CN100373770C - Random frequency divider and realizing method thereof - Google Patents
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Abstract
The present invention relates to a random frequency divider and a realizing method thereof. The random frequency divider mainly comprises an and logic device D4, two registers RA, RB, an adder D1, a subtractor D2 and a selector D3. The realizing method comprises the five steps that input and output reference frequency parameters A, B stored in the registers RA, RB; the adder D1 adds the output frequency parameter B and an output signal AS of the selector D3 at the falling edge of an input frequency signal to output a signal S; the subtractor D2 subtracts the signal S and the input frequency parameter A; the difference value of S-A is output by a signal X; meanwhile, when S is greater than or equal to A, a signal Y is set as 1, otherwise the signal Y is set as 0; the selector D3 selects the signal X which is output to the signal AS when the signal Y is 1, otherwise the signal S is selected to be output to the signal AS; the and logic device D4 or a flip flop D4 makes corresponding action and outputs a frequency signal. The frequency divider can freely divide frequency, eliminate the error of frequency division and simplify system determining methods.
Description
Technical field
The invention belongs to the digital frequency division field, relate in particular to a kind of any frequency divider and its implementation.
Background technology
Frequency divider is a kind of device that can handle the high-frequency signal process of input output low frequency rate signal, present ubiquitous digital frequency divider, the higher-order of oscillation crystal that needs higher price, when needs change system frequency, essential redesign circuit, the cost design time, and the related elements of made can't use in the past, was not suitable for integrated.
Disclose a kind of divider circuit in the CN96120110 patent, this frequency divider changes output signal frequency by " byte code " described in its patent specification of change.Byte code conversion rule is as follows:
(required frequency/system frequency) * 2
The byte code number=byte code (formula 1)
This circuit improves traditional frequency divider, can also find that there is following shortcoming in this divider circuit but read this patent of invention specification:
1, only in (required frequency/system frequency) * 2
The byte code numberThe result can obtain frequency division output accurately under the situation of integer, otherwise, will there be the frequency division error;
2, in formula 1, exist " byte code number " to reach " byte code " two variablees to be determined, formula 1 is a linear equation in two unknowns, determines the system parameters inconvenience.
Summary of the invention
Main purpose of the present invention is to solve the problem that exists in the above-mentioned patent, proposes a kind of any frequency divider and its implementation that does not have the frequency division error, eliminates the frequency division error, and simplified system is determined method.
To achieve these goals, technical solution of the present invention is to propose a kind of any frequency divider, include and logic D4, and two register RA, RB, adder D1, subtracter D2, selector D3 is characterized in that:
Register RA, register RB, selector D3, adder D1, subtracter D2 and and logic D4 between get in touch for: output frequency B parameter that register RB deposits and the output signal AS of selector D3 are two addends of adder D1; Subtracter D2, selector D3 link to each other by signal X; Register RA is exported to subtracter D2 with the incoming frequency parameter A that subtracter D2 deposits by register RA and is linked to each other; Adder D1 links to each other by signal S with subtracter D2; Adder D1 links to each other by signal AS with selector D3; Subtracter D2 links to each other by the output signal X control signal Y of subtracter D2 with signal Y; Selector D3 with link to each other by signal Y with logic D4.
Described any frequency divider, its described and logic D4 are a trigger.
Described any frequency divider, it also is provided with parameter interface D5, connects register RA and register RB, uses in the time of need on-the-fly modifying input frequency signal or output frequency signal in system.
The implementation method of described any frequency divider, its key step is:
A. register RA, the input reference frequency parameter A of depositing, when needs obtained the output frequency signal of assigned frequency, the computational methods that this register is deposited parameter A were:
Frequency/the FD of A=input frequency signal, wherein, FD is the frequency accuracy of output frequency signal behind the frequency division;
Register RB, institute deposit output reference frequency B parameter, and when needs obtained the output frequency signal of assigned frequency, the computational methods that this register is deposited B parameter were:
Frequency/the FD of B=output frequency signal, wherein, FD is the frequency accuracy of output frequency signal behind the frequency division;
B. to exporting the output signal AS summation of reference frequency B parameter and selector D3, output signal is S to adder D1 at the trailing edge of input frequency signal;
C. subtracter D2 asks poor to signal S and input reference frequency parameter A, and with signal X output, when S 〉=A, Y puts 1 with signal simultaneously with the difference of S-A, otherwise signal Y puts 0;
D. selector D3 is that 1 o'clock selection signal X outputs to output signal AS at signal Y, otherwise selects signal S to output to output signal AS;
E. with logic D4 with signal Y and input frequency signal and output output frequency signal.
The implementation method of described any frequency divider, among its described step a, register RB, institute deposits output reference frequency B parameter, when needs obtain the output frequency signal of assigned frequency, the computational methods that this register RB deposits the output frequency B parameter are: the frequency * 2/FD of B=output frequency signal, wherein, FD is the frequency accuracy of output frequency signal behind the frequency division.
