CN102315917A - Electricity-saving method and device for signal transmission - Google Patents
Electricity-saving method and device for signal transmission Download PDFInfo
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Abstract
The invention discloses an electricity-saving method and device for signal transmission. The electricity-saving method comprises the following steps of: transmitting a test signal from a local end, wherein the test signal is provided with a first test amplitude which is selected from a plurality of preset amplitudes; if receiving a receiving-confirming signal transmitted by responding the test signal from a remote end, confirming that the remote end receives the first test amplitude of the test signal; and transmitting a data signal, wherein the amplitude of the data signal is based on the first test amplitude. According to the method, the device can be used for transmitting the data signal at a smaller amplitude of the data signal so that the efficacy of saving electricity is achieved.
Description
Technical field
The present invention relates to a kind of method and apparatus that determines data signal amplitude size, especially a kind of method and apparatus that is used for PCI-E (Peripheral Component Interconnect Express) with decision data signal amplitude size.
Background technology
Seeing also Fig. 1, is the voltage of signals figure that the PCI-E of known technology is shown.In general; The signal of PCI-E is a kind of differential wave; Produce a D+ signal (sinusoidal wave like the solid line of Fig. 1) and a D-signal (dotted line like Fig. 1 is oppositely sinusoidal wave) through a differential voltage driver, the potential difference of this D+ signal and this D-signal is a differential voltage, when this D+ voltage of signals during greater than the D-voltage of signals; One positive electricity potential difference is just arranged between D+ signal and D-signal, be called logical one this moment; When this D+ voltage of signals during less than the D-voltage of signals, a negative electricity potential difference is just arranged between D+ signal and D-signal, be called logical zero this moment.When this potential difference is maximum, be called differential crest voltage (differential peak voltage, V
DIFFp), and the twice of differential crest voltage, i.e. maximum gap between this positive electricity potential difference and this negative electricity potential difference, for differential peak value to crest voltage (differential peak-to-peak voltage, V
DIFFp-p), and differential peak value is exactly the signal amplitude between logical one and the logical zero to crest voltage.
Because the needed signal amplitude of different main frame is different, and the required line length of different operating position is also different, and the amplitude of transmission signal of therefore general PCI-E is ordered next standard, enough lets receiving terminal receive to guarantee output amplitude.This regulation and stipulation wherein, the differential peak value that output driver provided needs at 800mV between the 1200mV crest voltage, and receiving terminal will be received at least and obtains the signal that differential peak value is 175mV in the 1200mV scope to crest voltage.By standard, when output provided minimum differential peak value to crest voltage, receiving terminal can be accepted differential peak value the channel attenuation amount of crest voltage is 625mV at most.Yet in fact most situation does not have so a large amount of attenuations, especially under the extremely short situation of line length, need not export so big amplitude, can make receiving terminal can receive information.
Green movement is just being carried out by present society, and the consumption that reduces the energy is exactly a kind of of green movement.In PCI-E, more energy is used in big more amplitude representative; The minimum amplitude gap that enough lets receiving terminal receive that transmit the transmission end is big more, and the energy of representative waste is many more.If can be, and guarantee the fail safe of transmission signals so just can reduce the energy resource consumption that there is no need with lower amplitude.If will reduce signal amplitude, transmit the minimum amplitude that enough lets receiving terminal receive if having no idea to distinguish the transmission end, just can't, the signal that keeps safety and stability reduce signal amplitude under transmitting.
Therefore, because the shortcoming of above-mentioned known technology, this case proposes " a kind of electricity saving method and device that is used for the signal transmission "; Let PCI-E before data-signal transmits, whether accomplish through linking earlier as test, and first training sequence that need be transmitted (Training Sequence 1; TS1); Come minimum amplitude required in the data signal under test transport process,, solve the too problem of power consumption of known technology to reduce the employed voltage of data transfer procedure.
Summary of the invention
The present invention provides a kind of method and apparatus of the amplitude size that determines data signal, and wherein this method is through distinguishing that the transmission end transmits the minimum amplitude that enough lets receiving terminal receive and carry out.
According to a purpose of the present invention; A kind of electricity saving method that is used for the signal transmission is provided; This method comprises the following step: (a) transmit a test signal by a local side, wherein this test signal has one first test amplitude, and this first test amplitude is to be selected from a plurality of preset amplitudes; (b) if receive from what this test signal of far end response was returned and one really collect mail number, confirm that then this far-end has received this first test amplitude of this test signal; And (c) transmitting a data-signal, the amplitude of this data-signal is a benchmark with this first test amplitude.
