25.9.2 DMA Control B 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: | CTRLB |
Offset: | 0x04 |
Reset: | 0x00000000 |
Property: | PAC Write-Protection |
Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
Access | |||||||||
Reset |
Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
QOS2[1:0] | |||||||||
Access | R/W | R/W | |||||||
Reset | 0 | 0 |
Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
QOS1[1:0] | |||||||||
Access | R/W | R/W | |||||||
Reset | 0 | 0 |
Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
QOS0[1:0] | |||||||||
Access | R/W | R/W | |||||||
Reset | 0 | 0 |
Bits 0:1, 8:9, 16:17 – QOSn Priority Group n QOS control [n=1..3]
Sets the Quality of service level for Channel Priority Group n. Setting this value affects arbitration within the device bus fabric. This value does not affect arbitration within the DMA.
Note: DMA0 has 3 priority levels, DMA1 has 2 priority
levels.
Value | Name | Description |
---|---|---|
0x0 | LEVEL_0 | QoS level is 0 (lowest) |
0x1 | LEVEL_1 | QoS level is 1 (lower) |
0x2 | LEVEL_2 | QoS level is 2 (medium) |
0x3 | LEVEL_3 | QoS level is 3 (high) |