TMS320F28376S: TMS320F28376S - Singals exsit before VDDIO of DSP

Hi,

Yes it does violate the Power Sequencing requirement of the DSP. 

"Before powering the device, no voltage larger than 0.3 V above VDDIO can be applied to any digital pin, and no voltage larger than 0.3 V above VDDA can be applied to any analog pin (including VREFHI)."

Please refer "Power Sequencing" section in the Datasheet.

Regards,

Nirav

Hi Nirav ,

Thank you for the quick response , so thus connecting JTAG probe to unpower target also violate power sequence as you mention or it rely on detecting power  on the taeget side (e.g. vdd pin ) ?

Yes, power sequencing requirements applies to JTAG pins as well.

Regards,

Nirav

So how its recommended to connect JTAG probe to target ? Without power ? Or connect to target under power ?

The manufacture recommends to connect to target without power  , but as the debug probe  has its own power it will violate the power sequence on the DSP

Hi,

Are you talking about the JTAG pins connection to the 14/20 pin header on the Board, or to the DSP?

Please refer to the JTAG section in Data sheet, it explains the JTAG probe connection requirements. In order to connect Debug probe to the DSP you will need to first power the DSP and then connect the emulator.

Regards,

Nirav

Hi Nirav ,

Yes i am talking about the flow of connecting JTAG  proeb to Target , for the scenrio of BLACKHAWK (e.g. USB2000)

they sugsest the follwoing flow 

1. connecto probe to USB (e.g. to PC)

2.connect the probe (e.g. 14 pin connector )  to unpower target (e.g. DSP doenst have power)

3.Power the target 

while you sugesting that this scenrio vilatie power sequence of the DSP , i am guess that the Debug Probe doent route signals until there sens from target (e.g. until there is VDD)