CN113835466B - Control device and method for realizing server spread spectrum - Google Patents
Control device and method for realizing server spread spectrum Download PDFInfo
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- CN113835466B CN113835466B CN202110963076.4A CN202110963076A CN113835466B CN 113835466 B CN113835466 B CN 113835466B CN 202110963076 A CN202110963076 A CN 202110963076A CN 113835466 B CN113835466 B CN 113835466B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/08—Clock generators with changeable or programmable clock frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a control device for realizing server spread spectrum, which comprises: the device comprises a programmable logic device, a plurality of switch modules, a plurality of first function selectors, a second function selector and a clock generator, wherein each channel of spread spectrum control output end of the programmable logic device is respectively in communication connection with the switch modules and the first function selectors and is used for adjusting output signals of the second function selectors; the invention further provides a control method for realizing the spread spectrum of the server, which is convenient for EMI test, effectively solves the problems of low spread spectrum control efficiency and poor continuity caused by the prior art, and effectively improves the efficiency and reliability of the spread spectrum control of the server.
Description
Technical Field
The present invention relates to the field of spread spectrum control, and in particular, to a control device and method for implementing server spread spectrum.
Background
As the frequency of electronic signals increases, the problem of EMI (Electromagnetic Interference ) becomes more and more serious. The main reason for generating the EMI is clock signals, and good clock design and layout not only ensure good performance and timing problems of the system, but also can reduce the EMI radiation interference problem to the maximum extent.
There are various EMI problems caused by reducing clock signals, such as shielding, filtering, isolation, ferrite beads, signal edge control, and adding power and GND (ground) layers in PCBs (Printed Circuit Board, printed circuit boards), which are not well suited for server product applications because of the limitations of cost, signal type, and impedance. Another method for reducing EMI is spread spectrum control, which modulates a signal by spreading spectrum, and spreads the signal energy over a wider frequency range, so as to effectively suppress the EMI problem of the system.
The existing mode of reducing EMI through spread spectrum control uses a connector, then selects different voltages through the jumper cap to control the spread spectrum width of the clock generator chip, and through the mode of plugging the jumper cap, the efficiency is lower, especially in the EMI test of continuity, frequent plugging can lead to the fastness to be poor, bad contact is unfavorable for improving the efficiency and the reliability of spread spectrum control.
Disclosure of Invention
In order to solve the problems in the prior art, the invention innovatively provides a control device and a control method for realizing the spread spectrum of a server, which effectively solve the problems of low spread spectrum control efficiency and poor continuity caused by the prior art and effectively improve the efficiency and the reliability of the spread spectrum control of the server.
The first aspect of the present invention provides a control device for implementing server spread spectrum, including: the device comprises a programmable logic device, a plurality of switch modules, a plurality of first function selectors, a second function selector and a clock generator, wherein each channel of spread spectrum control output end of the programmable logic device is respectively in communication connection with the switch modules and the first function selectors and is used for adjusting output signals of the second function selectors; the clock generator is in communication connection with the second function selector and is used for realizing the spread spectrum control mode of the clock generator and the adjustment and switching among spread spectrum with different widths according to the output signal of the second function selector.
Optionally, the number of the switch modules and the number of the first function selectors are the same as the number of the spread spectrum control output terminals of the programmable logic device.
Further, the power input end of each switch module is connected with a power supply, and the other end of each switch module is correspondingly connected with the spread spectrum control output end of the programmable logic device.
Optionally, the selection control end of each first function selector is connected with the spread spectrum control output end of the programmable logic device, the first input end of each first function selector is connected with the power supply, the second input end of each first function selector is grounded, and the output end of each first function selector is connected with the first input end of the second function selector.
Optionally, the spread spectrum control mode includes a remote control mode and a jumper cap control mode, wherein the remote control mode is to control output signals of the second function selector through output ends of the first function selectors; the jumper cap control mode is to control the output signal of the second function selector through the connection mode of the jumper cap.
Further, one path of the selection control end of the second function selector is connected with a power supply, and the other path of the selection control end of the second function selector is connected with the power supply input end of each switch module; the first input end of the second function selector is connected with the output end of each first function selector; one path of the second input end of the second function selector is connected with a second connecting terminal of the connector, the other path of the second input end of the second function selector is grounded, and other connecting terminals except the second connecting terminal in the connector are connected with a power supply; the output end of the second function selector is connected with the input end of the clock generator.
