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DP83849C: The role of the MII RX_ER signal in 10 Mbits/s mode

Part Number: DP83849C

Dear DP83894C experts,

The spec says the following about the MII RX_ER

"MII RECEIVE ERROR: Asserted high synchronously to RX_CLK to
indicate that an invalid symbol has been detected within a received
packet in 100 Mb/s mode."

It does not elaborate on the role of that signal in 10 Mbits/s mode.

1) Does that imply that is  has no role in 10 Mbits/s mode ?

2) Is the default value of that signal high, and is only set to 0 upon a no RX_ER detection ? If so won't it interfere with teh 10 Mbits/s mode ?

Kind regards,

Rocco