The implementation method of described any frequency divider, it is described, and to need the output frequency of assigned frequency be arbitrary value.
The parameter that the implementation method of described any frequency divider, its described register are deposited parameter A or B is during for integer, and A, B multiply by an identical number simultaneously to make them be integer.
The implementation method of described any frequency divider among its described step a, determines that register RA is deposited the input reference frequency parameter A and register RB deposits output reference frequency B parameter, when pressing mark (C/D, C 〉=when D) carrying out frequency division, A=C is set, B=D.
The implementation method of described any frequency divider among its described step a, determines that register RA is deposited the input reference frequency parameter A and register RB deposits output reference frequency B parameter, and (C/D when frequency division is carried out in C 〉=2 * D), is provided with A=C, B=2 * D when pressing mark.
The implementation method of described any frequency divider, maybe (C/D is when frequency division is carried out in C 〉=2 * D) to the frequency * 2/FD of its described B=output frequency signal when pressing mark, with logic D4 be trigger, at the input frequency signal trailing edge, if Y is 1, output frequency signal is reverse, the output output frequency signal.
The implementation method of described any frequency divider, it is provided with interface D5 by parameter, and input reference frequency parameter A, output reference frequency B parameter can be set.
Adopt the method for the invention and device, following advantage can be arranged:
1, designs for pure digi-tal owing to this invention circuit, thereby be convenient to realize, be particularly useful for FPGA (Field Programmable Gate Array) and realize with monolithic integrated circuit;
2, system parameters determines that method is simple;
3, no frequency division error.
Description of drawings
Fig. 1 is a concrete schematic diagram of implementing circuit of the present invention;
Fig. 2 be the present invention by fraction division, A=C, the sequential chart of one 7/2 frequency division that the B=D method realizes.
Fig. 3 be the present invention by fraction division, A=C, the sequential chart of one 7/2 frequency division that B=2 * D method realizes.
Fig. 4 is that the present invention passes through the TMS320C54x series processors, on-the-fly modifies the sequential chart of parameter A, B, and promptly parameter is provided with the sequential chart of the specific embodiment of interface D5.
Embodiment
Embodiment 1:
Referring to Fig. 1, for pressing fraction division, incoming frequency parameter A=C, the fraction frequency device that the output frequency B parameter=the D method realizes mainly comprises an input frequency signal Fin111, an output frequency signal Fout112, with logic D4106, two register RA 101, register RB102, adder D1103, subtracter D2104, selector D3105, parameter is provided with interface D5107, and wherein, register RA 101 is provided with interface D5107 with register RB102 by parameter and links to each other; Contact between register RB102, selector D3105 and the adder D1103 is: the output frequency B parameter 115 that register RB102 deposits, the output signal AS113 of selector D3105 are two addends of adder D1103; Subtracter D2104, selector D3105 link to each other by signal X117; Register RA 101 is exported to subtracter D2104 with the incoming frequency parameter A that subtracter D2104 deposits by register RA 101 and is linked to each other; Adder D1103 links to each other by signal S114 with subtracter D2104; Adder D1103 links to each other by signal S114 with selector D3105; Subtracter D2104 links to each other by the output signal X117 control signal Y118 of subtracter D2104 with signal Y118; Selector D3105 with link to each other by signal Y118 with logic D4106.
Referring to Fig. 2, for pressing fraction division, incoming frequency parameter A=C, the sequential chart of one 7/2 frequency division that output frequency B parameter=D method realizes.The figure shows the timing variations of input frequency signal Fin111, output frequency signal Fout112 and M signal S114, Y118 and AS113.Specifically describe as follows:
1, at first, parameter A=C=7 is set, B parameter=D=2, constantly 1. and hypothesis is before, each signal initial condition is as shown in the figure.That is: signal S114=signal AS113=0, signal Y118 and output frequency signal Fout112 are low level.
