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DP83630 RMII IF Preamble reduction

Other Parts Discussed in Thread: DP83630Dear Specialist. I have a question about DP83630 RMII preamble length. Most commonly used preamble is 7bytes. But some time, phy reduce preamble size.(I mean 6bytes or 5bytes) Does DP83630 also reduce preamble size? And if yes, does DP83630 reduce preamble in 2bit units or 4bits or 8bits? (I mean DP836030 assert 54bit preamble or 52bit preamble?) Best regards, Kaneko