Further, the adjusting control of the output signal of the second function selector is realized through the connection of the jumper cap and the connecting terminal in the connector.
Optionally, the output signal of the second function selector is high or low in level, and when the output signal of the second function selector is low in level, the clock generator turns off spread spectrum control; when the output signal of the second function selector is at high level with different values, the clock generator performs adjustment and switching between spreading frequencies with different widths according to the different values of the high level.
The second aspect of the present invention provides a method for controlling a spread spectrum of a server, which is implemented based on the control device for implementing a spread spectrum of a server according to the first aspect of the present invention, and includes:
the programmable logic device transmits a corresponding spread spectrum control signal through the switch module and the first function selector according to the target spread spectrum control mode and the target width spread spectrum;
the second function selector selects a corresponding target spread spectrum control mode through a spread spectrum control signal sent by the programmable logic device and outputs a corresponding level according to the spread spectrum control signal;
the signal generator achieves the target width spread spectrum by the high and low of the output level of the second function selector.
Optionally, the target spread spectrum control mode includes a remote control mode and a jumper cap control mode, wherein the remote control mode is to control output signals of the second function selector through output ends of the first function selectors; the jumper cap control mode is to control the output signal of the second function selector through the connection mode of the jumper cap; when the output signal of the second function selector is at a low level, the clock generator turns off spread spectrum control; when the output signal of the second function selector is at high level with different values, the clock generator performs adjustment and switching between spreading frequencies with different widths according to the different values of the high level.
The technical scheme adopted by the invention comprises the following technical effects:
1. the invention can realize remote control of spread spectrum, does not need to frequently and manually plug jumper wire caps, is very convenient for EMI test, effectively solves the problems of low spread spectrum control efficiency and poor continuity caused by the prior art, and effectively improves the efficiency and reliability of server spread spectrum control.
2. According to the technical scheme, the number of the switch modules and the number of the first function selectors are correspondingly the same as the number of the spread spectrum control output ends of the programmable logic device, and the clock generator is used for adjusting and switching between spread spectrum with different widths according to different high-level values, so that the adjustment and switching of multiple spread spectrum widths of the server can be realized, and the comprehensiveness of spread spectrum control is improved.
3. According to the technical scheme, the spread spectrum control mode comprises a remote control mode and a jumper cap control mode, so that the adjustment and the switching of the two spread spectrum control modes of the server can be realized, the spread spectrum control failure caused by a single mode failure is avoided, and the flexibility and the reliability of the spread spectrum control are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
For a clearer description of embodiments of the invention or of the solutions of the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or of the prior art, and it will be obvious to those skilled in the art that other drawings can be obtained from these without inventive labour.
FIG. 1 is a schematic view of an apparatus according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a second method in the embodiment of the invention.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
Example 1
As shown in fig. 1, the present invention provides a control device for implementing server spread spectrum, and the present invention is exemplified by a switch module and a number of first function selectors which are all 2, and includes: a programmable logic device U5, a switch module Q1, a switch module Q2, a first function selector U3, a first function selector U4, a second function selector U2 and a clock generator U1; one path of spread spectrum control output end (GPIO_0) of the programmable logic device U5 is respectively in communication connection with the switch module Q1 and the first function selector U3, the other path of spread spectrum control output end (GPIO_1) of the programmable logic device U5 is respectively in communication connection with the switch module Q2 and the first function selector U4, and the output signals of the second function selector U2 are regulated through the output signals of the first function selector U3 and the second function selector U4; the clock generator U1 is in communication connection with the second function selector U2, and is used for realizing the spread spectrum control mode of the clock generator U1 and the adjustment and switching between spread spectrum with different widths according to the output signal of the second function selector U2.
The number of the switch modules and the number of the first function selectors are correspondingly the same as the number of the spread spectrum control output ends of the programmable logic device.
The power input end of each switch module is connected with a power supply, and the other end of each switch module is correspondingly connected with the spread spectrum control output end of the programmable logic device.
