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Crystal oscillator, chip and crystal oscillator control method

A crystal oscillator, crystal oscillation technology, applied in the direction of logic circuit interface device, logic circuit connection/interface layout, etc., can solve the problem of waste of interface resources, can only be idle, etc., to improve the utilization rate, realize multiplexing, facilitate precision The effect of miniaturization

Active Publication Date: 2020-08-11
SHENZHEN PANGO MICROSYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main technical problem to be solved by the present invention is to provide a crystal oscillator, a chip and a crystal oscillator control method to solve the problem that the existing interface pins used to connect to external crystal oscillators can only be idle when not connected to external crystal oscillators, resulting in the loss of interface resources. Waste, limiting the further miniaturization of chips

Method used

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  • Crystal oscillator, chip and crystal oscillator control method
  • Crystal oscillator, chip and crystal oscillator control method
  • Crystal oscillator, chip and crystal oscillator control method

Examples

Experimental program
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Embodiment 1

[0033] This embodiment provides a crystal oscillator, see figure 2 As shown, it includes a crystal oscillation circuit 21, a switching circuit 22, an application function circuit 23, and a multiplexing interface pin 24; it should be understood that the crystal oscillation circuit 21 in this embodiment can specifically adopt crystals of various existing structures. Oscillation circuit 21. The switching circuit 22 in this embodiment may specifically be a switching control circuit of any structure that realizes circuit connection switching. The application function circuit 23 in this embodiment can be specifically selected according to factors such as the current application scenario and the functions to be realized, for example, it includes but is not limited to an I / O buffer (I / O buffer) circuit, wherein I / O is an input / Output Interface. In this embodiment, the number of pairs of multiplexed interface pins 24 can be confirmed according to the number of external passive crys...

Embodiment 2

[0042] This embodiment provides a kind of chip, and this chip can be any chip that comprises crystal oscillator, especially can be FPGA chip, see image 3 As shown, the chip includes an internal circuit and the crystal oscillator shown in Embodiment 1, wherein the crystal oscillator is connected to the internal circuit 25 . The specific connection mode can be flexibly set according to the specific structure of the crystal oscillator and the internal circuit 25 . In order to better understand the present invention, the following takes the application function circuit as the I / O buffer circuit 43 as an example to further illustrate the present invention.

[0043] see Pic 4-1 As shown, 4 is a part of the structure in the chip, including crystal oscillator circuit 41, switching circuit 42, I / O buffer circuit 43 and multiplexing interface pin 44, in Pic 4-1 , currently in the external crystal oscillator mode, at this time the external connection end of the multiplexed interface...

Embodiment 3

[0047] This embodiment provides a method for controlling a crystal oscillator. The crystal oscillator can be set in a chip, especially in an FPGA chip. Setting the crystal oscillator includes a crystal oscillator circuit, an application function circuit, multiplexed interface pins, and a switching circuit. The control process of the crystal oscillator includes:

[0048] In the external crystal oscillator mode, the external connection end of the multiplexing interface pin is connected to the external passive crystal oscillator, and the internal connection end of the multiplexing interface pin is controlled by a switching circuit to be connected to the crystal oscillator circuit, so as to realize the external passive crystal oscillator. The entry of the crystal oscillator;

[0049] In the application mode, the external connection end of the multiplexing interface pin is connected to the application interface, and the internal connection end of the multiplexing interface pin is c...

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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 [0001] The invention relates to the field of integrated circuits, in particular to a crystal oscillator, a chip and a method for controlling the crystal oscillator. Background technique [0002] As a low-cost and high-precision clock reference, crystal oscillators are widely used in various handheld devices and portable electronic products. In order to support the external passive crystal oscillator (External Crystal Oscillator, XTAL), the chip containing the crystal oscillator circuit needs to provide two dedicated input interfaces (that is, two pins, hereinafter referred to as interface pins) to the external passive crystal oscillator. Schematic see figure 1 As shown, the two interface pins 11 are specially used to connect the external passive crystal oscillator 12 to meet the requirements of the chip on the clock source. But at present, the interface pin 11 used to connect the external passive crystal oscillator in the chip is specially set to only be us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0175
CPCH03K19/017509
Inventor 刘炽峰
Owner SHENZHEN PANGO MICROSYST CO LTD