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4.3.23. NEON Busy Register

The NEON Busy Register characteristics are:

Purpose

Enables software to determine if a NEON instruction is executing.

Usage constraints
  • a read-only register in Secure state

  • a read-only register in Non-secure state.

Configurations

Available in all configurations.

Attributes

See the register summary in Table 4.15.

Figure 4.22 shows the NEON Busy Register bit assignments

Figure 4.22. NEON Busy Register bit assignments

Figure 4.22. NEON Busy Register bit assignments

Table 4.49 shows the NEON Busy Register bit assignments.

Table 4.49. NEON Busy Register bit assignments
BitsNameFunction
[31:1]-Reserved.
[0]NEON busySoftware can use this to determine if a NEON instruction is executing. This bit is set to 1 if there is a NEON instruction in the NEON pipeline, or in the processor pipeline.

To access the NEON Busy Register, read the CP15 register with:

MRC p15,0,<Rd>,c15,c1,0; Read NEON Busy Register
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