我有一个包含单个Spartan3-DSP XC3SD3400A的新
电路板。
我无法通过JTAG或串行SPI闪存对器件进行编程。
我可以通过iMPACT对闪存芯片进行编程,但是当我对电路板进行
电源循环时,CCLK,CSO_B,MOSI或MISO引脚上没有活动,它们都处于0V。
JTAG接口也会因为TDO没有切换但是会出现TCK信号的耦合“重影”而失败。
我在下面添加了一些JTAG跟踪。
电源导轨看起来都很好看。
从任何JTAG信号到彼此或接地都没有明显的短路。
任何建议,将不胜感激。
TCK v TDO
TCK v TMS
TCK v TDI
谢谢
戴夫
以上来自于谷歌翻译
以下为原文
I have a new board containing a single Spartan3-DSP XC3SD3400A.
I am unable to program the device either from JTAG or from a serial SPI flash.
I can program the flash chip OK via iMPACT but when I power cycle the board there is no ac
tivity on the CCLK, CSO_B, MOSI or MISO pins, they are all at 0V.
The JTAG interface also falls over as TDO does not toggle but exhibits a coupled 'ghost' of the TCK signal.
I have added some JTAG traces below.
The power rails all look good & there are no obvious shorts from any of the JTAG signals to each other or to ground.
Any suggestions would be appreciated.
TCK v TDO
TCK v TMS
TCK v TDI
Thanks
Dave
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