Specifically, as shown in fig. 1, the power input end of the switch module Q1 is connected with the power P3V3 through the pull-up resistor R1, and the other end of the switch module Q1 is connected with one path of spread spectrum control output end (gpio_0) of the programmable logic device U5; the power input end of the switch module Q2 is connected with the power P3V3 through the pull-up resistor R1, and the other end of the switch module Q2 is connected with the other path of spread spectrum control output end (GPIO_1) of the programmable logic device U5.
Further, the switch module Q1 and the switch module Q2 may be implemented by MOS transistors, for example, N-type MOS transistors, where a gate of the MOS transistor Q1 is connected to a path of spread spectrum control output terminal (gpio_0) of the programmable logic device U5, and a drain of the MOS transistor Q1 is connected to the power supply P3V3 through a pull-up resistor R1, and a source of the MOS transistor Q1 is grounded; the grid electrode of the MOS tube Q2 is connected with the other path of spread spectrum control output end (GPIO_1) of the programmable logic device U5, the drain electrode of the MOS tube Q2 is connected with a power supply P3V3 through a pull-up resistor R1, and the source electrode of the MOS tube Q2 is grounded. The resistance of the pull-up resistor R1 may be 10kΩ, or may be adjusted according to practical situations, which is not limited in the present invention.
The selection control end of each first function selector is connected with the spread spectrum control output end of the programmable logic device, the first input end of each first function selector is connected with a power supply, the second input end of each first function selector is grounded, and the output end of each first function selector is connected with the first input end of the second function selector.
Specifically, as shown in fig. 1, a selection control end (S end) of the first function selector U3 is connected to a path of spread spectrum control output end (gpio_0) of the programmable logic device U5 through a resistor R2, a first input end (B0) of the first function selector U3 is connected to the power supply P3V3 through a pull-up resistor R3, a second input end (B1) of the first function selector U3 is grounded through a resistor R4, and an output end of the first function selector U3 is connected to a first input end (B0) of the second function selector U2; the selection control end (S end) of the second function selector U4 is connected with the other channel spread spectrum control output end (GPIO_1) of the programmable logic device U5 through a resistor R5, the first input end (B0) of the second function selector U4 is connected with a power supply P3V3 through a pull-up resistor R6, the second input end (B1) of the second function selector U4 is grounded through a resistor R7, and the output end of the second function selector U4 is connected with the first input end (B0) of the second function selector U2; the resistance values of the resistor R2 and the resistor R5 may be 1kΩ, the resistance value of the resistor R3 may be 100kΩ, the resistance values of the resistor R6 may be 1kΩ, the resistance values of the resistor R4 and the resistor R7 may be 100kΩ, that is, the resistance value of the resistor R3 is greater than the resistance value of the resistor R6, the resistance value of the resistor R4 is the same as the resistance value of the resistor R7, and the resistor R7 may be adjusted according to the actual situation.
One path of a selection control end (S end) of the second function selector U2 is connected with a power supply P3V3 through a pull-up resistor R1, and the other path of the selection control end is connected with power supply input ends of the switch module Q1 and the switch module Q2; the first input end (B0) of the second function selector U2 is connected with the first function selector U3 and the output end of the first function selector U4; one path of the second input end (B1) of the second function selector U2 is connected with a second connecting terminal of the connector J1, the other path is grounded, a first connecting terminal in the connector J1 is connected with a power supply P3V3, and a third connecting terminal in the connector J1 is connected with the power supply P3V3 through a resistor R9; the output of the second function selector U2 is connected to the input of the clock generator U1. The resistance value of the resistor R9 may be 10kΩ, or may be adjusted according to practical situations, which is not limited in this disclosure.
The spread spectrum control mode comprises a remote control mode and a jumper cap control mode, wherein the remote control mode is used for controlling output signals of the second function selector U2 through the output ends of the first function selector U3 and the first function selector U4; the jumper cap control mode is to control the output signal of the second function selector U2 through the connection mode of the jumper cap. And the jumper cap is connected with a connecting terminal in the connector to realize the adjustment control of the output signal of the second function selector.
