Update RTL8218B.md

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@ -8,6 +8,12 @@ Page | Register | Bits | Feature | Documentation
--- | --- | --- | --- | ---
**Page** | **Register** | **Bits** | **unknown** |
0xa42 | 0x14 | 07:07 | 500M_EEE_ABILITY
**Page** | **Register** | **Bits** | **unknown** |
0xa44 | 0x11 | 09:09 | RETRY_DOWN_SPEED_500
0xa44 | 0x11 | 05:05 | UTP_DOWN_SPEED | 0 = 100MBit
0xa44 | 0x11 | 03:03 | UTP_DOWN_SPEED_ENABLE
0xa44 | 0x11 | 02:02 | 2PAIR_AUTO_DOWNSPEED
These additional/internal registers are organized in pages of 8. Each page knows registers 0x10-0x17. Their "absoulte" address can be calucalted by the formula page * 8 + (register - 16). It seems as if they are for the whole chip package and only accessed via the first port.