CN107256194A - Data transmission circuit and method - Google Patents
Data transmission circuit and method Download PDFInfo
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- CN107256194A CN107256194A CN201710406015.1A CN201710406015A CN107256194A CN 107256194 A CN107256194 A CN 107256194A CN 201710406015 A CN201710406015 A CN 201710406015A CN 107256194 A CN107256194 A CN 107256194A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000008054 signal transmission Effects 0.000 claims abstract description 43
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- 238000006243 chemical reaction Methods 0.000 claims description 16
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/36—Preventing errors by testing or debugging software
- G06F11/362—Software debugging
- G06F11/3648—Software debugging using additional hardware
- G06F11/3656—Software debugging using additional hardware using a specific debug interface
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Abstract
The invention provides a kind of data transmission circuit and method, the data transmission circuit includes multiple artificial circuits, an emulator and a host computer, wherein：Each artificial circuit includes subsystem, the first change-over circuit, the second change-over circuit and transmission line, in each artificial circuit, signal transmission can be carried out between the subsystem and first change-over circuit, signal transmission can be carried out between the transmission line and first change-over circuit and the second change-over circuit；Between multiple artificial circuits, signal transmission can be carried out between second change-over circuit of each artificial circuit, signal transmission can be carried out between the emulator and some described second change-over circuit, signal transmission can be carried out between the host computer and the emulator.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of data transmission circuit and method.
Background technology
Joint test working group interface (jtag interface) is a kind of specified in IEC 1149.1
Boundary scan agreement, as shown in figure 1, subsystem interface 112 is used for possessing the chip under test 111 of jtag interface and its periphery electricity
The external interface bus state of the subsystem 11 of road composition is scanned.Data signal processor, microprocessor, field-programmable
The interface that all kinds of chips such as gate array are all communicated using jtag interface as its kernel with host computer 13, and thus develop emulator
12, as emulator interface 121 and the change-over circuit of host computer interface 131, emulator 12 includes the (JTAG of emulator interface 121
Interface) and usb 1 22, realize the on-line debugging of subsystem 11.Different, the control of jtag interface according to the characteristic of all kinds of devices
Ability processed, which is received, significantly to be restricted, and the distance that jtag interface cable is also specify in standard 1149.1 is limited to 10 inches
(25.4cm), the distance limited for the cable of high speed integrated circuit is 6 inches (15.24cm) or even shorter.To jtag interface
The limitation of length of cable ensure that the stability of signal transmission, but need over long distances to carry out chip under many occasions hard
Part artificial debugging and program burn writing --- it is just extremely inconvenient using general jtag interface under this occasion.
In addition, as shown in Fig. 2 meeting multiple tested cores for possessing jtag interface of JTAG protocol as defined in standard 1149.1
Piece 211 can be cascaded, can be same when being commonly designed in order to which board debugs quantity that is convenient and reducing the total debugging interface of board
The jtag interface of the similar chip under test 211 for possessing jtag interface in individual subsystem 21 cascades up, and then only provides one
Subsystem interface is used as debugging interface, you can all similar chips in debugging board.But when there is multiple similar boards, i.e., it is sub
During system 21, just each board can only be debugged respectively by multiple emulators 22, as shown in Figure 2.I.e. when multiple subsystems need
During test, each subsystem can only be debugged respectively by multiple emulators, it is necessary to which multiple emulators 22 are connected to subsystem
Between 21 and host computer 23, the interface shortage of host computer 23 is caused, multiple emulators 22 also substantially increase hardware cost.
Accordingly, it would be desirable to design the data transmission circuit and method of a kind of simplification to solve the problem of host computer interface is short.
The content of the invention
It is an object of the invention to provide a kind of data transmission circuit and method, to solve existing host computer interface shortage
The problem of.
In order to solve the above technical problems, the present invention provides a kind of data transmission circuit, the data transmission circuit includes many
Individual artificial circuit, an emulator and a host computer, wherein：
Each artificial circuit includes subsystem, the first change-over circuit, the second change-over circuit and transmission line, each
In the artificial circuit, signal transmission can be carried out between the subsystem and first change-over circuit, the transmission line with
Signal transmission can be carried out between first change-over circuit and the second change-over circuit；Between multiple artificial circuits, respectively
Signal transmission can be carried out between second change-over circuit of the individual artificial circuit, the second conversion in each artificial circuit
Circuit includes first interface and second interface, wherein：Multiple artificial circuits are arranged in order, the latter individual artificial circuit
The second interface interpolation of the first interface and the previous artificial circuit, the second of the artificial circuit foremost
The first interface of change-over circuit and the emulator interpolation；Second conversion of the emulator and artificial circuit foremost
Signal transmission can be carried out between circuit, signal transmission can be carried out between the host computer and the emulator；
In each artificial circuit, first change-over circuit includes first single-ended-differential signal change-over circuit, the
One differential signal transtation mission circuit and the first differential signal receiving circuit, second change-over circuit include second single-ended-difference letter
Number change-over circuit, the second differential signal transtation mission circuit and the second differential signal receiving circuit, wherein：
Single-ended signal in the subsystem is converted to differential signal by described first single-ended-differential signal change-over circuit,
Described first single-ended-differential signal change-over circuit provides the differential signal to the first differential signal transtation mission circuit, described
One differential signal transtation mission circuit provides the differential signal to the transmission line；
Single-ended signal in the emulator is converted to differential signal by described second single-ended-differential signal change-over circuit,
Described second single-ended-differential signal change-over circuit provides the differential signal to the second differential signal transtation mission circuit, described
Two differential signal transtation mission circuits provide the differential signal to the transmission line；
The transmission line, which provides the differential signal in the second differential signal transtation mission circuit to first difference, to be believed
Number receiving circuit, first differential signal receiving circuit provides the differential signal to described first single-ended-differential signal
The differential signal is converted to single-ended signal by change-over circuit, described first single-ended-differential signal change-over circuit, and described first is single
End-differential signal change-over circuit provides the single-ended signal to the subsystem；
The transmission line, which provides the differential signal in the first differential signal transtation mission circuit to second difference, to be believed
Number receiving circuit, second differential signal receiving circuit provides the differential signal to described second single-ended-differential signal
The differential signal is converted to single-ended signal by change-over circuit, described second single-ended-differential signal change-over circuit, and described second is single
End-differential signal change-over circuit provides the single-ended signal to the emulator.
