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DP83620: Procedure for writing to ELAST_BUF[1:0] of RMII and Bypass Register

Part Number: DP83620

Hello, everyone.
I wrote to ELAST_BUF[1:0] in the RMII and Bypass Register described in chapter 10.2.4 of the datasheet "dp83620.pdf".
However, the value is not reflected. Please tell me the writing procedure.

The other registers can be written.