User Manual
Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 153 of 909 2019 Ambiq Micro, Inc.
All rights reserved.
3.8.2.42 DMASRAMWRITEPROTECT1 Register
SRAM write-protection bits.
OFFSET: 0x000003C4
INSTANCE 0 ADDRESS: 0x400203C4
These bits write-protect system SRAM from DMA operations in 8KB chunks.
3.8.2.43 DMASRAMREADPROTECT0 Register
SRAM read-protection bits.
OFFSET: 0x000003D0
INSTANCE 0 ADDRESS: 0x400203D0
These bits read-protect system SRAM from DMA operations in 8KB chunks.
Table 212: DMASRAMWRITEPROTECT0 Register Bits
Bit Name Reset RW Description
31:0 DMA_WPROT0 0x0 RW
Write protect SRAM from DMA. Each bit provides write protection for an
8KB region of memory. When set to 1, the region will be protected from
DMA writes, when set to 0, DMA may write the region.
Table 213: DMASRAMWRITEPROTECT1 Register
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
RSVD DMA_WPROT1
Table 214: DMASRAMWRITEPROTECT1 Register Bits
Bit Name Reset RW Description
31:16 RSVD 0x0 RO
RESERVED.
15:0 DMA_WPROT1 0x0 RW
Write protect SRAM from DMA. Each bit provides write protection for an
8KB region of memory. When set to 1, the region will be protected from
DMA writes, when set to 0, DMA may write the region.
Table 215: DMASRAMREADPROTECT0 Register
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
DMA_RPROT0