CN205721216U - A kind of control the control circuit of service card iic bus buffer in card insert type equipment - Google Patents
A kind of control the control circuit of service card iic bus buffer in card insert type equipment Download PDFInfo
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- CN205721216U CN205721216U CN201620362987.6U CN201620362987U CN205721216U CN 205721216 U CN205721216 U CN 205721216U CN 201620362987 U CN201620362987 U CN 201620362987U CN 205721216 U CN205721216 U CN 205721216U
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- iic
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Abstract
This utility model relates to communication technique field, especially relates to a kind of control the control circuit of service card iic bus buffer in card insert type equipment.The problem that this utility model exists for prior art, a kind of control circuit is provided, what solution tradition occurred when directly controlling IIC buffer by service card central processing unit opens IIC buffer the situation of the service card central processing unit communication interfering with main control card central processing unit and normal work owing to central processing unit breaks down by mistake, determine when frequently also without software simultaneously and open or close IIC buffer, greatly reduce the difficulty of software design.The IIC signal output of iic bus buffer described in this utility model is by back panel connector to the IIC interface of main control card central processing unit, after the square-wave signal that central processing unit on service card exports is converted into low and high level signal by watchdog circuit, it is sent to iic bus buffer.
Description
Technical field
This utility model relates to communication technique field, especially relates to a kind of control the control circuit of service card iic bus buffer in card insert type equipment.
Background technology
At communication technique field used card insert type equipment, main control card central processing unit and service card central processing unit frequently by the interface of this 2 lines of IIC carry out simple communication, owing to the IIC interface of main control card is limited and IIC interface supports 1 to many communication modes, so the IIC interface of service card is linked together on backboard, it is connected with the IIC interface of main control card central processing unit by back panel connector the most again.If the central processing unit of some service card breaks down and causes iic bus the most occupied (data wire or clock line are forced to draw high or drag down) in equipment work process, so other service card central processing units will not receive the signal that main control card central processing unit sends, main control card central processing unit also cannot receive the signal that the service card central processing unit of any normal work sends simultaneously, causes the work of whole equipment the most abnormal.
Most of card insert type equipment are that the GPIO by service card central processing unit directly exports low and high level and controls the enable of iic bus buffer, when needs are with main control card communication, this enable is opened, when need not, this enable is closed, when avoiding central processing unit to break down, iic bus buffer is in open mode, open or close iic bus buffer will necessarily increase the complexity of software design owing to determining when frequently, it is also possible to the random iic bus buffer that allows open when service card central processing unit breaks down simultaneously, communication between interference main control card central processing unit and other normal service card central processing units.
Utility model content
Technical problem to be solved in the utility model is: the problem existed for prior art, there is provided a kind of and control the control circuit of service card iic bus buffer in card insert type equipment, what solution tradition occurred when directly controlling iic bus buffer by service card central processing unit opens iic bus buffer the situation of the service card central processing unit communication interfering with main control card central processing unit and normal work owing to central processing unit breaks down by mistake, determine when frequently also without software simultaneously and open or close iic bus buffer, greatly reduce the difficulty of software design.
The technical solution adopted in the utility model is as follows:
A kind of control the control circuit of service card iic bus buffer in card insert type equipment and include service card central processing unit, watchdog circuit, iic bus buffer, back panel connector and main control card central processing unit, central processing unit GPIO on described service card is connected with the signal input of watchdog circuit, the signal output of described watchdog circuit is connected with the enable input pin of I2C bus buffer, the IIC interface of described service card central processing unit is connected with the IIC signal input of I2C bus buffer, the IIC signal output of described iic bus buffer is by back panel connector to the IIC interface of main control card central processing unit, after the square-wave signal that central processing unit on service card exports is converted into low and high level signal by watchdog circuit, it is sent to iic bus buffer.This low and high level signal controls iic bus buffer and enables.
Further, being provided with timer circuit in described watchdog circuit, described intervalometer is not when receiving the square-wave signal of service card central processing unit output, and intervalometer will overflow, and then output low level signal.
According to claim 1 a kind of control the control circuit of service card iic bus buffer in card insert type equipment, it is characterised in that described watchdog circuit uses the chip of TPS3705-33, SGM706 or ADM706 model.
Further, the central processing unit model of described service card is MPC8308 or P1022 that freescale company produces.
Further, the chip of the TCA4311 model that described iic bus buffer employing TI company produces.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
This utility model is used in some GPIO output low and high levels directly using service card central processing units in the card insert type communication apparatus controlling iic bus buffer, by watchdog circuit, the square-wave signal that service card central processing unit exports can be converted into low and high level signal, this signal directly controls the opening and closing of iic bus buffer, avoid the mistiming broken down at service card central processing unit and iic bus buffer is opened the communication disturbed between main control card central processing unit and normal service card central processing unit, software need not frequently determine when and open or close iic bus buffer simultaneously, only need to fix output square-wave signal, it is substantially reduced the difficulty of software design.
