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Does it mean it can't be switched to lower frequency ?
Or the 1GHz just represents the base frequency, the system counter still can switch to lower frequency such as 50MHz, 100MHz, etc ?
Then how to understand the words "Though each unit of the counter is set to 1ns, this does not require that the counter is incremented every 1ns. A step in the counter might be more than a single bit increment. It is recommended that the count is not incremented at a rate that is less than 50MHz in normal running operation." ? Does it not mean that it can still be switched to lower frequency?
The manual always says "from 8.0 to 8.5 ..." whenever it comes to lower frequencies.Though I see that the "note" you are referring might be intended for 8.0 to 8.6.
Maybe some ARM employee can fill the gap. ;-)