Specifically, the output signal of the second function selector U2 is high or low, and when the output signal of the second function selector U2 is low, the clock generator U1 turns off the spread spectrum control; when the output signal of the second function selector U2 is at a high level with different values, the clock generator U1 performs adjustment and switching between spreading frequencies with different widths according to the different values of the high level. For example, when the level of the output signal of the second function selector U2 is a high level (for example, more than 1.65V and less than 3.3V) whose voltage value is high, the clock generator U1 executes-0.5% ssc (Spread Spectrum Clocking, spread spectrum clock); when the level of the output signal of the second function selector U2 is a high level with a low voltage value, the clock generator U1 executes-0.3% ssc.
The programmable logic device U5 may be implemented by using a CPLD (Complex Programmable logic device, a complex programmable logic device), and the first function selector U3, the first function selector U4, and the second function selector U2 may be of a model number 74LVC1G3157, or may be adjusted according to practical situations, which is not limited in this disclosure.
Specifically, the remote control mode and the jumper cap control mode are as follows: when the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 0 (low level) and the output of the spread spectrum control output terminal (gpio_1) is 0 (low level), the switch module Q1 and the switch module Q2 are not turned on, the selection control terminal (S terminal) of the second function selector U2 will be pulled up, and the output signal a of the second function selector U2 will be determined by the second input terminal B1, so that the remote control mode is turned off and is switched to the conventional jumper cap control mode. In particular, when the jumper cap shorts 1-2 (i.e., the first connection terminal and the second connection terminal) of the connector J1, the voltage of the resistor R8 is pulled high, the second function selector U2 outputs a high level with a higher value (e.g., greater than 1.65V and less than 3.3V), and the clock generator U1 performs a spread spectrum width of-0.5% SSC; when the jumper cap shorts 2-3 of the connector J1 (namely the second connecting terminal and the third connecting terminal), the resistor R8 and the resistor R9 are shorted together, the resistance values of the resistor R8 and the resistor R9 are the same and are both 10K, the voltage on the resistor R8 is 1.65V, the second function selector U2 outputs a voltage value with medium value, and the spread spectrum width executed by the clock generator U1 is-0.3% SSC; when the jumper cap is not connected, R8 is grounded due to pull-down, the second function selector U2 outputs a low signal, and the clock generator U1 turns off the spread spectrum SSC.
When the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 0 (low level) and the output of the spread spectrum control output terminal (gpio_1) is 1 (high level), the switch module Q1 is turned off, the switch module Q2 is turned on, the selection control terminal (S terminal) of the second function selector U2 will be pulled down, the output signal a of the second function selector U2 will be determined by the first input terminal B0, and the method of remote control of spread spectrum is turned on. In particular, the selection control terminal (S terminal) of the first function selector U3 is pulled low, and the first input terminal B0 is selected for outputting, the selection control terminal (S terminal) of the first function selector U4 is pulled high, and the second input terminal B1 is selected for outputting, because the resistor R3 and the resistor R7 are shorted together, and the resistor values are the same, the first function selector U3 and the first function selector U4 both output a medium high level (e.g. 1.65V), the second function selector U2 correspondingly outputs a medium high level, and the clock generator U1 performs a width spread spectrum of-0.3% ssc.
When the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 1 (high level) and the output of the spread spectrum control output terminal (gpio_1) is 0 (low level), the switch module Q1 is turned on, the switch module Q2 is turned off, the selection control terminal (S terminal) of the second function selector U2 will be pulled down, the output signal a of the second function selector U2 will be determined by the first input terminal B0, and the method of remote control of spread spectrum is turned on. In particular, the selection control terminal (S terminal) of the first function selector U3 is pulled high, and the second input terminal B1 is selected for outputting, the selection control terminal (S terminal) of the first function selector U4 is pulled low, and the first input terminal B0 is selected for outputting, because the resistor R4 and the resistor R6 are shorted together, and the resistance value of the resistor R4 is higher than that of the resistor R6, the first function selector U3 and the first function selector U4 both output high levels with higher values (for example, greater than 1.65V), the second function selector U2 correspondingly outputs a high level with higher values (for example, greater than 1.65V and less than 3.3V), and the width spread spectrum of the clock generator U1 is performed by-0.5% ssc.
