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Compiler/TMS320F28335: XDS100V1 USB EMULATOR AND ZQ28335 BOARD

Part Number: TMS320F28335

Tool/software: TI C/C++ Compiler

I am using zq28335 board and xds100v1 emulator. the emulators works for one time and fails. then i change onther emulater seed xds 100. it works for one time and tthe next time gives the following error. how can i solve the low operating  mode of device?

this is the error , 

Error connecting to the target:
(Error -1155 @ 0x0)
Device may be operating in low-power mode. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK).
(Emulation package 5.1.232.0)