CN103630987A - CFP (centum form factor pluggable) optical module and MDIO (management data input/output) interface circuit thereof - Google Patents
CFP (centum form factor pluggable) optical module and MDIO (management data input/output) interface circuit thereof Download PDFInfo
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Abstract
The invention discloses a CFP (centum form factor pluggable) optical module and an MDIO (management data input/output) interface circuit thereof. The MDIO interface circuit comprises a CPLD (complex programmable logic device) module and an MCU (micro-controller unit) control circuit, wherein the CPLD module is used for being connected with a switch system board through an MDIO bus and a management interface address line, and being in MDIO communication with the switch system board, the CPLD module is connected with the MCU control circuit through an interrupt control line, a function selecting line and a parallel data line, the interrupt control line is used for controlling the MCU control circuit to respond to the MDIO communication, the function selecting line is used for judging the read-write type or the address operating type of the MDIO communication by the MCU control circuit, and the parallel data line is used between the CPLD module and the MCU control circuit for transmitting MDIO communication data. After the technical scheme disclosed by the invention is applied, the MDIO communication between the CFP optical module and a switch can be realized.
Description
Technical field
The present invention relates to optical communication technique field, particularly relate to a kind of CFP(Centum Form Factor Pluggable, 100G can plug encapsulation) optical module and MDIO(Management Data Input/output thereof, management data input and output) interface circuit.
Background technology
CFP optical module is that a kind of speed is the transceiver module that 40G/100G carries out opto-electronic conversion, adopt the MAC(Media Access Control of MDIO interface and switch system plate, medium access control) layer communicates, for transmitting the control and management information of MAC layer to Physical layer (PHY).
At present, the control section of CFP optical module, generally by MCU(Micro-Controller Unit, micro controller unit) realize.Yet in MCU chip, all there is no integrated MDIO interface, therefore, cannot with MCU, realize separately the MDIO interface of CFP optical module.
Summary of the invention
Based on this, be necessary to provide a kind of MDIO interface circuit, a kind of CFP optical module, apply this interface circuit and CFP optical module, can realize CFP optical module and communicate by letter with the MDIO between switch.
A MDIO interface circuit, comprises CPLD module and MCU control circuit; Described CPLD module, for being connected switch system plate by MDIO bus with management interface address wire, is carried out MDIO with described switch system plate and is communicated by letter; Described CPLD module selects line, interruption control line, parallel data line to connect described MCU control circuit by function; Described function selects line for read-write type or the address function type of described MCU control circuit judgement MDIO communication; Described interruption control line is used for controlling described MCU control circuit, and to MDIO, communication responds; Described parallel data line, for transmitting MDIO communication data between described CPLD module and MCU control circuit.
In an embodiment, described MCU control circuit comprises ADUC7027 control chip therein.
In an embodiment, described CPLD module comprises LC4064ZE chip therein;
Described CPLD module further comprises level shifting circuit, for the MDIO bus to described CPLD module, management interface address wire, carries out level conversion.
In an embodiment, described level shifting circuit comprises MAX3378 level transferring chip therein.
A CFP optical module, comprises MDIO interface circuit, switch system plate connectivity port and physical chip;
Described MDIO interface circuit is aforementioned any MDIO interface circuit;
Described switch system plate connectivity port, for connecting switch system plate;
Described CPLD module, is connected described switch system plate connectivity port with management interface address wire by MDIO bus;
Described MCU control circuit, connects described switch system plate connectivity port by state control line;
Described physical chip connects described MCU control circuit by control line, and connects described switch system plate connectivity port by data line.
In an embodiment, described data line is single-mode fiber or multimode optical fiber therein.
Above-mentioned MDIO interface circuit, CFP optical module, adopt CPLD in conjunction with the mode of MCU, wherein CPLD module is connected switch system plate by MDIO bus with management interface address wire, CPLD selects line by function, interrupt control line, parallel data line connects MCU control circuit, at switch system plate and CPLD, carry out MDIO while communicating by letter, by function, select line to inform MCU read-write type or address function type, by interrupting control line, by MCU, prepare to carry out parallel data transmission with CPLD, by parallel data line, carry out again the transmission of MDIO data, thereby realize the MDIO communication of CFP optical module.