When the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 1 (high level) and the output of the spread spectrum control output terminal (gpio_1) is 1 (high level), the switch module Q1 is turned on, the switch module Q2 is turned on, the selection control terminal (S terminal) of the second function selector U2 will be pulled down, the output signal a of the selection control terminal U2 of the second function selector U2 will be determined by the first input terminal B0, and the method of remotely controlling the spread spectrum is turned on. In particular, the selection control terminal (S terminal) of the first function selector U3 is pulled high, and the second input terminal B1 is selected for outputting, the selection control terminal (S terminal) of the first function selector U4 is pulled high, and the second input terminal B1 is selected for outputting, since the resistor R4 and the resistor R7 are shorted together, and the resistor R4 and the resistor R7 are grounded, the first function selector U3 and the first function selector U4 both output a low level, the second function selector U2 correspondingly outputs a low level, and the clock generator U1 shuts down the spread spectrum SSC.
It should be noted that, the embodiment of the present invention is described by taking two paths including two switch modules, two first function selectors and a spread spectrum control output end as an example, but the present invention is not limited to two paths, and may be two paths or more than two paths, and the two paths of implementation principle are the same, and only adding corresponding devices and modifying corresponding connections are required.
The invention can realize remote control of spread spectrum, does not need to frequently and manually plug jumper wire caps, is very convenient for EMI test, effectively solves the problems of low spread spectrum control efficiency and poor continuity caused by the prior art, and effectively improves the efficiency and reliability of server spread spectrum control.
According to the technical scheme, the number of the switch modules and the number of the first function selectors are correspondingly the same as the number of the spread spectrum control output ends of the programmable logic device, and the clock generator is used for adjusting and switching between spread spectrum with different widths according to different high-level values, so that the adjustment and switching of multiple spread spectrum widths of the server can be realized, and the comprehensiveness of spread spectrum control is improved.
According to the technical scheme, the spread spectrum control mode comprises a remote control mode and a jumper cap control mode, so that the adjustment and the switching of the two spread spectrum control modes of the server can be realized, the spread spectrum control failure caused by a single mode failure is avoided, and the flexibility and the reliability of the spread spectrum control are improved.
Example two
As shown in fig. 2, the technical solution of the present invention further provides a method for implementing server spread spectrum, which is implemented based on a control device for implementing server spread spectrum in the first embodiment, and includes:
s1, a programmable logic device sends a corresponding spread spectrum control signal through a switch module and a first function selector according to a target spread spectrum control mode and a target width spread spectrum;
s2, the second function selector selects a corresponding target spread spectrum control mode through a spread spectrum control signal sent by the programmable logic device, and outputs a corresponding level according to the spread spectrum control signal;
s3, the signal generator achieves target width spread spectrum through the output level of the second function selector.
In the steps S1-S3, the target spread spectrum control mode comprises a remote control mode and a jumper cap control mode, wherein the remote control mode is to control output signals of a second function selector through output ends of a plurality of first function selectors; the jumper cap control mode is to control the output signal of the second function selector through the connection mode of the jumper cap; when the output signal of the second function selector is at a low level, the clock generator turns off spread spectrum control; when the output signal of the second function selector is at high level with different values, the clock generator performs adjustment and switching between spreading frequencies with different widths according to the different values of the high level.
Specifically, the output signal of the second function selector U2 is high or low, and when the output signal of the second function selector U2 is low, the clock generator U1 turns off the spread spectrum control; when the output signal of the second function selector U2 is at a high level with different values, the clock generator U1 performs adjustment and switching between spreading frequencies with different widths according to the different values of the high level. For example, when the level of the output signal of the second function selector U2 is a high level (for example, more than 1.65V and less than 3.3V) whose voltage value is high, the clock generator U1 executes-0.5% ssc (Spread Spectrum Clocking, spread spectrum clock); when the level of the output signal of the second function selector U2 is a high level with a low voltage value, the clock generator U1 executes-0.3% ssc.
The programmable logic device U5 may be implemented by using a CPLD (Complex Programmable logic device, a complex programmable logic device), and the first function selector U3, the first function selector U4, and the second function selector U2 may be of a model number 74LVC1G3157, or may be adjusted according to practical situations, which is not limited in this disclosure.
