CN204258828U - Realize Set Top Box and the module-integrated network interface circuit of EOC - Google Patents

Realize Set Top Box and the module-integrated network interface circuit of EOC Download PDF

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Publication number
CN204258828U
CN204258828U CN201420696820.4U CN201420696820U CN204258828U CN 204258828 U CN204258828 U CN 204258828U CN 201420696820 U CN201420696820 U CN 201420696820U CN 204258828 U CN204258828 U CN 204258828U
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transformer
phy chip
module
voltage
network interface
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李阳
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SHANGHAI LONGJING TECHNOLOGY Co Ltd
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SHANGHAI LONGJING TECHNOLOGY Co Ltd
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Abstract

The utility model relates to and a kind ofly realizes Set Top Box and the module-integrated network interface circuit of EOC, comprising current mode PHY chip, voltage-type PHY chip and network transformer module, the differential signal line that the differential signal line of described current mode PHY chip is corresponding with described voltage-type PHY chip is coupled by transformer, current center's tap of the winding of the network transformer module described in being connected with current mode PHY chip connects power supply, voltage center's tap ground connection of the winding of the network transformer module be connected with voltage-type PHY chip.Adopt and of the present utility modelly realize Set Top Box and the module-integrated network interface circuit of EOC, by current mode PHY chip and voltage-type PHY chip by transformer coupled thus realize the short distance communication of two kinds of dissimilar PHY chip, the signal avoiding Set Top Box and EOC to adopt different PHY chip to cause is incompatible, cost-saving, flexibility is strong, has range of application widely.