Accompanying drawing explanation
Fig. 1 is the structural representation of a MDIO interface circuit in embodiment;
Fig. 2 is the structural representation of a CFP optical module in embodiment.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, in one embodiment, provide a kind of MDIO interface circuit, comprise CPLD(Complex Programmable Logic Device, CPLD) module 102 and MCU control circuit 104.CPLD module 102 is for being connected switch system plate by MDIO bus with management interface address wire, carrying out MDIO with switch system plate communicates by letter, wherein in the present embodiment, management interface address wire comprises ADDR0 to ADDR4 totally 5 address input lines, and MDIO bus comprises MDO clock input line and MDIO serial input output data line (not shown).CPLD module 102 selects line (concrete, to comprise OP0 to OP3), interruption control line (INT), parallel data line (D0 to D15) to connect MCU control circuit 104 by function.Function selects line for the read-write type of MCU control circuit judgement MDIO communication or address function type (comprise register address that MCU obtains MDIO signal post and will operate, current register address is added to 1 operation).Interruption control line is used for controlling MCU control circuit, and to MDIO, communication responds, and prepares reception or the transmission of parallel data.Parallel data line, for transmitting MDIO communication data between CPLD module 102 and MCU control circuit 104.
Further, in the present embodiment, MCU chip can be selected ADUC7027, and it mainly realizes read-write type and the address function type of MDIO communication, and reception or the transmission of by parallel data line, carrying out data, based on CFP MSA agreement, carry out address assignment and data management.When MDIO interface circuit is applied to CFP optical module, MCU connects physical chip, can obtain the state of physical chip and store, and start control information to physical chip.
In the present embodiment, CPLD can adopt LC4064ZE.CPLD and switch system plate carry out MDIO serial data communication, and between CPLD and MCU, are to carry out parallel data communication, so CPLD inside realized string translation function, specifically can realize by verilog HDL programming.
In addition, in the present embodiment, because the pin operating voltage of LC4064ZE is 3.3V, and the MDIO communication level of CFP agreement regulation adopts 1.2V LVCMOS standard, therefore in CPLD module, also comprised level shifting circuit, the MDIO bus on LC4064ZE chip, management interface address wire pin are carried out to level conversion, level transferring chip can be, but not limited to use MAX3378 level transferring chip.
The MDIO interface circuit that the present embodiment provides, adopt CPLD in conjunction with the mode of MCU, wherein CPLD module is connected switch system plate by MDIO bus with management interface address wire, CPLD selects line by function, interrupt control line, parallel data line connects MCU control circuit, at switch system plate and CPLD, carry out MDIO while communicating by letter, by function, select line to inform MCU read-write type or address function type, by interrupting control line, by MCU, prepare to carry out parallel data transmission with CPLD, by parallel data line, carry out again the transmission of MDIO data, can be applied in CFP optical module, realize MDIO communication.
Referring to Fig. 2, in one embodiment, provide a kind of CFP optical module, comprise MDIO interface circuit, switch system plate connectivity port 206 and physical chip 208.
Wherein, MDIO interface circuit is the MDIO interface circuit in previous embodiment, comprise CPLD module 202 and MCU control circuit 204, CPLD module selects line (OP0-OP3), interruption control line (INT), parallel data line (D0-D15) to connect MCU control circuit by function.
Switch system plate connectivity port 206, for connecting switch system plate 300.Switch system plate 300 carries out opto-electronic conversion, by MDIO interface circuit, read the state of physical chip 208, and send control information to physical chip by MDIO interface circuit, and by data line (Txn, Rxn, can be single-mode fiber or multimode optical fiber) and physical chip carry out up to 40G/s, the data receiver of 100G/s or transmission, for example n value can get 4 in one embodiment, the speed of data line Tx or Rx is 10G/s, can realize the data transmission of 40G/s, if in like manner Tx or Rx transfer rate are 25G/s, can realize the data communication of 100G/s.
Concrete, the MDIO interface circuit that mode was provided with CPLD in conjunction with MCU, while being applied in this CFP optical module, principle of work is as follows:
Table 1:MDIO serial data format
Wherein, when start bit (2bit) is continuous two low level, when " 00 ", representative starts a MDIO communication, otherwise is the MDIO idle condition of communicating by letter, and MDIO serial input output data line is high-impedance state.
OP0 and OP1 correspondence read-write type or address function type.Concrete, when OP0, OP1 are " 00 ", representing to inform the register address that MCU will operate, in MDIO serial data, the address of 16 is the register address that will operate.When OP0, OP1 are " 01 ", represent to carry out data write operation, MCU will write MDIO communication data to the front register that once obtains address.When OP0, OP1 are " 11 ", represent to carry out data reading operation, MCU will read MDIO communication data to the front register that once obtains address.When OP0, OP1 are " 01 ", represent that carrying out address adds 1 operation, MCU will add 1 to current register address, to carry out data write or read next time.
