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B.1. About the test registers

The ARM920T coprocessor 15 (CP15), register 15 (c15) is used to provide additional device-specific test operations. You can use it to access and control the following:

You must only use these operations for test. The ARM Architecture Reference Manual describes this register as implementation defined.

The format of the CP15 test operations is:

MCR/MRC	 p15,opcode_1,Rd,c15,CRm,opcode_2

Figure B.1. CP15 MRC and MCR bit pattern

Figure B.1. CP15 MRC and MCR bit pattern

The L bit distinguishes between an MCR (L = 1) and an MRC (L = 0).

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