2.4.6.2.1 Descriptor Structure Microblock Control Member
| Name: | MBR_UBC |
| Property: | Read-only |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| QOS[1:0] | NVIEW[1:0] | NDEN | NSEN | NDE | |||||
| Access | R | R | R | R | R | R | R | ||
| Reset | |||||||||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| UBLEN[23:16] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | |||||||||
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| UBLEN[15:8] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | |||||||||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| UBLEN[7:0] | |||||||||
| Access | R | R | R | R | R | R | R | R | |
| Reset | |||||||||
Bits 30:29 – QOS[1:0] Channel Quality of Service Level
Bits 28:27 – NVIEW[1:0] Next Descriptor View
| Value | Name | Description |
|---|---|---|
| 0 | NDV0 | Next Descriptor View 0 |
| 1 | NDV1 | Next Descriptor View 1 |
| 2 | NDV2 | Next Descriptor View 2 |
| 3 | NDV3 | Next Descriptor View 3 |
Bit 26 – NDEN Next Descriptor Destination Update
| Value | Description |
|---|---|
| 0 | Destination parameters remain unchanged. |
| 1 | Destination parameters are updated when the descriptor is retrieved. |
Bit 25 – NSEN Next Descriptor Source Update
| Value | Description |
|---|---|
| 0 | Source parameters remain unchanged. |
| 1 | Source parameters are updated when the descriptor is retrieved. |
Bit 24 – NDE Next Descriptor Enable
| Value | Description |
|---|---|
| 0 | Descriptor fetch is disabled. |
| 1 | Descriptor fetch is enabled. |