32.8.31 GMAC Stacked VLAN Register
| Symbol | Description | Symbol | Description | Symbol | Description |
|---|---|---|---|---|---|
| R | Readable bit | HC | Cleared by Hardware | (Grey cell) | Unimplemented |
| W | Writable bit | HS | Set by Hardware | X | Bit is unknown at Reset |
| K | Write to clear | S | Software settable bit | — | — |
| Name: | SVLAN |
| Offset: | 0x10C0 |
| Reset: | 0x00000000 |
| Property: | - |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| ESVLAN | |||||||||
| Access | - | ||||||||
| Reset | 0 |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| VLAN_TYPE[15:8] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| VLAN_TYPE[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bit 31 – ESVLAN Enable Stacked VLAN Processing Mode
0: Disable the stacked VLAN processing mode
1: Enable the stacked VLAN processing mode
| Value | Description |
|---|---|
| 0 | Stacked VLAN Processing disabled |
| 1 | Stacked VLAN Processing enabled |
Bits 15:0 – VLAN_TYPE[15:0] User Defined VLAN_TYPE Field
When Stacked VLAN is enabled
(ESVLAN=1), the first VLAN tag in a received frame will only be accepted if the
VLAN type field is equal to this user defined VLAN_TYPE, OR equal to the
standard VLAN type (0x8100).
Note: The second VLAN tag of a
Stacked VLAN packet will only be matched correctly if its VLAN_TYPE field
equals 0x8100.