Specifically, the remote control mode and the jumper cap control mode are as follows: when the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 0 and the output of the spread spectrum control output terminal (gpio_1) is 0, neither the switch module Q1 nor the switch module Q2 is turned on, the selection control terminal (S terminal) of the second function selector U2 will be pulled high, and the output signal a of the second function selector U2 will be determined by the second input terminal B1, so that the remote control mode is turned off and the conventional jumper cap control mode is switched. In particular, when the jumper cap shorts 1-2 (i.e., the first connection terminal and the second connection terminal) of the connector J1, the voltage of the resistor R8 is pulled high, the second function selector U2 outputs a high level with a higher value (e.g., greater than 1.65V and less than 3.3V), and the clock generator U1 performs a spread spectrum width of-0.5% SSC; when the jumper cap shorts 2-3 of the connector J1 (namely the second connecting terminal and the third connecting terminal), the resistor R8 and the resistor R9 are shorted together, the resistance values of the resistor R8 and the resistor R9 are the same and are both 10K, the voltage on the resistor R8 is 1.65V, the second function selector U2 outputs a voltage value with medium value, and the spread spectrum width executed by the clock generator U1 is-0.3% SSC; when the jumper cap is not connected, R8 is grounded due to pull-down, the second function selector U2 outputs a low signal, and the clock generator U1 turns off the spread spectrum SSC.
When the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 0 and the output of the spread spectrum control output terminal (gpio_1) is 1, the switch module Q1 is turned off, the switch module Q2 is turned on, the selection control terminal (S terminal) of the second function selector U2 will be pulled down, the output signal a of the second function selector U2 will be determined by the first input terminal B0, and the method of remote control of spread spectrum is turned on. In particular, the selection control terminal (S terminal) of the first function selector U3 is pulled low, and the first input terminal B0 is selected for outputting, the selection control terminal (S terminal) of the first function selector U4 is pulled high, and the second input terminal B1 is selected for outputting, because the resistor R3 and the resistor R7 are shorted together, and the resistor values are the same, the first function selector U3 and the first function selector U4 both output a medium high level (e.g. 1.65V), the second function selector U2 correspondingly outputs a medium high level, and the clock generator U1 performs a width spread spectrum of-0.3% ssc.
When the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 1 and the output of the spread spectrum control output terminal (gpio_1) is 0, the switch module Q1 is turned on, the switch module Q2 is turned off, the selection control terminal (S terminal) of the second function selector U2 is pulled down, the output signal a of the second function selector U2 is determined by the first input terminal B0, and the method of remote control of spread spectrum is turned on. In particular, the selection control terminal (S terminal) of the first function selector U3 is pulled high, and the second input terminal B1 is selected for outputting, the selection control terminal (S terminal) of the first function selector U4 is pulled low, and the first input terminal B0 is selected for outputting, because the resistor R4 and the resistor R6 are shorted together, and the resistance value of the resistor R4 is higher than that of the resistor R6, the first function selector U3 and the first function selector U4 both output high levels with higher values (for example, greater than 1.65V), the second function selector U2 correspondingly outputs a high level with higher values (for example, greater than 1.65V and less than 3.3V), and the width spread spectrum of the clock generator U1 is performed by-0.5% ssc.
When the output of the spread spectrum control output terminal (gpio_0) of the programmable logic device U5 is 1 and the output of the spread spectrum control output terminal (gpio_1) is 1, the switch module Q1 is turned on, the switch module Q2 is turned on, the selection control terminal (S terminal) of the second function selector U2 will be pulled down, the output signal a of the selection control terminal U2 of the second function selector U2 will be determined by the first input terminal B0, and the method of remote control of spread spectrum is turned on. In particular, the selection control terminal (S terminal) of the first function selector U3 is pulled high, and the second input terminal B1 is selected for outputting, the selection control terminal (S terminal) of the first function selector U4 is pulled high, and the second input terminal B1 is selected for outputting, since the resistor R4 and the resistor R7 are shorted together, and the resistor R4 and the resistor R7 are grounded, the first function selector U3 and the first function selector U4 both output a low level, the second function selector U2 correspondingly outputs a low level, and the clock generator U1 shuts down the spread spectrum SSC.
