Siemens ERTEC200

2.10 ARM946E-S Register

The ARM946E-S uses CP15 registers for system control.

Consequently, the following settings are possible:

• Configure cache type and cache memory area

• Configure tightly coupled memory area

• Configure memory protection unit for various regions and memory types

• Assign system option parameters

• Configure “Little Endian” or “Big Endian” operations

0 R ID code register (1)

Cache type register (1)

Tightly coupled memory size register (2)

1 W/R Control register

2 W/R Cache configuration register (2)

3 W/R Write buffer control register

4 xxx Undefined

5 W/R Access permission register (2)

6 W/R Protection region base/size register (2)

7 W Cache operation register

8 xxx Undefined

9 W/R Cache lockdown register (2)

10 xxx Undefined

11 xxx Undefined

12 xxx Undefined

13 W/R Trace process ID register

14 xxx Undefined

15 W/R

RAM/TAG-BIST test register (1)

Test state register (1)

Cache debug index register (1)

Trace control register

Table 5: CP15 Registers - Overview

(1) Registers contain multiple information entries that are selected by the “opcode_2” or “CRm” fields.

(2) Separate registers for instruction and data (see detailed description of registers).

Undefined means:

When this register is read, the read value is undefined.

When this register is written to, unforeseeable configuration changes can occur in the ARM946.

Refer to documents /1/ and /2/ for a detailed description of the ARM946 registers.

Technical data subject to change Version 1.1.0