Optionally, in described data transmission circuit, first change-over circuit also includes first voltage change-over circuit,
The voltage of differential signal in first change-over circuit is kept a high potential, described first by the first voltage change-over circuit
The voltage of single-ended signal in first change-over circuit is kept a low potential, the voltage of the high potential by voltage conversion circuit
Scope is 11V~13V, and the voltage range of the low potential is 3.0V~3.5V.
Optionally, in described data transmission circuit, second change-over circuit also includes second voltage change-over circuit,
The voltage of differential signal in second change-over circuit is kept the high potential by the second voltage change-over circuit, and described the
The voltage of single-ended signal in second change-over circuit is kept the low potential by two voltage conversion circuits.
Optionally, in described data transmission circuit, connection is passed through between first change-over circuit and the subsystem
Test job group interface is closed to carry out data transmission.
Optionally, in described data transmission circuit, connection is passed through between second change-over circuit and the emulator
Test job group interface is closed to carry out data transmission.
Optionally, in described data transmission circuit, height is passed through between first change-over circuit and the transmission line
Definition multimedia interface carries out data transmission.
Optionally, in described data transmission circuit, height is passed through between second change-over circuit and the transmission line
Definition multimedia interface carries out data transmission.
Optionally, in described data transmission circuit, the transmission line is high-definition multimedia cable.
Optionally, in described data transmission circuit, the first interface of multiple artificial circuits and described
Two interfaces are joint test working group interface.
Optionally, in described data transmission circuit, in each artificial circuit, the second interface is by data
There is provided to the first interface, the transmission line that the first interface is provided data in each artificial circuit, the biography
Defeated line provides data to the second interface.
Optionally, in described data transmission circuit, multiple second change-over circuits are fanned out to slow including a clock
Device is rushed, between multiple artificial circuits, the second change-over circuit of each artificial circuit transmits one by second interface
The clock signal that the second change-over circuit where it is received is entered row buffering by clock signal, the clock fan out buffer.
Optionally, in described data transmission circuit, the second change-over circuit of the artificial circuit of rearmost end includes a control
Signal buffer processed, the data that the control signal buffer receives the second interface of the artificial circuit of rearmost end are returned
Return.
Optionally, in described data transmission circuit, the host computer by the emulator by a sequence number provide to
Multiple artificial circuits, the emulator selects one of emulation electricity by the sequence number from multiple artificial circuits
Road carries out data transmission.
The present invention also provides a kind of data transmission method, and the data transmission method includes：In each artificial circuit
In, signal transmission, the transmission line and the described first conversion can be carried out between the subsystem and first change-over circuit
Signal transmission can be carried out between circuit and the second change-over circuit；Between multiple artificial circuits, each described emulation electricity
Signal transmission can be carried out between second change-over circuit on road, the second change-over circuit in each artificial circuit includes first
Interface and second interface, wherein：Multiple artificial circuits are arranged in order, the first interface of the latter artificial circuit
With the second interface interpolation of the previous artificial circuit, the institute of the second change-over circuit of the artificial circuit foremost
State first interface and the emulator interpolation；Can between the emulator and the second change-over circuit of artificial circuit foremost
Signal transmission is carried out, signal transmission can be carried out between the host computer and the emulator；
In each artificial circuit, first change-over circuit includes first single-ended-differential signal change-over circuit, the
One differential signal transtation mission circuit and the first differential signal receiving circuit, second change-over circuit include second single-ended-difference letter
Number change-over circuit, the second differential signal transtation mission circuit and the second differential signal receiving circuit, wherein：
Single-ended signal in the subsystem is converted to differential signal by described first single-ended-differential signal change-over circuit,
Described first single-ended-differential signal change-over circuit provides the differential signal to the first differential signal transtation mission circuit, described
One differential signal transtation mission circuit provides the differential signal to the transmission line；
Single-ended signal in the emulator is converted to differential signal by described second single-ended-differential signal change-over circuit,
Described second single-ended-differential signal change-over circuit provides the differential signal to the second differential signal transtation mission circuit, described
Two differential signal transtation mission circuits provide the differential signal to the transmission line；
The transmission line, which provides the differential signal in the second differential signal transtation mission circuit to first difference, to be believed
Number receiving circuit, first differential signal receiving circuit provides the differential signal to described first single-ended-differential signal
The differential signal is converted to single-ended signal by change-over circuit, described first single-ended-differential signal change-over circuit, and described first is single
End-differential signal change-over circuit provides the single-ended signal to the subsystem；
The transmission line, which provides the differential signal in the first differential signal transtation mission circuit to second difference, to be believed
Number receiving circuit, second differential signal receiving circuit provides the differential signal to described second single-ended-differential signal
The differential signal is converted to single-ended signal by change-over circuit, described second single-ended-differential signal change-over circuit, and described second is single
End-differential signal change-over circuit provides the single-ended signal to the emulator.
