4.3.6. Revision ID Register

The REVIDR characteristics are:


Provides implementation-specific 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 from PL1 or higher.


Available in all configurations.


See the register summary in Table 4.3.

Figure 4.5 shows the REVIDR bit assignments.

Figure 4.5. REVIDR bit assignments

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Table 4.33 shows the REVIDR bit assignments.

Table 4.33. REVIDR bit assignments

[31:0]ID number

Implementation-specific revision information. The reset value is determined by the specific Cortex-A7 MPCore implementation.

To access the REVIDR, read the CP15 register with:

MRC p15, 0, <Rt>, c0, c0, 6; Read Revision ID Register
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