CN105991122A - Dual-mode serial transmission device and mode switching method thereof - Google Patents
Dual-mode serial transmission device and mode switching method thereof Download PDFInfo
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- CN105991122A CN105991122A CN201510071799.8A CN201510071799A CN105991122A CN 105991122 A CN105991122 A CN 105991122A CN 201510071799 A CN201510071799 A CN 201510071799A CN 105991122 A CN105991122 A CN 105991122A
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Abstract
The invention provides a dual-mode serial transmission device and a mode switching method thereof. The dual-mode serial transmission device comprises first and second current sources, first and second inverting circuits, a differential pair and a resistor string. The first inverting circuit receives a mode selection signal or a first data transmission signal. The second inverting circuit receives the mode selection signal or a second data transmission signal. First and second load terminals of the differential pair are coupled to the first and second inverting circuits respectively. A common terminal of the differential pair is coupled to the second current source. First and second differential input terminals of the differential pair receive the mode selection signal or receive the first and second data transmission signals respectively. The resistor string is connected in series between an output terminal of the first inverting circuit and an output terminal of the second inverting circuit. In the invention, data transmission motions under two kinds of operation modes can be satisfied; an area of a hardware circuit can be effectively reduced; a function of the circuit and production cost are considered and a competition capability of a product is effectively increased.
Description
Technical field
The present invention relates to a kind of double mode serial transmission device and mode switching method thereof.
Background technology
In the serial transmission system of complementary metal oxide semiconductors (CMOS) (CMOS) processing procedure institute construction, often
Transmitting terminal form have low-voltage differential signal pattern (Low voltage differential signal, be called for short
LVDS) with current mode logic pattern (Current mode logic is called for short CML) two kinds.Refer to figure
1A and Figure 1B, Figure 1A and Figure 1B are shown respectively low-voltage differential signal transmission mode and electric current
The circuit diagram of two kinds of transmitting devices of logic model.In figure ia, low-voltage differential signal transmission mode
Serial transmission device 110 is made up of current source IS1, IS2, switch S1～S4 and resistance R1.And
In fig. ib, the serial transmission device 120 of current logic pattern is then by switch S5, S6, current source IS3
And provide the resistance being pulled to operate the path of power supply VCC to constitute.Wherein, serial transmission device
110,120 output signal OUTP of complementation, OUTN are produced by the switching action of switch belonging to it.
It it is no matter the serial transmission dress of low-voltage differential signal transmission mode or current logic analog form
Put.Owing to controlling the imperfection of control signal of switch S1～S6, control signal carry out logic 1 with
The transition status of one section of transition can be experienced between logical zero during switching, and this transition status often produces common mode
The big main cause of the one of noise, and and then form the Electromagnetic Interference to total system.
Summary of the invention
The present invention provides a kind of double mode serial transmission device and mode switching method thereof, can meet two kinds of behaviour
Data transfer activity under operation mode.
The double mode serial transmission device of the present invention includes the first current source, the first negater circuit, second anti-
To circuit, the second current source, differential pair and resistance string.First and second negater circuit couples the first electric current
Source.First negater circuit receives mode select signal or first data transmission signal, and the second negater circuit connects
Receiving mode select signal or the second data transfer signal, first and second load end of differential pair is respectively coupled to
To first and second negater circuit, the common end of differential pair is coupled to the second current source, the first of differential pair
And second differential input end receive mode select signal or receive first and second data transfer signal respectively.
Resistance string has the first resistance and the second resistance, and it is the most electric that first and second resistance is mutually serially connected with first
Between the outfan on road and the outfan of the second negater circuit.
In one embodiment of this invention, in the first mode of operation, first and second negater circuit is respectively
Receiving first and second data transfer signal, first and second differential input end of differential pair receives pattern choosing
Select signal；Under one second operator scheme, first and second negater circuit receives mode signal, differential pair
First and second differential input end receive first and second data transfer signal respectively.