In the data transmission circuit that provides of the present invention and method, by between multiple artificial circuits, each institute
Signal transmission can be carried out between the second change-over circuit of artificial circuit by stating, the emulator and some described second change-over circuit
Between can carry out signal transmission so that can be cascaded using the similar subsystem of general jtag interface, and share an emulation
Device come complete debugging, reduce the cost of commissioning device, improve the convenience of debugging, an emulator only need to take it is upper
One interface of machine；The single-ended signal in the subsystem is converted into difference by first single-ended-differential signal change-over circuit to believe
Number, the single-ended signal in the emulator is converted to differential signal by described second single-ended-differential signal change-over circuit, is made whole
The single-ended signal of general jtag interface in data transmission circuit is converted to differential signal, to ensure that signal is not during transmission over long distances
By external disturbance, the limiting distance of the reliability of data in transmitting over long distances, effectively extension data transfer is improved.
The present invention transmits JTAG signal using Universal HDMI cable, decay and sequential during signal long-distance being transmitted
Deviation is reduced to minimum.
By the present invention in that differential signal keeps high potential, single-ended signal keeps low potential, transmits poor in HDMI transmission lines
Transimission power is improved by way of boosting there is provided the voltage to transmission line during sub-signal, so as to reduce signal transmission loss
Caused signal errors and unstable, the stability powered when being transmitted over long distances to ensure；When signal is transferred to jtag interface
It is depressured again afterwards, it is ensured that the voltage matches of jtag test interface.
In a word, the present invention realizes multiple jtag interface intensifiers by extending two symmetrical standard JTAG plugs and sockets
Cascade, the transmission range of general jtag interface is shorter, and the transmission range of general jtag interface can be extended by the present invention；Using
The similar board of general jtag interface can not be cascaded, and similar board can be cascaded by the present invention.So that general jtag interface
Signal transmission distance greatly extends, and improves the convenience that jtag interface is used.
Brief description of the drawings
Fig. 1~2 are existing data transmission circuit schematic diagrames；
Fig. 3~5 are data transmission circuit schematic diagrames of the present invention；
Shown in figure：
It is existing：
11- subsystems；111- possesses the chip under test of jtag interface；112- subsystem interfaces；12- emulators；121- is imitated
True device interface；122-USB interfaces；13- host computers；131- host computer interfaces；
21- subsystems；211- possesses the chip under test of jtag interface；22- emulators；23- host computers；
The present invention：
31- subsystems；311- possesses the chip under test of jtag interface；312- subsystem interfaces；32- emulators；321- is imitated
True device interface；The change-over circuits of 34- first；341- first is single-ended-differential signal change-over circuit；The differential signals of 342- first send electricity
Road；The differential signal receiving circuits of 343- first；344- first voltage change-over circuits；345- subsystem translation interfaces；346- first
Transmit line interface；The change-over circuits of 35- second；351- second is single-ended-differential signal change-over circuit；The differential signals of 352- second are sent
Circuit；The differential signal receiving circuits of 353- second；354- second voltage change-over circuits；355- first interfaces；356- second is transmitted
Line interface；357- second interfaces；
41- subsystems；411- possesses the chip under test of jtag interface；412- subsystem interfaces；42- emulators；421- is imitated
True device interface；The change-over circuits of 44- first；445- subsystem translation interfaces；446- first transmits line interface；45- second changes electricity
Road；455- first interfaces；456- second transmits line interface；457- second interfaces；458- clock fan out buffer；459- control letters
Number buffer；
52- emulators；521- emulator interfaces；53- host computers；The change-over circuits of 55- second；555- first interfaces；5551-
First interface input；5552- first interface output ends；556- second transmits line interface；The transmission line interface inputs of 5561- second
End；5562- second transmits line interface output end；557- second interfaces；5571- second interface inputs；557- second interfaces are defeated
Go out end.
Embodiment
Further detailed is made to data transmission circuit proposed by the present invention and method below in conjunction with the drawings and specific embodiments
Explanation.According to following explanation and claims, advantages and features of the invention will become apparent from.It should be noted that, accompanying drawing is adopted
With very simplified form and using non-accurately ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
The core concept of the present invention is to provide a kind of data transmission circuit and method to solve the shortage of host computer interface
Problem.