2, constantly 1., adder D1103 carries out add operation to B and AS113, output signal S114, i.e. signal S114=signal AS113+ B parameter=0+2=2;
3, constantly 1. arrive the moment 2. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118, i.e. signal X117=signal S114-parameter A=2-7=-5.Because so signal S114＜parameter A is signal Y118=0;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=0, so, signal AS113=signal S114=2;
4, constantly 2., adder D1103 carries out add operation to B parameter and signal AS113, output signal S114, i.e. signal S114=signal AS113+ B parameter=2+2=4;
5, constantly 2. arrive the moment 3. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118, i.e. signal X117=signal S114-parameter A=4-7=-3.Because so signal S114＜parameter A is signal Y118=0;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=0, so, signal AS113=signal S114=4;
6, constantly 3., adder D1103 carries out add operation to B parameter and signal AS113, output signal S114, i.e. signal S114=signal AS113+ B parameter=4+2=6;
7, constantly 3. arrive the moment 4. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118, i.e. signal X117=signal S114-parameter A=6-7=-1.Because so signal S114＜parameter A is signal Y118=0;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=0, so, signal AS113=signal S114=6;
8, constantly 4., adder D1103 carries out add operation, output signal S114 to B parameter and signal AS113.Signal S114=signal AS113+ B parameter=6+2=8;
9, constantly 4. arrive the moment 5. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118.Signal X117=signal S114-parameter A=8-7=1.Because signal S114〉parameter A, so signal Y118=1;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=1, so, signal AS113=signal X117=1;
10, constantly 5., adder D1103 carries out add operation, output signal S114 to B parameter and signal AS113.Signal S114=signal AS113+ B parameter=1+2=3;
11, constantly 5. arrive the moment 6. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118.Signal X117=signal S114-parameter A=3-7=-4.Because so signal S114＜parameter A is signal Y118=0;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=0, so, signal AS113=signal S114=3;
12, constantly 6., adder D1103 carries out add operation, output signal S114 to B parameter and signal AS113.Signal S114=signal AS113+ B parameter=3+2=5;
13, constantly 6. arrive the moment 7. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118.Signal X117=signal S114-parameter A=5-7=-2.Because so signal S114＜parameter A is signal Y118=0;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=0, so, signal AS113=signal S114=5;
14, constantly 7., adder D1103 carries out add operation, output signal S114 to B parameter and signal AS113.Signal S114=signal AS113+ B parameter=5+2=7;
15, constantly 7. arrive the moment 8. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118.Signal X117=signal S114-parameter A=7-7=0.Because so signal S114 〉=parameter A is signal Y118=1;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=0, so, signal AS113=signal X117=0;
16, other cycle, the one-period situation of describing among each several part circuit working state and the 1-14 is similar;
17, in whole scaling-down process, with logic D4106 signal Y118 and input frequency signal Fin111 are carried out the logical AND operation, output output frequency signal Fout112.
Embodiment 2:
Referring to Fig. 1, for pressing fraction division, incoming frequency parameter A=C, the fraction frequency device that the output frequency B parameter=2 * D method realizes, the annexation between its each parts is identical with embodiment one, no longer repeats.
Referring to Fig. 3, for pressing fraction division, incoming frequency parameter A=C, the sequential chart of one 7/2 frequency division that output frequency B parameter=2 * D method realizes.The figure shows the timing variations of input frequency signal Fin111, output frequency signal Fout112 and M signal S114, Y118 and AS113.Specifically describe as follows:
1, at first, parameter A=7 are set, B parameter=4, constantly 1. and hypothesis is before, each signal initial condition is as shown in the figure.That is: signal S114=signal AS113=0, signal Y118 and output frequency signal Fout112 are low level.
2, constantly 1.:
Adder D1103 carries out add operation, output signal S114 to B parameter and signal AS113.Signal S114=signal AS113+ B parameter=0+4=4;
Judge whether that according to the state of signal Y118 needs are reverse with output frequency signal Fout112 with logic D4106.Because signal Y118=0, so, output frequency signal Fout118=0;
3, constantly 1. arrive the moment 2. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118.Signal X117=signal S114-parameter A=4-7=-3.Because so signal S114＜parameter A is signal Y118=0;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=0, so, signal AS113=signal S114=4;
4, constantly 2.:
Adder D1103 carries out add operation, output signal S114 to B parameter and signal AS113.Signal S114=signal AS113+ B parameter=4+4=8;
Judge whether that according to the state of signal Y118 needs are reverse with output frequency signal Fout112 with logic D4106.Because signal Y112=0, so, output frequency signal Fout=0;
5, constantly 2. arrive the moment 3. between:
Subtracter D2104 carries out subtraction to signal S114 and parameter A, output signal X117 and signal Y118.Signal X117=signal S114-parameter A=8-7=1.Because signal S114〉parameter A, so signal Y118=1;
Selector D3105 outputs to signal AS113 according to one among the state selection signal X117 of signal Y118 and the signal S114.Because signal Y118=1, so, signal AS113=signal X117=1;
6, constantly 3.:
Adder D1103 carries out add operation, output signal S113 to B parameter and signal AS113.Signal S113=signal AS113+ B parameter=1+4=5;
Judge whether that according to the state of signal Y118 needs are reverse with output frequency signal Fout112 with logic D4106.Because signal Y118=1, so, output frequency signal Fout=(Fout is reverse)=1;
7, other constantly, each several part circuit working state and 2,3, the situation of description is similar in 4,5,6.