In one embodiment of this invention, the first above-mentioned operator scheme is that low-voltage differential signal transmits mould
Formula, the second operator scheme is current logic pattern.
The mode switching method of the double mode serial transmission device of the present invention includes: in the first mode of operation,
There is provided mode select signal to differential pair, make differential pair turn on the connection between the first negater circuit and common end
Path, and turn on the access path between the second negater circuit and common end；And, in the second operator scheme
Under, it is provided that mode select signal to first and this second negater circuit, use conducting the first load end and the
The access path of the outfan of one negater circuit, and turn on the second load end and the output of the second negater circuit
The access path of end.
Based on above-mentioned, the present invention passes through the double mode serial transmission device provided, by providing pattern to select
Select signal to make double mode serial transmission device can select to be operated in different modes of operation.As
This one, under the data transfer demands that can meet multiple modes of operation, it is also possible to effectively reduce hardware
The area of circuit, takes into account function and the production cost of circuit, the competitiveness of effective improving product.
For the features described above of the present invention and advantage can be become apparent, special embodiment below, and coordinate
Accompanying drawing is described in detail below.
Accompanying drawing explanation
Figure 1A and Figure 1B is shown respectively low-voltage differential signal transmission mode and current logic pattern two
Plant the circuit diagram of transmitting device；
Fig. 2 illustrates the schematic diagram of the double mode serial transmission device of one embodiment of the invention；
Fig. 3 illustrates the schematic diagram of the double mode serial transmission device of another embodiment of the present invention；
Fig. 4 A illustrate the double mode serial transmission device of the embodiment of the present invention in the first mode of operation etc.
Effect circuit diagram；
Fig. 4 B first data transmission signal after adjustment is shown and adjusts after the oscillogram of the second data transfer signal；
Fig. 5 A illustrates the equivalence in the second mode of operation of the double mode serial transmission device of the embodiment of the present invention
Circuit diagram；
Fig. 5 B first data transmission signal after adjustment is shown and adjusts after the oscillogram of the second data transfer signal；
Fig. 6 illustrates the flow chart of the mode switching method of the double mode serial transmission device of the embodiment of the present invention.
Description of reference numerals:
110,120: serial transmission device；
200,300: double mode serial transmission device；
IS1, IS2, IS3: current source；
211,212: negater circuit；
220: differential pair；
230: resistance string；
VCC: operation power supply；
LT1, LT2: load end；
MS: mode select signal；
DIN1: first data transmission signal；
DIN2: the second data transfer signal；
CT: jointly hold；
VSS: with reference to earth terminal；
R1, R2, R3: resistance；
SW1, SW2, SW3, SW4, SW5, SW6, S1, S2, S3, S4, S5, S6: switch；
M1, M2, M3, M4, M5, M6: transistor；
DI1, DI2: differential input end；
OUTP, OUTN: output signal；
PDRV1, PDRV2, PDRV3, PDRV4: pre-driver；
VCR: staggered voltage；
PDIN1: first data transmission signal after adjustment；
PDIN2: the second data transfer signal after adjustment；
VREF1, VREF2: preset voltage value；
S610, S620: mode handoff procedures.
Detailed description of the invention
Refer to the schematic diagram that Fig. 2, Fig. 2 illustrate the double mode serial transmission device of one embodiment of the invention.
Double mode serial transmission device 200 include current source IS1, IS2, negater circuit 211,212, differential pair
220 and resistance string 230.Current source IS1 is coupled in operation power supply VCC and negater circuit 211,212
Between, and current direction negater circuit 211,212 is provided.Negater circuit 211 is then coupled in current source IS1
And between the load end LT1 of differential pair 220, negater circuit 211 and receive mode select signal MS or
It is to receive first data transmission signal DIN1.It addition, negater circuit 212 be coupled in current source IS1 and
Between the load end LT2 of differential pair 220, negater circuit 212 also receives mode select signal MS or connects
Receive the second data transfer signal DIN2.