To realize above-mentioned thought, the invention provides a kind of data transmission circuit and method, the data transmission circuit bag
Multiple artificial circuits, an emulator and a host computer are included, wherein：Each artificial circuit includes subsystem, the first conversion
Circuit, the second change-over circuit and transmission line, in each artificial circuit, the subsystem and first change-over circuit it
Between can carry out signal transmission, signal can be carried out between the transmission line and first change-over circuit and the second change-over circuit
Transmission；Between multiple artificial circuits, signal biography can be carried out between the second change-over circuit of each artificial circuit
Defeated, the second change-over circuit in each artificial circuit includes first interface and second interface, wherein：Multiple emulation electricity
Road is arranged in order, the first interface and the second interface of the previous artificial circuit of the latter individual artificial circuit
Interpolation, the first interface of the second change-over circuit of the artificial circuit foremost and the emulator interpolation；It is described imitative
Signal transmission, the host computer and the emulation can be carried out between true device and the second change-over circuit of artificial circuit foremost
Signal transmission can be carried out between device；In each artificial circuit, first change-over circuit includes first single-ended-difference
Signaling conversion circuit, the first differential signal transtation mission circuit and the first differential signal receiving circuit, second change-over circuit include
Second single-ended-differential signal change-over circuit, the second differential signal transtation mission circuit and the second differential signal receiving circuit, wherein：Institute
State first single-ended-differential signal change-over circuit and the single-ended signal in the subsystem is converted into differential signal, described first is single
End-differential signal change-over circuit provides the differential signal to the first differential signal transtation mission circuit, first differential signal
Transtation mission circuit provides the differential signal to the transmission line；Described second single-ended-differential signal change-over circuit will be described imitative
Single-ended signal in true device is converted to differential signal, and described second single-ended-differential signal change-over circuit carries the differential signal
The second differential signal transtation mission circuit is supplied to, the second differential signal transtation mission circuit provides the differential signal to the transmission
Line；Differential signal in the second differential signal transtation mission circuit is provided to first differential signal and received by the transmission line
The differential signal is provided to described first single-ended-differential signal and changes electricity by circuit, first differential signal receiving circuit
The differential signal is converted to single-ended signal by road, described first single-ended-differential signal change-over circuit, and described first is single-ended-poor
Sub-signal change-over circuit provides the single-ended signal to the subsystem；The transmission line sends first differential signal
Differential signal in circuit is provided to second differential signal receiving circuit, and second differential signal receiving circuit will be described
Differential signal is provided to described second single-ended-differential signal change-over circuit, and described second single-ended-differential signal change-over circuit is by institute
State differential signal and be converted to single-ended signal, described second single-ended-differential signal change-over circuit provides the single-ended signal to institute
State emulator.
<Embodiment one>
As shown in figure 4, the present invention provides a kind of data transmission circuit, the data transmission circuit includes multiple emulation electricity
Road, an emulator 42 and a host computer 43, wherein：Each artificial circuit include subsystem 41, the first change-over circuit 44,
Second change-over circuit 45 and transmission line 46, in each artificial circuit, carry on subsystem 41 and multiple possess JTAG and connect
The chip under test 411 of mouth, between the subsystem 41 and first change-over circuit 44, passes through subsystem interface 412 and subsystem
System translation interface 445 interpolation realizes that signal is transmitted together, wherein, subsystem interface 412 and subsystem translation interface 445 are equal
For jtag interface；Signal is realized by the first transmission line interface 446 between the transmission line 46 and first change-over circuit 44
Realize that signal is transmitted by the second transmission line interface 456 between transmission, the change-over circuit 45 of transmission line 46 and second；Multiple
Between the artificial circuit, signal transmission can be carried out between the second change-over circuit 45 of each artificial circuit, by many
Second change-over circuit 45 of the individual artificial circuit is arranged in order, and the second change-over circuit 45 in each artificial circuit includes
First interface 455 and second interface 457, wherein：The first interface 455 of the latter artificial circuit and previous described
The interpolation of the second interface 457 of artificial circuit realizes, first of second change-over circuit 45 in each artificial circuit
Interface 455 and second interface 457 are jtag interface.The first interface of the artificial circuit foremost and the emulation
Device interpolation, signal transmission can be carried out between the emulator 42 and some described second change-over circuit 45, by foremost
The first interface 455 of second change-over circuit 45 of the artificial circuit and the emulator interface 421 in the emulator 42
Interpolation realizes that emulator interface 421 is jtag interface together.Pass through between the host computer 43 and the emulator 42
USB interface, serial ports or parallel port realize that signal is transmitted.
In the data transmission circuit that provides of the present invention and method, by between multiple artificial circuits, each institute
Signal transmission, the emulator 42 and some second conversion can be carried out between the second change-over circuit 45 for stating artificial circuit
Signal transmission can be carried out between circuit 45 so that can cascade using the similar subsystem of general jtag interface, and share one
Individual emulator 42 come complete debugging, reduce the cost of commissioning device, improve the convenience of debugging, 42 need of an emulator
Take 43 1 interfaces of host computer.
As shown in figure 3, in each artificial circuit, the artificial circuit shown in Fig. 3 is and the direct phase of emulator 32
Carried on artificial circuit in the artificial circuit of connection, i.e. Fig. 4 foremost, subsystem 31 and multiple possess the tested of jtag interface
Chip 311.First change-over circuit 34 includes first single-ended-differential signal change-over circuit 341, the first differential signal and sends electricity
The differential signal receiving circuit 343 of road 342 and first, wherein：Described first single-ended-differential signal change-over circuit 341 and subsystem
There is data transfer between translation interface 345, and subsystem interface 312 is together with the interpolation of subsystem translation interface 345, by son
Data in system 31 are transferred to first single-ended-differential signal change-over circuit 341, and subsystem interface 312 connects with subsystem conversion
Mouth 345 is joint test working group interface (jtag interface), i.e., between described first change-over circuit 34 and the subsystem 31
Carried out data transmission by jtag interface, and transmission for single-ended signal, first single-ended-differential signal change-over circuit 341 will connect
Single-ended signal in the subsystem 31 received is converted to differential signal.