In the time of need obtaining output frequency signal by assigned frequency as for frequency divider, except definite method of parameter A, B parameter was different with above-mentioned two embodiment, the course of work of other frequency divider was identical, when the computational methods of parameter A, B parameter are:
Frequency/FD of parameter A=input frequency signal Fin, frequency/FD of B parameter=output frequency signal Fout; Wherein, when FD shows the frequency accuracy of output frequency signal behind the frequency division, illustrate as follows:
Input reference frequency signal (Fin) is 50MHz, and requiring output frequency signal (Fout) is that unit is adjustable with 10Hz (FD), promptly output frequency can be set to n * 10Hz (0Hz≤n * 10Hz≤50MHz), parameter:
A＝50MHz/10Hz＝50000000/10＝5000000；
When the output frequency signal frequency that requires is 37.68713MHz, parameter:
B＝37.68713MHz/10Hz＝37687130/10＝3768713。
If when obtaining the value of parameter A, B parameter and being not integer, can multiply by an identical number to parameter A, B parameter simultaneously, make them become integer simultaneously, this is calculated as common mathematical computations.
After having determined parameter A, B, frequency divider each several part operating state is identical with embodiment 1.
As frequency/FD of parameter A=input frequency signal Fin, B parameter=(frequency of output frequency signal Fout/FD) * 2; Wherein, when FD shows the frequency accuracy of output frequency signal behind the frequency division, illustrate as follows:
Input reference frequency signal (Fin) is 50MHz, and requiring output frequency signal (Fout) is that unit is adjustable with 10Hz (FD), promptly output frequency can be set to n * 10Hz (0Hz≤n * 10Hz≤25MHz), parameter:
A＝50MHz/10Hz＝50000000/10＝5000000；
When the output frequency signal frequency that requires is 17.68713MHz, parameter:
B＝(17.68713MHz/10Hz)×2＝(17687130/10)×2＝3537426。
If when obtaining the value of parameter A, B parameter and being not integer, can multiply by an identical number to parameter A, B parameter simultaneously, make them become integer simultaneously, this is calculated as common mathematical computations.
After having determined parameter A, B, frequency divider each several part operating state is identical with embodiment 2.
Embodiment 3:
Referring to Fig. 4, for by the TMS320C54x series processors, on-the-fly modify the sequential chart of parameter A, B, promptly parameter is provided with the sequential chart of the specific embodiment of interface D5107.Clkout is the work clock of processor among the figure.The input that parameter is provided with interface D5107 mainly comprises processor address bus Adress, processor data bus Data, processor external memory space visit allows signal Mst register RB102, shows during for low level that permission carries out write operation to external memory space.Parameter is provided with the data that interface D5107 is output as register RA 101 and register RB102.Parameter is provided with interface D5107 and also comprises decoder EA and EB.ACS_ and BCS are respectively register RA 101, the register RB102 that decoder EA and EB generate the permission signal are set among the figure.Suppose that before parameter is set the value in the register RA is A1, the value among the register RB is B1, need be revised as A2 to the value in the register RA now, and the value among the register RB is revised as B2.Its detailed process is:
1, in the moment 1, processor begins by parameter the value that interface D5107 revises register RA 101 to be set, and decoder EA allows signal ACS_ according to being provided with of address bus generation register RA 101 of processor.
2, in the moment 2, externally memory access allows under the triggering of signal Mst register RB102, and the value of data wire Data is latched to register RA 101, and the value of register RA 101 is revised as A2 by A1.
3, in the moment 3, processor begins to connect the value that D5107 revises register RB102 by the parameter setting, and decoder EB allows signal BCS_ according to being provided with of address bus generation register RB102 of processor.
4, in the moment 4, externally memory access allows under the triggering of signal Mst register RB102, and the value of data wire Data is latched to register RB102, and the value of register RB102 is revised as B2 by B1.
