连接时出现下面的错误提示如何解决
Error connecting to the target:
(Error -275 @ 0x0)
The attempt to poll a target device exceeded its timeout limit.
The utility or debugger has requested that a target device be
repeatedly accessed for a specific data or status value.
This has failed because the built-in limit for the maximum number
of attempts when polling the JTAG scan-path has been exceeded.
(Emulation package 7.0.100.0)
