CN106374909A - I/O port circuit structure with hot plug function - Google Patents
I/O port circuit structure with hot plug function Download PDFInfo
- Publication number
- CN106374909A CN106374909A CN201610833266.3A CN201610833266A CN106374909A CN 106374909 A CN106374909 A CN 106374909A CN 201610833266 A CN201610833266 A CN 201610833266A CN 106374909 A CN106374909 A CN 106374909A
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- module
- hot plug
- input
- port
- output
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018507—Interface arrangements
Abstract
The invention relates to an I/O port circuit structure with a hot plug function. The structure comprises an output buffer module, an input buffer module, a hot plug module and an ESD protection module, wherein the output buffer module is connected to a PAD end, an input signal and an input-output selection control end and is used for realizing a function of taking a port PAD as an output end; the input buffer module is connected to the PAD end and an output signal and is used for realizing a function of taking the port PAD as an input end; the hot plug module is connected to the PAD end through a resistor and is used for realizing hot plug; and the ESD protection module is connected to the PAD end and is used for realizing ESD protection of 2000 V. Through adding the hot plug circuit structure based on the conventional I/O port structure, the hot plug function of the device port is realized; and furthermore, the hot plug function is guaranteed while the structure has ESD resistance of 2000 V.
Description
Technical field
The present invention relates to a kind of hot connecting and disconnecting line structure, especially a kind of i/o port circuit structure with warm connection function.
Background technology
Hot plug represents a system in the case that input, outfan and signal bus are all in working condition, plus
Load or the ability of removal power supply.Hot plug can be used to the response controlling the circuit-board card being not powered on to be powered up with management system,
Make mainboard and plug-in card injury-free.
When the circuit-board card system powered with is connected, because board is joltily to be injected adapter, board with electricity
The connection in source will appear from multiple break-make.Board and adapter are adapted to the time needing to spend several milliseconds completely.When board is inserted
When entering, the electric capacity on board begins to charge, and absorbs electric current from electrified system.During electric capacity initial charge, board shows as
Short circuit and absorb substantial amounts of electric current immediately.Inflow current produces big demand to system, be likely to result in system capacitance electric discharge and
System voltage declines.Hot plug can ensure that in pc base plate, cable or inserts from main system module and remove board, without
Want deenergization.In order to improve the efficiency of system, hot plug is used to reduce power-off time, and simplified system is repaired and allowed system
Upgrading.Based on these advantages, the application of hot plug is very wide.
The application that hot plug is related to includes telecommunication system, service, raid, hot plug pci, usb etc..Using hot plug
Technology allows user to be upgraded, extended and repaired in the case of the remainder not affecting system.If fully achieved, heat
Plug ic realizes technology and just can generate a highly reliable, efficient system.
Carry out Curve guide impeller from the i/o port level of hardware circuit, be designed to a kind of port with warm connection function knot
Structure can realize warm connection function from source, and then protection circuit board is without damage.
Content of the invention
When the technical problem to be solved in the present invention is that an electrified system is inserted or pull out another electrified system, system
Port is not in big drain conditions and has anti-2000vesd ability simultaneously, therefore provides a kind of i/ with warm connection function
O port circuit structure.In order that this i/o port is in addition to meeting basic signal input output function, also need possess other two
Plant specific function, increased the following two kinds structure in design: one, port to be made can suppress the generation of high current, the present invention exists
Hot plug module is increased in the design of port.2nd, port to be made is resistant to 2000vesd, and the present invention increased on port is designed
Esd protection circuit module.In some cases, esd protection circuit module is with hot plug module and incompatible, is ensureing hot plug work(
Can effectively while, esd protection module can lose efficacy, this just to port design increased certain difficulty.
In order to realize two kinds of specific functions of port, and solve the problems, such as two kinds of function conflicts, the invention provides as follows
Technical scheme:
A kind of i/o port circuit structure with warm connection function of the present invention, including output buffer module, input buffering mould
Block, also includes hot plug module, esd protection module, and output buffer module connects pad end and input signal, input and output select
Control end, is used for realizing port pad as outfan；Input buffer module connects pad end and output signal, is used for realizing port
Pad is as input；Hot plug module connects pad end by resistance, is used for realizing hot plug；Esd protection module connects pad
End, the esd for realizing 2000v protects.
Further, output buffer structure module includes selecting the gate leve structure controlling and for defeated for input and output
Go out pull-up mp pipe, the drop-down mn pipe of buffering；In output buffer structure module, the substrate of all mp pipes is not directly to connect power end,
But the offset side p that in connection hot plug module, automatic biasing diode produces.
