Defines Device memory, and Inner cacheability. Must be interpreted in conjunction with AttrH.
The possible values are:
0b0000 Device (nGnRnE) memory if AttrH is 0b0000. Otherwise this value is reserved.
0b0100 Device (not nGnRnE) memory if AttrH is 0b0000. Otherwise, Normal memory, Inner
Non-cacheable.
0b1000 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Through
Cacheable.
0b1001 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Through
Cacheable, Inner Write-Allocate.
0b1010 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Through
Cacheable, Inner Read-Allocate.
0b1011 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Through
Cacheable, Inner Write-Allocate, Inner Read-Allocate.
0b1100 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Back
Cacheable.
0b1101 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Back
Cacheable, Inner Write-Allocate.
0b1110 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Back
Cacheable, Inner Read-Allocate.
0b1111 Reserved if AttrH is 0b0000. Otherwise, Normal memory, Inner Write-Through
Cacheable, Inner Write-Allocate, Inner Read-Allocate.
All other values are reserved.
[55:48]
Reserved, RES0.
PA, [47:12]
Physical address. The Physical Address corresponding to the supplied Virtual Address. Returns
address bits[47:12].
[11]
Reserved, RES1.
[10]
Reserved, RES0.
NS, [9]
Non-secure. The NS attribute for a translation table entry read from Secure state.
This bit is UNKNOWN for a translation table entry from Non-secure state.
SHA, [8:7]
Shareability attribute for the Physical Address returned from a translation table entry. The
possible values are:
0b00 Non-shareable.
0b01 Reserved.
0b10 Outer Shareable
0b11 Inner Shareable.
Takes the value of 0b10 for:
• Any type of device memory.
• Normal memory with both Inner Non-cacheable and Outer-cacheable attributes.
B2 AArch64 system registers
B2.85 Physical Address Register, EL1
100236_0100_00_en Copyright © 2015–2017, 2019 Arm Limited or its affiliates. All rights
reserved.
B2-515
Non-Confidential
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