本帖最后由 wuxinju 于 2012-1-26 19:05 编辑
下载时能找到芯片但下载失败,速率设为4M时如下提示:
programmer '10736' : Scan Chain PASSED.
programmer '10736' : Executing action PROGRAM
programmer '10736' : Failed to enter programming mode.
programmer '10736' : EXPORT ISC_Config_Result[18] = 01251
programmer '10736' : EXPORT ERROR_CODE[16] = 8052
速率率设为1~3M时如下提示:
programmer '10736' : Scan Chain PASSED.
programmer '10736' : Executing action PROGRAM
Error: programmer '10736' : USB read error. Timeout waiting for 3 bytes.
请高手给予解惑
VPUMP接3.3V,VJTAG通过10K电阻上拉到3.3V,VPUMP和VJTAG线上均加了0.1uf和0.47uf的电容。示波器监测VPUMP和VJTAG电压没有波动。TCK,TDO,TMS,TDI和nTRST线均未加上拉或下拉。JTAG_SEL通过1K上拉到3.3V,问题依旧。 |