Further, input buffer structure module includes a v for adjusting portih、vilThe schmidt trigger of parameter
Device and a phase inverter being used for input buffering；In input buffer structure module, the substrate of all mp pipes is not directly to connect power supply
End, but connect the offset side p that in hot plug module, automatic biasing diode produces.
Further, hot plug module includes the mp pipe of two grounded-grids, two grids connect the mp pipe of power supply, grid
Pole connects the mp pipe at pad end and a grid is selected the mp that end controls to manage by input and output；All mp pipes in hot plug module
Substrate does not all access power end, and its underlayer voltage is all by the mp management and control system of two grounded-grids.This design can prevent device from existing
Produce high current in swapping process, realize warm connection function.
Further, esd protection module includes the grid-control diode being connected with ground terminal and resistance；Esd protection module is right
Using a pseudo- power supply esd-bus structure released for leak channel in the layout design answered.
The present invention adopts above technical scheme compared with prior art, has following technical effect that
1st, in the swapping process of device, the input signal of port still suffers from, but supply voltage can change so that passing
I/o port under system structure produces ultrahigh current, and device will be led to when serious to burn out.And the present invention passes through at traditional i/o end
Increase hot plug module on the basis of mouth circuit structure it is achieved that the warm connection function of device interface, change in supply voltage
During change, underlayer voltage will not change with supply voltage, but follows pad signal intensity, thus having cut off parasitic diode
Leakage path, does not have the generation of high current.
2nd, the present invention passes through to increase esd protection module on the basis of traditional i/o port circuit structure, is ensureing that heat is slotting
Pull out the anti-esd ability also while functional realiey with 2000v.Compared with traditional esd protection module structure, this module is removed
The gate control diode partial circuit that is connected with power end, in order to not affect the protective capacities of esd, this port is corresponding on domain
Special process has been done at place, increased a pseudo- power supply esd-bus structure, so that leak channel is released by pseudo- power supply.
Brief description
Fig. 1 is the port circuit structure chart of the present invention；
Fig. 2 is present invention output buffer module structure chart；
Fig. 3 is present invention input buffer module structure chart；
Fig. 4 is present invention input, the leak channel schematic diagram of output buffer module.
Specific embodiment
Below in conjunction with the accompanying drawings technical scheme is described in further detail:
As shown in figure 1, a kind of i/o port circuit structure with warm connection function, including four main modules, it is respectively
Output buffer module 1, input buffer module 2, hot plug module 3, esd protection module 4.Output buffer module 1 connect pad end and
Input signal, input and output select control end, for realizing port pad as the function of outfan；Input buffer module 2 connects
Pad end and output signal, for realizing port pad as the function of input；Hot plug module 3 passes through a resistance with pad end
It is connected, for realizing plug function；Esd protection module 4 is connected with pad end, for realizing the esd protective capacities of 2000v.
Output buffer module 1 in this structure selects control signal end as shown in Fig. 2 wherein a1 is input and output, and a2 is
Input data signal end, i1, i2, i5, i6 are not gates, and i3 is OR gate, and i4 is and door.Analysis Fig. 2 understands, as a1=0, OR gate
And all effective with door, input data signal a2 delivers to output buffer through gate leve transmission, and as a1=1, the output of OR gate i3 is permanent
It is set to 0, constant with the output of door i4 is 1, the upper trombone slide mp7 in output buffer and lower trombone slide mn1 are in cut-off state, this
When a2 signal will not be input to pad port, i/o realizes the input function of port.The present invention by all doors mp manage and
The substrate of the pull-up mp7 pipe in output buffer is connected to the bias voltage p end produce in hot-plug construction 3, has cut off device
Parasitic diode leak channel in swapping process., if the substrate connection of mp7 pipe is power supply vdd end taking mp7 pipe as a example,
So in hot plug process, vdd is reduced to 0v, when pad is positive voltage, mp7 pipe will appear from leak channel as shown in Figure 4.
Input buffer module 2 in this structure is as shown in Figure 3.Wherein pad end is connected to Schmidt trigger by resistance r2
Input port, the signal at pad end exports out port through one-level phase inverter after Schmidt trigger again, and Schmidt touches
Send out device to be made up of mp8 pipe, mp9 pipe, mp10 pipe, mn2 pipe, mn3 pipe, mn4 pipe, phase inverter is made up of mp11 pipe, mn5.Here apply
Schmitt trigger is mainly used in adjusting the v of i/o portih、vilParameter size, simultaneously the substrate of all of mp pipe all linked p
End, p terminal voltage follows pad terminal voltage, so in device hot plug process, the fluctuation of power supply end signal will not produce to p end
Big impact, the pressure drop very little at parasitic diode two ends, it is not result in that diode is opened, thus inhibiting the generation of high current.
