CN202737865U - PHY TO PHY onboard connection device in short-distance communication - Google Patents

Abstract

The utility model relates to a PHY TO PHY onboard connection device in short-distance communication. The device comprises a first SOC, a second SOC, a first PHY and a second PHY. The first SOC is connected with the first PHY; the second SOC is connected with the second PHY; and TXs and RXs of the first PHY and the second PHY are respectively connected by an isolation transformer. According to the utility model, aiming at the condition that the driving voltages of PHY ICs (or modules) of two SOCs are different and the communication distance is less than 15cm, the connection can be directly implemented by one isolation transformer and the cost is saved.

Description

PHY TO PHY plate carries jockey in a kind of short haul connection

[technical field]

The utility model belongs to the communications field, is specifically related to that PHYTO PHY plate carries jockey in a kind of short haul connection.

[background technology]

SOC (System on Chip), its application is very wide, comprises STB, MP3, MP4, PDA, MID etc.The signal level that produces in the time of the chip operation of a CMOS processing procedure is always greater than 0V, but such signal is delivered to the loss that 100 meters even longer place have very large DC component.If extranets now directly link to each other with chip, electromagnetic induction (thundering) and static are easy to cause the damage of chip.The equipment ground method is different, the power grid environment difference can cause both sides' 0V level inconsistent, signal passes to B from A like this, because the 0V level of A equipment and 0V level that B is ordered are different, can cause so very large electric current to flow to the low equipment of electromotive force from the high equipment of electromotive force.This device of Transformer (isolating transformer) has at this moment just appearred.The differential signal that it sends out PHY strengthening signal, and is coupled to an other end of connected with network cable with the coil coupling filtering of differential mode coupling by the conversion of electromagnetic field.So not only making does not have connection physically between netting twine and the PHY and changes and transmitted signal, has cut off the DC component in the signal, can also transmit data in the equipment of different 0V level.Isolating transformer itself is exactly the voltage that is designed to anti-2KV～3KV.Also played the effect of lightning protection induction protection.

Between two systems, if to the other side's attribute of connection with apart from being unknown, just must adopt isolating transformer.The effect of isolating transformer: at first, in order to strengthen signal, make the distance farther (100M) of signal transmission; Secondly in order to reduce the interference that transmission brings between long distance; Again adopt every change, play the different PHY IC of Protection voltage, make system works more stable.

As shown in Figure 1, PHYA2 adopts respectively isolating transformer A3 to be connected with isolating transformer B3 with TX, the RX interface of PHYB2.In the prior art, no matter be long haul communication or short haul connection, all adopt scheme shown in Figure 1, certainly will increase unnecessary cost like this.

[summary of the invention]

Technical problem to be solved in the utility model is to provide that PHY TOPHY plate carries jockey in a kind of short haul connection, be applicable to the distance less than 15cm with interior situation, and cabling is not placed on outside the main frame, can only need an isolating transformer, saves cost.

The utility model solves the problems of the technologies described above by the following technical solutions:

PHY TO PHY plate carries jockey in a kind of short haul connection, comprises a SOC, the 2nd SOC, a PHY, the 2nd PHY; A described SOC connects a described PHY; Described the 2nd SOC connects described the 2nd PHY; A described PHY all is connected by an isolating transformer with TX, the RX of described the 2nd PHY.

The utility model has the advantage of: if the driving voltage of the PHY IC (or module) of two SOC is different, and communication distance less than 15cm with interior situation, can adopt isolating transformer to realize connecting, saved cost.

[description of drawings]

The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is that PHYTO PHY plate carries the jockey schematic diagram in the prior art.

Fig. 2 is the utility model structural representation.

Fig. 3 is the utility model circuit diagram.

[embodiment]

If the distance between two systems only has in the 15cm, and cabling is not placed on outside the main frame, and as shown in Figure 2, PHY TO PHY plate carries jockey in the short haul connection, comprises SOCA1, SOCB1, PHYA2, PHYB2; SOCA1 connects PHYA2; SOCB1 connects PHYB2; PHYA2 all is connected by isolating transformer A3 with TX, the RX of PHYB2.

Can find out that from circuit diagram Fig. 3 left end does not have the differential signal matching network, right-hand member has (being R151 and R152, R155 and R156).This is that the outside does not just need to have increased, if increase can cause the impedance mismatch of differential signal, will cause system to work because the matching network of left end has been integrated into SOC inside.

As for being to connect power supply every the centre cap (pin2 of HS1102L and pin7 pin) that becomes, or ground connection, or meet 2.5V or 1.8V when connecing power supply, these and PHY have direct relation, need to be with reference to the DATASHEET of PHY.

Therefore, if the driving voltage of the PHY IC (or module) of two SOC is different, and communication distance can adopt isolating transformer to realize connecting less than 15cm with interior situation, saved cost.

Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present utility model to its suitable variation or modification of doing.

Claims (1)

1. PHY TO PHY plate carries jockey in the short haul connection, it is characterized in that: comprise a SOC, the 2nd SOC, a PHY, the 2nd PHY; A described SOC connects a described PHY; Described the 2nd SOC connects described the 2nd PHY; A described PHY all is connected by an isolating transformer with TX, the RX of described the 2nd PHY.

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