Cortex-A9 MPCore Technical Reference Manual: 3.3.9. Peripheral Identification Registers

3.3.9. Peripheral Identification Registers

The periph_id_[4:0] Registers provide information about the configuration of the peripheral. Table 3.1 shows the address base offset, reset value, and access type for these registers.

Each register provides eight bits of data but because some fields span across two adjacent periph_id registers then the following sections describe them:

periph_id_[3:0] register group

Figure 3.10 shows the periph_id_[3:0] register group bit assignments.

Figure 3.10. periph_id_[3:0] Register bit assignments

Table 3.8 shows the periph_id_[3:0] register group bit assignments.

Table 3.8. periph_id_[3:0] Register bit assignments

Bits	Name	Description
[31:28]	RevAnd	These bits read as 0x0.
[27:24]	mod_number	Identifies data that is relevant to the ARM partner.
[23:20]	Architecture number	Identifies the major revision number, r`n`, of the peripheral. The revision number starts from 0 and is revision-dependent.
[19]	jedec_used	Identifies if the IC uses the JEP106 manufacturer’s identity code.
[18:12]	JEP106[6:0]	Identifies the designer. This is set to b0111011, to indicate that ARM designed the peripheral.
[11:0]	part_number	Identifies the peripheral.

The following subsections describe the periph_id_[3:0] registers:

Peripheral Identification Register 0

The periph_id_0 Register is hard-coded and the fields in the register control the reset value. Table 3.9 shows the register bit assignments.

Table 3.9. periph_id_0 Register bit assignments

Bits	Name	Description
[31:8]	-	Reserved, read undefined
[7:0]	part_number_0	-

Peripheral Identification Register 1

The periph_id_1 Register is hard-coded and the fields in the register control the reset value. Table 3.10 shows the register bit assignments.

Table 3.10. periph_id_1 Register bit assignments

Bits

Name

Description

[31:8]

Reserved, read undefined.

[7:4]

jep106_id_3_0

JEP106 identity code [3:0]. See the JEP106, Standard Manufacturer’s Identification Code.

[3:0]

part_number_1

Peripheral Identification Register 2

The periph_id_2 Register is hard-coded and the fields in the register control the reset value. Table 3.11 shows the register bit assignments.

Table 3.11. periph_id_2 Register bit assignments

Bits	Name	Description
[31:8]	-	Reserved, read undefined.
[7:4]	Architecture number	The architecture number of the IC.
[3]	jedec_used	This indicates that the IC uses a manufacturer’s identity code that was allocated by JEDEC according to JEP106.
[2:0]	jep106_id_6_4	JEP106 identity code [6:4]. See the JEP106, Standard Manufacturer’s Identification Code.

Peripheral Identification Register 3

The periph_id_3 Register is hard-coded and the fields in the register control the reset value. Table 3.12 shows the register bit assignments.

Table 3.12. periph_id_3 Register bit assignments

Bits	Name	Description
[31:8]	-	Undefined.
[7:4]	RevAnd	-
[3:0]	mod_number	The customer can update this field if they modify the RTL of the Interrupt Controller.

periph_id_[7:4] register group

Figure 3.11 shows the periph_id_[7:4] register group bit assignments.

Figure 3.11. periph_id_[7:4] Register bit assignments

Table 3.13 shows the periph_id_[7:4] register group bit assignments.

Table 3.13. periph_id_[7:4] Register bit assignments

Bits	Name	Description
[31:8]	-	-
[7:4]	4KB count	Identifies the address space that the registers occupy.
[3:0]	jep106_c_code	Identifies the JEP106 continuation code.

The following subsection describe the periph_id_[7:4] register:

Peripheral Identification Register 4.

Peripheral Identification Register 4

The periph_id_4 Register is hard-coded and the fields in the register control the reset value. Table 3.14 shows the register bit assignments.

Table 3.14. periph_id_4 Register bit assignments

Bits	Name	Description
[31:8]	-	Undefined.
[7:4]	4KB count	The number of 4KB address blocks you require, to access the registers, expressed in powers of 2.
[3:0]	jep106_c_code	The JEP106 continuation code value represents how many `0x7F` continuation characters occur in the manufacturer’s identity code. See JEP106, Standard Manufacturer’s Identification Code.

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