求高手指点，C6748 JTAG连接不上

使用UART BOOT (PC机采用 UART BOOT HOST ),打印信息如下：

(File IO): Read 33380 bytes from file E:\b.bin.
(Serial Port): Opening COM1 at 115200 baud...
(AIS Parse): Read magic word 0x41504954.
(AIS Parse): Waiting for BOOTME... (power on or reset target now)
(Serial Port): Read error: 由于线程退出或应用程序请求，已放弃 I/O 操作。

(AIS Parse): BOOTME received!
(AIS Parse): Performing Start-Word Sync...
(AIS Parse): Performing Ping Opcode Sync...
(AIS Parse): Processing command 0: 0x58535901.
(AIS Parse): Performing Opcode Sync...
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(Serial Port): Read error: The operation has timed out.
(AIS Parse): I/O Error in read!
(AIS Parse): Opcode Sync failed after 11 consecutive I/O failures.
(AIS Parse): Boot aborted.
(Serial Port): Closing COM1.

使用UART BOOT时，PC用超级终端能 收到 BOOTME。

但是JTAG不能连接。UART BOOT 也不能成功，请问为什么

SPI BOOT 方式，BOOT 示波器能观测到开始时SPI-CLK 有8个8BIT 方波。

你好，板卡上是否有复位按钮，在连接CCS之前，按复位键再connection，试试。

如果还不行，建议测试JTAG的信号是否正常，还有能否把无法连接的报错发上来？