You copied the Doc URL to your clipboard.

4.3.4. Revision ID register

The REVIDR characteristics are:


Provides implementation-specific minor revision information that can only be interpreted in conjunction with the MIDR.

Usage constraints

The REVIDR is:

  • a read-only register

  • common to the Secure and Non-secure states

  • only accessible in privileged modes.


Available in all configurations.


See the register summary in Table 4.2.

Figure 4.4 shows the REVIDR bit assignments.

Figure 4.4. REVIDR bit assignments

Figure 4.4. REVIDR bit assignments

Table 4.31 shows the REVIDR bit assignments.

Table 4.31. REVIDR bit assignments
[31:0]ID number

Implementation-specific revision information.

The reset value is determined by the specific Cortex-A9 implementation.

To access the REVIDR, read the CP15 register with:

MRC p15, 0, <Rt>, c0, c0, 6; Read Revision ID Register
Was this page helpful? Yes No