CN106656872A - Mixed physical coding sublayer and data transmitting and receiving method - Google Patents

Mixed physical coding sublayer and data transmitting and receiving method Download PDF

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Publication number
CN106656872A
CN106656872A CN201510425527.3A CN201510425527A CN106656872A CN 106656872 A CN106656872 A CN 106656872A CN 201510425527 A CN201510425527 A CN 201510425527A CN 106656872 A CN106656872 A CN 106656872A
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China
Prior art keywords
data
physical coding
coding sublayer
code
alignment
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沈岚
余晨
安康
王志忠
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Sanechips Technology Co Ltd
Shenzhen ZTE Microelectronics Technology Co Ltd
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Shenzhen ZTE Microelectronics Technology Co Ltd
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Priority to CN201510425527.3A priority Critical patent/CN106656872A/en
Priority to PCT/CN2016/090217 priority patent/WO2017012517A1/en
Publication of CN106656872A publication Critical patent/CN106656872A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40Bus networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/38Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40Transmitting circuits; Receiving circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)

Abstract

The invention discloses a mixed physical coding sublayer and data transmitting and receiving method, and the mixed physical coding sublayer comprises a transmitting module and a receiving module. The transmitting module comprises four PCS (physical coding sublayer) basic transmitting units, a code block replacement and selection unit, and an unbalance value calculating processing unit. The receiving module comprises an alignment code detection processing unit, a code block reduction selection unit, four PCS basic receiving units, and an unbalance value calculating processing unit. The code block replacement and selection unit, the unbalance value calculating processing units, the alignment code detection processing unit and the code block reduction selection unit are combined with a corresponding four-channel unit and a corresponding single-channel unit, and different units are selected for corresponding processing.

Description

Mixing Physical Coding Sublayer and data is activation, method of reseptance
Technical field
The present invention relates to telecommunications Ethernet field, more particularly to a kind of mixing Physical Coding Sublayer and data is activation, method of reseptance.
Background technology
Computer and other network equipments are being allowed to be formed in the technology of LAN, Ethernet has become main networking technology, and is standardized in IEEE802.3 family of standards.Ethernet standard evolution over time, medium access control, different physical media channels or other functions for making the different distortion of existing Ethernet protocol support higher bandwidth, improve.Such as IEEE802.3 has process standard of the coverage from the speed of 10Mbit/s, 100Mbit/s, 1Gbit/s to 10Gbit/s and even more high now, and with the deformation of management physical channel (such as coaxial cable, optical fiber and unshielded/shielded twisted-pair cable).
At present gigabit class Ethernet interface technology develops comparative maturity, and gigabit Ethernet has been widely used in the industries such as finance, business, education, government bodies with the characteristics of efficient, high speed, high-performance.In order to meet requirement of the ethernet communication to high speed data transfer,Have the advantages that wiring is simple and signal integrity is good in circuit design simultaneously,Cisco (CISCO) company proposes serial gigabit GMII (SGMII,Serial Gigabit Media Independent Interface) and four-way serial gigabit GMII (QSGMII,Quad Serial Gigabit Media Independent Interface) interface specification,Actually it is the extension of Physical Coding Sublayer specification to former optical fiber gigabit Ethernet (1000BASE-SX) PCS (Physical Coding Sublayer).Simultaneously SGMII/QSGMII is also had been widely used among gigabit Ethernet communications.The application demand of different scenes is met so as in current gigabit class interface physical coding sub-layer design, need external support 1000BASE-SX/SGMII/QSGMII and is docked with the interface of different manufacturers.Accordingly, it is capable to supporting the inexpensive the Ethernet Interface Design of various gigabit port shape modes becomes the technical problem for building highly compatible ethernet communication system urgent need to resolve.
The content of the invention
To solve above-mentioned technical problem, a kind of mixing Physical Coding Sublayer and its data is activation, method of reseptance are embodiments provided.
Mixing Physical Coding Sublayer provided in an embodiment of the present invention includes:Sending module, the sending module includes:
4 Physical Coding Sublayer (PCS, Physical Encoding Sublayer) basic transmitting element, for to 4 medium access control (MAC, Media Access Control) data that send of 4 sets of layer sending side gigabit GMII (GMII, Gigabit Media Independent Interface) replace insertion and coded treatment while doing ordered set;
Code character replaces select unit, for after coded treatment, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.5 code characters of first passage being replaced with into K28.1 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, replacement process is not made;
Unbalanced value calculation processing unit, for the unbalanced value when mixing Physical Coding Sublayer is operated in 4 passage scene, needed for being processed using the unbalanced value calculation code of 4 passages;For the unbalanced value when mixing Physical Coding Sublayer is operated in single channel scene, needed for being processed using the unbalanced value calculation code of single channel.
In the embodiment of the present invention, the basic transmitting elements of each PCS include:
Standard sends state machine module, and for the data that the MAC layer sending side Jing GMII of a passage send to be done into ordered set insertion process is replaced, and it is the code character form encoded suitable for 8B/10B to encapsulate data;
8B/10B coding modules, for sending the code stream that state machine module is handled well to standard 8B/10B coded treatments are carried out, wherein, 8B/10B coded treatments need unbalanced value as input;SERDES sending sides are sent data to after coded treatment and does parallel data to the conversion of serial data;
Auto-negotiation processing module, for completing the Capacity Coordination operation at communication two ends by auto-negotiation.