Preferably; Method according to above-mentioned conception; (b) is further comprising the steps of for its step: (b1) when a Preset Time does not receive really collections of letters that this far-end returns at interval, transmit this test signal with one second test amplitude, wherein this second test amplitude first is tested amplitude greater than this.
Preferably, according to the method for above-mentioned conception, wherein the first test amplitude is the minimum value in these preset amplitudes, and these preset amplitudes are stored in an amplitude table of a mnemon.
Preferably, according to the method for above-mentioned conception, wherein the amplitude of this data-signal is more than or equal to this first test amplitude, and this method is used for the transmission of wire signal.
Preferably, according to the method for above-mentioned conception, wherein this method is used for PCI Express standard; When this local side transmits this data-signal; If this far-end returns at least three not handshaking signals (NAK) continuously, then this data-signal transmits and is regarded as instability, need carry out this electricity saving method again; And when this local side is received at least eight of numbers that this really collects mail number continuously, be regarded as this far-end and receive this test signal.
According to a purpose of the present invention, a kind of data transmitting and receiving device is provided, be used for linking up with a far-end, this data transmitting and receiving device comprises: a mnemon, store an amplitude table, this amplitude table is in order to store a plurality of preset amplitudes; One signal amplitude controller couples this mnemon, and this signal amplitude controller is selected one first amplitude from these preset amplitudes; And an output unit, couple this signal amplitude controller, be that the selection according to this signal amplitude controller transmits an output signal so that this output signal has this first amplitude in fact.
Preferably, the device according to above-mentioned conception also comprises: an input unit, in order to receive an input signal; And an administrative unit, couple this signal amplitude controller and this input unit, and should output signal and this input signal in order to handle.
Preferably, according to the device of above-mentioned conception, wherein this output unit and this input unit are linked up through a first passage and a second channel and this far-end respectively, are definite values on the channel attenuation quality entity of this first passage and this second channel.
Preferably; According to the device of above-mentioned conception, when wherein applying to PCI Express system, this signal amplitude controller; In order to this first amplitude at this data-signal of one first user mode decision, and at this first amplitude of this test signal of one second user mode decision.Other comprises: (Link Training and Status State Machine, LTSSM), and configuration is handled these test signals in order to when this second user mode to the state machine of link training and situation.
Preferably; Method according to above-mentioned conception; When this first user mode transmits this a plurality of data-signal for this output unit, and after this second user mode is regarded as instability for this PCI-Express device is in system boot or initialized state and these a plurality of data-signals of this output unit transmission.
Description of drawings
Fig. 1 is the voltage of signals figure that the PCI Express of known technology is shown;
Fig. 2 is the sketch map of the first embodiment of the present invention;
Fig. 3 is the sketch map of the second embodiment of the present invention;
Fig. 4 is the flow chart of the third embodiment of the present invention; And
Fig. 5 is the flow chart of the fourth embodiment of the present invention.
The main element symbol description
D+ D+ signal D-D-signal
Differential crest voltage 0 logical zero of VDIFFp
1 logical one, 201,301 output units
202,302 input units, 203 administrative units
204,304 signal amplitude controllers, 205,305 mnemons
206,306 amplitude tables
20,30 data transmitting and receiving devices (local side)
211,311 answer unit, 212,312 receiving elements
213 processing units, 21,31 far-ends
22,32 passages, 221,321 first passages
222,322 second channels 303 LTSSM
313 the 2nd LTSSM 41-45 steps
421,441 step 51-55 steps
521 steps
Embodiment
Below describe to the preferred embodiment of this case; Please refer to accompanying drawing; But actual device and practiced method also needn't meet described content fully, know present technique person when under the situation of practicalness that does not break away from this case and scope, making many variations, modification and expansion.
