the piece to external clock；
In the application mode (namely need not be connected with external passive crystal oscillator and currently can be connected with functional circuit and realize work(
Under applicable mode of operation), the external connection terminal of multiplex interface pin 24 is connected with application interface, by switching circuit 22
The inside connection end of control multiplex interface pin 24 is connected with application function circuit 23, be achieved in that multiplex interface pin 24 from
Crystal oscillator oscillating circuit switches to application function circuit 23 (also may act as generic interface to use), realizes that corresponding function should
With, rather than idle state is just constantly in when being connected with external passive crystal oscillator, the utilization of interface resource can be lifted
The essence littleization development of rate, more conducively chip.
Switching circuit 22 in the present embodiment can adopt multidiameter option switch circuit, multiplex interface pin 24 to select with multichannel
Select the outfan connection of on-off circuit, crystal oscillating circuit 21 and application function circuit 23 respectively with the multichannel of multidiameter option switch
The input connection in input is selected, when the input being connected with crystal oscillating circuit is connected in the control of switching circuit 22,
Then multiplex interface pin 24 is connected with crystal oscillating circuit 21, the input for controlling to be connected with application function circuit 23 is connected
When, then multiplex interface pin 24 is connected with application function circuit 23.As described above, in the present embodiment switching circuit 22 it is concrete
Structure is not limited to multidiameter option switch circuit, and concrete structure can flexibly set according to real needs.
When crystal oscillator only needs to be connected with an external passive crystal, its multiplex interface pin 24 can be included only
A pair, namely comprising two multiplex interface pins 24.But as described above, the number of interface duplex pin specifically can be according to demand
Flexibly setting.
Based on above-mentioned example structure, the multidiameter option switch circuit in the present embodiment specifically may include that two two-way select to open
Close, two multiplex interface pins 24 are connected respectively with the outfan of two-way selecting switch；Crystal oscillating circuit 21 and application function
Circuit 23 selects input to be connected with the two-way of two two-way selecting switch respectively.
In the present embodiment, when application function circuit 23 includes I/O buffer circuits, in the application mode, switching circuit 22
The inside connection end of control multiplex interface pin 24 is connected with I/O buffer circuits, to realize corresponding application of function.
The crystal oscillator that the present embodiment is provided reliable and effective can support the access of external passive crystal oscillator, realize again
The multiplexing (compatibility) of interface pin, it is to avoid the idle and caused resource wave of interface pin when external passive crystal oscillator need not be accessed
Take, the utilization rate of interface resource, the more conducively further essence littleization development of chip can be lifted.
Embodiment two：
A kind of chip is present embodiments provided, the chip can be the chip for arbitrarily including crystal oscillator, it is particularly possible to
For fpga chip, shown in Figure 3, the chip includes the crystal oscillator shown in internal circuit and embodiment one, wherein crystal
Agitator is connected with internal circuit 25.Concrete connected mode can be according to the spirit of the concrete structure of crystal oscillator and internal circuit 25
It is living to arrange.In order to be better understood from the present invention, below so that application function circuit is for I/O buffer circuits 43 as an example, the present invention is done
Further illustration.
Referring to shown in Fig. 4-1,4 are a part of structure in piece, including crystal oscillating circuit 41, switching circuit 42, I/O are delayed
Circuit 43 and multiplex interface pin 44 are rushed, in Fig. 4-1, under being currently at external crystal oscillator pattern, now multiplex interface pin
(one end that interface pin is used to be connected with chip exterior is external connection terminal to 44 external connection terminal, for electric with chip internal
One end of road connection is then internal connection end) it is connected with external passive crystal oscillator 46, multiplex interface is controlled by switching circuit 42 and is drawn
The inside connection end of foot 44 is connected with crystal oscillator oscillating circuit, is so achieved that the effectively connection with external passive crystal oscillator 46, meets
Demand of the chip to external clock；
Referring to shown in Fig. 4-2, under being currently at application model, the now external connection terminal of multiplex interface pin 44 and application
Interface 47 connects, and the inside connection end of the control multiplex interface of switching circuit 42 pin 44 is connected with I/O buffer circuits 43, so real
Show multiplex interface pin 44 to switch to I/O buffer circuits 43 from crystal oscillator oscillating circuit (also may act as generic interface makes
With), corresponding application of function is realized, rather than idle state is just constantly in when being connected with external passive crystal oscillator 46,
The utilization rate of interface resource, more conducively chip essence littleization development can be lifted.
