Using loopback mode in Ethernet PHY transceiver

Hi guys, i want to test my Ethernet PHY for normal operation.

I understand in the IEEE802.3u and from the datasheet, i can change the loopback register 0.14 to 1 and test my PHY.

However, how do i even access this register since i'm working on this PHY on the hardware point of view, no programming?

I'm using Micrel's KS8721B

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Ant_Magma
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