Hot plug module 3 in this structure is shown in Fig. 1, the mp2 including resistance r1, two grounded-grid gnd manages and mp3 manages,
Two grids connect the mp5 pipe of power supply vdd and mp6 pipe, grid passes through resistance r4 and meet the mp1 at pad end to manage and a grid
The mp4 that end controls is selected to manage by input and output.The substrate of all mp pipes does not all access power end, and its underlayer voltage is all by mp2
Pipe, mp3 management and control system.The operation principle realizing hot plug is the use of the structure of n trap (p end) suspension joint.The n trap of all mp pipes does not have
It is directly connected to power supply vdd end, but n trap potential is supplied to by mp pipe.The present invention is added to n trap using mp2 pipe and mp3 pipe
Electricity, provides bias voltage.When hot plug, vdd voltage is reduced to 0v so that mp5 and mp6 pipe is opened, and pad port is positive voltage,
Power up to n trap now by mp2, mp3, mp5 and mp6 pipe, n trap voltage follows pad terminal voltage all the time.Another one design tactics
That the grid b end of mp1 pipe is connected to pad end through resistance r4, and the purpose of so design is: during (1) hot plug, vdd voltage by
3.3v is reduced to 0v, and now pad high voltage can turn off mp1, if grid is not connected to pad and is grounded, then channel leakage.(2)
During normal work, if pad is high level, mp1 tube grid connects pad, and this pipe turns off, and relies primarily on pn-junction to n trap, i.e. p
End powers up, and is powered by pn-junction, can make n trap (p end) voltage close to vdd.If pad is low level, the grid of mp1 pipe is also
Low level, pipe is opened, and powers up to n trap (p end), maintains normal work.
Esd protection module 4 in this structure is shown in Fig. 1.This module by three gate control diode n1 being connected with ground terminal, n2,
N3 and resistance r3 composition.In traditional esd protection module pad to the leak channel of power supply as shown in figure 4, with traditional grid-control
The esd protection module of diode is compared, and only remains the gate control diode to ground terminal, eliminate to power supply unit in this modular structure
The gate control diode dividing.This modular structure makes device in hot plug process, when the voltage on power supply suddenly drops to 0v,
Pad is cut off to the leak channel of power supply, maintains warm connection function.But for esd, the electric leakage of Shao Liao mono- tunnel is released logical
Road, the therefore present invention, in corresponding layout design, increased a pseudo- power supply esd-bus structure, make leak channel pass through puppet
Power supply is released, and both ensure that the warm connection function of port, also ensure that the protective capability of esd.
Embodiment cited by the present invention, is only intended to help and understands the present invention, should not be construed as protecting model to the present invention
The restriction enclosed, for those skilled in the art, without departing from the inventive concept of the premise, can also be right
The present invention makes improvements and modifications, and these improve and modification also falls in the range of the claims in the present invention protection.
Claims (5)
1. a kind of i/o port circuit structure with warm connection function, including output buffer module (1), input buffer module (2),
It is characterized in that: also include hot plug module (3), esd protection module (4), described output buffer module (1) connect pad end and
Input signal, input and output select control end, are used for realizing port pad as outfan；Described input buffer module (2) connects
Pad end and output signal, are used for realizing port pad as input；Described hot plug module (3) connects pad end by resistance,
For realizing hot plug；Described esd protection module (4) connects pad end, and the esd for realizing 2000v protects.
2. the i/o port circuit structure with warm connection function according to claim 1 it is characterised in that: described output is slow
Rush construction module (1) include for input and output select control gate leve structure and for output buffering pull-up mp pipe, under
Mn is drawn to manage；In output buffer structure module (1), the substrate of all mp pipes connects automatic biasing diode in hot plug module (3) and produces
Offset side p.
3. the i/o port circuit structure with warm connection function according to claim 1 it is characterised in that: described input is slow
Rush construction module (2) and include a v for adjusting portih、vilThe Schmidt trigger of parameter and one are used for input buffering
Phase inverter；In input buffer structure module (2), the substrate of all mp pipes connects automatic biasing diode in hot plug module (3) and produces
Raw offset side p.
4. the i/o port circuit structure with warm connection function according to claim 1 it is characterised in that: described hot plug
The mp pipe of module (3) include two grounded-grids, two grids connect the mp pipe of power supply, grid connect pad end mp pipe and
One grid is selected the mp that end controls to manage by input and output；In hot plug module (3), the underlayer voltage of all mp pipes is all by two
The mp management and control system of grounded-grid.