Differential pair 220 is coupled between current source IS2 and negater circuit 211,212.Wherein, differential pair
The differential input end DI1 of 220 receives first data transmission signal DIN1 or mode select signal MS,
The differential input end DI2 of differential pair 220 receives the second data transfer signal DIN2 or model selection letter
Number MS, and the common end CT of differential pair 220 is coupled to current source IS2.Current source IS2 then concatenates
Between the common end CT and reference earth terminal VSS of differential pair 220, wherein, current source IS2 is provided
Electric current by jointly holding CT to flow to reference to earth terminal VSS.
Resistance string 230 is serially connected between the outfan of negater circuit 211 and 212.Wherein, in this enforcement
In example, resistance string 230 includes resistance R1 and R2 of concatenation.
In terms of the action details of double mode serial transmission device 200, wherein, negater circuit 211,
212 and differential pair 220 receive mode select signal MS or first, second data transfer signal
DIN1, DIN2 are based on what the operator scheme at double mode serial transmission device 200 place defined.Tool
Body illustrates, when double mode serial transmission device 200 in the first mode of operation, negater circuit 211,
212 receive first, second data transfer signal DIN1, DIN2, and differential pair 220 then receives pattern choosing
Select signal MS.Relative, when double mode serial transmission device 200 in the second mode of operation, reversely electricity
Road 211,212 receives mode select signal MS, and differential pair 220 then receives first, second data and passes
Defeated signal DIN1, DIN2.Wherein, first, second data transfer signal DIN1, DIN2 can be
Complementary signal.
It is noted that the first above-mentioned operator scheme can be low-voltage differential signal transmission mode,
Second operator scheme can be then current logic pattern.
Carefully illustrating, negater circuit 211 includes switching SW1 and SW2.One end coupling of switch SW1
Being connected to current source IS1, its other end is coupled to resistance string 230.One end of switch SW2 is then coupled to electricity
Resistance string 230 couples end jointly with switch SW1's, and the other end of switch SW2 is then coupled to differential pair 220
Load end LT1.Switch SW1 and SW2 receives first data transmission the most jointly
Signal DIN1, receives mode select signal MS the most jointly.
Negater circuit 212 includes switching SW3 and SW4.One end of switch SW3 is coupled to current source IS1,
Its other end is coupled to resistance string 230.One end of switch SW4 is then coupled to resistance string 230 and switch
SW3 couples end jointly, and the other end of switch SW4 is then coupled to the load end LT2 of differential pair 220.
Switch SW3 and SW4 receives the second data transfer signal DIN2 the most jointly, the
Mode select signal MS is the most jointly received under two operator schemes.
Additionally, switch SW1～SW4 is respectively by the transistor switch of transistor M1～M4 institute construction.
Wherein, transistor M1, M3 are P-type transistor, and transistor M2, M4 are the transistor of N-type.
It is to say, the state being turned on or off of switch SW1 and switch SW2 is contrary, switch SW3
It is contrary with the state being turned on or off of switch SW4.
Differential pair 220 includes switching SW5 and switch SW6.One end of switch SW5 is coupled to difference
Load end LT1 to 220 switchs the other end of SW5 and is then coupled to current source IS2.Switch SW6
One end be coupled to the load end LT2 of differential pair 220 and switch the other end of SW6 and be then coupled to electric current
Source IS2.
Switch SW5～switch SW6 can be made up of transistor M5 and transistor M6 respectively.In this reality
Executing in example, transistor M5 and transistor M6 can be N-type transistor.
Subsidiary one carries, when double mode serial transmission device 200 works in the second mode of operation, and electricity
The end points that resistance R1 couples with resistance R2 phase, can be connected to operate power supply VCC.