Claims (7)
1. any frequency divider includes and logic D4, two register RA, RB, adder
D1, subtracter D2, selector D3 is characterized in that:
Register RA, register RB, selector D3, adder D1, subtracter D2 and and logic D4 between get in touch for: output frequency B parameter that register RB deposits and the output signal AS of selector D3 are two addends of adder D1; Subtracter D2, selector D3 link to each other by signal X; Register RA is exported to subtracter D2 with the incoming frequency parameter A that subtracter D2 deposits by register RA and is linked to each other; Adder D1 links to each other by signal S with subtracter D2; Adder D1 links to each other by signal AS with selector D3; Subtracter D2 links to each other by the output signal X control signal Y of subtracter D2 with signal Y; Selector D3 with link to each other by signal Y with logic D4;
Parameter interface D5 is set, connects register RA and register RB, use in the time of need on-the-fly modifying input frequency signal or output frequency signal in system.
2. any frequency divider as claimed in claim 1 is characterized in that, described and logic D4 is a trigger.
3. the implementation method of any frequency divider as claimed in claim 1 or 2 is characterized in that, key step is:
A. by parameter interface D5 is set, input reference frequency parameter A, output reference frequency B parameter are set;
Register RA, the input reference frequency parameter A of depositing, when needs obtained the output frequency signal of assigned frequency, the computational methods that this register is deposited parameter A were:
Frequency/the FD of A=input frequency signal, wherein, FD is the frequency accuracy of output frequency signal behind the frequency division;
Register RB, institute deposit output reference frequency B parameter, and when needs obtained the output frequency signal of assigned frequency, the computational methods that this register is deposited B parameter were:
Frequency/the FD of B=output frequency signal, wherein, FD is the frequency accuracy of output frequency signal behind the frequency division;
It is described that to need the output frequency of assigned frequency be arbitrary value; The parameter that described register is deposited parameter A or B is during for integer, and A, B multiply by an identical number simultaneously to make them be integer;
B. to exporting the output signal AS summation of reference frequency B parameter and selector D3, output signal is S to adder D1 at the trailing edge of input frequency signal;
C. subtracter D2 asks poor to signal S and input reference frequency parameter A, and with signal X output, when S 〉=A, Y puts 1 with signal simultaneously with the difference of S-A, otherwise signal Y puts 0;
D. selector D3 is that 1 o'clock selection signal X outputs to output signal AS at signal Y, otherwise selects signal S to output to output signal AS;
E. with logic D4 with signal Y and input frequency signal and output output frequency signal.
4. as the implementation method of any frequency divider as described in the claim 3, it is characterized in that, among the described step a, register RB, institute deposits output reference frequency B parameter, and when needs obtained the output frequency signal of assigned frequency, the computational methods that this register RB deposits the output frequency B parameter were: the frequency * 2/FD of B=output frequency signal, wherein, FD is the frequency accuracy of output frequency signal behind the frequency division.
5. as the implementation method of any frequency divider as described in the claim 3, it is characterized in that, among the described step a, determine that register RA deposits input reference frequency parameter A and register RB and deposit output reference frequency B parameter, when pressing mark C/D, and C 〉=D is when carrying out frequency division, A=C is set, B=D.
6. as the implementation method of any frequency divider as described in the claim 3, it is characterized in that, among the described step a, determine that register RA deposits input reference frequency parameter A and register RB and deposit output reference frequency B parameter, when pressing mark C/D, and C 〉=2 * D is when carrying out frequency division, A=C is set, B=2 * D.
7. as the implementation method of any frequency divider as described in claim 4 or 6, it is characterized in that, frequency * the 2/FD of described B=output frequency signal is maybe when pressing mark C/D, and when C 〉=2 * D carries out frequency division, with logic D4 be trigger, at the input frequency signal trailing edge, if Y is 1, output frequency signal is reverse, the output output frequency signal.
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| CNB021399395A CN100373770C (en) | 2002-12-26 | 2002-12-26 | Random frequency divider and realizing method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177861A (en) * | 1996-09-23 | 1998-04-01 | 合泰半导体股份有限公司 | Frequency divider |
| US6084484A (en) * | 1996-10-28 | 2000-07-04 | Holtek Semiconductor Inc. | Programmable precise frequency divider |
| JP2002314404A (en) * | 2001-04-11 | 2002-10-25 | Matsushita Electric Ind Co Ltd | Frequency divider |
-
2002
- 2002-12-26 CN CNB021399395A patent/CN100373770C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177861A (en) * | 1996-09-23 | 1998-04-01 | 合泰半导体股份有限公司 | Frequency divider |
| US6084484A (en) * | 1996-10-28 | 2000-07-04 | Holtek Semiconductor Inc. | Programmable precise frequency divider |
| JP2002314404A (en) * | 2001-04-11 | 2002-10-25 | Matsushita Electric Ind Co Ltd | Frequency divider |
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