9 Base Frequency ID register, CNTFID0

You must program this register to match the clock frequency of the timestamp generator, in ticks per second. For example, for a 50 MHz clock, program 0x02FAF080. The real-time speed of the counter does not depend on the value of this register. This register reports, to the reader, the speed of the counter as programmed by the system firmware.

The CNTFID0 register characteristics are:

Attributes
Offset

0x0020

Type

Read-write

Reset

0x00000000

Width

32

The following figure shows the bit assignments.

Figure 9-518 CNTFID0 register 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 9-536 CNTFID0 register bit assignments

Bits Reset value Name Function
[31:0] 0x0 Freq

Frequency in number of ticks per second. Up to 4GHz can be specified.

Non-ConfidentialPDF file icon PDF version100806_0300_00_en
Copyright © 2017, 2018 Arm Limited or its affiliates. All rights reserved.