自己做的C6678板，JTAG能连上，主时钟100MHz，默认main PLL BYPASS，不改PLL的配置时程序能正常运行。将主时钟改至1GHz后，同样的程序在调试中出现以下问题：
C66xx_0: Trouble Reading Memory Block at 0x80b69c on Page 0 of Length 0x4: (Error -1060 @ 0x80B69C) 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 5.0.569.0)
有时也出现以下问题：
C66xx_0: Trouble Reading Register CSR: (Error -1060 @ 0x41) 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 5.0.569.0)
请问是什么方面的原因。