Further, described first single-ended-differential signal change-over circuit 341 provides the differential signal to the first difference
Signal sending circuit 342, the first differential signal transtation mission circuit 342 provides the differential signal to the transmission line 36,
Wherein it is to be realized by the first transmission line interface 346, the first transmission line interface 346 is HDMI
(HDMI), i.e., enter line number between described first change-over circuit 34 and the transmission line 36 by HDMI
According to transmission, then data are further transferred to the second change-over circuit 35 by the transmission line 36；The transmission line 36 is high-resolution
Multimedia (HDMI) cable is spent, the present invention transmits JTAG signal using Universal HDMI cable, during signal long-distance being transmitted
Decay and timing skew be reduced to minimum.Differential signal in second change-over circuit 35 is passed through by the transmission line 36
One transmission line interface 346 is provided to first differential signal receiving circuit 343, first differential signal receiving circuit 343
The differential signal is provided to described first single-ended-differential signal change-over circuit 341, described first single-ended-differential signal turns
Change circuit 341 and the differential signal is converted into single-ended signal, described first single-ended-differential signal change-over circuit 341 will be described
Single-ended signal is provided to the subsystem 31, to realize the data transfer between subsystem 31 and transmission line 36.
In addition, in each artificial circuit, second change-over circuit 35 includes second single-ended-differential signal conversion
Circuit 351, the second differential signal transtation mission circuit 352 and the second differential signal receiving circuit 353, wherein：Described second is single-ended-poor
There is data transfer between sub-signal change-over circuit 351 and first interface 355, and first interface 355 and the interpolation of emulator interface 321
Together, the data in emulator 32 are transferred to second single-ended-differential signal change-over circuit 351, first interface 355 and imitative
True device interface 321 is jtag interface, i.e., entered between described second change-over circuit 35 and the emulator 32 by jtag interface
Row data transfer, and transmission for single-ended signal, second single-ended-differential signal change-over circuit 351 is by the emulator 32
Single-ended signal is converted to differential signal, and described second single-ended-differential signal change-over circuit 351 provides the differential signal to
Two differential signal transtation mission circuits 352, the second differential signal transtation mission circuit 352 will be described by the second transmission line interface 356
Differential signal is provided to the transmission line 36；The transmission line 36 is electric by the described first conversion by the second transmission line interface 356
Differential signal in road 34 is provided to second differential signal receiving circuit 353, and the second transmission line interface 356 connects for HDMI
Mouthful, i.e., carried out data transmission between described second change-over circuit 35 and the transmission line 36 by HDMI,
Second differential signal receiving circuit 353 provides the differential signal to described second single-ended-differential signal change-over circuit
351, the differential signal is converted to single-ended signal by described second single-ended-differential signal change-over circuit 351, and described second is single
End-differential signal change-over circuit 351 provides the single-ended signal to the emulator 32, to realize emulator 32 and transmission line
Data transfer between 36.Described first single-ended-differential signal change-over circuit and the second single-ended-differential signal change-over circuit
The electrical level transferring chip including ISF0204 etc., the first differential signal transtation mission circuit and second differential signal send electricity
Road includes the distribution of DS90IV011A equal difference and send chip, and first differential signal receiving circuit and second differential signal connect
Receive circuit differential received chip including DS90IV012A etc..
The present invention is changed the single-ended signal in the subsystem 31 by first single-ended-differential signal change-over circuit 341
For differential signal, the single-ended signal in the emulator 32 is converted to difference by described second single-ended-differential signal change-over circuit 351
Sub-signal, makes the single-ended signal of the general jtag interface in whole data transmission circuit be converted to differential signal, come ensure it is long away from
Signal improves the limitation of the reliability of data in transmitting over long distances, effectively extension data transfer not by external disturbance during from transmission
Distance.
Specifically, in described data transmission circuit, first change-over circuit 34 also includes first voltage and changes electricity
The voltage of differential signal in first change-over circuit 34 is kept a high electricity by road 344, the first voltage change-over circuit 344
The voltage of single-ended signal in first change-over circuit 34 is kept a low potential by position, the first voltage change-over circuit 344.
Second change-over circuit 35 also includes second voltage change-over circuit 354, and the second voltage change-over circuit 354 is by described second
The voltage of differential signal in change-over circuit 35 keeps the high potential, and the second voltage change-over circuit 354 is by described second
The voltage of single-ended signal in change-over circuit 35 keeps the low potential.Wherein：The voltage range of the high potential be 11V~
13V, the voltage range of the low potential is 3.0V~3.5V.
By the present invention in that differential signal keeps high potential, single-ended signal keeps low potential, transmits poor in HDMI transmission lines
Transimission power is improved by way of boosting there is provided the voltage to transmission line during sub-signal, so as to reduce signal transmission loss
Caused signal errors and unstable, the stability powered when being transmitted over long distances to ensure；When signal is transferred to jtag interface
It is depressured again afterwards, it is ensured that the voltage matches of jtag test interface.
In addition, the second change-over circuit 35 also has second interface 357, for the second change-over circuit with other artificial circuits
First interface interpolation together, do not illustrate the second change-over circuit of other artificial circuits in Fig. 3 specifically.