In the embodiment of the present invention, the code character replaces select unit, is additionally operable to according to control signal, chooses whether for the K28.1 code characters of first passage to replace with K28.5 code characters;
The unbalanced value calculation processing unit, is additionally operable to according to control signal, and the unbalanced value calculation code of the passage of Selection utilization 4 processes required unbalanced value, or the unbalanced value needed for processing using the unbalanced value calculation code of single channel.
The mixing Physical Coding Sublayer that another embodiment of the present invention is provided includes:Receiver module, the receiver module includes:
Alignment code detection process unit, for when mixing Physical Coding Sublayer is operated in 4 passage scene, the alignment of data that will be sent from SERDES being detected using 4 passages alignment code;When mixing Physical Coding Sublayer is operated in single channel scene, the alignment of data that will be sent from SERDES using single channel alignment code detection;
Code character reduces select unit, for after alignment of data, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.1 code characters of first passage being reverted to into K28.5 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, reduction treatment is not made;
The basic receiving unit of 4 PCS, to after alignment of data, doing decoding process to the data of 4 passages and removing ordered set code character, data-stream form of the data stream recovery for GMII is sent to 4 MAC layer receiving sides;
Unbalanced value calculation processing unit, for when mixing Physical Coding Sublayer is operated in 4 passage scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of 4 passages;For when mixing Physical Coding Sublayer is operated in single channel scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of single channel.
In the embodiment of the present invention, the basic receiving units of each PCS include:
8B/10B decoder modules, for carrying out 8B/10B decoding operates to the data after alignment;
Standard user equipment module, for removing ordered set code character through the decoded data of 8B/10B, data-stream form of the data stream recovery for GMII being sent to MAC layer receiving side.
In the embodiment of the present invention, the code character reduces select unit, is additionally operable to the alignment of data that will be sent from SERDES according to control signal, the alignment code detection of the passage of Selection utilization 4 or single channel alignment code detection;
The unbalanced value calculation processing unit, is additionally operable to according to control signal, and the unbalanced value of the passage of Selection utilization 4 calculates the unbalanced value needed for decoding process, or the unbalanced value needed for decoding process is calculated using the unbalanced value of single channel.
The mixing Physical Coding Sublayer that another embodiment of the present invention is provided includes above-mentioned sending module, and receiver module.
The data transmission method for uplink of mixing Physical Coding Sublayer provided in an embodiment of the present invention includes:
The data that receiving mac layer sending side is sent by GMII;
The data are carried out with ordered set and replaces insertion and coded treatment, wherein, when carrying out coded treatment, when mixing Physical Coding Sublayer is operated in 4 passage scene, unbalanced value needed for being processed using the unbalanced value calculation code of 4 passages, unbalanced value when mixing Physical Coding Sublayer is operated in single channel scene, needed for being processed using the unbalanced value calculation code of single channel;
When mixing Physical Coding Sublayer and being operated in 4 passage scene, the K28.5 code characters of first passage are replaced with into K28.1 code characters, and send to SERDES sending sides and do parallel data to the conversion of serial data;When mixing Physical Coding Sublayer is operated in single channel scene, do not make replacement process, directly send data to SERDES sending sides and do parallel data to the conversion of serial data.
In the embodiment of the present invention, the ordered set that carries out to the data replaces insertion and coded treatment, including:
The data that the MAC layer sending side Jing GMII of one passage send are done into ordered set and replaces insertion process, it is the code character form encoded suitable for 8B/10B to encapsulate data;
Code stream to handling well carries out 8B/10B coded treatments, wherein, 8B/10B coded treatments need unbalanced value as input.
In the embodiment of the present invention, methods described also includes:
The Capacity Coordination operation at communication two ends is completed by auto-negotiation.
The data receiver method of mixing Physical Coding Sublayer provided in an embodiment of the present invention includes:
When mixing Physical Coding Sublayer is operated in 4 passage scene, the alignment of data that will be sent from SERDES using the alignment code detection of 4 passages;When mixing Physical Coding Sublayer is operated in single channel scene, the alignment of data that will be sent from SERDES using single channel alignment code detection;
After alignment of data, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.1 code characters of first passage are reverted to into K28.5 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, reduction treatment is not made;
After alignment of data, decoding process is done to the data of 4 passages and ordered set code character is removed, data-stream form of the data stream recovery for GMII is sent to 4 MAC layer receiving sides;Wherein, when mixing Physical Coding Sublayer is operated in 4 passage scene, the unbalanced value needed for decoding process is calculated using the unbalanced value of 4 passages;For when mixing Physical Coding Sublayer is operated in single channel scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of single channel.
It is described after alignment of data in the embodiment of the present invention, decoding process is done to the data of 4 passages and ordered set code character is removed, data-stream form of the data stream recovery for GMII is sent to 4 MAC layer receiving sides, including:
8B/10B decoding operates are carried out to the data after alignment;To removing ordered set code character through the decoded data of 8B/10B, data-stream form of the data stream recovery for GMII is sent to MAC layer receiving side.