Description

Realize Set Top Box and the module-integrated network interface circuit of EOC
Technical field
The utility model relates to network interface techniques field, particularly relates to the network interface techniques field of Integral set top box, specifically refers to a kind ofly to realize Set Top Box and the module-integrated network interface circuit of EOC.
Background technology
Broadcasting and TV top box of digital machine industry, in current product system, mainly be divided into, SD and high definition, and intelligence, three kind products, with regard to these type Set Top Box, realizing two-way services communication, is all rely on peripheral EOC (Ethernet over Coax, the Ethernet based on coaxial cable transmits) product to realize information interaction;
The flow process that Set Top Box works together with EOC module is, cable television enters in EOC module, and cable TV signal is transmitted to Set Top Box, is played on TV for set top box decodes, and this is traditional one way traffic; User operation remote controller, send and need mutual information to deliver on server, such as program request, review, etc. business information time, Set Top Box is connected by the network interface of network interface with EOC module, then EOC module to return information modulation technique modulation after, delivering on server by cable television, usually realizing Set Top Box two-way services by this way;
When two network equipments (Set Top Box and EOC module) carry out interactive correspondence, in physical layer, signal from CPU out after all through PHY chip (a kind of chip providing the access passage of Ethernet) to network transformer to RJ45 socket, as shown in Figure 1, wherein, PHY chip is to the type of drive of network transformer, be divided into voltage-type and current mode drive, and network transformer is except the effect having isolation, the effect pulling potential balance between PHY chip and PHY chip in addition, so that middle netting twine (twisted-pair feeder) UNICOM, realizes long distance communication.
And in user family, need connection two equipment (Set Top Box and EOC module) just can carry out program request or other two-way services, as shown in Figure 2, and two equipment mean needs two power supplys, a netting twine, 75 Europe coaxial wires, so both cost was caused to waste, bring a lot of inconvenience to again user and installation, therefore under such overall background, the all-in-one of Set Top Box and EOC is assented and gives birth to, Set Top Box and EOC module two device systems are integrated in a box, how to be connected to become crucial technical problem, in all connections, the connection of network interface and network interface is guardian technique, direct impact can realize two-way services, simultaneously, current mode PHY chip and voltage-type PHY chip can not direct-connectedly use because type of drive is not both.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, provide a kind of by current mode PHY chip and voltage-type PHY chip by transformer coupled thus realize the short distance communication of two kinds of dissimilar PHY chip, the signal avoiding Set Top Box and EOC to adopt different PHY chip to cause is incompatible, cost-saving, Set Top Box that what flexibility was strong realize and the module-integrated network interface circuit of EOC.
To achieve these goals, of the present utility modelly Set Top Box is realized and the module-integrated network interface circuit of EOC has following formation:
This realizes Set Top Box and the module-integrated network interface circuit of EOC, its main feature is, described network interface circuit comprises current mode PHY chip, voltage-type PHY chip and network transformer module, the differential signal line that the differential signal line of described current mode PHY chip is corresponding with described voltage-type PHY chip is coupled by transformer, current center's tap of the winding of the network transformer module described in being connected with current mode PHY chip connects power supply, voltage center's tap ground connection of the winding of the network transformer module be connected with voltage-type PHY chip.
Further, described network interface circuit also comprises electric capacity, and the two ends of described electric capacity connect described current center's tap and ground respectively.
Further, described network interface circuit also comprises resistance, and the two ends of described resistance connect described current center's tap and described electric capacity respectively.
Further, the resistance of described resistance is 75 ohm, and described electric capacity is high pressure ceramic disc capacitor.
Wherein, described network transformer module comprises the first transformer and the second transformer, the former limit winding of first transformer described in the connection of transmission data pin of described voltage-type PHY chip, the vice-side winding of first transformer described in the connection of reception data pin of described current mode PHY chip;
The former limit winding of second transformer described in the connection of reception data pin of described voltage-type PHY chip, the vice-side winding of second transformer described in the connection of transmission data pin of described current mode PHY chip;
Power supply described in the centre cap of the former limit winding of the first described transformer is connected with the centre cap of the former limit winding of the second transformer;
Ground described in the centre cap of the vice-side winding of the first described transformer is connected with the centre cap of the vice-side winding of the first transformer;
The former limit winding of the first described transformer and the turn ratio of vice-side winding are 1:1, and the former limit winding of the second described transformer and the turn ratio of vice-side winding are 1:1.
Have employed and of the present utility modelly realize Set Top Box and the module-integrated network interface circuit of EOC, there is following positive benefit:
1, the centre cap of network transformer connects electric capacity and carrys out filtering, mainly acts on current mode PHY chip, because electric current is likely saturated.
2, adopt R1, R2 to be 75ohm terminating resistor, this resistance provide differential lines between the termination of 150ohm, be mainly used in the impedance matching of mixed mode signal, by 75 Europe grounding through resistances, form current circuit.
3, high-voltage capacitance C1 cable terminations is connected to (GND) improve EMI (Electro Magnetic Interference, electromagnetic interference), due to electric capacity also contact resistance, lead inductance and other restriction, this circuit is made to be not only a ground connection low impedance path, achieve impedance matching function and strengthen EMI function, can also antistatic thunderbolt.
In a word, of the present utility modelly realize the effect that Set Top Box and the module-integrated network interface circuit of EOC utilize network transformer self transmission data and isolation, the coil that the differential signal sent out by PHY is coupled by differential mode carries out coupling filtering, strengthen signal, and the other end of the connected with network cable of varying level is coupled to by the conversion of electromagnetic field, simultaneously, the varying level of two different LA Management Rooms that netting twine connects by transformer isolation, preventing different voltage by network cable transmission damage equipment.
In addition, by special circuit design, the double-current type PHY chip that circuit of the present utility model not only can use or twin voltage type PHY chip form coupling circuit, also can in order to meet the various property requirements of two kinds of dissimilar PHY chip, current mode and voltage-type are coupled together, thus reach the short distance communication that a network transformer realizes two kinds of dissimilar PHY chip, the signal avoiding Set Top Box and EOC to adopt different PHY chip to cause is incompatible, two RJ45 stands can be omitted, , netting twine and 1 network transformer, pcb board size is reduced, greatly reduce the cost of all-in-one, and flexibility is strong, there is range of application widely.
Accompanying drawing explanation
Fig. 1 is the connection diagram of two traditional PHY chip of the present utility model.
Fig. 2 is the connection diagram of traditional Set Top Box of the present utility model and EOC module.
Fig. 3 is the typical connection diagram of current drive-type PHY chip of the present utility model.