Hereinafter refer to Fig. 3, Fig. 3 and the showing of double mode serial transmission device of another embodiment of the present invention is shown
It is intended to.Double mode serial transmission device 300 includes double mode serial transmission device 200 and pre-driver
PDRV1～PDRV4.Pre-driver PDRV1, PDRV2 are respectively coupled to negater circuit 211,212,
Pre-driver PDRV3, PDRV4 be then respectively coupled to differential pair 220 differential input end DI1 and
DI2.Carefully illustrating, pre-driver PDRV1 is serially connected in negater circuit 211 and receives mode select signal
Between the path of MS or first data transmission signal DIN1, pre-driver PDRV2 is serially connected in negater circuit
Between 212 paths receiving mode select signal MS or the second data transfer signal DIN2, pre-driver
PDRV3 is serially connected in the differential input end DI1 of differential pair 220 and receives mode select signal MS or first number
Between the path according to transmission signal DIN1, and the difference that pre-driver PDRV4 is serially connected in differential pair 220 is defeated
Enter to hold DI2 to receive between the path of mode select signal MS or the second data transfer signal DIN2.
Pre-driver PDRV1～PDRV4 can adjust the driving energy of received signal as buffer
Power, and the signal after buffering is sent to negater circuit 211,212 and the Differential Input of differential pair 220
End DI1 and DI2.In embodiments of the present invention, pre-driver PDRV1～PDRV4 can also be for institute
The state switching points of the signal received is adjusted.And about turning that pre-driver PDRV1～PDRV4 is carried out
The details of state point adjustment action, will be described in more detail in follow-up embodiment.
Illustrate that please also refer to Fig. 4 A, Fig. 4 A the double mode serial transmission device 300 of the embodiment of the present invention exists
Schematic equivalent circuit under first operator scheme.Wherein, in the first mode of operation (LVDS mode),
The grid of transistor M5, M6 in double mode serial transmission device 300 receives equal to logic high potential
Mode select signal MS and be switched on, current source IS2 can be considered as being connected directly to transistor M2
And M4.
It addition, in the first mode of operation, pre-driver PDRV1, PDRV2 receive first respectively,
Second data transfer signal DIN1 and DIN2, pre-driver PDRV1 the output letter produced
Number it is sent to switch the control end of SW1, SW2, the output letter that pre-driver PDRV2 is then produced
Number it is sent to switch the control end of SW3, SW4.The action that is turned on or off of switch SW1, SW2 is
Complementary, the action that is turned on or off of switch SW3, SW4 is complementary, and switchs SW1, SW3
The action that is turned on or off be complementary.Consequently, it is possible to equivalent circuit 400 can be according to first, second
The switching action of switch SW1～SW4 that data transfer signal DIN1 and DIN2 is controlled, produces mutually
Output signal OUTP mended and OUTN are to carry out the transmission action of data.
Further illustrate, when switching SW1, SW4 conducting (switch SW2, SW3 disconnect),
Output signal OUTP is driven high according to current source IS1, and output signal OUTN is according to current source IS2 quilt
Drag down, relative, when switching SW1, SW4 and disconnecting (switch SW2, SW3 conducting), output
Signal OUTN is driven high according to current source IS1, and output signal OUTP is pulled low according to current source IS2.
It is noted that under the transmission mode of the first operator scheme (LVDS), pre-driver PDRV1
And PDRV2 can be respectively directed to first data transmission signal DIN2 and the second data transfer signal
After the state switching points of DIN2 is adjusted and produces after adjustment first data transmission signal PDIN1 and adjusts
Second data transfer signal PDIN2.Refer to Fig. 4 B, Fig. 4 B and first data transmission letter after adjustment is shown
Number PDIN2 and the oscillogram of the second data transfer signal PDIN2 after adjusting.Wherein, after adjustment first
After data transfer signal PDIN2 and adjustment, the second data transfer signal PDIN2 produces staggered staggered electricity
Pressure VCR is turned down, and staggered voltage VCR can be turned down to less than preset voltage value VREF1.Here,
It is operation power supply in common-mode voltage ((output signal OUTP+ output signal OUTN)/2) electrical specification
VCC 1/3 or 1/4 when, preset voltage value VREF1 can be operation power supply VCC electricity
The half or lower of pressure value.After the adjustment first data transmission signal PDIN1 and adjust after the second data
Under conditions of the staggered voltage of transmission signal PDIN2 is turned down, can avoid at first data transmission signal
During PDIN1 or the conversion of the second data transfer signal PDIN2 polarity of voltage, pass in double mode serial
The outfan of defeated device 300 produces the situation of common mode noise and (i.e. switchs SW1, SW3 to be disconnected, switch
SW2 and SW4 is switched on, and common-mode voltage is pulled downwardly and pulls), also consequently, because switch SW1～SW4
The produced electromagnetic interference of switching can drop minimum, the usefulness of promotion signal transmission.