As shown in figure 5, in described data transmission circuit, the first interface of multiple artificial circuits and described
Second interface is joint test working group interface, therefore in each artificial circuit, the second interface 557 can be straight
Connect and provide data to the first interface 555, i.e. second interface output end 5572 and be directly connected to first interface output end 5552,
Then data are transferred to emulator 52 by first interface by emulator interface 521, and then are further transferred to host computer 53, this
Individual process realizes subsystem and transmits data to host computer 53.
Further, the second transmission line that the first interface 555 is provided data in each artificial circuit connects
Line interface input 5561 is transmitted in mouth 556, the connection of first interface input 5,551 second, and second transmits line interface 556 by data
Transmission line is issued, and has transmission line further to issue the first change-over circuit, and subsystem, to realize host computer 53 to subsystem
Transmit data.And the data for thering is subsystem to return, by the second transmission line interface 556, provide data to the second interface
557, specifically, the second transmission line interface output end 5562 connects second interface input 5571, second interface input 5571
Then data winding is directly directly issued into first interface output end 5552, to realize subsystem to second interface output end 5572
Both the data transfer united to host computer, by first interface 555 together with the interpolation of second interface 557, and connect for JTAG
Mouthful, very easily realize the cascade of multiple artificial circuits, first interface 555 and the transmission line interface of second interface 557 and second
Data transfer between 556 needs the signal conversion by second single-ended-differential signal change-over circuit.
As shown in figure 4, multiple second change-over circuits 45 include a clock fan out buffer 458, multiple described
Between artificial circuit, the second change-over circuit 45 of each artificial circuit transmits a clock signal, institute by second interface 457
State clock fan out buffer 458 and the clock signal that the second change-over circuit 45 where it is received is entered into row buffering, so that many
The individual same clock signal of artificial circuit share, realizes that transmission is synchronous.Second conversion electricity of the artificial circuit of the rearmost end
Road 45 includes all having control signal buffer 459 in a control signal buffer 459, Fig. 4 in each second change-over circuit, with
The difference between artificial circuit need not be distinguished when just using, the control signal buffer 459 makes the emulation electricity of rearmost end
The data that the second interface 457 on road is received are returned, i.e. the data of the input of second interface 457 are transmitted directly to second interface 457
Output end.
In addition, in described data transmission circuit, the host computer 43 is provided a sequence number by the emulator 42
To multiple artificial circuits, the emulator 42 selects one of them to imitate by the sequence number from multiple artificial circuits
True circuit carries out data transmission.
To sum up, the various configuration of data transmission circuit is described in detail above-described embodiment, certainly, and the present invention includes
But configuration cited in above-mentioned implementation is not limited to, it is any to enter on the basis of the configuration that above-described embodiment is provided in line translation
Hold, belong to the scope that the present invention is protected.Those skilled in the art can draw inferences about other cases from one instance according to the content of above-described embodiment.
<Embodiment two>
The present invention also provides a kind of data transmission method, and the data transmission method includes：As shown in figure 4, in each institute
State in artificial circuit, there is signal transmission, the transmission line 46 and institute between the subsystem 41 and first change-over circuit 44
Stating between the first change-over circuit 44 and the second change-over circuit 45 has signal transmission；Between multiple artificial circuits, each institute
Have signal transmission between the second change-over circuit 45 for stating artificial circuit, the emulator and some described second change-over circuit 45 it
Between have signal transmission, have signal transmission between the host computer 43 and the emulator 42.
Specifically, described first single-ended-differential signal change-over circuit 441 changes the single-ended signal in the subsystem 41
For differential signal, the differential signal is provided to the first differential signal and sent out by described first single-ended-differential signal change-over circuit 441
Power transmission road 442, the first differential signal transtation mission circuit 442 provides the differential signal to the transmission line 46；It is described to pass
Defeated line 46 provides the differential signal in second change-over circuit 45 to first differential signal receiving circuit 443, described
First differential signal receiving circuit 443 provides the differential signal to described first single-ended-differential signal change-over circuit 441,
The differential signal is converted to single-ended signal by described first single-ended-differential signal change-over circuit 441, and described first is single-ended-poor
Sub-signal change-over circuit 441 provides the single-ended signal to the subsystem 41.
Further, described second single-ended-differential signal change-over circuit 451 turns the single-ended signal in the emulator 42
Differential signal is changed to, described second single-ended-differential signal change-over circuit 451 provides the differential signal to the second differential signal
Transtation mission circuit 452, the second differential signal transtation mission circuit 452 provides the differential signal to the transmission line 46；It is described
Transmission line 46 provides the differential signal in first change-over circuit 44 to second differential signal receiving circuit 453, institute
The second differential signal receiving circuit 453 is stated to provide the differential signal to described second single-ended-differential signal change-over circuit
451, the differential signal is converted to single-ended signal by described second single-ended-differential signal change-over circuit 451, and described second is single
End-differential signal change-over circuit 451 provides the single-ended signal to the emulator 42.
In addition, as shown in figure 5, the first interface and the second interface of multiple artificial circuits are joint survey
Group interface is made in trial work, therefore in each artificial circuit, the second interface 557 can directly provide data to described
First interface 555, i.e. second interface output end 5572 are directly connected to first interface output end 5552, and then first interface is by data
Emulator 52 is transferred to by emulator interface 521, and then is further transferred to host computer 53, this process realizes subsystem
Data are transmitted to host computer 53.
