9 Identification Register, IDR

The IDR provides a mechanism for the debugger to know various identity attributes of the AP.

The IDR register characteristics are:









The following figure shows the bit assignments.

Figure 9-145 IDR register bit assignments
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The following table shows the bit assignments.

Table 9-151 IDR register bit assignments

Bits Reset value Name Function
[31:28] 0b0001 REVISION

Revision. An incremental value starting at 0x0 for the first design of a component. See the css600 Component list in Chapter 1 for information on the RTL revision of the component.

[27:24] 0b0100 JEDEC_bank

The JEP106 continuation code. Returns 0x4, indicating Arm as the designer.

[23:17] 0b0111011 JEDEC_code

The JEP106 identification code. Returns 0x3B, indicating Arm as the designer.

[16:13] 0b0000 Class

Returns 0x8, indicating No defined class.

[12:8] 0b00000 RAZ/WI

Read-As-Zero, Writes Ignored.

[7:4] 0b0010 Variant

Returns 0x2, indicating variation from base type specified by IDR.Type.

[3:0] 0b0000 Type

Returns 0x0, indicating that this is a JTAG Access Port.

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