The technical scheme of the embodiment of the present invention hardly increases the gigabit Ethernet Physical Coding Sublayer that any extra resource cost consumption can support multiple interfaces pattern to include QSGMII/SGMII/1000BASE-X there is provided a kind of in QSGMII design basis.By the similarities and differences for carefully analyzing the Physical Coding Sublayer processing structure of QSGMII and SGMII/1000BASE-X, extract the original reusable logic modules of QSGMII, the logic module resource of a small amount of SGMII/1000BASE-X of affix is obtained while supporting various gigabit interface modes and Physical Coding Sublayer that resources costs almost do not increase.Compared to the resource consumption that the Physical Coding Sublayer design for directly adding QSGMII using SGMII/1000BASE-X can at least save 1/4.The mixing Physical Coding Sublayer of the embodiment of the present invention includes sending module, and the sending module includes:The basic transmitting element of 4 same PCS.Wherein, the basic transmitting elements of each PCS include that standard sends state machine module, 8B/10B coding modules, auto-negotiation processing module.Code character replaces select unit, for after coded treatment, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.5 code characters of first passage being replaced with into K28.1 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, replacement process is not made.Unbalanced value calculation processing unit, for the unbalanced value when mixing Physical Coding Sublayer is operated in 4 passage scene, needed for being processed using the unbalanced value calculation code of 4 passages;For the unbalanced value when mixing Physical Coding Sublayer is operated in single channel scene, needed for being processed using the unbalanced value calculation code of single channel.
The mixing Physical Coding Sublayer of the embodiment of the present invention also includes receiver module, and the receiver module includes:The basic receiving unit of 4 same PCS.Wherein, the basic receiving units of each PCS include standard user equipment module, 8B/10B decoder modules.Alignment code detection process unit, for when mixing Physical Coding Sublayer is operated in 4 passage scene, the alignment of data that will be sent from SERDES being detected using 4 passages alignment code;When mixing Physical Coding Sublayer is operated in single channel scene, the alignment of data that will be sent from SERDES using single channel alignment code detection.Code character reduces select unit, for after alignment of data, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.1 code characters of first passage being reverted to into K28.5 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, reduction treatment is not made.Unbalanced value calculation processing unit, for when mixing Physical Coding Sublayer is operated in 4 passage scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of 4 passages;For when mixing Physical Coding Sublayer is operated in single channel scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of single channel.The embodiment of the present invention is not in the case where extra resource consumption is almost increased, so that single QSGMII can support extra various transmission modes (SGMII, 1000BASE-SX), chip cost is applied to relatively low, while ensureing that communication equipment can be flexibly applied to diversified scene.
Description of the drawings
Fig. 1 is SGMII/1000BASE-X Physical Coding Sublayer structure charts;
Fig. 2 is QSGMII Physical Coding Sublayer structure charts;
Fig. 3 is the structural representation of the mixing Physical Coding Sublayer of the embodiment of the present invention;
Fig. 4 is that the unbalanced value of single channel processes schematic diagram;
Fig. 5 is that the unbalanced value of 4 passages processes schematic diagram;
Fig. 6 is the data is activation flow chart of the mixing Physical Coding Sublayer of the embodiment of the present invention;
Fig. 7 is the data receiver flow chart of the mixing Physical Coding Sublayer of the embodiment of the present invention.
Specific embodiment
The characteristics of in order to more fully hereinafter understand the embodiment of the present invention and technology contents, the below in conjunction with the accompanying drawings realization to the embodiment of the present invention is described in detail, appended accompanying drawing purposes of discussion only for reference, not for limiting the embodiment of the present invention.
As shown in figure 1, it is shown that the Physical Coding Sublayer structure chart of SGMII/1000BASE-X in black surround in figure.
MAC layer sending side is done ordered set and replaces insertion and coded treatment by SGMII/1000BASE-X Physical Coding Sublayers sending side by the data that GMII sends, and bit wide is changed into 10bit from 8 bits (bit) extension after coding.Physical Coding Sublayer by the data flow of 10bit with 125Mhz outputs to SERializer serializers/DESerializer deserializers (SERDES) sending side 1, parallel-serial conversion is done to parallel data and is converted into serial bit stream outputs by SERDES sending sides 1.
Now actual speed rate is 10bit × 125Mhz=1.25Gbps, and it is 1.25Gpbs*8/10=1Gbps that effective speed is the expense of removing 8B/10B codings.From the point of view of Physical Coding Sublayer for single SGMII/1000BASE-X, its corresponding SERDES sending side 1 and SERDES receiving sides 1 only need fixation to be operated in the tupe of 10bit bit wides.Note the bit wide reality or 40bit of SERDES sending sides 1 and SERDES receiving sides 1, simply now fixation is operated under the effective patterns of only low 10bit.
SGMII/1000BASE-X Physical Coding Sublayers receiving side is received and comes from the 10bit parallel datas that SERDES receiving sides 1 have passed through serioparallel exchange recovery, decoding operate is done after realigning, data-stream form of the ordered set code character by data stream recovery for GMII is removed and is sent MAC layer receiving side back to.
SGMII/1000BASE-X Physical Coding Sublayers sending side mainly includes the basic transmitting elements of PCS, the unbalanced value computing unit of single channel.The basic transmitting elements of PCS include that standard sends state machine module, 8B/10B coding modules, auto-negotiation processing module.
Standard sends state machine module:The transmission state machine architecture figure of the 1000BASE-SX mainly in standard 802.3-2008_section3Figure36-5, Figure36-6 of IEEE is write, realize gigabit Ethernet PCS ordered set conversion and insert, abnormal conditions such as redirect at the encapsulation process, add opening code/S/, end code/T/, bell idles/I/ codes for data, data flow is encapsulated as being applied to the code character form of 8B/10B codings.