The crystal oscillator that the chip that the present embodiment is provided is included can support the access of external passive crystal oscillator 46, and energy
When external passive crystal oscillator 46 need not be accessed the interface pin is connected to realize corresponding function with functional circuit, it is to avoid core
The waste of piece interface resource, lifts the utilization rate of interface resource, beneficial to the further essence littleization development of chip.
Embodiment three：
Crystal oscillator control method is present embodiments provided, the crystal oscillator can be arranged in chip, especially may be used
To be arranged in fpga chip.The crystal oscillator is set including crystal oscillating circuit, application function circuit, multiplex interface pin
And switching circuit, the control process of the crystal oscillator is included：
Under external crystal oscillator pattern, the external connection terminal of multiplex interface pin is connected with external passive crystal oscillator, by cutting
Change the circuit control multiplex interface pin inner portions connection end to be connected with the crystal oscillator oscillating circuit, to realize external passive crystal oscillator
Entrance；
In the application mode, the external connection terminal of multiplex interface pin is connected with application interface, by switching circuit control
The inside connection end of multiplex interface pin processed is connected with application function circuit, to realize corresponding function application.
It should be appreciated that the crystal oscillating circuit in the present embodiment can specifically adopt the crystal of existing various structures to shake
Swing circuit.Switching circuit in the present embodiment is specifically as follows the switching control electricity of the arbitrary structures for realizing circuit connection switching
Road.Application function circuit in the present embodiment specifically can be according to the factor choosing such as current application scenarios, the function of needing realization
Select, for example it includes but is not limited to I/O buffering (I/O buffer) circuits, wherein I/O is input/output interface.The present embodiment
The logarithm of middle multiplex interface pin then can confirm according to the number of the external passive crystal oscillator for being currently needed for connecting, for example, can set
Put a pair of interface pin one external passive crystal oscillators of correspondence.
In order to be better understood from the present invention, shown with reference to a kind of concrete structure of the chip comprising crystal oscillator
Example explanation.Shown in Figure 5, wherein 5 is a part of structure in piece, 51 is a kind of example implementation side of crystal oscillating circuit
Formula, 52 is a kind of sample implementation of switching circuit, and 53 is a kind of sample implementation of I/O buffer circuits, and 54 is chip
Internal circuit.It can be seen from Fig. 5：
Switching circuit 52 physically can be isolated crystal oscillating circuit 51 and I/O buffer circuits 53, be realization
Interface pin multiplexing provides precondition.
When external passive crystal oscillator (namely under external crystal oscillator pattern), configuration switching circuit 52 (configuration signal is not drawn into)
Its internal two mux is set to gate " 0 " path (now closing I/O buffer circuits 53), while enable crystal oscillating circuit 51 (making
Energy control signal is not drawn into), and normal starting condition for oscillation is provided for crystal oscillator, such as access suitable resistance, electric capacity, crystal oscillation electricity
The output clock on road 51 is given internal circuit 54 and is used.
When not connecing without source crystal (namely in the application mode), configuration switching circuit 52 (configuration signal is not drawn into) makes it
Internal two mux gate " 1 " path (now closing crystal oscillating circuit 51), while enabling I/O buffer circuits 53, multiplexing connects
Mouth pin is connected through I/O buffer circuits 53 with internal circuit 54；Realize corresponding application of function.
It can be seen that, the crystal oscillator that the present embodiment is provided supports that multiplex interface pin is (namely external in external crystal oscillator pattern
Crystal oscillator interface modes) switch and application model (namely generic interface pattern) between, the compatibility to generic interface pattern is realized,
The idle and caused wasting of resources of interface pin when external passive crystal oscillator need not be accessed is avoided, interface resource can be lifted
The further essence littleization development of utilization rate, more conducively chip.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this
It is bright to be embodied as being confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the protection of the present invention
Scope.
Claims (10)
1. a kind of crystal oscillator, it is characterised in that including crystal oscillating circuit, switching circuit, application function circuit and multiple
Use interface pin；
Under external crystal oscillator pattern, the external connection terminal of the multiplex interface pin is connected with external passive crystal oscillator, the switching
Circuit controls the multiplex interface pin inner portions connection end and is connected with the crystal oscillator oscillating circuit；
In the application mode, the external connection terminal of the multiplex interface pin is connected with application interface, the switching circuit control
The inside connection end of the multiplex interface pin is connected with the application function circuit.
2. crystal oscillator as claimed in claim 1, it is characterised in that the switching circuit is multidiameter option switch circuit；
The multiplex interface pin is connected with the outfan of the multidiameter option switch circuit, the crystal oscillating circuit and described
Application function circuit is connected respectively with an input in the multi-path choice input of the multidiameter option switch.