In the present embodiment, type of device (5bit) acquiescence is " 00001 ".If in MDIO serial data, this 5 bit data is not inconsistent, and CPLD will be made as high-impedance state MDIO serial input output data line.
Thus, in the CFP optical module in the present embodiment, the mode by CPLD in conjunction with MCU, has realized MDIO communication, can make switch system plate MAC layer can obtain the state of physical chip, and send control information to physical chip.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (6)
1. a MDIO interface circuit, is characterized in that, comprises CPLD module and MCU control circuit; Described CPLD module, for being connected switch system plate by MDIO bus with management interface address wire, is carried out MDIO with described switch system plate and is communicated by letter; Described CPLD module selects line, interruption control line, parallel data line to connect described MCU control circuit by function; Described function selects line for read-write type or the address function type of described MCU control circuit judgement MDIO communication; Described interruption control line is used for controlling described MCU control circuit, and to MDIO, communication responds; Described parallel data line, for transmitting MDIO communication data between described CPLD module and MCU control circuit.
2. MDIO interface circuit according to claim 1, is characterized in that, described MCU control circuit comprises ADUC7027 control chip.
3. MDIO interface circuit according to claim 2, is characterized in that, described CPLD module comprises LC4064ZE chip;
Described CPLD module further comprises level shifting circuit, for the MDIO bus to described CPLD module, management interface address wire, carries out level conversion.
4. MDIO interface circuit according to claim 3, is characterized in that, described level shifting circuit comprises MAX3378 level transferring chip.
5. a CFP optical module, is characterized in that, comprises MDIO interface circuit, switch system plate connectivity port and physical chip;
Described MDIO interface circuit is the MDIO interface circuit described in claim 1 to 4 any one;
Described switch system plate connectivity port, for connecting switch system plate;
Described CPLD module, is connected described switch system plate connectivity port with management interface address wire by MDIO bus;
Described MCU control circuit, connects described switch system plate connectivity port by state control line;
Described physical chip connects described MCU control circuit by control line, and connects described switch system plate connectivity port by data line.
6. CFP optical module according to claim 5, is characterized in that, described data line is single-mode fiber or multimode optical fiber.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105488004A (en) * | 2015-11-27 | 2016-04-13 | 山东超越数控电子有限公司 | I2C line multiplexing control logic method under startup and shutdown states of server |
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| US20110135312A1 (en) * | 2006-10-13 | 2011-06-09 | Siraj Nour El-Ahmadi | 40g/100g optical transceivers with integrated framing and forward error correction |
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| CN102750253A (en) * | 2012-06-06 | 2012-10-24 | 武汉电信器件有限公司 | Centum form factor pluggable (CFP) optical module and management data input/output (MDIO) interface communication method thereof |
| CN103226533A (en) * | 2013-03-29 | 2013-07-31 | 福建星网锐捷通讯股份有限公司 | Device for extending MDIO (management data input/output) interface through parallel buses and realizing method thereof |
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Patent Citations (5)
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| US20110135312A1 (en) * | 2006-10-13 | 2011-06-09 | Siraj Nour El-Ahmadi | 40g/100g optical transceivers with integrated framing and forward error correction |
| CN201886466U (en) * | 2010-12-15 | 2011-06-29 | 武汉电信器件有限公司 | Seamless transition module from MDIO (management data input output) bus slave computer to SPI (serial peripheral interface) bus |
| CN102521189A (en) * | 2011-12-08 | 2012-06-27 | 北京华源格林科技有限公司 | Method for realizing MDIO (Management Data Input/Output) interface signal transformation through CPLD (Complex Programmable Logic Device) |
| CN102750253A (en) * | 2012-06-06 | 2012-10-24 | 武汉电信器件有限公司 | Centum form factor pluggable (CFP) optical module and management data input/output (MDIO) interface communication method thereof |
| CN103226533A (en) * | 2013-03-29 | 2013-07-31 | 福建星网锐捷通讯股份有限公司 | Device for extending MDIO (management data input/output) interface through parallel buses and realizing method thereof |
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| CN105488004A (en) * | 2015-11-27 | 2016-04-13 | 山东超越数控电子有限公司 | I2C line multiplexing control logic method under startup and shutdown states of server |
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