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Unable to access device memory



Hi all,

- I get the following error when debugging my c5505 eZdsp.I tried to implement the AER project on it.

C55xx: Can't Single Step Target Program: (Error -2130 @ 0x400) Unable to access device memory. Verify that the memory address is in valid memory. If error persists, confirm configuration, power-cycle board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 5.0.520.0)

 C55xx: Trouble Reading PC Register: (Error -1004 @ 0x0) Device is not responding to the request. 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 5.0.520.0)

C55xx: Trouble Reading Register ST0: (Error -1004 @ 0x3) Device is not responding to the request. 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 5.0.520.0)

C55xx: Trouble Reading Register XDS_CPUMIG: (Error -2130 @ 0x5C) Unable to access device memory. Verify that the memory address is in valid memory. If error persists, confirm configuration, power-cycle board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 5.0.520.0)

- I get these errors when I step over  the instruction below .

   siu_open_drc(siu_inst, siu_setup->drc_cfgbits, samp_rates);     (038475:   4804                     RET)

-It seems that the sysstack has got some problems so that the instuction  can't return .But I don't know how to deal with it.I've tried to modify the .cmd file,but it didin't work.

- What could be the reason?

Thanks...