TI工程师，您好!
我们设计制作了一块C6747板卡，但是在CCS3.3中使用仿真器连接时出现以下问题：
Error connecting to the target:
Error 0x80000240/-275
Fatal Error during: Initialization, OCS,
This error was generated by TI's USCIF driver.
SC_ERR_SCAN_POLL_BUSY <-275>
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.
Board Name: C6747 XDS560 Emulator
Cpu Name: TMS320C674X_0
Error 0x80000240/-275
Fatal Error during: Initialization, OCS,
This error was generated by TI's USCIF driver.
SC_ERR_SCAN_POLL_BUSY <-275>
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.
Board Name: C6747 XDS560 Emulator
Cpu Name: TMS320C674X_0
仿真器为合众达XDS560PLUS，使用相同的软件和仿真器连接其它型号的C6747的板卡时均未出现问题，JTAG接口电路也是完全复制以前的成熟板卡。
请问造成以上问题的原因是什么？
或者如何逐步检测以确定问题所在、并解决上述问题？
