TUSB1210: TUSB1210 ULPI_DATA SIGNAL has 400 mV staircase

Rita Gan

Part Number: TUSB1210

FPGA : XAZU2EG ; It appears there is a bus contention. What is the root cause? Are there any risks?

0 Brian Zhou 2 months ago

Hi Rita:

What is the pulse width for staircase?

Can you capture with DIR signal together? It could be turnaround cycle when DIR goes low.

Best

Brian

0 Rita Gan 2 months ago in reply to Brian Zhou

HI Brian：

0 Brian Zhou 2 months ago in reply to Rita Gan

Hi Rita:

The location with staircase is a turnaround cycle. In turnaround cycle, either link nor PHY can drive the bus.

Data during turnaround cycle is undefined and should be ignored.

Regards

Brian

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