K60P100M100SF2RM Datasheet, PDF (369/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Field
31
RO
30
HLP
29–10
Reserved
9–8
ARB
7–6
Reserved
5–4
PCTL
3
Reserved
2–0
PARK
Chapter 17 Crossbar Switch (AXBS)
AXBS_CRSn field descriptions
Read only
Description
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.
Halt low priority
Sets the initial arbitration priority for low power mode requests. Setting this bit will not effect 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
This read-only field is reserved and always has the value zero.
Arbitration mode
Selects the arbitration policy for the slave port.
00 Fixed priority
01 Round-robin, or rotating, priority
10 Reserved
11 Reserved
This read-only field is reserved and always has the value zero.
Parking control
Determines the slave port’s parking control. The low-power park feature results in an overall power
savings if the slave port is not saturated. However, this forces an extra latency clock when any master
tries to access the slave port while not in use because it is not parked on any master.
00 When no master makes a request, the arbiter parks the slave port on the master port defined by the
PARK bit field
01 When no master makes a request, the arbiter parks the slave port on the last master to be in control
of the slave port
10 When no master makes a request, the slave port is not parked on a master and the arbiter drives all
outputs to a constant safe state
11 Reserved
This read-only field is reserved and always has the value zero.
Park
Determines which master port the current slave port parks on when no masters are actively making
requests and the PCTL bits are cleared.
NOTE: Only select master ports that are actually present on the device. If not, undefined behavior may
occur.
000 Park on master port M0
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K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
369