Fig. 4 is the typical connection diagram of voltage driven type PHY chip of the present utility model.
Fig. 5 is the connection diagram of identical PHY chip of the present utility model.
Fig. 6 is the connection diagram realizing Set Top Box and the module-integrated network interface circuit of EOC of the present utility model
Embodiment
In order to more clearly describe technology contents of the present utility model, conduct further description below in conjunction with specific embodiment.
The Set Top Box Elite1000 model C PU (ARM Cortex-A9 double-core 1.2GHz) that Weisheng (VIA) manufactures and designs, for in the Intelligent set top box product that east, Shanghai is wired, this CPU is PCIE bus, the PHY chip of peripheral driver is the RTL8111GS chip that Realtek (RealTek) is produced, this is a current drive-type PHY, concrete catenation principle figure as shown in Figure 3, for the connection of typical current drive-type PHY chip, as seen from the figure, the differential data line of PHY chip is connected on network transformer, the centre cap of network transformer is by electric capacity C1, C2 ground connection.
EOC module is the module of Shanghai Future broadband company, be with 4 Lan mouths and 1 WIFI, be wherein the AR9331 model that high pass is produced with the chip of STB network communication, chip is connected to the schematic diagram of network transformer as shown in Figure 4, for the connection of typical voltage driven type PHY chip, as seen from the figure, the centre cap of transformer meets power vd D_2.0V.
The PHY of two types more than opering characteristic of electric apparatus analysis, as long as current mode has loop, just can realize coupling, Serial Communication of going forward side by side; And voltage-type, as long as in the drive voltage range that PHY specifies, just energy communication;
More than communication signal analysis, the PHY of two types, if be both voltage-type PHY chip or current mode PHY chip, because two PHY chip have consistent differential signal, can take direct-connected mode to realize communication, as shown in Figure 5.
From the above PHY analyzing two types, the PHY of current mode and voltage-type direct-connectedly to use; And solve the key of this interconnection technique, be exactly want Signal Matching and signal-balanced, for this reason, use the network transformer of a 1CT:1CT to solve coupling and equilibrium problem, both achieved data communication, and again saved cost
Refer to shown in Fig. 6, in one embodiment, of the present utility modelly realize Set Top Box and the module-integrated network interface circuit of EOC comprises current mode PHY chip, voltage-type PHY chip and network transformer module, the differential signal line that the differential signal line of described current mode PHY chip is corresponding with described voltage-type PHY chip is coupled by transformer, current center's tap of the winding of the network transformer module described in being connected with current mode PHY chip connects power supply, voltage center's tap ground connection of the winding of the network transformer module be connected with voltage-type PHY chip.
Preferred embodiment gather in one, described network interface circuit also comprises electric capacity, and the two ends of described electric capacity connect described current center's tap and ground respectively.
Gather at the preferred execution mode of one, described network interface circuit also comprises resistance, and the two ends of described resistance connect described current center's tap and described electric capacity respectively.
Gather at the preferred execution mode of one, the resistance of described resistance is 75 ohm, and described electric capacity is high pressure ceramic disc capacitor.
Wherein, described network transformer module comprises the first transformer and the second transformer, the former limit winding of first transformer described in the connection of transmission data pin of described voltage-type PHY chip, the vice-side winding of first transformer described in the connection of reception data pin of described current mode PHY chip;
The former limit winding of second transformer described in the connection of reception data pin of described voltage-type PHY chip, the vice-side winding of second transformer described in the connection of transmission data pin of described current mode PHY chip;
Power supply described in the centre cap of the former limit winding of the first described transformer is connected with the centre cap of the former limit winding of the second transformer;
Ground described in the centre cap of the vice-side winding of the first described transformer is connected with the centre cap of the vice-side winding of the first transformer;
The former limit winding of the first described transformer and the turn ratio of vice-side winding are 1:1, and the former limit winding of the second described transformer and the turn ratio of vice-side winding are 1:1.
The DAC (Digital to Analog Converter, digital analog converter) of PHY have voltage driven and current drives point, for RTL8111GS chip and AR9331 chip, RTL8111GS is that voltage-type drives, and AR9331 is current mode drive,
From PHY chip RTL8111GS, the coil windings of network transformer TX and RX of external coupling is 1CT:1CT, see PHY chip AR9331 more simultaneously, also be the coil windings of the 1CT:1CT of coupling, like this, select TX and RX to be that the transformer of the winding of 1CT:1CT does isolation with being coupled and uses, the butt coupling between chip can be met, in addition, hold with voltage-type PHY the centre cap of the transformer be connected must connect electric capacity and carry out filtering.
2 of RTL8111GS chip groups of differential signal lines are connected to network transformer TX+, and on TX-, RX+, RX-, centre cap CT, by 75 Europe grounding through resistances, forms current circuit; High-voltage capacitance can antistatic thunderbolt.
The differential signal of AR9331 chip is connected to the TD+ of network transformer, on TD-, RD+, RD-, centre tapped CT, driving voltage in connection, defines voltage driven type.
Have employed and of the present utility modelly realize Set Top Box and the module-integrated network interface circuit of EOC, there is following positive benefit:
1, the centre cap of network transformer connects electric capacity and carrys out filtering, mainly acts on current mode PHY chip, because electric current is likely saturated.
2, adopt R1, R2 to be 75ohm terminating resistor, this resistance provide differential lines between the termination of 150ohm, be mainly used in the impedance matching of mixed mode signal, by 75 Europe grounding through resistances, form current circuit.
3, high-voltage capacitance C1 cable terminations is connected to (GND) improve EMI (Electro Magnetic Interference, electromagnetic interference), due to electric capacity also contact resistance, lead inductance and other restriction, this circuit is made to be not only a ground connection low impedance path, achieve impedance matching function and strengthen EMI function, can also antistatic thunderbolt.
In a word, of the present utility modelly realize the effect that Set Top Box and the module-integrated network interface circuit of EOC utilize network transformer self transmission data and isolation, the coil that the differential signal sent out by PHY is coupled by differential mode carries out coupling filtering, strengthen signal, and the other end of the connected with network cable of varying level is coupled to by the conversion of electromagnetic field, simultaneously, the varying level of two different LA Management Rooms that netting twine connects by transformer isolation, preventing different voltage by network cable transmission damage equipment.
In addition, by special circuit design, the double-current type PHY chip that circuit of the present utility model not only can use or twin voltage type PHY chip form coupling circuit, also can in order to meet the various property requirements of two kinds of dissimilar PHY chip, current mode and voltage-type are coupled together, thus reach the short distance communication that a network transformer realizes two kinds of dissimilar PHY chip, the signal avoiding Set Top Box and EOC to adopt different PHY chip to cause is incompatible, two RJ45 stands can be omitted, , netting twine and 1 network transformer, pcb board size is reduced, greatly reduce the cost of all-in-one, and flexibility is strong, there is range of application widely.
In this description, the utility model is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.

