The PLEFSR characteristics are:
Indicates how many entries remain available in the PLE FIFO.
- Usage constraints
The PLEFSR is:
Common to Secure and Non-secure states
Accessible in User and Privileged modes, regardless of any configuration bit.
NSAC.PLE controls Non-secure accesses.
Available in all Cortex-A9 configurations regardless of whether a PLE is present or not.
See Table 4.24.
Figure 4.15 shows the PLEFSR bit assignments.
Table 4.27 shows the PLEFSR bit assignments.
Number of available entries in the PLE FIFO
This is the difference between the total number of entries in the FIFO, which is configuration-specific, and the number of entries already programmed.
Use the PLESFR to check that an entry is available before programming a new PLE channel.
To access the PLESFR, use:
MRC p15, 0, <Rt>, c11, c0, 4; Read the PLESFR