In summary, the programmable logic device sends the corresponding spread spectrum control signal through the switch module and the first function selector according to the target spread spectrum control mode and the target width spread spectrum; for example, if the target spread spectrum control mode is a remote control mode and the target width spread spectrum is-0.5% ssc, the gpio_0 signal is set to 1 (i.e., high level) and the gpio_1 signal is set to 0 (i.e., low level); if the target spread spectrum control mode is a remote control mode and the target width spread spectrum is-0.3% SSC, setting the GPIO_0 signal to 0 (i.e. low level) and the GPIO_1 signal to 0 (i.e. high level); if the target spread spectrum control mode is a remote control mode and SSC is closed, setting the GPIO_0 signal to be 1 (i.e. high level) and the GPIO_1 signal to be 1 (i.e. high level); if the target spread spectrum control mode is the jumper cap control mode, the GPIO_0 signal is set to 0 (i.e. low level), and the GPIO_1 signal is set to 1 (i.e. low level).
The second function selector U2 adjusts output according to the gpio_0 signal gpio_1 signal of the programmable logic device U5 or the connection mode of the jumper cap, specifically, if the gpio_0 signal of the programmable logic device U5 is 0 (low level) and the gpio_1 signal is 1 (high level), the level output by the second function selector U2 is a high level with a medium value (for example, 1.65V); if the gpio_0 signal of the programmable logic device U5 is 1 (high level) and the gpio_1 signal is 0 (low level), the level output by the second function selector U2 is a high level with a higher value (for example, greater than 1.65V and less than 3.3V); if the gpio_0 signal of the programmable logic device U5 is 1 (high level) and the gpio_1 signal is 1 (high level), the level output by the second function selector U2 is low level; if the gpio_0 signal of the programmable logic device U5 is 0 (low level) and the gpio_1 signal is 0 (low level), the level of the output of the second function selector U2 will be determined according to the connection mode of the jumper cap, specifically, when the jumper cap shorts 1-2 (i.e. the first connection terminal and the second connection terminal) of the connector J1, the second function selector U2 outputs a high level with a higher value (for example, greater than 1.65V and less than 3.3V); when the jumper cap shorts 2-3 of the connector J1 (namely the second connection terminal and the third connection terminal), the second function selector U2 outputs a medium voltage value (for example, 1.65V); when the jumper cap is not connected, the second function selector U2 outputs a low level signal.
The clock generator U1 can control spread frequencies with different widths according to the level output by the second function selector U2; specifically, when the level of the output of the second function selector U2 is a high level (for example, greater than 1.65V and less than 3.3V) whose value is high, the target width spread spectrum is performed to be-0.5% ssc; when the level of the output of the second function selector U2 is a moderately high level (e.g., 1.65V), the target width spread spectrum is performed at-0.3% ssc; when the level of the output of the second function selector U2 is low, the spread spectrum SSC is turned off.
The invention can realize remote control of spread spectrum, does not need to frequently and manually plug jumper wire caps, is very convenient for EMI test, effectively solves the problems of low spread spectrum control efficiency and poor continuity caused by the prior art, and effectively improves the efficiency and reliability of server spread spectrum control.
According to the technical scheme, the number of the switch modules and the number of the first function selectors are correspondingly the same as the number of the spread spectrum control output ends of the programmable logic device, and the clock generator is used for adjusting and switching between spread spectrum with different widths according to different high-level values, so that the adjustment and switching of multiple spread spectrum widths of the server can be realized, and the comprehensiveness of spread spectrum control is improved.
According to the technical scheme, the spread spectrum control mode comprises a remote control mode and a jumper cap control mode, so that the adjustment and the switching of the two spread spectrum control modes of the server can be realized, the spread spectrum control failure caused by a single mode failure is avoided, and the flexibility and the reliability of the spread spectrum control are improved.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. A control device for realizing server spread spectrum, comprising: the device comprises a programmable logic device, a plurality of switch modules, a plurality of first function selectors, a second function selector and a clock generator, wherein each channel of spread spectrum control output end of the programmable logic device is respectively in communication connection with the switch modules and the first function selectors and is used for adjusting output signals of the second function selectors; the clock generator is in communication connection with the second function selector and is used for realizing the spread spectrum control mode of the clock generator and the adjustment and switching among spread spectrum with different widths according to the output signal of the second function selector; the clock generator turns off spread spectrum control when the output signal of the second function selector is at a low level; when the output signal of the second function selector is at high level with different values, the clock generator performs adjustment and switching between spreading frequencies with different widths according to the different values of the high level.