8B/10B coding modules, the code stream put in order according to insertion carries out 8B/10B encoding operations, and 8B/10B coded treatments need unbalanced value as input, provided by the unbalanced value computing unit of single channel.Data can be sent directly into SERDES sending sides 1 and do parallel data to the conversion of serial data after the completion of coding.
Auto-negotiation processing module:The auto-negotiation processing state machine of 1000BASE-SX in standard 802.3-2008_section3Figure37-6 of IEEE is mainly realized, the Capacity Coordination operation at communication two ends can be completed by auto-negotiation.Wherein SGMII has any different with 1000BASE-SX in terms of page table is consulted, and ability abstraction function is handled differently in the module, it is ensured that can distinguish the ability that SGMII/1000BASE-X is supported by pattern, other are processed and state machine is public.
The responsible unbalanced value for providing single 8B/10B coding modules of the unbalanced value processing unit (sending side) of single channel is processed, and it is the previous output for encoding unbalanced value that concrete principle is the input of next coding.The unbalanced value of previous input is directly given and is encoded next time by single-pass process, as shown in Figure 4.Can show that the process simply needs the register of 1bit from principle analysis as above, logical resource is almost negligible.
SGMII/1000BASE-X Physical Coding Sublayers receiving side mainly includes single channel alignment code detector unit, the unbalanced value computing unit of single channel, the basic receiving units of PCS.The basic receiving units of PCS include 8B/10B decoder modules, standard user equipment module.
Single channel alignment code detector unit:Mainly alignment code is found out from the data flow of SERDES receiving sides 1, alignment of data is carried out into the state before parallel-serial conversion for sending side.Because serial bit stream has been disturbed through the string value data boundary that the process of SERDES receiving sides 1 recovers, so the process is the border for needing to retrieve 10bit data, it is requisite.Can show that the process needs the register of 40bit or so from principle analysis as above.
The unbalanced value computing unit (receiving side) of single channel:Be responsible for provide single channel 8B/10B decoder modules unbalanced value process, concrete principle be next decoding operate unbalanced value input be the unbalanced value of previous decoding operate output.The unbalanced value of previous input is directly given and is decoded next time by single-pass process.If sending side code error or link is unstable causes data flow anomaly, receiving side to be easier to detect mistake according to unbalanced value inspection.
8B/10B decoder modules:Mainly the data after alignment are carried out with 8B/10B decoding operates, period also needs to detect the unbalanced value correctness of decoding data, coding code character correctness, the mistake of control code legitimacy, finally 10bit data is reverted to into 8bit ordered sets again.8bit data flows can be again descapsulated into the data of GMII patterns through user equipment resume module, while needing to detect that whether various control characters meet with agreement, detecting underproof ordered set code character needs to stamp error flag.
Standard user equipment module:Realize standard 802.3-2008_section3Figure36-7a, the Figure 36-7b of IEEE.To carrying out decapsulation operation through the decoded data of 8B/10B, including removal opening code/S/, end code/T/, reduction bell idles/I/, the correctness for detecting code character encapsulation is needed simultaneously, error flag is stamped for illegal encapsulation of data stream and sends MAC layer back to via GMII.Simultaneously needs provide link synchronization state instruction according to the synchronous state machine of the standard 802.3-2008_section3Figure 36-9 of code character combinations of states standard IEEE.
As shown in Fig. 2 showing the processing structure figure of the Physical Coding Sublayer of QSGMII in figure.
The data that QSGMII Physical Coding Sublayers sending side sends MAC layer sending side 0, MAC layer sending side 1, MAC layer sending side 2, MAC layer sending side 3 through 4 sets of GMII replace insertion and coded treatment while doing ordered set, wherein the 1st article passage needs to do ordered set code character and especially processes (K28.5 code characters are replaced with into K28.1 code characters), and bit width is changed into 4 × 10bit from 4 × 8bit extensions after coding.Physical Coding Sublayer by the data flow of 4 × 10bit with 125Mhz outputs to SERDES sending sides 2, parallel-serial conversion is done to parallel data and is converted into serial bit stream outputs by SERDES sending sides 2.
Now actual speed rate is 4 × 10bit × 125Mhz=5Gbps, and it is 5Gpbs × 8/10=4Gbps that effective speed is the expense of removing 8B/10B codings.Its corresponding SERDES sending side 2 and SERDES receiving sides 2 only need fixation to be operated in the tupe of 40bit bit wides from the point of view of Physical Coding Sublayer for single QSGMII.Note SERDES2 sending sides and receiving side bit wide reality or 40bit, simply now fixation is operated under the whole effectively patterns of 40bit.
QSGMII Physical Coding Sublayers receiving side is received and comes from the 40bit parallel datas that SERDES receiving sides 2 are recovered through serioparallel exchange, decoding operate is done after passage is realigned, wherein the 1st article passage needs, to K28.1 is reduced to into K28.5 code characters to carry out ordered set decapsulation process, to remove and send the data-stream form that data stream recovery is 4 sets of GMII back to MAC layer receiving side 0, MAC layer receiving side 1, MAC layer receiving side 2, MAC layer receiving side 3 after ordered set code character.
QSGMII Physical Coding Sublayers sending side mainly includes the unbalanced value computing unit of the basic transmitting element of 4 PCS, 4 passages and K28.1 code character replacement units.