Claims (6)

1. one kind realizes Set Top Box and the module-integrated network interface circuit of EOC, it is characterized in that, described network interface circuit comprises current mode PHY chip, voltage-type PHY chip and network transformer module, the differential signal line that the differential signal line of described current mode PHY chip is corresponding with described voltage-type PHY chip is coupled by transformer, current center's tap of the winding of the network transformer module described in being connected with current mode PHY chip connects power supply, voltage center's tap ground connection of the winding of the network transformer module be connected with voltage-type PHY chip.
2. according to claim 1ly realize Set Top Box and the module-integrated network interface circuit of EOC, it is characterized in that, described network interface circuit also comprises electric capacity, and the two ends of described electric capacity connect described current center's tap and ground respectively.
3. according to claim 2ly realize Set Top Box and the module-integrated network interface circuit of EOC, it is characterized in that, described network interface circuit also comprises resistance, and the two ends of described resistance connect described current center's tap and described electric capacity respectively.
4. according to claim 3ly realize Set Top Box and the module-integrated network interface circuit of EOC, it is characterized in that, the resistance of described resistance is 75 ohm, and described electric capacity is high pressure ceramic disc capacitor.
5. according to any one of claim 1 to 3ly realize Set Top Box and the module-integrated network interface circuit of EOC, it is characterized in that, described network transformer module comprises the first transformer and the second transformer, the former limit winding of first transformer described in the connection of transmission data pin of described voltage-type PHY chip, the vice-side winding of first transformer described in the connection of reception data pin of described current mode PHY chip;
The former limit winding of second transformer described in the connection of reception data pin of described voltage-type PHY chip, the vice-side winding of second transformer described in the connection of transmission data pin of described current mode PHY chip;
Power supply described in the centre cap of the former limit winding of the first described transformer is connected with the centre cap of the former limit winding of the second transformer;
Ground described in the centre cap of the vice-side winding of the first described transformer is connected with the centre cap of the vice-side winding of the first transformer.
6. according to claim 5ly realize Set Top Box and the module-integrated network interface circuit of EOC, it is characterized in that, the former limit winding of the first described transformer and the turn ratio of vice-side winding are 1:1, and the former limit winding of the second described transformer and the turn ratio of vice-side winding are 1:1.
CN201420696820.4U 2014-11-19 2014-11-19 Realize Set Top Box and the module-integrated network interface circuit of EOC Active CN204258828U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105897212A (en) * 2015-12-08 2016-08-24 乐视致新电子科技(天津)有限公司 Electromagnetic interference suppression method and device
CN107291648A (en) * 2017-06-07 2017-10-24 上海乐野网络科技有限公司 A kind of Capacitor apart device
CN107820139A (en) * 2017-11-07 2018-03-20 晶晨半导体(上海)股份有限公司 A kind of network interface circuit
EP3393087A1 (en) * 2017-04-20 2018-10-24 Eutelsat S.A. Ethernet over coaxial hybrid adapter providing an ac/dc power supply path and a dvb-s/s2 path on the same coaxial cable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105897212A (en) * 2015-12-08 2016-08-24 乐视致新电子科技(天津)有限公司 Electromagnetic interference suppression method and device
WO2017096806A1 (en) * 2015-12-08 2017-06-15 乐视控股(北京)有限公司 Method and apparatus for suppressing electromagnetic interference
EP3393087A1 (en) * 2017-04-20 2018-10-24 Eutelsat S.A. Ethernet over coaxial hybrid adapter providing an ac/dc power supply path and a dvb-s/s2 path on the same coaxial cable
CN107291648A (en) * 2017-06-07 2017-10-24 上海乐野网络科技有限公司 A kind of Capacitor apart device
CN107820139A (en) * 2017-11-07 2018-03-20 晶晨半导体(上海)股份有限公司 A kind of network interface circuit

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