Further, the second transmission line that the first interface 555 is provided data in each artificial circuit connects
Line interface input 5561 is transmitted in mouth 556, the connection of first interface input 5,551 second, and second transmits line interface 556 by data
Transmission line is issued, and has transmission line further to issue the first change-over circuit, and subsystem, to realize host computer 53 to subsystem
Transmit data.And the data for thering is subsystem to return, by the second transmission line interface 556, provide data to the second interface
557, specifically, the second transmission line interface output end 5562 connects second interface input 5571, second interface input 5571
Then data winding is directly directly issued into first interface output end 5552, to realize subsystem to second interface output end 5572
Both the data transfer united to host computer, by first interface 555 together with the interpolation of second interface 557, and connect for JTAG
Mouthful, very easily realize the cascade of multiple artificial circuits, first interface 555 and the transmission line interface of second interface 557 and second
Data transfer between 556 needs the signal conversion by second single-ended-differential signal change-over circuit.
The present invention is real by extending two symmetrical standard JTAG plugs and sockets, i.e. first interface 455 and second interface 456
Existing multiple jtag interface intensifier cascades, the transmission range of general jtag interface is shorter, can extend general by the present invention
The transmission range of jtag interface；It can not be cascaded, can be cascaded by the present invention similar using the similar board of general jtag interface
Board.So that the signal transmission distance of general jtag interface greatly extends, the convenience that jtag interface is used is improved.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, due to corresponding to the method disclosed in Example, so description is fairly simple, related part is referring to method part illustration
.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Scope.
Claims (14)
1. a kind of data transmission circuit, it is characterised in that the data transmission circuit include multiple artificial circuits, an emulator and
One host computer, wherein：
Each artificial circuit includes subsystem, the first change-over circuit, the second change-over circuit and transmission line, each described
In artificial circuit, signal transmission can be carried out between the subsystem and first change-over circuit, the transmission line with it is described
Signal transmission can be carried out between first change-over circuit and the second change-over circuit；Between multiple artificial circuits, each institute
Signal transmission can be carried out between the second change-over circuit of artificial circuit by stating, the second change-over circuit in each artificial circuit
Including first interface and second interface, wherein：Multiple artificial circuits are arranged in order, the latter artificial circuit it is described
The second interface interpolation of first interface and the previous artificial circuit, the second conversion of the artificial circuit foremost
The first interface of circuit and the emulator interpolation；Second change-over circuit of the emulator and artificial circuit foremost
Between can carry out signal transmission, signal transmission can be carried out between the host computer and the emulator；
In each artificial circuit, first change-over circuit includes first single-ended-differential signal change-over circuit, first poor
Sub-signal transtation mission circuit and the first differential signal receiving circuit, second change-over circuit turn including second single-ended-differential signal
Circuit, the second differential signal transtation mission circuit and the second differential signal receiving circuit are changed, wherein：
Single-ended signal in the subsystem is converted to differential signal by described first single-ended-differential signal change-over circuit, described
The differential signal is provided poor to the first differential signal transtation mission circuit, described first by first single-ended-differential signal change-over circuit
Sub-signal transtation mission circuit provides the differential signal to the transmission line；
Single-ended signal in the emulator is converted to differential signal by described second single-ended-differential signal change-over circuit, described
The differential signal is provided poor to the second differential signal transtation mission circuit, described second by second single-ended-differential signal change-over circuit
Sub-signal transtation mission circuit provides the differential signal to the transmission line；
Differential signal in the second differential signal transtation mission circuit is provided to first differential signal and connect by the transmission line
Circuit is received, the differential signal is provided to described first single-ended-differential signal and changed by first differential signal receiving circuit
The differential signal is converted to single-ended signal by circuit, described first single-ended-differential signal change-over circuit, described first single-ended-
Differential signal change-over circuit provides the single-ended signal to the subsystem；
Differential signal in the first differential signal transtation mission circuit is provided to second differential signal and connect by the transmission line
Circuit is received, the differential signal is provided to described second single-ended-differential signal and changed by second differential signal receiving circuit
The differential signal is converted to single-ended signal by circuit, described second single-ended-differential signal change-over circuit, described second single-ended-
Differential signal change-over circuit provides the single-ended signal to the emulator.
2. data transmission circuit as claimed in claim 1, it is characterised in that first change-over circuit also includes first voltage
The voltage of differential signal in first change-over circuit is kept a high electricity by change-over circuit, the first voltage change-over circuit
The voltage of single-ended signal in first change-over circuit is kept a low potential by position, the first voltage change-over circuit, described
The voltage range of high potential is 11V~13V, and the voltage range of the low potential is 3.0V~3.5V.
3. data transmission circuit as claimed in claim 2, it is characterised in that second change-over circuit also includes second voltage
The voltage of differential signal in second change-over circuit is kept the high electricity by change-over circuit, the second voltage change-over circuit
The voltage of single-ended signal in second change-over circuit is kept the low potential by position, the second voltage change-over circuit.
4. data transmission circuit as claimed in claim 1, it is characterised in that first change-over circuit and the subsystem it
Between carried out data transmission by joint test working group interface.
5. data transmission circuit as claimed in claim 1, it is characterised in that second change-over circuit and the emulator it
Between carried out data transmission by joint test working group interface.
