Appendix B: Backward Compatibility 57 (114)
RMII Compatibility
If the RMII mode is being used on an Anybus CompactCom 40 module and it is desired to
remain 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
CompactCom 40 is detected. In case the RMII connection cannot be disabled through an
internal hardware 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),
Section 3.2.5, “RMII — Reduced Media-Independent Interface”.
Anybus
®
CompactCom
™
M40 Hardware Design Guide HMSI-216-126 EN 2.6
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