Seeing also Fig. 2, is the sketch map of the first embodiment of the present invention.The first embodiment of the present invention has: data transmitting and receiving device 20, far-end 21 and passage 22; Wherein data transmitting and receiving device 20 also comprises output unit 201, input unit 202, administrative unit 203, signal amplitude controller 204 and mnemon 205; Wherein output unit 201 and input unit 202 couple with administrative unit 203, and output unit 201, administrative unit 203 and mnemon 205 couple with signal amplitude controller 204.Output unit 201 is in order to transmit the output signal, and input unit 202 is in order to receiving inputted signal; Mnemon 205 comprises an amplitude table 206, a plurality of preset amplitudes of amplitude table 206 record; Administrative unit 203 is in order to handle output signal and input signal.In addition, far-end 21 also comprises replys unit 211, receiving element 212 and processing unit 213, wherein replys unit 211 and receiving element 212 and processing unit 213 and couples.Passage 22 comprises first passage 221 and second channel 222; And receiving element 212 receives a plurality of output signals that output unit 201 is transmitted through first passage 221, replys unit 211 and transmits a plurality of input signals that input unit 202 is received through second channel 222.Because first passage 221 and second channel 222 can be the transmission path of a stationary conduit; Therefore the channel attenuation amount of first passage 221 and second channel 222 can't change arbitrarily; It comes down to certain value; So the present invention can use the test signal of output in the signal, a preferred amplitude that tests out is used as exporting the benchmark of the amplitude of the data-signal in the signal.
In the above-described embodiments, input signal can comprise the true collection of letters number.When test signal is sent in 20 tendencies to develop of data transmitting and receiving device; Administrative unit 203 meeting notification signal amplitude controllers 204 are according to the amplitude table 206 of mnemon 205; Select one first amplitude from a plurality of preset amplitudes, and order output unit 201 transmits the receiving element 212 that test signal is given far-end 21 with first amplitude, special instruction be; Mnemon 205 can be a Nonvolatile memory, and amplitude table 206 is stored in wherein; If receiving element 212 receives test signal, can really collect mail and number give input unit 202 through replying unit 211 passbacks; After input unit 202 receives the true collection of letters number; The size of promptly representing first amplitude enough lets receiving element 212 receive test signal; Therefore notify administrative unit 203, conveying to signal amplitude controller 204, and assert that first amplitude can become the benchmark of the amplitude of data-signal.The amplitude of data-signal can equal first amplitude, also can be slightly larger than first amplitude, to guarantee that the stable data transmission can be arranged backward.The value of first amplitude can be stored in the mnemon 205, or can receive amplitude with being denoted as corresponding to a preset amplitude of first amplitude in the amplitude table 206.
If receiving element 212 does not receive first signal; Promptly can't return the true collection of letters number; This moment, first amplitude can't become the benchmark of the amplitude of data-signal, in addition, also can not receive amplitude with being denoted as corresponding to a preset amplitude of first amplitude in the amplitude table 206.Through administrative unit 203 notification signal amplitude controllers 204; Select another preset amplitude according to amplitude table 206, as second amplitude and test, through amplitude measurement repeatedly greater than first amplitude; Can obtain receiving element 212 receivable amplitudes; Be used as the benchmark of the amplitude of data-signal, in a preferred embodiment, the mode of test can be set to the minimum value in a plurality of preset amplitudes by first amplitude; Heighten amplitude more in regular turn, till receiving element 212 can receive test signal.
In different embodiment, after the test of repeatedly testing amplitude, can obtain an at least one set that receives amplitude and be stored in the mnemon 205, a plurality of preset amplitudes are denoted as respectively and can receive amplitude and maybe can not receive amplitude also or in the amplitude table.Then; Signal amplitude controller 204 receives the amplitude from least one; Selected amplitude minimum value is a minimum amplitude, and determines a data signal amplitude identical with minimum amplitude, and then output unit 201 is given receiving element 212 with the data signal amplitude data signal; Data transmitting and receiving device 20 is transmitted, to reach the effect of power saving with the minimum amplitude that far-end 21 can receive.In another embodiment; Also can be from amplitude table 206; Selected than the amplitude of the bigger amplitude of minimum amplitude as data-signal, can't receive the situation of data-signal to guarantee far-end 21 less appearance, so that the data-signal transport process remains on a comparatively stable delivery status.In another embodiment, the amplitude of data-signal also can not pass through amplitude table 206, and arbitrarily selected than the amplitude of the bigger amplitude of minimum amplitude as data-signal, the stability that keeps data-signal to transmit.
In different embodiment; Mnemon 205 has only been stored the amplitude table 206 of a plurality of preset amplitudes; And data transmitting and receiving device 20 has a signal amplitude register (not shown in graphic) in addition; This signal amplitude register can couple with signal amplitude controller 204, and can contain the amplitude that can receive amplitude, minimum amplitude and data-signal in order to storage package, for 204 references of signal amplitude controller.
