TUSB1310A , I cannot disable SSC...

MASAO YAMAZAKI

Prodigy 130 points

Other Parts Discussed in Thread: TUSB1310A

Hi,

I want to stop the TUSB1310A's SSC.

Although I set the Strap Option, SSC_DIS, to 1, SSC does not stop.

Do I need to set some other signals or sequences?

Best regards,

Yamazaki

over 13 years ago

0 39vc over 13 years ago

Prodigy 90 points

Hi,

I have a same problem.

My design's timing is below. I think that this is the same as description of datasheet.

However, SSC was not disable. Is there any problem?

0 Elias Villegas M. over 13 years ago in reply to 39vc

TI__Guru* 76130 points

Make sure your strap option is stable before the de-assertion of RESETN.

If you are not using the JTAG interface, make sure terminals JTAG_TRSTN and JTAG_TCK are pulled low.

Regards.

0 39vc over 13 years ago in reply to Elias Villegas M.

Prodigy 90 points

Thank you for your reply. I tried JTAG_TRSTN and JTAG_TCK force to low. But SSC was enabled. Is there the other pin settings ?

For reference.
All JTAG pin settings are below.

JTAG_TRSTN = GND
JTAG_TDO   = Open
JTAG_TDI   = Pull-Up
JTAG_TMS   = Pull-Up
JTAG_TCK   = GND

0 Elias Villegas M. over 13 years ago in reply to 39vc

TI__Guru* 76130 points

Hello Ken,

You should set all your strap options before de-asserting RESETN, the image you added on the previous post show TX_MARGIN_0 going low after the de-assertion of RESETN.

Also, you have to provide a stable reference clock before the de-assertion of RESETN.

Regards.

0 39vc over 13 years ago in reply to Elias Villegas M.

Prodigy 90 points

Hi Elias,

I confirmed your all check points. However, SSC can never turn OFF.

There is no problem about TX_MARGIN_0, RESETN, reference clock and JTAG.

Our board design is same your reference board.

Is there the other check point?

Regards,

Interface

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TUSB1310A , I cannot disable SSC...