K28.1 code character replacement units are mainly used for replacing the K28.5 code characters of the 1st passage, detect that K28.1 code characters, with the data boundary of alignment channel, are the peculiar processing modes of QSGMII in order to receiving side.
The basic transmitting element structures of PCS are as it was previously stated, QSGMII sending sides need to use the basic transmitting element of 4 PCS, including the basic sending side 3 in the basic sending side 2, PCS in the basic sending side 1, PCS in the basic sending sides 0, PCS of PCS.
The unbalanced value computing unit (sending side) of 4 passages:Because 4 passage code characters are propagated using same SERDES in link propagation, then unbalanced value actually needs to represent this 4 interchannel relevances, then unbalanced value is processed before and after just only should not doing in 1 passage and propagated.It is to need the block transmission of previous channel coding to the code character of next channel coding in implementing, has been achieved in that the relevance of different interchannel codings.It is embodied as theory structure as shown in Figure 5.
QSGMII Physical Coding Sublayers receiving side mainly includes the unbalanced value computing unit of the basic receiving unit of 4 PCS, 4 passages and 4 passages alignment code detector unit.
The basic receiving unit structures of PCS are as it was previously stated, QSGMII receiving sides need to use the basic receiving unit of 4 PCS to include the basic receiving side 3 of the basic receiving side 2, PCS of the basic receiving side 1, PCS of the basic receiving sides 0, PCS of PCS.
K28.1 code character reduction units are after the data boundary alignment for 4 passages of wait, the K28.1 code characters of the 1st passage are reverted to into K28.5 code characters again, QSGMII state machines processing module and the original SGMII/1000BASE-X of such receiving side can share a set for the treatment of mechanism.
The unbalanced value computing unit (receiving side) of 4 passages:Because the code character of 4 passages in link propagation is propagated using same SERDES, then unbalanced value actually needs to represent this 4 interchannel associations.As long as so there is a channels operation incorrect, the unbalanced value that can cause other 4 passages propagates incorrect, causes all channel-decodeds to malfunction.Implementing structure can see Fig. 5.
4 passages alignment code detector unit mainly finds out alignment code from SERDES data flows, and alignment of data is carried out into the state before parallel-serial conversion for sending side.Compared to single pass process, align in 4 passages and not only illustrate only the border of each channel parallel data, while being also the boundary point of every channel data segmentation.When the position determines, the data of so all passages have all been aligned.If the contrary position judgment mistake, can cause the confusion of all channel datas.
Can see that QSGMII is actually slightly adjusted in the structure of 4 sets of SGMII.Analysis from before obtains SGMII and can essentially use the basic transmitting elements of 1 PCS therein of QSGMII and the basic receiving unit of 1 PCS, adds the unbalanced value computing unit (sending side) of single channel, the unbalanced value computing unit (receiving side) of single channel, single channel and aligns code detector unit to obtain.So can be by QSGMII structure of modification such as Fig. 3, as QSGMII/SGMII/1000BASE-X mixing PCS processing structure figures.SERDES sending sides 3 cannot now be fixed with SERDES receiving sides 3 and work in 10bit effectively or 40bit effective models in Fig. 3, the work bit wide that now SERDES3 sending sides and receiving side are determined according to control signal (pcs_mod) now is needed, the i.e. achievable multi-mode mixing PCS of module variations for so coordinating PCS layers is realized.
As shown in figure 3, the mixing Physical Coding Sublayer of the embodiment of the present invention includes:Sending module 31, the sending module 31 includes:
The basic transmitting element 311 of 4 Physical Coding Sublayer PCS, the data for sending to 44 sets of medium access control MAC layer sending side gigabit GMII GMII replace insertion and coded treatment while doing ordered set;
Code character replaces select unit 312, for after coded treatment, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.5 code characters of first passage being replaced with into K28.1 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, replacement process is not made;
Unbalanced value calculation processing unit 313, for the unbalanced value when mixing Physical Coding Sublayer is operated in 4 passage scene, needed for being processed using the unbalanced value calculation code of 4 passages;For the unbalanced value when mixing Physical Coding Sublayer is operated in single channel scene, needed for being processed using the unbalanced value calculation code of single channel.
The basic transmitting elements 311 of each PCS include:
Standard sends state machine module (not shown), and for the data that the MAC layer sending side Jing GMII of a passage send to be done into ordered set insertion process is replaced, and it is the code character form encoded suitable for 8B/10B to encapsulate data;
8B/10B coding module (not shown)s, for sending the code stream that state machine module is handled well to standard 8B/10B coded treatments are carried out, wherein, 8B/10B coded treatments need unbalanced value as input;SERDES sending sides are sent data to after coded treatment and does parallel data to the conversion of serial data;
Auto-negotiation processing module (not shown), for completing the Capacity Coordination operation at communication two ends by auto-negotiation.
The code character replaces select unit 312, is additionally operable to according to control signal, chooses whether for the K28.1 code characters of first passage to replace with K28.5 code characters;
The unbalanced value calculation processing unit 313, is additionally operable to according to control signal, and the unbalanced value calculation code of the passage of Selection utilization 4 processes required unbalanced value, or the unbalanced value needed for processing using the unbalanced value calculation code of single channel.
Can see in Fig. 3, for the processing mode that original QSGMII is realized, it is main that model selection is added to several modules for needing to distinguish single channel and the process of 4 passages, represent that current PC S needs to be operated under 4 passage scenes or under single channel scene using pcs_mod signals.So the processing method that can be operated under 3 kinds of arbitrary patterns is just drawn by the structure similarities and differences of labor QSGMII and SGMII/1000BASE-X.
