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System Control Coprocessor
ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 4-48
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Figure 4-33 Auxiliary fault status registers format
Table 4-30 shows how the bit values correspond with the auxiliary fault status register functions.
To access the auxiliary fault status registers, read or write CP15 with:
MCR p15, 0, <Rd>, c5, c1, 0 ; Write Auxiliary Data Fault Status Register
MRC p15, 0, <Rd>, c5, c1, 0 ; Read Auxiliary Data Fault Status Register
MCR p15, 0, <Rd>, c5, c1, 1 ; Write Auxiliary Instruction Fault Status Register
MRC p15, 0, <Rd>, c5, c1, 1 ; Read Auxiliary Instruction Fault Status Register
The contents of an auxiliary fault status register are only valid when the corresponding Data or
Instruction Fault Status Register indicates that a parity error has occurred. At other times the
contents of the auxiliary fault status registers are Unpredictable.
c6, Data Fault Address Register
The Data Fault Address Register (DFAR) holds the address of the fault when a precise abort
occurs.
The DFAR is:
• a read/write register
• accessible in Privileged mode only.
Reserved IndexReserved
31 0
Reserved
4
27 24 23 22 14 13 5
CacheWay
Side
28
21 20
Recoverable error
Table 4-30 ADFSR and AIFSR bit functions
Bits Field Function
[31:28] Reserved SBZ.
[27:24]
CacheWay
a
The value returned in this field indicates the cache way or ways in which the error occurred.
[23:22] Side The value returned in this field indicates the source of the error. Possible values are:
b00 = Cache or AXI-master interface
b01 = ATCM
b10 = BTCM
b11 = Reserved.
[21] Recoverable
error
The value returned in this field indicates if the error is recoverable.
0 = Unrecoverable error.
1 = Recoverable error. This includes all correctable parity/ECC errors and recoverable
TCM external errors.
[20:14] Reserved SBZ.
[13:5]
Index
b
This field returns the index value for the access giving the error.
[4:0] Reserved SBZ.
a. This field is only valid for data cache store parity/ECC errors, otherwise it is Unpredictable.
b. This field is only valid for data cache store parity/ECC errors. On the AIFSR, and for TCM accesses, this field SBZ.