RZN1D - EtherCAT PHY

Question

Hi we are using the RZN1D to run ECAT slave using ETH4 and ETH5 ports, 
 We saw on the "RZ_N1_EB_Board_Setup_Notes.VE10.pdf" document section 8 the following remark : 
 
 Limitations: The default assembly of PHY addresses is not compliant with the EtherCAT standard. Solution: Change assembly of PHY address setting (refer chapter 5.1.3) 
 
 Can you explain how the Phy address is impacting the compliance to the ETHERCAT standard?

Andreas Schwope · Accepted Answer

Hi Tsahi, 
 In combination with the RZN1 Expansion board, the RZN1D is able to support 3 EtherCAT ports (see Figure 5.1 EtherCAT Slave Connections in the RZN1 User Manual &ldquo;Ethernet&rdquo;). While the first two ports are on the RZN1D-DB board, the 3rd port is on the Expansion board. 
 According to the indications in document RZ_N1_EB_Board_Setup_Notes.VE10.pdf in chapter 5.1.3 RGMII3 (IC3) , the MDIO address for the Ethernet port 3 (the 3 rd EtherCAT port according to Figure 5.1 above) is 10. On the RZN1D-DB board the two EtherCAT ports have the MDIO addresses 0 and 1. 
 On the other side the EtherCAT specification and recommendations provide the following: 
 The PHY addresses should be equivalent to the logical port number (0-3) . 
 Some ESCs also support a fixed offset (e.g. offset 16, PHY addresses are logical port number plus 16: 16-19), an arbitrary offset, or even individually configurable PHY addresses. If none of these possibilities can be used, the PHY address should be configured to logical port number plus 1 (1-4), ... 
 Please refer to the related EtherCAT documents from the ETG / EtherCAT Technology Group and Beckhoff. The text above is taken from the an_phy_selection_guidev2.7.pdf document: 
 
 EtherCAT PHY Selection Guide 
 Requirements to Ethernet PHYs used for EtherCAT &hellip; 
 
 You see, with the provided MDIO addresses 0, 1 and 10 for the 3 EtherCAT ports on the RZN1D-DB+Expansion you cannot fulfil the EtherCAT requirements for consecutive MDIO addresses. 
 
 Additional note: Please also download the latest RZN1 Solution Kit package from our website. The document name "RZ_N1_EB_Board_Setup_Notes. VE10 .pdf" is indicating that you are using an older version. The current version is VE20 .

RZN1D - EtherCAT PHY

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