Hello,
I'm using the TUSB1310 PHY is our device system. I found that when device is in U1 and sending Ping.LFPS to its link partner, the Ping.LFPS tburst is not as expected.
For example, if I de-assert TX_ELECIDLE for 56ns, I get a 156~200ns Ping.LFPS according to Lecory analyser. After I increase the TX_ELECIDLE de-assert duration to 140ns,
the LFPS tburst from TI PHY becomes in a range of 200~240ns. The tburst length is not a fixed value for each Ping.LFPS we captured. It varies in a range.
But we did not see this happens when we are driving U1/U1/U3 exit LFPS, the tburst length is what we want.
Do you know the reason for this? Why the the TI PHY's output tburst is not as expected when we are sending Ping.LFPS? Thanks.
-Hefei
