S32K3xx - media clock timestamping using PPS0 input

[jakub_mielczare]

Hello,

In S32K3 RM, in chapter "73.17.167 MAC PPS Control (MAC_PPS_Control)" it says that PPS0 can be used to capture presentation time at rising/falling/both edge of a media clock.

But the same values of PPSCTRL_PPS CMD are used also above in the manual:

How is it defined which of the above value sets are effective, pulse train or timestamp capture on edge?

Thank you,

Jakub

[jakub_mielczare]

Hello,

Is there any update in this topic?

[jakub_mielczare]

Hello. Is there any update here?

[Shuang]

Hi Jakub,

The attachment is a draft version of PPS user guide. You can refer to it.

BR,

Shuang

[jakub_mielczare]

Hi,

Thank you for the answer and the PPT file.

Is it possible to read timestamps from MAC PPS0 Target Time registers (written by MAC on capturing rising/falling edge of an external clock signal) by CPU or only DMA can make those reads?

Thank you,

Jakub

[Shuang]

Hi Jakub,CPU and DMA can read&write MAC PPS0 Target Time registers. DMA can reduce CPU loading and it is recommended for operation. 

The attachment is a demo project that DMA will write data to MAC PPS0 Target Time registers and will generate media clock. 

BR,

Shuang