Hereinafter refer to Fig. 5 A, Fig. 5 A and the double mode serial transmission device 300 of the embodiment of the present invention is shown
Schematic equivalent circuit in the second mode of operation.Wherein, in the second mode of operation (CML pattern),
The grid of transistor M1, M3 in double mode serial transmission device 300 receives equal to logic high potential
Mode select signal MS and be disconnected, the grid of transistor M2, M4 receives equal to logic high potential
Mode select signal MS and be switched on, and in the case, current source IS1 can be considered as directly being connected
It is connected to transistor M5 and M6.
Equivalent circuit 500 represents double mode serial transmission device 300 equivalent electric in the second mode of operation
Lu Tu.Wherein, pre-driver PDRV3 and PDRV4 receives first, second data transmission letter respectively
Number DIN1 and DIN2 data transfer signal PDIN1 and PDIN2 after producing adjustment.It addition,
The end points that resistance R1, R2 phase couples, in the second mode of operation, can be coupled to operate power supply VCC.
After adjustment, data transfer signal PDIN1 and PDIN2 is respectively sent to transistor M5 and M6
Grid be turned on or off to be supplied to it, and by data transfer signal PDIN1 after complementary adjustment and
PDIN2, equivalent circuit 500 produces output signal OUTP of complementation and OUTN to be transmitted
Action.
Further illustrate, when transistor M5 is switched on (transistor M6 is disconnected), output letter
Number OUTP is pulled low according to current source IS2, and output signal OUTN is carried logical according to resistance R2
Draw high path to be pulled to operate power supply VCC.Relative, (the transistor when transistor M6 is switched on
M5 is disconnected), output signal OUTN is pulled low according to current source IS2, and output signal OUTP
Carried logical path of drawing high according to resistance R1 to be pulled to operate power supply VCC.
Pre-driver PDRV3 and PDRV4 adjusts first, second data transfer signal DIN1 respectively
And the state switching points of DIN2 produces data transfer signal PDIN1 and PDIN2 after adjustment respectively.With
Under refer to after Fig. 5 B, Fig. 5 B illustrates after adjustment first data transmission signal PDIN2 and adjusts second
The oscillogram of data transfer signal PDIN2.Wherein, in the present embodiment, pre-driver PDRV3 with
And PDRV4 makes to produce when data transfer signal PDIN1 and PDIN2 transition after adjustment staggered staggered
Voltage VCR is higher than preset voltage value VREF2.Here, preset voltage value VREF2 can be operation electricity
The half or higher of the magnitude of voltage of source VCC.First data transmission signal PDIN2 and tune after the adjustment
Under conditions of after whole, the staggered voltage VCR of the second data transfer signal PDIN2 is raised, transistor M5
And the situation that M6 simultaneously closes off can effectively be avoided (now output signal OUTP and OUTN
Pullled to high potential by resistance R1 and R2 respectively, i.e. can produce the common-mode voltage of rising), the most therefore,
Because the produced electromagnetic interference of transistor M5 and M6 switching can drop minimum, promotion signal transmits
Usefulness.
