Contribute to spotifylinux development by creating an account on github. How to access non ethernet phy device register over mdio. Masterslave controllers for multigig management interface. The information furnished in this document is provided for reference purposes only for use with marvell products. Mdio was originally defined in clause 22 of ieee rfc802. Clock frequency is obtained by running the timing analysis of lattice design software.
Slave can be wrapped inside a wrapper, for implementation with intel qsys based designs. These registers provide status and control information such as. Additionally, clause 22 mdio only supports 5v tolerant devices and does not have a low voltage option. Is there anyone who has ever implemented ethernet mdio. Integration of smartfusion2 mac driver with the lwip tcpip stack and the freertos operating. Hello at picotech, we wish to have a serial decoding function for the mdio interface defined in ieee 802. Mdio master controller which can be used for both clause 22 and clause 45. Implements an mdio management data inputoutput interface slave. The resultant word is returned in the variable ndata. Management data inputoutput, or mdio, is a 2wire serial bus that is used to manage phys or physical layer devices in media access controllers macs in gigabit ethernet equipment. Ethernet phy configuration using mdio for industrial. Mdio is a management data inputoutput interface defined in ieee 802. These two start of frame pattern provide two totally non overlapping address maps.
Preamble pattern selection through input port for clause 22. The current official release of the mdio component in creator only handles clause 45. Im using ti dsp keystone ii device for 10g ethernet service. The mdio within the pruicss in amic110 implements the 802. The miim should not be confused with the mii interface which is used to interface a phy device to a fast ethernet mac device for the purpose of transferring data packets. Simple wishbone interface for user to implement phy registers. Mdio clause 45 mdio communication protocol mdio clause 22 i2c software program visual i2c serial communication i2c in usbmpckit text. Management data inputoutput mdio, also known as serial management interface smi or. In the original specification, a single mdio interface is able to access up to. The mdio module 120 may also communicate with the ahb master module 122.
The usb2mdio tool includes a launchpad development kit for tis msp430 mcus that is interfaced with a lightweight gui. This is a control line that is driven by the sta, and synchronizes the flow of the data on the mdio line. I have the tlk6002evm and mdio evm boards connected and powered. The smi in the dp83822 device, compatible with ieee 802. Where a phy, or grouping of phys, is an individually manageable entity, known as an mdio manageable device mmd. How to access non ethernet phy device register over mdio bus from user space as the phy device is not an ethenet phy i am a bit confused. Mdcmdio bus on petalinux how to use community forums. Clause 22 specifies the mdio frame format and uses an st code of 01 to access registers. To differentiate between a clause 22 access and a clause 45 access on the mdcmdio signals, the start of frame pattern is 01 for a clause 22 access and 00 for a clause 45 access. It is the users own responsibility to design or build products with the information.
Figure 1 shows a typical application environment of the mdio bus. The pci2ckit has a useful feature called the sequencer. The 10g interface is connected to marvell 10g phy device. The miim is also known as the mdiomdc interface and is typically supported by ethernet phy products industry wide. The dp83867 smi function supports read or write access to the extended register set using registers regcr 0x000dh and addar 0x000eh and the mdio manageable device mmd indirect method defined in ieee 802. The purpose of this extension is to provide the ability to access more device registers while still retaining logical compatibility with the mdio interface defined in clause 22. Mdio is used to connect a management entity and a managed phy for the purposes of controlling the phy and gathering status from the phy. Additionally, support is provided for both continuous and bursted clocks for maximum flexibility. The usb2mdio software tool lets texas instruments ethernet phys access the mdio status and device control registers. Its best if, moving forward we add this new device address argument to the mdio readwrite functions, which means all of the current bus drivers need to be modified. In some applications, the mdio module 120 may not support an mdio clause 22 e. Us20070101043a1 protocol converter to access ahb slave. Mdio clause 22 clause 22 phy registers wishbone rd1074 mdio 3 to 8 bit decoder vhdl ieee format mdio controller lcmxo640c4t100c 8h16 text.
Best regards, david law devendra tripathi software or firmware included or referenced in this document is owned by marvell. Clause 22 defines the mdio communication basic frame format, as. I am using the sonic mdio software to configure and communicate with the two boards. Tis usb2mdio software download help users get up and running faster. The beagle i2cspi protocol analyzer can monitor clause 22 and clause 45 mdio using v2. I read that mdio clause 45 has to be supported by the mdio driver and the mac driver, thats why i tried to apply a patch for supporting clause 45 in macb driver. Mdio clause 45 mdio communication protocol mdio clause 22 i2c software program visual i2c serial communication i2c in usbmpckit.
Mdio support was dropped from data center starting with version 3. When i use clause 22 reads of registers 0x00, i receive an err return. Works with any windows software using dlls see the brochure. Bus timing clause 22 before a register access, phy devices generally require a preamble of 32 ones to be sent by the mac on the mdio line. I build my image with yocto and already tried several kernels 4.
While communicating on the mdio bus 112, the mdio module 120 may support an mdio clause 45 e. Mdio peripheral wishbone compatible lattice semiconductor. Interactive table summarizes results turn the oscilloscope into a protocol. This interface is used in everey etherent phy and switch as the control interface for the attached mac ususally some kind of processor. Intelligent mdio recognition the mdio decoder will automatically detect the bit rate and the use of clause 22 or clause 45, minimizing the required setup time. The following table lists and describes the interface to each function. Delivery types a license is not required for using corev2. The mdio decoder will automatically detect the bit rate and the use of clause 22 or clause 45, minimizing the required setup time.
We are designing a new product that contains a marvell ethernet chip interfacing to a pic only for the purpose of initializing the marvells internal registers via an mdio interface. Mdio clause 45 adds a new argument for accessing phy registers, so that you need the phy address, the device address, and the register address which can now be up to 65,535. The two lines include the mdc line management data clock, and the mdio line management data inputoutput. The mdio interface is a simple, twowire, serial interface, clock and data. In order to address the deficiencies of clause 22, clause 45 was added to the 802. Phy address and device type settings through input port for clause 45. Phy address setting through input port for clause 22. Chapter 1 overview the gmii to rgmii ip core provides the reduced gigabit media independent interface. Its related to ethernet, so i assume others in this forum might have dealt with this issue. The decoder supports both clause 45 and clause 22 legacy decode. Serial mdio interface question hi, i hope this is the right forum.
Management data input output mdio technical background. Rd1194 mdio master and slave controllers lattice semiconductor. The verilog code to handle clause 45 and clause 22 are different, so you would need to have a different mdio component to handle clause 22. Quickstart guide to monitor mdio with beagle analyzer. Data inputoutput mdio interface specified in clause 22. Monitoring mdio with the beagle i2cspi protocol analyzer.
The beagle i2cspi analyzer monitors mdio for both clause 22 and clause 45. I am booting the board and then trying to read the registers, so i believe i should receive the default value 0600. Mdio as originally defined in clause 22 of ieee 802. It is two signal based interface between station management sub20 in our case and a physical layer device phy. What im going to try is to use gpio on the dsp device to access 10g phy clause 45 management port, instead of using 10g mdio on dsp. These roughly mirror many of the mii library functions and are based on code from the sfc driver. In the original specification, a single mdio interface is able to access up to 32 registers in 32 different phy devices. The recognition is automated, and decoding occurs on continuous clocks as well as packetized clock signals. The spi interface is fully configurable on a perdevice basis. Default settings are used during in diamond software for the implementation of the. The mdio interface component supports the management data inputoutput, which is.