25.8.9 Priority Control 0
| Name: | PRICTRL0 |
| Offset: | 0x14 |
| Reset: | 0x00000000 |
| Property: | PAC Write Protection |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| RRLVLEN3 | LVLPRI3[3:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| RRLVLEN2 | LVLPRI2[3:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| RRLVLEN1 | LVLPRI1[3:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| RRLVLEN0 | LVLPRI0[3:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | ||||
| Reset | 0 | 0 | 0 | 0 | 0 | ||||
Bit 31 – RRLVLEN3 Level 3 Round-Robin Arbitration Enable
This bit controls which arbitration scheme is selected for DMA channels with priority level 3. For details on arbitration schemes, refer to 25.6.2.4 Arbitration.
| Value | Description |
|---|---|
| 0 | Static arbitration scheme for channels with level 3 priority |
| 1 | Round-robin arbitration scheme for channels with level 3 priority |
Bits 27:24 – LVLPRI3[3:0] Level 3 Channel Priority Number
When round-robin arbitration is enabled
(PRICTRL0.RRLVLEN3=1) for priority level 3, this register holds
the channel number of the last DMA channel being granted access as the active channel
with priority level 3.
When static arbitration is enabled (PRICTRL0.RRLVLEN3=0)
for priority level 3, and the value of this bit group is non-zero, it will not affect
the static priority scheme.
This bit group is not reset when round-robin arbitration gets disabled
(PRICTRL0.RRLVLEN3 written to '0').
Bit 23 – RRLVLEN2 Level 2 Round-Robin Arbitration Enable
This bit controls which arbitration scheme is selected for DMA channels with priority level 2. For details on arbitration schemes, refer to 25.6.2.4 Arbitration.
| Value | Description |
|---|---|
| 0 | Static arbitration scheme for channels with level 2 priority |
| 1 | Round-robin arbitration scheme for channels with level 2 priority |
Bits 19:16 – LVLPRI2[3:0] Level 2 Channel Priority Number
When round-robin arbitration is enabled
(PRICTRL0.RRLVLEN2=1) for priority level 2, this register holds
the channel number of the last DMA channel being granted access as the active channel
with priority level 2.
When static arbitration is enabled (PRICTRL0.RRLVLEN2=0)
for priority level 2, and the value of this bit group is non-zero, it will not affect
the static priority scheme.
This bit group is not reset when round-robin arbitration gets disabled
(PRICTRL0.RRLVLEN2 written to '0').
Bit 15 – RRLVLEN1 Level 1 Round-Robin Scheduling Enable
For details on arbitration schemes, refer to 25.6.2.4 Arbitration.
| Value | Description |
|---|---|
| 0 | Static arbitration scheme for channels with level 1 priority |
| 1 | Round-robin arbitration scheme for channels with level 1 priority |
Bits 11:8 – LVLPRI1[3:0] Level 1 Channel Priority Number
When round-robin arbitration is enabled
(PRICTRL0.RRLVLEN1=1) for priority level 1, this register holds
the channel number of the last DMA channel being granted access as the active channel
with priority level 1.
When static arbitration is enabled (PRICTRL0.RRLVLEN1=0)
for priority level 1, and the value of this bit group is non-zero, it will not affect
the static priority scheme.
This bit group is not reset when round-robin arbitration gets disabled
(PRICTRL0.RRLVLEN1 written to '0').
Bit 7 – RRLVLEN0 Level 0 Round-Robin Scheduling Enable
For details on arbitration schemes, refer to 25.6.2.4 Arbitration.
| Value | Description |
|---|---|
| 0 | Static arbitration scheme for channels with level 0 priority |
| 1 | Round-robin arbitration scheme for channels with level 0 priority |
Bits 3:0 – LVLPRI0[3:0] Level 0 Channel Priority Number
When round-robin arbitration is enabled
(PRICTRL0.RRLVLEN0=1) for priority level 0, this register holds
the channel number of the last DMA channel being granted access as the active channel
with priority level 0.
When static arbitration is enabled (PRICTRL0.RRLVLEN0=0)
for priority level 0, and the value of this bit group is non-zero, it will not affect
the static priority scheme.
This bit group is not reset when round-robin arbitration gets disabled
(PRICTRL0.RRLVLEN0 written to '0').