Hereinafter refer to the pattern that Fig. 6, Fig. 6 illustrate the double mode serial transmission device of the embodiment of the present invention
The flow chart of changing method.It is double mode that method shown in Fig. 6 is suitable for application in as shown in Fig. 2, Fig. 3
In serial transmission device 200,300.In step S610, in the first mode of operation, it is provided that pattern
Selection signal is to differential pair, and makes differential pair turn on the access path between the first negater circuit and common end,
And turn on the access path between the second negater circuit and common end.In step S620, then in the second operation
Under pattern, it is provided that mode select signal to first and this second negater circuit, use conducting the first load end
With the access path of the outfan of the first negater circuit, and turn on the second load end and the second negater circuit
The access path of outfan.
About the implementation detail of above-mentioned steps, the embodiment stated before this invention is discussed in detail,
Pardon at this and seldom repeat.
In sum, the present invention carrys out the double mode serial transmission device of construction by integrating serial transmission device,
Make double mode serial transmission device can operate respectively in the first and second operation by mode select signal
Under pattern.Consequently, it is possible to by simple signal behavior, double mode serial transmission device can be grasped respectively
Make in different modes, to promote its scope that can use.It is noted that implement in the present invention one
In example, by the adjustment for data input signal state switching points, because of switch in double mode serial transmission device
The electromagnetic interference that switching produces can effectively reduce, the quality of promotion signal transmission.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, rather than right
It limits；Although the present invention being described in detail with reference to foregoing embodiments, this area common
Skilled artisans appreciate that the technical scheme described in foregoing embodiments still can be modified by it,
Or the most some or all of technical characteristic is carried out equivalent；And these amendments or replacement, and
The essence not making appropriate technical solution departs from the scope of various embodiments of the present invention technical scheme.
Claims (14)
1. a double mode serial transmission device, it is characterised in that including:
First current source；
First negater circuit, couples this first current source, receives mode select signal or first data transmission
Signal；
Second negater circuit, couples this first current source, receives this mode select signal or the second data pass
Defeated signal；
Second current source；
Differential pair, its first and second load end is respectively coupled to this first and second negater circuit, and it is altogether
Being coupled to this second current source with end, first and second differential input end of this differential pair receives the choosing of this pattern
Select signal or receive respectively this first and this second data transfer signal；And
Resistance string, has the first resistance and the second resistance, this first and this second resistance be mutually serially connected with
Between the outfan of this first negater circuit and the outfan of this second negater circuit.
Double mode serial transmission device the most according to claim 1, it is characterised in that the first behaviour
Under operation mode, this first and this second negater circuit receive respectively this first and this second data transfer signal,
This differential pair this first and this second differential input end receive this mode select signal, second operate mould
Under formula, this first and this second negater circuit receive this mode signal, this differential pair this first and this
Two differential input ends receive respectively this first and this second data transfer signal.
Double mode serial transmission device the most according to claim 2, it is characterised in that this is first anti-
Include to circuit:
First switch, is serially connected between this first current source and this resistance string, and this first switch is according to this pattern
Select signal or this first data transmission signal to be turned on or off；And
Second switch, is serially connected between this resistance string and this first load end, and this second switch is according to this pattern
Select signal or this first data transmission signal to be turned on or off；
This second negater circuit includes:
3rd switch, is serially connected between this first current source and this resistance string, and the 3rd switch is according to this pattern
Select signal or this second data transfer signal to be turned on or off；And
4th switch, is serially connected between this resistance string and this second load end, and the 4th switch is according to this pattern
Select signal or this second data transfer signal to be turned on or off.
Double mode serial transmission device the most according to claim 3, it is characterised in that this second
Under operator scheme, this first and the 3rd switch be disconnected according to this mode select signal, this second and should
4th switch is switched on according to this mode select signal.
Double mode serial transmission device the most according to claim 2, it is characterised in that this differential pair
Including:
5th switch, is coupled between this first load end and this common end, and the 5th switch is according to this pattern
Select signal or this first data transmission signal to be turned on or off；And
6th switch, is coupled between this second load end and this common end, and the 6th switch is according to this pattern
Select signal or this second data transfer signal to be turned on or off.