6. data transmission circuit as claimed in claim 1, it is characterised in that first change-over circuit and the transmission line it
Between carried out data transmission by HDMI.
7. data transmission circuit as claimed in claim 1, it is characterised in that second change-over circuit and the transmission line it
Between carried out data transmission by HDMI.
8. data transmission circuit as claimed in claim 1, it is characterised in that the transmission line is high-definition multimedia line
Cable.
9. data transmission circuit as claimed in claim 1, it is characterised in that the first interface of multiple artificial circuits
It is joint test working group interface with the second interface.
10. data transmission circuit as claimed in claim 1, it is characterised in that in each artificial circuit, described second
Interface provides data to the first interface, the transmission that the first interface is provided data in each artificial circuit
Line, the transmission line provides data to the second interface.
11. data transmission circuit as claimed in claim 1, it is characterised in that multiple second change-over circuits include one
Clock fan out buffer, between multiple artificial circuits, the second change-over circuit of each artificial circuit passes through second
Interface transmits a clock signal, the clock signal that the clock fan out buffer receives the second change-over circuit where it
Enter row buffering.
12. data transmission circuit as claimed in claim 1, it is characterised in that the second conversion electricity of the artificial circuit of rearmost end
Road includes a control signal buffer, and the control signal buffer receives the second interface of the artificial circuit of rearmost end
Data return.
13. data transmission circuit as claimed in claim 1, it is characterised in that the host computer is by the emulator by one
Sequence number is provided to multiple artificial circuits, and the emulator is selected wherein by the sequence number from multiple artificial circuits
One artificial circuit carries out data transmission.
14. a kind of data transmission method, it is characterised in that the data transmission method includes：In each artificial circuit,
Signal transmission, the transmission line and first change-over circuit can be carried out between the subsystem and first change-over circuit
And second can carry out signal transmission between change-over circuit；Between multiple artificial circuits, each artificial circuit
Signal transmission can be carried out between second change-over circuit, the second change-over circuit in each artificial circuit includes first interface
And second interface, wherein：Multiple artificial circuits are arranged in order, and the first interface of the latter artificial circuit is with before
The second interface interpolation of one artificial circuit, described the of the second change-over circuit of the artificial circuit foremost
One interface and the emulator interpolation；It can be carried out between the emulator and the second change-over circuit of artificial circuit foremost
Signal is transmitted, and signal transmission can be carried out between the host computer and the emulator；
In each artificial circuit, first change-over circuit includes first single-ended-differential signal change-over circuit, first poor
Sub-signal transtation mission circuit and the first differential signal receiving circuit, second change-over circuit turn including second single-ended-differential signal
Circuit, the second differential signal transtation mission circuit and the second differential signal receiving circuit are changed, wherein：
Single-ended signal in the subsystem is converted to differential signal by described first single-ended-differential signal change-over circuit, described
The differential signal is provided poor to the first differential signal transtation mission circuit, described first by first single-ended-differential signal change-over circuit
Sub-signal transtation mission circuit provides the differential signal to the transmission line；
Single-ended signal in the emulator is converted to differential signal by described second single-ended-differential signal change-over circuit, described
The differential signal is provided poor to the second differential signal transtation mission circuit, described second by second single-ended-differential signal change-over circuit
Sub-signal transtation mission circuit provides the differential signal to the transmission line；
Differential signal in the second differential signal transtation mission circuit is provided to first differential signal and connect by the transmission line
Circuit is received, the differential signal is provided to described first single-ended-differential signal and changed by first differential signal receiving circuit
The differential signal is converted to single-ended signal by circuit, described first single-ended-differential signal change-over circuit, described first single-ended-
Differential signal change-over circuit provides the single-ended signal to the subsystem；
Differential signal in the first differential signal transtation mission circuit is provided to second differential signal and connect by the transmission line
Circuit is received, the differential signal is provided to described second single-ended-differential signal and changed by second differential signal receiving circuit
The differential signal is converted to single-ended signal by circuit, described second single-ended-differential signal change-over circuit, described second single-ended-
Differential signal change-over circuit provides the single-ended signal to the emulator.
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| CN201710406015.1A CN107256194B (en) | 2017-06-01 | 2017-06-01 | Data transmission circuit and method |
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| CN110504991A (en) * | 2019-09-18 | 2019-11-26 | 北京中科格励微科技有限公司 | Contactless electric connector |
| CN111352657A (en) * | 2018-12-21 | 2020-06-30 | 上海都森电子科技有限公司 | Method for reading x86 data by FPGA high-speed and high-efficiency running water |
| CN112004044A (en) * | 2020-09-02 | 2020-11-27 | 深圳市研盛芯控电子技术有限公司 | Digital-analog signal conversion integrated circuit |
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| CN107256194B (en) | 2020-05-08 |
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Denomination of invention: Data transmission circuit and method Effective date of registration: 20211227 Granted publication date: 20200508 Pledgee: Industrial and Commercial Bank of China Limited Shanghai Hongkou sub branch Pledgor: SHANGHAI DUSEN ELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2021310000164 |
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Denomination of invention: Data transmission circuit and method Granted publication date: 20200508 Pledgee: Agricultural Bank of China Limited Shanghai Changning Branch Pledgor: SHANGHAI DUSEN ELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2024980030128 |
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