Information
AXBS_PRSn field descriptions (continued)
Field Description
011 This master has level 4 priority when accessing the slave port.
100 This master has level 5 priority when accessing the slave port.
101 This master has level 6 priority when accessing the slave port.
110 This master has level 7 priority when accessing the slave port.
111 This master has level 8, or lowest, priority when accessing the slave port.
18.2.2 Control Register (AXBS_CRSn)
These registers control several features of each slave port and must be accessed using 32-
bit accesses. After CRSn[RO] is set, the CRSn can only be read; attempts to write to it
have no effect and result in an error response.
Address: 4000_4000h base + 10h offset + (256d × i), where i=0d to 7d
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
RO HLP
0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0
ARB
0
PCTL
0
PARK
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
AXBS_CRSn field descriptions
Field Description
31
RO
Read Only
Forces the slave port’s CSRn and PRSn registers to be read-only. After set, only a hardware reset clears
it.
0 The slave port’s registers are writeable
1 The slave port’s registers are read-only and cannot be written. Attempted writes have no effect on the
registers and result in a bus error response.
30
HLP
Halt Low Priority
Sets the initial arbitration priority for low power mode requests. Setting this bit will not affect the request for
low power mode from attaining highest priority once it has control of the slave ports.
0 The low power mode request has the highest priority for arbitration on this slave port
1 The low power mode request has the lowest initial priority for arbitration on this slave port
29–10
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
9–8
ARB
Arbitration Mode
Selects the arbitration policy for the slave port.
Table continues on the next page...
Memory Map / Register Definition
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
354
Preliminary
Freescale Semiconductor, Inc.
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