2. The control device for implementing spread spectrum of a server according to claim 1, wherein the number of the switch modules and the number of the first function selectors are the same as the number of spread spectrum control output terminals of the programmable logic device.
3. The control device for realizing server spread spectrum according to claim 2, wherein the power input end of each switch module is connected with a power supply, and the other end of each switch module is correspondingly connected with the spread spectrum control output end of the programmable logic device.
4. The control device for implementing server spread spectrum according to claim 2, wherein the selection control terminal of each first function selector is connected to the spread spectrum control output terminal of the programmable logic device, the first input terminal of each first function selector is connected to the power supply, the second input terminal of each first function selector is grounded, and the output terminal of each first function selector is connected to the first input terminal of the second function selector.
5. The control device for realizing server spread spectrum according to claim 1, wherein the spread spectrum control mode comprises a remote control mode and a jumper cap control mode, wherein the remote control mode is to control output signals of the second function selectors through output ends of the plurality of first function selectors; the jumper cap control mode is to control the output signal of the second function selector through the connection mode of the jumper cap.
6. The control device for realizing server spread spectrum according to claim 5, wherein one path of the selection control end of the second function selector is connected with a power supply, and the other path is connected with the power supply input end of each switch module; the first input end of the second function selector is connected with the output end of each first function selector; one path of the second input end of the second function selector is connected with a second connecting terminal of the connector, the other path of the second input end of the second function selector is grounded, and other connecting terminals except the second connecting terminal in the connector are connected with a power supply; the output end of the second function selector is connected with the input end of the clock generator.
7. The control device for realizing server spread spectrum according to claim 6, wherein the second function selector output signal is regulated and controlled by connection of the jumper cap to the connection terminal in the connector.
8. A control method for realizing server spread spectrum, which is realized based on the control device for realizing server spread spectrum according to any one of claims 1-7, comprising:
the programmable logic device transmits a corresponding spread spectrum control signal through the switch module and the first function selector according to the target spread spectrum control mode and the target width spread spectrum;
the second function selector selects a corresponding target spread spectrum control mode through a spread spectrum control signal sent by the programmable logic device and outputs a corresponding level according to the spread spectrum control signal; the target spread spectrum control mode comprises a remote control mode and a jumper cap control mode, wherein the remote control mode is to control output signals of a second function selector through output ends of a plurality of first function selectors; the jumper cap control mode is to control the output signal of the second function selector through the connection mode of the jumper cap; when the output signal of the second function selector is at a low level, the clock generator turns off spread spectrum control; when the output signal of the second function selector is in high levels with different values, the clock generator carries out adjustment and switching among spreading frequencies with different widths according to the different values of the high levels;
the signal generator achieves the target width spread spectrum by the high and low of the output level of the second function selector.
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| CN111224658A (en) * | 2020-01-16 | 2020-06-02 | 电子科技大学 | Design method of parallel data-to-serial data conversion circuit |
| CN111900959A (en) * | 2020-08-28 | 2020-11-06 | 无锡英迪芯微电子科技股份有限公司 | Clock spread spectrum generating circuit based on linear feedback shift register |
| CN112615622A (en) * | 2020-12-26 | 2021-04-06 | 上海艾为电子技术股份有限公司 | Spread spectrum clock generator and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111224658A (en) * | 2020-01-16 | 2020-06-02 | 电子科技大学 | Design method of parallel data-to-serial data conversion circuit |
| CN111900959A (en) * | 2020-08-28 | 2020-11-06 | 无锡英迪芯微电子科技股份有限公司 | Clock spread spectrum generating circuit based on linear feedback shift register |
| CN112615622A (en) * | 2020-12-26 | 2021-04-06 | 上海艾为电子技术股份有限公司 | Spread spectrum clock generator and electronic equipment |
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