Accompanying drawing explanation
This utility model will illustrate by example and with reference to the appended drawing, wherein:
Fig. 1 is this utility model electrical block diagram。
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
This utility model provides a kind of and controls the control circuit of service card iic bus buffer in card insert type equipment, its circuit structure is as shown in Figure 1, this circuit includes the central processor circuit on service card, watchdog circuit, iic bus buffer, back panel connector, the central processor circuit on main control card.Wherein, service card central processing unit must use can export square-wave pulse signal, MPC8308 or P1022 produced such as freescale company.Watchdog circuit can use the chip with watchdog circuit or directly use watchdog circuit, the present embodiment uses the chip with watchdog circuit, chip such as TPS3705-33, SGM706 or ADM706 model, the present embodiment uses iic bus buffer must control function with enabling, the opening and closing of iic bus buffer can be controlled, such as the chip of TCA4311 model by low and high level.
During connection, the GPIO pin that service card central processing unit produces square-wave signal is connected to the signal input of watchdog circuit, the signal output of watchdog circuit is connected with the enable input pin of iic bus buffer, the IIC interface of service card central processing unit is connected with the IIC signal input of iic bus buffer, and the IIC signal output of described iic bus buffer IIC interface with each groove position on back panel connector is unified after being connected to be connected on the IIC interface of main control card central processing unit.The inside of watchdog circuit is provided with a timer circuit, when service card central processing unit does not export square-wave signal, intervalometer will overflow, and then output low level signal, this low level signal controls iic bus buffer and closes, and makes the IIC interface of service card be off with the iic bus on backboard.
The operation principle of whole circuit is as follows: owing to carrying a timer circuit inside watchdog circuit, it needs to input square-wave signal at the input of watchdog circuit could be actually the rising edge of square-wave signal and trailing edge by clear for this intervalometer 0 by clear for this intervalometer 0(), if not by clear for this intervalometer 0 in 1.6S, intervalometer will overflow, make watchdog circuit outfan output low level signal, otherwise, watchdog circuit output high level.Therefore, utilize this principle of watchdog circuit, when service card central processing unit produces square-wave signal, the rising edge of signal and trailing edge can make this timer circuit reset, the outfan making watchdog circuit exports high level all the time, if the operating of service card central processing unit is abnormal, then can not produce square-wave signal, WatchDog Timer will overflow, control output end output low level, so, by watchdog circuit, the square-wave signal of fixed frequency produced by service card central processing unit is converted into simple low and high level signal, this low and high level signal directly controls the enable pin of iic bus buffer, thus control opening or closing of iic bus buffer.
All features disclosed in this specification, in addition to mutually exclusive feature, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), unless specifically stated otherwise, all can be by other equivalences or there is the alternative features of similar purpose replaced.I.e., unless specifically stated otherwise, an example during each feature is a series of equivalence or similar characteristics.
Claims (5)
- null1. one kind controls the control circuit of service card iic bus buffer in card insert type equipment，It is characterized in that including service card central processing unit、Watchdog circuit、Iic bus buffer、Back panel connector and main control card central processing unit，Central processing unit GPIO on described service card is connected with the signal input of watchdog circuit，The signal output of described watchdog circuit is connected with the enable input pin of I2C bus buffer，The IIC interface of described service card central processing unit is connected with the IIC signal input of I2C bus buffer，The IIC signal output of described iic bus buffer is by back panel connector to the IIC interface of main control card central processing unit，After the square-wave signal that central processing unit on service card exports is converted into low and high level signal by watchdog circuit，It is sent to iic bus buffer.
- The most according to claim 1 a kind of control the control circuit of service card iic bus buffer in card insert type equipment, it is provided with timer circuit in it is characterized in that described watchdog circuit, described intervalometer is not when receiving the square-wave signal of service card central processing unit output, intervalometer will overflow, and then output low level signal.
- The most according to claim 1 a kind of control the control circuit of service card iic bus buffer in card insert type equipment, it is characterised in that described watchdog circuit uses the chip of TPS3705-33, SGM706 or ADM706 model.
- The most according to claim 1 a kind of control the control circuit of service card iic bus buffer in card insert type equipment, it is characterised in that the central processing unit model of described service card is MPC8308 or P1022 that freescale company produces.
- The most according to claim 1 a kind of control the control circuit of service card iic bus buffer in card insert type equipment, it is characterised in that described iic bus buffer uses the chip of the TCA4311 model that TI company produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620362987.6U CN205721216U (en) | 2016-04-27 | 2016-04-27 | A kind of control the control circuit of service card iic bus buffer in card insert type equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620362987.6U CN205721216U (en) | 2016-04-27 | 2016-04-27 | A kind of control the control circuit of service card iic bus buffer in card insert type equipment |
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| Publication Number | Publication Date |
|---|---|
| CN205721216U true CN205721216U (en) | 2016-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620362987.6U Expired - Fee Related CN205721216U (en) | 2016-04-27 | 2016-04-27 | A kind of control the control circuit of service card iic bus buffer in card insert type equipment |
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| CN (1) | CN205721216U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109162954A (en) * | 2018-11-06 | 2019-01-08 | 迈普通信技术股份有限公司 | A kind of fan control device |
-
2016
- 2016-04-27 CN CN201620362987.6U patent/CN205721216U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109162954A (en) * | 2018-11-06 | 2019-01-08 | 迈普通信技术股份有限公司 | A kind of fan control device |
| CN109162954B (en) * | 2018-11-06 | 2020-04-03 | 迈普通信技术股份有限公司 | Fan control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20210427 |