In different embodiment, if first amplitude is the arbitrary numerical value in the preset amplitude, then the test of first amplitude maybe be directly can be by 21 receptions of far-end, for example: first amplitude is the maximum of preset amplitude.Therefore when first amplitude be not when beginning to test by the minimum value of presetting amplitude; If data transmitting and receiving device 20 receives the true collection of letters number; But administrative unit 203 notification signal amplitude controllers 204; Transmit test signal with one the 3rd amplitude again by output unit 201, and the 3rd amplitude is amplitude less than first amplitude in the preset amplitude.
Seeing also Fig. 3, is the sketch map of the second embodiment of the present invention.Second embodiment is that first embodiment applies to PCI Express system implementation example; Meaning is the system that data transmitting and receiving device 30 and far-end 31 have all used PCI Express; Wherein data transmitting and receiving device 30 also comprises state machine (the Link Training and Status State Machine of output unit 301, input unit 302, the training of first link and situation; LTSSM) 303, signal amplitude controller 304 and mnemon 305; Far-end 31 also comprises replys unit 311, receiving element 312 and the 2nd LTSSM 313, and passage 32 also comprises first passage 321 and second channel 322.Main difference between first embodiment and second embodiment is that administrative unit 203 and processing unit 213 are replaced by a LTSSM 303 and the 2nd LTSSM 313 respectively.
In the above-described embodiments, signal amplitude controller 304 is in order to first amplitude at the data-signal of one first user mode decision output unit 301, and at first amplitude of the test signal of one second user mode decision output unit 301.In addition; When first user mode is output unit 301 data signal; Signal amplitude controller 304 can transmit with first amplitude by order output unit 301; And this second user mode to be output unit 301 be in start or initialized state at data transmitting and receiving device 30, and after data signal is regarded as instability, meaning is answer unit 311 at least three of the passbacks handshaking signals (NAK) not continuously of data sink 31) time; Data-signal transmits and is regarded as instability, and gets into second user mode.In addition, a LTSSM 303 is in order to when second user mode, handles test signal and really collects mail number.Wherein test signal be first training sequence (Training Sequence one, TS1) and second training sequence (Training Sequence TS2), number is TS2 and really collect mail.In the above-described embodiments, when first user mode, the data transmitting and receiving device 30 of PCIExpress system respectively has a data signal processing unit (graphic not shown) in addition with far-end 31, in order to process data signal.
In the above-described embodiments; When signal amplitude controller 304 is in second user mode; Test signal is sent in 30 tendencies to develop of data transmitting and receiving device, and a LTSSM 303 meeting notification signal amplitude controllers 304 are selected one first amplitude according to the amplitude table 306 of mnemon 305 from a plurality of preset amplitudes; And transmit the receiving element 312 that test signal is given far-end 31 with first amplitude by signal amplitude controller 304 order output units 301; What specify is that mnemon 305 can be a Nonvolatile memory, and amplitude table 306 is stored in wherein; If receiving element 312 receives test signal, can give input unit 302 through replying unit 311 passback TS2; After input unit 302 receives TS2, can notify a LTSSM 303, to convey to signal amplitude controller 304; And therefore signal amplitude controller 304 can assert that first amplitude can become the benchmark of the amplitude of data-signal, if receiving element 312 does not receive test signal, promptly can't return TS2; Therefore first amplitude can't become the benchmark of the amplitude of data-signal, at this moment, and through a LTSSM 303 notification signal amplitude controllers 304; Select another preset amplitude according to amplitude table 306, as second amplitude and test, behind amplitude measurement repeatedly greater than first amplitude; Can obtain receiving element 312 receivable amplitudes; As the benchmark of the amplitude of data-signal, in a preferred embodiment, the mode of test can be set to the minimum value in a plurality of preset amplitudes by first amplitude; Heighten amplitude more in regular turn, till receiving element 312 can receive test signal.
In different embodiment, after the test of repeatedly testing amplitude, can obtain an at least one set that receives amplitude and be stored in the mnemon 305.Then; Signal amplitude controller 304 receives the amplitude from least one; Selected amplitude minimum value is a minimum amplitude, and determines a data signal amplitude identical with minimum amplitude, and then output unit 301 is given receiving element 312 with the data signal amplitude data signal; Data transmitting and receiving device 30 is transmitted with the minimum amplitude that far-end 31 can receive, reach the effect of power saving.In another embodiment; Also can be from amplitude table 306; Selected than the amplitude of the bigger amplitude of minimum amplitude as data-signal, can't receive the situation of data-signal to guarantee far-end 31 less appearance, so that the data-signal transport process remains on a comparatively stable delivery status.In another embodiment, the amplitude of data-signal also can not pass through amplitude table 306, and arbitrarily selected than the amplitude of the bigger amplitude of minimum amplitude as data-signal, the stability that keeps data-signal to transmit.
