Can I use SWD interface debugging TMS570LS3137?

Jiaming,

Thanks for using our forum.

The Hercules family does not support SWD. Our JTAG interface uses the 5 pins JTAG. (TDI, TDO, TCK, TMS, nTRST)

Is nTRST very important? I find the FT2232HL  dosn't  have nTRST pin but has other 4(TDI, TDO, TCK, TMS). If I use FT2232HL debugging and downloading program into TMS570, I must use a pin to simulate nTRST?

In "TMS570LS31x_USB_STICK_Schematic", I find pin21 of FT2232HL is used as nTRST. Is there code example to do this?

Jiaming,

nTRST is used to reset the debug logic. Inside the device, nTRST has a pull-down. If nTRST is not driven high there is no way to access the device. (Debug logic will stay in reset state) I will have to check how it is manage on our HDK and USB stick.

thanks for your reply, I hope to get your answer soon.

Do you get the answer about the FT2232HL? I am designing a schematic ,so I need your answer as soon as possible.

Jiaming,

We use GIOL0 (ADBUS4 of FTDI, and IO12_10 of CPLD) as nTRST. This signal is routed to XDS100_TRSTn in CPLD. The XDS100V2_TRSTn is connected to JTAG nTRST on HDK.

Regards,

QJ