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3.2.4. c0, TCM Type Register

The processor does not implement Tightly Coupled Memory (TCM). The TCM Type Register specifies that the processor does not implement instruction and data TCMs.

The TCM Type Register is:

  • a read-only register that is Read-As-Zero

  • accessible in privileged modes only.

Table 3.8 shows the results of attempted access for each mode.

Table 3.8. Results of access to the TCM Type Register[3]
Secure privilegedNonsecure privilegedSecure UserNonsecure User
ReadWriteReadWriteReadWriteReadWrite
DataUndefinedDataUndefinedUndefinedUndefinedUndefinedUndefined

[3] An entry of Undefined in the table means that the access gives an Undefined Instruction exception when the coprocessor instruction is executed.


To access the TCM Type Register, read CP15 with:

MRC p15, 0, <Rd>, c0, c0, 2; Read TCM Type Register
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