As shown in figure 3, the mixing Physical Coding Sublayer of another embodiment of the present invention includes:Receiver module 32, the receiver module 32 includes:
Alignment code detection process unit 321, for when mixing Physical Coding Sublayer is operated in 4 passage scene, the alignment of data that will be sent from SERDES being detected using 4 passages alignment code;When mixing Physical Coding Sublayer is operated in single channel scene, the alignment of data that will be sent from SERDES using single channel alignment code detection;
Code character reduces select unit 322, for after alignment of data, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.1 code characters of first passage being reverted to into K28.5 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, reduction treatment is not made;
The basic receiving unit 323 of 4 PCS, to after alignment of data, doing decoding process to the data of 4 passages and removing ordered set code character, data-stream form of the data stream recovery for GMII is sent to 4 MAC layer receiving sides;
Unbalanced value calculation processing unit 324, for when mixing Physical Coding Sublayer is operated in 4 passage scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of 4 passages;For when mixing Physical Coding Sublayer is operated in single channel scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of single channel.
The basic receiving units 323 of each PCS include:
8B/10B decoder module (not shown)s, for carrying out 8B/10B decoding operates to the data after alignment;
Standard user equipment module (not shown), for removing ordered set code character through the decoded data of 8B/10B, data-stream form of the data stream recovery for GMII being sent to MAC layer receiving side.
The code character reduces select unit 322, is additionally operable to the alignment of data that will be sent from SERDES according to control signal, the alignment code detection of the passage of Selection utilization 4 or single channel alignment code detection;
The unbalanced value calculation processing unit 324, is additionally operable to according to control signal, and the unbalanced value of the passage of Selection utilization 4 calculates the unbalanced value needed for decoding process, or the unbalanced value needed for decoding process is calculated using the unbalanced value of single channel.
As shown in figure 3, the mixing Physical Coding Sublayer of another embodiment of the present invention includes above-mentioned sending module 31 and receiver module 32.The mixing Physical Coding Sublayer of Fig. 3 is mainly replaced to the code character of former QSGMII processing structures and has done selection process with reduction select unit, unbalanced value calculation processing unit, yard detection process unit that aligns.
Alignment code detection process unit combines 4 passages alignment code detector unit and aligns with single channel a yard detector unit, is determined to be processed using which unit according to pcs_mod.
Unbalanced value calculation processing unit combines the unbalanced value computing unit of 4 passages and the unbalanced value computing unit of single channel, is determined to be processed using which unit according to pcs_mod.
Decide whether that the code character for being former K28.1 is replaced and restoring operation according to pcs_mod.When QSGMII patterns (i.e. 4 channels operation scenes) are operated in, the operation of K28.1 code characters is as it was previously stated, when SGMII/1000BASE-X patterns (i.e. single channel operative scenario) is operated in, output is clapped in direct pipelining delay one.
Fig. 6 is the schematic flow sheet of the data transmission method for uplink of the mixing Physical Coding Sublayer of the embodiment of the present invention, as shown in fig. 6, the data transmission method for uplink of the mixing Physical Coding Sublayer is comprised the following steps:
Step 601:The data that receiving mac layer sending side is sent by GMII.
Step 602:The data are carried out with ordered set and replaces insertion and coded treatment, wherein, when carrying out coded treatment, when mixing Physical Coding Sublayer is operated in 4 passage scene, unbalanced value needed for being processed using the unbalanced value calculation code of 4 passages, unbalanced value when mixing Physical Coding Sublayer is operated in single channel scene, needed for being processed using the unbalanced value calculation code of single channel.
Specifically, the data that the MAC layer sending side Jing GMII of a passage send are done into ordered set and replaces insertion process, it is the code character form encoded suitable for 8B/10B to encapsulate data;
Code stream to handling well carries out 8B/10B coded treatments, wherein, 8B/10B coded treatments need unbalanced value as input.
Afterwards, the Capacity Coordination operation at communication two ends is completed by auto-negotiation.
Step 603:When mixing Physical Coding Sublayer and being operated in 4 passage scene, the K28.5 code characters of first passage are replaced with into K28.1 code characters, and send to SERDES sending sides and do parallel data to the conversion of serial data;When mixing Physical Coding Sublayer is operated in single channel scene, do not make replacement process, directly send data to SERDES sending sides and do parallel data to the conversion of serial data.
Fig. 7 is the schematic flow sheet of the data receiver method of the mixing Physical Coding Sublayer of the embodiment of the present invention, as shown in fig. 7, the data receiver method of the mixing Physical Coding Sublayer is comprised the following steps:
Step 701:When mixing Physical Coding Sublayer is operated in 4 passage scene, the alignment of data that will be sent from SERDES using the alignment code detection of 4 passages;When mixing Physical Coding Sublayer is operated in single channel scene, the alignment of data that will be sent from SERDES using single channel alignment code detection.
Step 702:After alignment of data, when mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.1 code characters of first passage are reverted to into K28.5 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, reduction treatment is not made.
Step 703:After alignment of data, decoding process is done to the data of 4 passages and ordered set code character is removed, data-stream form of the data stream recovery for GMII is sent to 4 MAC layer receiving sides;Wherein, when mixing Physical Coding Sublayer is operated in 4 passage scene, the unbalanced value needed for decoding process is calculated using the unbalanced value of 4 passages;For when mixing Physical Coding Sublayer is operated in single channel scene, the unbalanced value needed for decoding process being calculated using the unbalanced value of single channel.