In the above-described embodiments, the amplitude of data-signal and test amplitude are controlled by a differential voltage, produce a differential peak value to crest voltage (V
DIFFp-p), and this differential peak value is to crest voltage (V
DIFFp-p) should be 175mV between the 1200mV, but to meet data sink 31 for the differential peak value of the PCI Express system standard to the crest voltage range of receiving.
Seeing also Fig. 4, is the flow chart of the third embodiment of the present invention.The third embodiment of the present invention is a kind of electricity saving method that is used for the signal transmission.At the beginning, the data transmitting and receiving device 20 as local side 20 can transmit a test signal to far-end 21 (step 41) with one first test amplitude earlier; If far-end 21 receives test signal (step 42), then far-end 21 can passback be really collected mail and number is given local side 20, enough makes far-end 21 receive test signal (step 43) to inform local side 20 first test amplitudes; And signal amplitude controller 204 confirms whether this first test amplitude is the minimum amplitude (step 44) that far-end 21 can receive; If, be benchmark then with this minimum amplitude, the amplitude of selected data signal comes data signal (step 45).
In step 42, if far-end 21 do not receive test signal, then far-end 21 must return the true collection of letters number.Therefore local side 20 if a Preset Time at interval in, during a plurality of true collection of letters that do not receive that far-end 21 returned, local side 20 test signal (step 421) that can retransfer with the one second test amplitude bigger than the first test amplitude.
In step 44; Judge whether to be this minimum amplitude; Must decide according to the mode of amplitude selection, the amplitude that can't receive at these elder generation's all far-ends 21 of definition all belongs at least one amplitude that can not receive, and all far-end 21 receivable amplitudes all belong at least one amplitude that receives.If begin test by a minimum amplitude, improve gradually up to occurring enough making far-end 21 receive one of signal and can receive amplitude, at least one at this moment amplitude that receives only has only one, and this can receive amplitude and is minimum amplitude; If begin test by a very big amplitude; Gradually reduce up to deficiency occurring and can not receive amplitude so that far-end 21 receives one of signal; At least one at this moment amplitude that can not receive only has only one, is minimum amplitude and be slightly larger than at least one minimum value that receives amplitude that can not receive amplitude; Or other non-descending or ascending mode, can be minimum amplitude and select at least one minimum value that receives amplitude through at least one amplitude and at least one mode that can not receive the pinching of amplitude size of receiving.If conclude not to be minimum amplitude, then local side 20 is receiving 21 passbacks of far-end really after the number of collection of letters, and test signal (step 441) can retransfer with one the 3rd test amplitude less than the first test amplitude.
In the above-described embodiments; The amplitude of the first test amplitude, the second test amplitude, the 3rd test amplitude and data-signal all is selected from a plurality of preset amplitude that an amplitude table of a mnemon 205 stored; And at least one amplitude that receives is to produce through repeatedly testing amplitude; And minimum amplitude is to be selected from least one amplitude that receives, thus minimum amplitude also be a plurality of preset amplitudes one of them.
Preferably; In order to ensure in the process of the amplitude that determines data signal, the binding between far-end 21 and the local side 20 can onlinely once once not broken, and therefore can begun to test as the first test amplitude by the minimum value in the preset amplitude; And amplify amplitude gradually; Up to far-end 21 transmit really collect mail number give local side 20 after, local side 20 has been confirmed the amplitude that far-end 21 can receive, with the benchmark of the amplitude of obtaining data-signal.Whole process is merely that to become online ascending mode from broken string be preferred way.
In the above-described embodiments, the amplitude of data-signal can equal minimum amplitude, and when then output unit 201 data signal were given receiving element 212, employed amplitude was the minimum amplitude that far-end 21 can receive, and reaches the effect of power saving.In another embodiment, can from a plurality of preset amplitudes, select to be slightly larger than the amplitude of the amplitude of minimum amplitude as data-signal; To guarantee in the data transfer procedure; Can more stable carrying out, reducing the mistake in the data transmission procedure, and guarantee to have the fail safe of transmission signals.In another embodiment, the amplitude of data-signal also can not selected from a plurality of preset amplitudes, and selected arbitrarily one be slightly larger than minimum amplitude amplitude get final product.