Double mode serial transmission device the most according to claim 5, it is characterised in that this first
Under operator scheme, the 5th and the 6th switch is disconnected according to this mode select signal.
Double mode serial transmission device the most according to claim 2, it is characterised in that this second
Under operator scheme, this first with this second resistance jointly couple end be applied in this double mode serial transmission dress
The operation power supply put.
Double mode serial transmission device the most according to claim 1, it is characterised in that also include:
First pre-driver, is coupled in this first negater circuit and receives this mode select signal or this first number
Between the path according to transmission signal；
Second pre-driver, is coupled in this second negater circuit and receives this mode select signal or this second number
Between the path according to transmission signal；
3rd pre-driver, be coupled in this first differential input end receive this mode select signal or this first
Between the path of data transfer signal；And
4th pre-driver, be coupled in this second differential input end receive this mode select signal or this second
Between the path of data transfer signal.
Double mode serial transmission device the most according to claim 2, it is characterised in that this first behaviour
Operation mode is low-voltage differential signal transmission mode, and this second operator scheme is current logic pattern.
Double mode serial transmission device the most according to claim 2, it is characterised in that this
Under one operator scheme, this first with staggered voltage during this second data transfer signal transition less than first pre-
If magnitude of voltage, in this second operation mode, this staggered voltage is higher than the second preset voltage value, and this is first years old
Preset voltage value is less than or equal to this second preset voltage value.
11. 1 kinds of mode switching methods, it is adaptable to double mode serial transmission as claimed in claim 1 fills
Put, it is characterised in that including:
In the first mode of operation, it is provided that this mode select signal, to this differential pair, makes this differential pair turn on
Access path between this first negater circuit and this common end, and it is common with this to turn on this second negater circuit
Access path between end；And
In the second mode of operation, it is provided that this mode select signal to this first and this second negater circuit,
Use the access path of the outfan turning on this first load end and this first negater circuit, and turn on this
The access path of the outfan of two load ends and this second negater circuit.
12. mode switching methods according to claim 11, it is characterised in that also include:
Under this first operator scheme, provide respectively this first and this second data transfer signal to this first
And this second reverser；And
In this second operation mode, provide respectively this first and this second data transfer signal to this difference
To this first and this second differential input end.
13. mode switching methods according to claim 11, it is characterised in that this first operation mould
Formula is low-voltage differential signal transmission mode, and this second operator scheme is current logic pattern.
14. mode switching methods according to claim 11, it is characterised in that in this first operation
Under pattern, this first with staggered voltage during this second data transfer signal transition less than the first predeterminated voltage
Value, in this second operation mode, this staggered voltage is higher than the second preset voltage value, this first default electricity
Pressure value is less than or equal to this second preset voltage value.
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| WO2021203513A1 (en) * | 2020-04-08 | 2021-10-14 | 澜起电子科技(昆山)有限公司 | Switch current source circuit and method for quickly establishing switch current source |
| CN113541732A (en) * | 2020-04-19 | 2021-10-22 | 联咏科技股份有限公司 | Hybrid transmitter |
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| US20020167333A1 (en) * | 2001-04-17 | 2002-11-14 | Toshimasa Usui | Differential signal output circuit |
| CN101431487A (en) * | 2007-11-09 | 2009-05-13 | 联咏科技股份有限公司 | Low voltage differential signal transmitter and low voltage differential signal transmission method |
| US20110074461A1 (en) * | 2009-09-28 | 2011-03-31 | Hitachi, Ltd. | Serial output circuit, semiconductor device, and serial transmission method |
| CN103248352A (en) * | 2012-11-26 | 2013-08-14 | 威盛电子股份有限公司 | Low voltage differential signal driving circuit and digital signal transmitter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021203513A1 (en) * | 2020-04-08 | 2021-10-14 | 澜起电子科技(昆山)有限公司 | Switch current source circuit and method for quickly establishing switch current source |
| CN113541732A (en) * | 2020-04-19 | 2021-10-22 | 联咏科技股份有限公司 | Hybrid transmitter |
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