TUSB1210 + DM3730 unable to read regs

Calum Mackinnon

Other Parts Discussed in Thread: DM3730, TUSB1210

Hi,

We find ourselves in the twilight zone between hardware and software in trying to figure out why we can’t get the TUSB1210 device to talk to the TI DM3730 processor. We can’t even read the registers. We are at the mercy of a hardware layer in the DM3730 which does not permit any control or test of the TUSB1210 device. We just get a message that says “sorry, nothing there”.

I have attached the schematic page from our design. The TUSB1210 design was implemented based on the one provided in the data sheet for the design. The TUSB1210 will be connecting to a USB hub device on another PCBA.

We have checked the power up sequence closely as well as the CLOCK, CS, and RESETB signals. The only thing we see that does not match the power up sequence is that DIR signal takes over 800 ms before it drops to 0, whereas the data sheet indicates this should occur within 0.54 ms from RESETB going high.

Cheers

Calum

4278.0141-0690-AC-75_JADE CONSOLE PCBA 20131223 1027.pdf

over 11 years ago

0 Diego Cortes over 11 years ago

TI__Mastermind 36085 points

Hello Calum,

The schematic looks good, however I am concerned about the power on sequence you mentioned. Could you share the scope capture of the ULPI interface and voltages during the power on sequence .

Regards,

Diego.

0 Calum Mackinnon over 11 years ago in reply to Diego Cortes

Genius 4155 points

Hey Diego,

We are just getting back to this issue. We'll try and capture the ULPI inreface and volatges but I'm not sure we will get them all. Are ther a few that are absolutely necessary or do you really need them all?

I have attached a couple of plots showing the clock and DIR pin. We have about a 1.5ns rise and fall time on the 60MHz clock - is that OK?

The green trace is the DIR line.

We had this up and running with the SMSC3320 part but opted to change to the TUS1210.

0 Diego Cortes over 11 years ago in reply to Calum Mackinnon

TI__Mastermind 36085 points

Hello,

The CLK looks fine, Could you have measurements of the power Signals?.

Regards,

Diego.

0 Diego Cortes over 11 years ago in reply to Diego Cortes

TI__Mastermind 36085 points

Hello again,

could you share more information regarding the customer and this project.

Regards,

Diego.

Interface

Interface forum

TUSB1210 + DM3730 unable to read regs