Preferably, this method is used for the transmission of wire signal, has a passage that transmits signal, and in the process that signal transmits, have the situation of amplitude fading in passage.Yet owing to be the wire signal transmission, its transmission channel does not have the situation of any change transmission channel for what fix, so the amplitude fading amount does not have too big variation, it is essentially definite value.So, can select the data signal amplitude that equals or be slightly larger than minimum amplitude for use, keep the data transferring method of stable and power saving.
Seeing also Fig. 5, is the flow chart of the fourth embodiment of the present invention.The fourth embodiment of the present invention is when linking the system that uses PCIExpress as the data transmitting and receiving device of local side 30 30 with far-end 31, a kind of electricity saving method that is used for the signal transmission.Under PCI Express system; In the process of link training; Local side 30 and far-end 31 can transmit mutually first training sequence (Training Sequence one, TS1), when local side 30 or far-end 31 are received the TS 1 that the other side transmits; (Training Sequence two TS2) gives the other side can to return second training sequence.In addition,, also can return TS2 and give the other side, all transmit TS2, also continue to receive the TS2 that the other side is transmitted, just can finish the step of link training up to local side 30 and far-end 31 if local side 30 or far-end 31 are received the TS2 that the other side is transmitted.
At the beginning, local side 30 can be given far-end 31 (step 51) with TS1 or the TS2 that the first test amplitude transmits as test signal; If far-end 31 receives TS1 or TS2 (step 52), then far-end 31 can be given local side 30 by passback TS2, enough makes far-end 31 receive test signal (step 53) to inform local side 30 first test amplitudes; And signal amplitude controller 304 is confirmed the amplitude (step 54) of this first test amplitude for receiving; Can receive amplitude is benchmark, and the amplitude of selected data signal comes data signal (step 55).In step 52, if far-end 31 does not receive TS1 or TS2, then far-end 31 must return TS2.Therefore when local side 30 does not receive the TS2 that far-end 31 returned, local side 30 can retransfer with the one second test amplitude bigger TS1 or TS2 (step 521) than the first test amplitude.
Suppose only to have local side 30 to have this electricity saving method, local side 30 can elder generation be given far-end 31 with the TS1 that one first test amplitude transmits as test signal at the beginning; Because far-end 31 does not have electricity saving method, so the TS1 that far-end 31 is transmitted can make local side 30 can directly receive the TS1 that far-end 31 is transmitted with bigger amplitude transmission; Because what local side 30 received is that TS1 is not TS2, expression far-end 31 is not received the TS 1 that local side 30 is transmitted as yet, so local side 30 changes the transmission (this moment is as step 51) of carrying out the first test amplitude with TS2 as test signal.If far-end 31 continues the TS2 that do not receive that local side transmits; Far-end 31 only can continue to transmit TS1 and give local side 30; Therefore local side 30 can continue to improve amplitude (as step 521), and after far-end 31 receipts obtained TS2, passback TS2 gave local side 30 (as step 53); Just can finish this electricity saving method, and then the amplitude of selected data signal (as step 55).
Suppose that local side 30 and far-end 31 all have this electricity saving method, and local side 30 and far-end 31 all begin to transmit as the first test amplitude with the minimum value in a plurality of preset amplitudes.Local side 30 and far-end 31 all can transmit the TS1 as test signal with the first test amplitude earlier at the beginning; Because both sides have electricity saving method, thus both first tests at the beginning amplitude is neither is enough to make the other side to receive, so both sides' continuous transmission amplitude of lifting oneself all; Suppose that far-end 31 takes the lead in reaching the amplitude that local side 30 can receive, so local side 30 can change with TS2 and send far-end 31 (this moment as step 51) to as the test amplitude, yet far-end 31 is still low because of local side 30 employed amplitudes; And can't receive the TS2 that local side 30 transmits, and local side 30 received be that TS1 is not TS2, so; Except that local side 30 can continue to improve the amplitudes (as step 521), far-end 31 also can continue to improve amplitude, is enough to make far-end 31 to be received up to the amplitude of the TS2 of local side 30; Far-end 31 will stop to improve amplitude because of receiving TS2; And transmit TS2 and give local side 30 (as step 53), and local side 30 is because of receiving TS1, so can directly receive TS2 already; And and then finish whole electricity saving method, with the amplitude (as step 55) of selected data signal.In the aforementioned embodiment,, then do not influence the running of electricity saving method, be merely the difference of priority between the two if take the lead in reaching far-end 31 receivable amplitudes by local side 30.In the aforementioned embodiment; Because in the PCI Express system, local side 30 is at same circuit upward wiring with the first passage 321 and the second channel 322 of far-end 31, the gap of amplitude fading amount between the two is minimum; So; The time difference of receiving the other side's test signal between the two is little, can't cause reaching earlier the far-end of the receivable amplitude of local side, the raising that its amplitude is excessive again.