5. the i/o port circuit structure with warm connection function according to claim 1 it is characterised in that: described esd protection
Module (4) includes the grid-control diode being connected with ground terminal and resistance；Esd protection module (4) adopts in corresponding layout design
One pseudo- power supply esd-bus structure released for leak channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610833266.3A CN106374909B (en) | 2016-09-19 | 2016-09-19 | A kind of I/O port circuit structure with warm connection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610833266.3A CN106374909B (en) | 2016-09-19 | 2016-09-19 | A kind of I/O port circuit structure with warm connection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106374909A true CN106374909A (en) | 2017-02-01 |
| CN106374909B CN106374909B (en) | 2019-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610833266.3A Active CN106374909B (en) | 2016-09-19 | 2016-09-19 | A kind of I/O port circuit structure with warm connection function |
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| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107005046A (en) * | 2015-07-31 | 2017-08-01 | 京微雅格（北京）科技有限公司 | A kind of hot plug protection circuit |
| CN107515371A (en) * | 2017-09-29 | 2017-12-26 | 武汉华海通用电气有限公司 | A kind of hot-swappable test fixture circuit |
| CN114006614A (en) * | 2021-11-03 | 2022-02-01 | 中国电子科技集团公司第五十八研究所 | Hot plug structure based on NMOS pull-up driver |
| CN114625685A (en) * | 2022-03-01 | 2022-06-14 | 厦门智多晶科技有限公司 | IO circuit with hot plug function, chip and power supply control method of IO circuit |
| CN114826248A (en) * | 2022-05-05 | 2022-07-29 | 中国电子科技集团公司第五十八研究所 | Hot plug structure of driver messenger ability |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060018064A1 (en) * | 2004-07-22 | 2006-01-26 | Taiwan Semiconductor Manufacturing Co., Ltd. | High voltage tolerant I/O circuit |
| CN205105319U (en) * | 2015-10-20 | 2016-03-23 | 重庆惠科金扬科技有限公司 | HDMI interface circuit |
| CN105528322A (en) * | 2015-09-01 | 2016-04-27 | 北京中电华大电子设计有限责任公司 | A hot-swapping-preventing drive-selectable output drive circuit |
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2016
- 2016-09-19 CN CN201610833266.3A patent/CN106374909B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060018064A1 (en) * | 2004-07-22 | 2006-01-26 | Taiwan Semiconductor Manufacturing Co., Ltd. | High voltage tolerant I/O circuit |
| CN105528322A (en) * | 2015-09-01 | 2016-04-27 | 北京中电华大电子设计有限责任公司 | A hot-swapping-preventing drive-selectable output drive circuit |
| CN205105319U (en) * | 2015-10-20 | 2016-03-23 | 重庆惠科金扬科技有限公司 | HDMI interface circuit |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107005046A (en) * | 2015-07-31 | 2017-08-01 | 京微雅格（北京）科技有限公司 | A kind of hot plug protection circuit |
| CN107005046B (en) * | 2015-07-31 | 2019-03-08 | 京微雅格（北京）科技有限公司 | A kind of hot plug protection circuit |
| CN107515371A (en) * | 2017-09-29 | 2017-12-26 | 武汉华海通用电气有限公司 | A kind of hot-swappable test fixture circuit |
| CN114006614A (en) * | 2021-11-03 | 2022-02-01 | 中国电子科技集团公司第五十八研究所 | Hot plug structure based on NMOS pull-up driver |
| CN114006614B (en) * | 2021-11-03 | 2023-08-15 | 中国电子科技集团公司第五十八研究所 | Hot plug structure based on NMOS pull-up driver |
| CN114625685A (en) * | 2022-03-01 | 2022-06-14 | 厦门智多晶科技有限公司 | IO circuit with hot plug function, chip and power supply control method of IO circuit |
| CN114625685B (en) * | 2022-03-01 | 2023-04-18 | 厦门智多晶科技有限公司 | IO circuit with hot plug function, chip and power supply control method of IO circuit |
| CN114826248A (en) * | 2022-05-05 | 2022-07-29 | 中国电子科技集团公司第五十八研究所 | Hot plug structure of driver messenger ability |
| CN114826248B (en) * | 2022-05-05 | 2023-07-07 | 中国电子科技集团公司第五十八研究所 | Driver enabled hot plug structure |
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| Publication number | Publication date |
|---|---|
| CN106374909B (en) | 2019-06-04 |
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