OYTIS
Newbie level 3
Hello everyone!
I'm using Spansion FM3 series microcontroller (namely MB9BFD18T) to connect to ethernet using RMII interface (MII is also supported by the MCU). After long time of debugging I noticed that all my transmitted ethernet frames are exactly twice as short as they should be. Then I probed RMII Tx data pins with an oscilloscope and found out that every high nibble is lost, including the preamble. That is: if, for example I send
what I see on RMII is:
If it was MII/RMII issue, one would expect that every two (not four) bytes will be lost.
Any ideas? Maybe someone experienced similar problem?
I'm using Spansion FM3 series microcontroller (namely MB9BFD18T) to connect to ethernet using RMII interface (MII is also supported by the MCU). After long time of debugging I noticed that all my transmitted ethernet frames are exactly twice as short as they should be. Then I probed RMII Tx data pins with an oscilloscope and found out that every high nibble is lost, including the preamble. That is: if, for example I send
Code:
54 04 A6 6E DB 3E 00 00
Code:
44 6E BE 00Any ideas? Maybe someone experienced similar problem?