Preferably; PCI Express system also is not suitable for occurring the online situation of broken string once, and in order to ensure in the process of the amplitude that determines data signal, the link between far-end 31 and the local side 30 can onlinely once once not break; So aforesaid embodiment; Be that the basis is narrated with the first test amplitude for the minimum value in the preset amplitude only, so that the process of whole electricity saving method is merely and becomes onlinely from broken string, amplitude is ascending mode.So, if it is online to accept to break, then be not limited to amplitude by little extremely big, the form that also can be descending or other pinching is carried out.
Preferably, be enough to stablize data signal in order to ensure the amplitude of data-signal, local side 30 must receive continuously that far-end 31 returned can be used as at least eight of the TS2 of the true collection of letters number, just can assert the success that is transmitted as of TS1 or TS2.
Preferably, the amplitude of the first test amplitude, the amplitude after improving and data-signal all is selected from a plurality of preset amplitude that an amplitude table of a mnemon 305 stored.
In the above-described embodiments, data signal amplitude can equal receivable amplitude, and when then output unit 301 data signal were given receiving element 312, employed amplitude was the amplitude that far-end 31 can receive, and reaches the effect of power saving.In another embodiment, can be from the multiple preset amplitude, the selected amplitude of receivable amplitude that be slightly larger than as data-signal; To guarantee in the data transfer procedure; Can more stable carrying out, reducing the mistake in the data transmission procedure, and guarantee to have the stability of transmission signals.In another embodiment, the amplitude of data-signal also can not selected from a plurality of preset amplitudes, can select arbitrarily one be slightly larger than minimum amplitude amplitude get final product.
In the above-described embodiments, in the data-signal transport process, if local side 30 data signal, and far-end 31 assert not have mistake in the data-signal, then far-end 31 can be given local side 30 by passback one handshaking signals (ACK); If far-end 31 receives data-signal, and assert in the data-signal wrong, then far-end 31 can passback one not handshaking signal (NAK) give local side 30.
Preferably; When far-end 31 at least three of passbacks not during handshaking signal (NAK) continuously; Promptly be regarded as data-signal and transmit unstablely, must confirm whether the amplitude of data-signal is suitable, and select the amplitude of a new data-signal again with electricity saving method; To guarantee in the follow-up data-signal transport process, can guarantee to have certain stability.
In the above-described embodiments, this method is used to have hands over the data communication of holding step, makes between local side 30 and the far-end 31, can hold step through friendship, obtains this at least one amplitude of accepting.
In the above-described embodiments, PCI Express system is the transmission of wire signal, has a passage that transmits signal, and in the process that signal transmits, have the situation of amplitude fading in passage.Yet owing to be the wire signal transmission, its transmission channel does not have the situation of any change transmission channel, so the amplitude fading amount does not have too big variation for what fix.So, can select the data signal amplitude that equals or be slightly larger than minimum amplitude for use, keep the data transferring method of stable and power saving.
Preferably, this method can apply to the input/output device that all use PCI Express system.Its range of application even can contain action computing, desktop PC, mobile computer, work station, server and communication platform etc.
Though the present invention discloses as above with embodiment; Yet it is not in order to limit the present invention; Any common knowledge the knowledgeable with the affiliated technical field of the present invention is not breaking away from the spirit and scope of the present invention, when doing various changes and retouching; And can think to carry other various embodiment, so protection scope of the present invention should be as the criterion with the scope that appending claims was defined.
Claims (21)
1. one kind is used for the electricity saving method that signal transmits, and said method comprises the following step:
(a) transmit a test signal by a local side, wherein said test signal has one first test amplitude, and the said first test amplitude is to be selected from a plurality of preset amplitudes;
(b) if receive from what the said test signal of a far end response was returned and one really collect mail number, confirm that then said far-end has received the said first test amplitude of said test signal; And
(c) transmit a data-signal, the amplitude of said data-signal is a benchmark with the said first test amplitude.
