Anybus CompactCom 40 Network Manual page 133

Appendix G: Backward Compatibility
RMII Compatibility
If the RMII mode is being used on an Anybus CompactCom 40 module and it is desired to re-
main compatible with the 30 series, it is important to disable this connection when switching to
an Anybus CompactCom 30 module due to pin conflicts. The RMII port of the host processor
should be set to tristate by default, and only be enabled if an RMII capable Anybus Compact-
Com 40 is detected. In case the RMII connection cannot be disabled through an internal hard-
ware control on the host processor, it will be necessary to design in external hardware (ie. a
FET bus switch) to prevent short circuits
Related Information: Anybus CompactCom M40 Hardware Design Guide (HMSI-216-126), Sec-
tion 3.2.5, "RMII — Reduced Media-Independent Interface".
Anybus CompactCom 40 EtherNet/IP Transparent Ethernet Network Guide
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SCM-1202-019-EN 1.6