Specifically, 8B/10B decoding operates are carried out to the data after alignment;To removing ordered set code character through the decoded data of 8B/10B, data-stream form of the data stream recovery for GMII is sent to MAC layer receiving side.
Realize that logical resource increased about 62bit registers and 32 are selected 1 selector resource compared to original QSGMII, compared to former overall logic consumption, the resource of increase is very little, does not almost increase any extra resource consumption.Compared to the process of 4 passages, the unbalanced value computing unit (sending side) of single channel, the unbalanced value computing unit (receiving side) of single channel, the function phase of single channel alignment code detector unit are to simple many, increase the resource that these modules have increased about 1% on former QSGMII logical foundations accordingly, be almost negligible.Compared to the resource consumption that the Physical Coding Sublayer design for directly adding QSGMII using SGMII/1000BASE-X can at least save 1/4.
Also there are other Patents technologies to have the realization of multi-mode Ethernet architecture at present, but the mentality of designing and new framework that focal point is complexity is processed, and is not but had in the durability in view of the similitude and resource of QSGMII and SGMII/1000BASE-X structures.For several processing methods can be summarized as in the process of various ether patterns:
Using the Physical Coding Sublayer of multiple different rates, select before into SERDES, reach and realize the cooperative purpose of various speed.This kind of processing mode it is larger waste resource, it is relatively costly.
Using non-standard process, big bandwidth frequency dividing is multiplexed in little speed.The interface of such as 1 1Gbps speed is actually used in the interface of 10 100Mbps of transmission.So actually similar to the processing method of QSGMII, that is, 10 100M interfaces, all using for 1G, single 100M interfaces exclusive use as realizes 100M.This kind of processing mode shortcoming be not standard interface, it is impossible to dock with 100M standard interfaces.QSGMII of the present invention works in single and although also achieves speed for 1Gbps, but individually QSGMII is cannot to dock (although speed is consistent) with SGMII, so the present invention realizes the function of QSGMII/SGMII by resource multiplex simultaneously.
Compared to remaining prior art, the labor of the present invention similarities and differences of several modes structures, the multiplexing of logical resource of ingenious and ultrahigh in efficiency carrying out, reach and realized that the process of inexpensive multi-mode Physical Coding Sublayer port is realized, externally supported 1000BASE-SX/SGMII/QSGMII to meet the application demand of different scenes and docked with the interface of different manufacturers.
It is to be appreciated that although this specification has carried out specific description according to embodiment, some CONSTRUCTED SPECIFICATIONs can be formed after proper transformation, also with ins and outs it will be appreciated by those skilled in the art that other embodiment.Foregoing detailed description is only for the feasibility embodiment of the present invention and illustrates, and is not intended to limit protection scope of the present invention, all equivalent implementations without departing from spirit of the present invention or changes within the scope of the present invention.

Claims (12)

1. it is a kind of to mix Physical Coding Sublayer, it is characterised in that the mixing Physical Coding Sublayer includes:Send out Module, the sending module is sent to include:
The basic transmitting element of 4 Physical Coding Sublayer PCS, for 4 medium access control MAC layers Data that 4 sets of sending side gigabit GMII GMII sends at the same do ordered set replace insertion and Coded treatment;
Code character replaces select unit, for after coded treatment, leading to when mixing Physical Coding Sublayer is operated in 4 During road scene, the K28.5 code characters of first passage are replaced with into K28.1 code characters;When mixing Physical Coding Sublayer When being operated in single channel scene, replacement process is not made;
Unbalanced value calculation processing unit, for when mix Physical Coding Sublayer be operated in 4 passage scene when, Unbalanced value needed for being processed using the unbalanced value calculation code of 4 passages;For when mixing Physical Coding Sublayer Unbalanced value when being operated in single channel scene, needed for being processed using the unbalanced value calculation code of single channel.
2. mixing Physical Coding Sublayer according to claim 1, it is characterised in that each PCS base This transmitting element includes:
Standard sends state machine module, for the number for sending the MAC layer sending side Jing GMII of a passage Insertion process is replaced according to ordered set is done, it is the code character form encoded suitable for 8B/10B to encapsulate data;
8B/10B coding modules, for sending the code stream that state machine module is handled well to standard 8B/10B is carried out Coded treatment, wherein, 8B/10B coded treatments need unbalanced value as input;By data after coded treatment Send to SERDES sending sides and do parallel data to the conversion of serial data;
Auto-negotiation processing module, for completing the Capacity Coordination operation at communication two ends by auto-negotiation.
3. mixing Physical Coding Sublayer according to claim 1 and 2, it is characterised in that
The code character replaces select unit, is additionally operable to according to control signal, chooses whether first passage K28.1 code characters replace with K28.5 code characters;
The unbalanced value calculation processing unit, is additionally operable to according to control signal, and the passage of Selection utilization 4 is uneven Unbalanced value needed for the process of weighing apparatus value calculation code, or process institute using the unbalanced value calculation code of single channel The unbalanced value for needing.
