AM335x + WL18xx Slow Clock options

Hi all,

the reason why we are concerned driving WL18xx from CLKOUT2 32.768kHz source are some statements made in the AM335x TRM

4.2.4 Output Clock Characteristics

NOTE

The AM335x CLKOUT1 and CLKOUT2 clock outputs should not be used as a synchronous

clock for any of the peripheral interfaces because they were not timing closed to any other

signals. These clock outputs also were not designed to source any time critical external

circuits that require a low jitter reference clock. The jitter performance of these outputs is

unpredictable due to complex combinations of many system variables. For example,

CLKOUT2 may be sourced from several PLLs with each PLL supporting many configurations

that yield different jitter performance. There are also other unpredictable contributors to jitter

performance such as application specific noise or crosstalk into the clock circuits. Therefore,

there are no plans to specify jitter performance for these outputs.

Another data point is that no AM335x designs drive the 32kHz clock directly from the SOC, but have separate oscillators.

With the above, could the WL8 team comment?

Thanks,

--Gunter

Hi all,

do you have an update on the above question? It has been out there for a while.

Thanks,

--Gunter