u16 N PHY Classifier(u16 mask, u16 val)
- on core rev 16, suspend MAC if not suspended
read PHY reg 0xB0, and with 0x7, and with ~mask, or with (val & mask), and save
MaskSet phy reg 0xB0 with mask 0xFFF8 and set with the calculated value above
- if suspended above, re-enable MAC
- Return the calculated value
Just assume mask/value are both zero and return/save the calculated value.