2. method according to claim 1, the wherein said first test amplitude is the minimum value in said a plurality of preset amplitude.
3. method according to claim 1, its step (b) also comprises the following step:
(b1) when the said true collection of letters that a Preset Time does not receive that said far-end returns at interval, transmit said test signal with one second test amplitude, the wherein said second test amplitude is greater than the said first test amplitude.
4. method according to claim 3, the wherein said second test amplitude is to be selected from said a plurality of preset amplitude.
5. method according to claim 1, its step (b) also comprises the following step:
(b2) if receive from the said true collection of letters of said far-end passback number, then transmit said test signal with one the 3rd test amplitude less than the said first test amplitude, wherein said the 3rd test amplitude is to be selected from said a plurality of preset amplitude.
6. method according to claim 1, wherein said method is used for the transmission of wire signal, and has a passage between said local side and the said far-end, is definite value on the amplitude fading quality entity of said passage.
7. method according to claim 1, wherein said method are used for PCI Express standard.
8. method according to claim 7, wherein said test signal are first training sequence or second training sequence.
9. method according to claim 7, wherein when said local side transmitted said data-signal, if said far-end returns at least three not handshaking signals continuously, then said data-signal transmitted and is regarded as instability, need carry out said electricity saving method again.
10. method according to claim 7 wherein when said local side is received at least eight of the numbers of the said true collection of letters number continuously, is regarded as said far-end and receives said test signal.
11. a data transmitting and receiving device is used for linking up with a far-end, said data transmitting and receiving device comprises:
One mnemon is stored an amplitude table, and said amplitude table is in order to store a plurality of preset amplitudes;
One signal amplitude controller couples said mnemon, and said signal amplitude controller is selected one first amplitude from said a plurality of preset amplitudes; And
One output unit couples said signal amplitude controller, is that the selection of the said signal amplitude controller of foundation transmits an output signal so that said output signal has said first amplitude in fact.
12. data transmitting and receiving device according to claim 11 also comprises:
One input unit is in order to receive an input signal; And
One administrative unit couples said signal amplitude controller and said input unit, and in order to handle said output signal and said input signal.
13. data transmitting and receiving device according to claim 12, wherein said output signal comprises a data-signal and a test signal, and said input signal comprises one and really collects mail number.
14. data transmitting and receiving device according to claim 13; Wherein said output unit transmits said test signal to behind the said far-end according to said first amplitude; If said input unit receives the said true collection of letters that said far-end returns number, then make said first amplitude become the benchmark of the amplitude of said data-signal.
15. data transmitting and receiving device according to claim 14; Wherein if said data transmitting and receiving device does not receive the said true collection of letters that said far-end returns number; Then notify said signal amplitude controller through said administrative unit; Transmit said test signal with one second amplitude by said output unit, wherein said second amplitude is greater than said first amplitude, and said second amplitude is selected from said a plurality of preset amplitude.
16. data transmitting and receiving device according to claim 14; Wherein if said data transmitting and receiving device receives the said true collection of letters that said far-end returns number; Then notify said signal amplitude controller through said administrative unit; Transmit said test signal with one the 3rd amplitude by said output unit, wherein said the 3rd amplitude is less than said first amplitude, and said the 3rd amplitude is selected from said a plurality of preset amplitude.
17. data transmitting and receiving device according to claim 12; Wherein said output unit and said input unit are linked up through a first passage and a second channel and said far-end respectively, are definite values on the channel attenuation quality entity of said first passage and said second channel.
18. data transmitting and receiving device according to claim 11 is to be used for PCI Express standard.
19. data transmitting and receiving device according to claim 18, wherein said output signal comprises a data-signal and a test signal, and said test signal is one first training sequence or one second training sequence.
20. data transmitting and receiving device according to claim 19; Wherein said signal amplitude controller; In order to determining said first amplitude of said data-signal in one first user mode, and determine said first amplitude of said test signal in one second user mode.
21. data transmitting and receiving device according to claim 20 also comprises:
One input unit is in order to receive an input signal.Said input signal is to comprise one really to collect mail number, and the said true collection of letters number is said second training sequence, and
The state machine of one link training and situation, and configuration is handled said test signal in order to when said second user mode.
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