Information

AXBS_CRSn field descriptions (continued)
Field Description
00 Fixed priority
01 Round-robin, or rotating, priority
10 Reserved
11 Reserved
7–6
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
5–4
PCTL
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 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
3
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
2–0
PARK
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
001 Park on master port M1
010 Park on master port M2
011 Park on master port M3
100 Park on master port M4
101 Park on master port M5
110 Park on master port M6
111 Park on master port M7
Chapter 18 Crossbar Switch (AXBS)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
355
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