4. it is a kind of to mix Physical Coding Sublayer, it is characterised in that the mixing Physical Coding Sublayer includes:Connect Module is received, the receiver module includes:
Alignment code detection process unit, it is sharp for when mixing Physical Coding Sublayer is operated in 4 passage scene The alignment of data that will be sent from SERDES with the alignment code detection of 4 passages;When mixing Physical Coding Sublayer work In single channel scene, the alignment of data that will be sent from SERDES using single channel alignment code detection;
Code character reduces select unit, for after alignment of data, leading to when mixing Physical Coding Sublayer is operated in 4 During road scene, the K28.1 code characters of first passage are reverted to into K28.5 code characters;When mixing Physical Coding Sublayer When being operated in single channel scene, reduction treatment is not made;
The basic receiving unit of 4 PCS, to after alignment of data, decoding process is done to the data of 4 passages with And ordered set code character is removed, data stream recovery is sent to 4 MAC layers for the data-stream form of GMII and is connect Receive side;
Unbalanced value calculation processing unit, for when mix Physical Coding Sublayer be operated in 4 passage scene when, The unbalanced value needed for decoding process is calculated using the unbalanced value of 4 passages;For when mixing Physical Coding Sublayer When being operated in single channel scene, the unbalanced value needed for decoding process is calculated using the unbalanced value of single channel.
5. mixing Physical Coding Sublayer according to claim 4, it is characterised in that each PCS base This receiving unit includes:
8B/10B decoder modules, for carrying out 8B/10B decoding operates to the data after alignment;
Standard user equipment module, for removing ordered set code character through the decoded data of 8B/10B, Data-stream form of the data stream recovery for GMII is sent to MAC layer receiving side.
6. the mixing Physical Coding Sublayer according to claim 4 or 5, it is characterised in that
The code character reduces select unit, is additionally operable to according to control signal, the alignment code inspection of the passage of Selection utilization 4 Survey or single channel alignment code detects the alignment of data that will be sent from SERDES;
The unbalanced value calculation processing unit, is additionally operable to according to control signal, and the passage of Selection utilization 4 is uneven Weighing apparatus value calculates the unbalanced value needed for decoding process, or calculates decoding process institute using the unbalanced value of single channel The unbalanced value for needing.
7. it is a kind of to mix Physical Coding Sublayer, it is characterised in that the mixing Physical Coding Sublayer includes right Require the sending module described in 1 to 3 any one, and the reception mould described in any one of claim 4 to 6 Block.
8. it is a kind of mixing Physical Coding Sublayer data transmission method for uplink, it is characterised in that methods described includes:
The data that receiving mac layer sending side is sent by GMII;
The data are carried out with ordered set and replaces insertion and coded treatment, wherein, when carrying out coded treatment, When mixing Physical Coding Sublayer is operated in 4 passage scene, processed using the unbalanced value calculation code of 4 passages Required unbalanced value, it is uneven using single channel when mixing Physical Coding Sublayer is operated in single channel scene Unbalanced value needed for the process of weighing apparatus value calculation code;
When mixing Physical Coding Sublayer is operated in 4 passage scene, the K28.5 code characters of first passage are replaced For K28.1 code characters, and send to SERDES sending sides and do parallel data to the conversion of serial data;When mixed When conjunction Physical Coding Sublayer is operated in single channel scene, do not make replacement process, directly send data to SERDES does sending side parallel data to the conversion of serial data.
9. it is according to claim 8 mixing Physical Coding Sublayer data transmission method for uplink, it is characterised in that The ordered set that carries out to the data replaces insertion and coded treatment, including:
The data that the MAC layer sending side Jing GMII of one passage send are done into ordered set and replace insertion process, It is the code character form encoded suitable for 8B/10B to encapsulate data;
Code stream to handling well carries out 8B/10B coded treatments, wherein, 8B/10B coded treatments need inequality Weighing apparatus value is used as input.
10. the data transmission method for uplink of mixing Physical Coding Sublayer according to claim 8, its feature exists In methods described also includes:
The Capacity Coordination operation at communication two ends is completed by auto-negotiation.
A kind of 11. data receiver methods of mixing Physical Coding Sublayer, it is characterised in that methods described includes:
When mixing Physical Coding Sublayer and being operated in 4 passage scene, will be from using the alignment code detection of 4 passages The alignment of data that SERDES sends;When mixing Physical Coding Sublayer is operated in single channel scene, using list The alignment of data that passage alignment code detection will send from SERDES;
After alignment of data, when mixing Physical Coding Sublayer is operated in 4 passage scene, by first passage K28.1 code characters revert to K28.5 code characters;When mixing Physical Coding Sublayer is operated in single channel scene, no Make reduction treatment;
After alignment of data, decoding process is done to the data of 4 passages and ordered set code character is removed, by data Stream reverts to the data-stream form of GMII and sends to 4 MAC layer receiving sides;Wherein, when mixing physics is compiled When numeral layer is operated in 4 passage scene, calculate unbalanced needed for decoding process using the unbalanced value of 4 passages Value;For when mixing Physical Coding Sublayer is operated in single channel scene, being calculated using the unbalanced value of single channel Unbalanced value needed for decoding process.
The data receiver method of 12. mixing Physical Coding Sublayers according to claim 11, its feature exists In, it is described after alignment of data, decoding process is done to the data of 4 passages and ordered set code character is removed, will Data stream recovery is sent to 4 MAC layer receiving sides for the data-stream form of GMII, including:
8B/10B decoding operates are carried out to the data after alignment;To removing through the decoded data of 8B/10B Ordered set code character, data-stream form of the data stream recovery for GMII is sent to MAC layer receiving side.
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