Byte 0: PS Bit 7, SPF Bit 6, Page Code (19h) Bit 5 to 0
Byte 1: Sub-page Code
Byte 2 to 3: Page Length
Byte 4: Reserved
Byte 5: Reserved Bit 7 to 4, Protocol Identifier Bit 3 to 0
Byte 6: Generation Code
Byte 7: Number of Phys
Enhanced Phy Mode Descriptor List
Byte 8 to 27: First Enhanced Phy Mode Descriptor
Byte 28 to 47: Second Enhanced Phy Mode Descriptor