3. crystal oscillator as claimed in claim 2, it is characterised in that including two multiplex interface pins.
4. crystal oscillator as claimed in claim 3, it is characterised in that the multidiameter option switch circuit includes two two-way
Selecting switch, described two multiplex interface pins are connected respectively with the outfan of the two-way selecting switch；The crystal oscillation
Circuit and the application function circuit select input to be connected with the two-way of described two two-way selecting switch respectively.
5. the crystal oscillator oscillator as described in any one of claim 1-4, it is characterised in that the application function circuit includes I/O
Buffer circuit；
Under the application model, the inside connection end that the switching circuit controls the multiplex interface pin is slow with the I/O
Rush circuit connection.
6. a kind of chip, it is characterised in that including internal circuit and the crystal oscillator as described in any one of claim 1-5,
The crystal oscillator is connected with the internal circuit.
7. a kind of crystal oscillator control method, it is characterised in that the crystal oscillator includes crystal oscillating circuit, applies work(
Energy circuit, multiplex interface pin and switching circuit, methods described includes：
Under external crystal oscillator pattern, the external connection terminal of the multiplex interface pin is connected with external passive crystal oscillator, by institute
State the switching circuit control multiplex interface pin inner portions connection end to be connected with the crystal oscillator oscillating circuit；
In the application mode, the external connection terminal of the multiplex interface pin is connected with application interface, by the switching electricity
Road controls the inside connection end of the multiplex interface pin and is connected with the application function circuit.
8. crystal oscillator control method as claimed in claim 7, it is characterised in that the switching circuit is opened for multi-path choice
Powered-down road；
The multiplex interface pin is connected with the outfan of the multidiameter option switch circuit, and by the crystal oscillating circuit
It is connected with an input in application function circuit multi-path choice input respectively with the multidiameter option switch.
9. crystal oscillator control method as claimed in claim 8, it is characterised in that including two multiplex interface pins；
The multidiameter option switch circuit includes two two-way selecting switch, and described two multiplex interface pins are respectively with described two
The outfan connection of road selecting switch；The crystal oscillating circuit and the application function circuit are selected respectively with described two two-way
The two-way for selecting switch selects input connection.
10. the crystal oscillator oscillator control method as described in any one of claim 7-9, it is characterised in that the application function electricity
Road includes I/O buffer circuits；
Under the application model, the inside connection end of the multiplex interface pin and the I/ are controlled by the switching circuit
O buffer circuits connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610920468.1A CN106571805B (en) | 2016-10-21 | 2016-10-21 | Crystal oscillator, chip and crystal oscillator control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610920468.1A CN106571805B (en) | 2016-10-21 | 2016-10-21 | Crystal oscillator, chip and crystal oscillator control method |
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| Publication Number | Publication Date |
|---|---|
| CN106571805A true CN106571805A (en) | 2017-04-19 |
| CN106571805B CN106571805B (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610920468.1A Active CN106571805B (en) | 2016-10-21 | 2016-10-21 | Crystal oscillator, chip and crystal oscillator control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108897181A (en) * | 2018-06-29 | 2018-11-27 | 昆明理工大学 | A kind of micronic dust powder camera aperture |
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| US7403039B1 (en) * | 2007-02-02 | 2008-07-22 | International Business Machines Corporation | Flexible multimode logic element for use in a configurable mixed-logic signal distribution path |
| CN101232471A (en) * | 2008-02-26 | 2008-07-30 | 上海士康射频技术有限公司 | Base band signal processing chip |
| CN101452433A (en) * | 2007-11-30 | 2009-06-10 | 中兴通讯股份有限公司 | Diplex interface recognition device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7403039B1 (en) * | 2007-02-02 | 2008-07-22 | International Business Machines Corporation | Flexible multimode logic element for use in a configurable mixed-logic signal distribution path |
| CN101452433A (en) * | 2007-11-30 | 2009-06-10 | 中兴通讯股份有限公司 | Diplex interface recognition device and method |
| CN101232471A (en) * | 2008-02-26 | 2008-07-30 | 上海士康射频技术有限公司 | Base band signal processing chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108897181A (en) * | 2018-06-29 | 2018-11-27 | 昆明理工大学 | A kind of micronic dust powder camera aperture |
| CN108897181B (en) * | 2018-06-29 | 2021-05-14 | 昆明理工大学 | Light ring of dust powder camera |
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| Publication number | Publication date |
|---|---|
| CN106571805B (en) | 2020-08-11 |
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