3.4.1 ROMENTRY0, Class 0x9 ROM Table entry

This entry is used to point to the ROM table of the target system.

The ROMENTRY0 characteristics are:

Usage constraints
This entry shows the base address of the ROM table of the target system, relative to the base address of this ROM table. It is defined by a configuration parameter. Bits [1:0] are updated according to the authentication status.
Configurations
Available in the Integrated Cortex-M DAP variant.
Attributes
32-bit read-only.

The following figure shows the bit assignments.

Figure 3-5 ROMENTRY0 bit assignments
To view this graphic, your browser must support the SVG format. Either install a browser with native support, or install an appropriate plugin such as Adobe SVG Viewer.


The following table shows the bit assignments.

Table 3-5 ROMENTRY0 bit assignments

Bits Name Function
[31:12] OFFSET

ROM_ENTRY0[31:12]

Defined by the parameter ROM_ENTRY0. These are the upper bits of the relative address of the ROM table of the target system.

[11:3] - res0.
[2] POWERIDVALID
0No standard power control.
[1:0] PRESENT Indicates whether an entry is present at this location in the ROM Table. This field can have one of the following values:
0b10

The ROM entry is not present, and this ROMENTRY<n> is not the final entry in a ROM Table with fewer than the maximum number of entries. This value is set when all debug is disabled on the authentication interface.

0b11

The ROM Entry is present. This value is set when any debug is allowed on the authentication interface.

Non-ConfidentialPDF file icon PDF version101130_0002_02_en
Copyright © 2018 Arm Limited or its affiliates. All rights reserved.