20.8.9 Priority Control 0

Name: PRICTRL0
Offset: 0x14
Reset: 0x00000000
Property: PAC Write-Protection

Bit 3130292827262524 
 RRLVLEN3   LVLPRI3[3:0] 
Access R/WR/WR/WR/WR/W 
Reset 00000 
Bit 2322212019181716 
 RRLVLEN2   LVLPRI2[3:0] 
Access R/WR/WR/WR/WR/W 
Reset 00000 
Bit 15141312111098 
 RRLVLEN1   LVLPRI1[3:0] 
Access R/WR/WR/WR/WR/W 
Reset 00000 
Bit 76543210 
 RRLVLEN0   LVLPRI0[3:0] 
Access R/WR/WR/WR/WR/W 
Reset 00000 

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 Arbitration.

ValueDescription
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 Arbitration.

ValueDescription
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 Arbitration.

ValueDescription
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 Arbitration.

ValueDescription
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').