关于电源模块的处理

365406627 · 发表于 2017-6-12 09:22:24

设计了一块板卡客户反馈不能正常跑，cpu和ddr都要要降频才能运行。而且降得很低才行。初步检查怀疑可能是电源设计的问题，此处需要过6a的电流，世界设计这里有只20mil。只能过1a。请教各位是这个问题吗。因为后面接的是功率电感。会聚集电能再输出。以前设计的时候也是这么处理，都没有问题。只是这次的电流有点太大了
QQ图片20170612091918.png

以下反馈的问题。

2套板子，问题基本一致。

器件为TMS320C6678。
正常情况应该是，连接仿真器后会自动执行gel脚本。gel脚本会执行时钟配置，以及DDR测试等。
目前出的问题是gel执行后，DSP会出错，表现在2个方面
1 正常上电启动DSP后，DSP有一个sysclkout会输出时钟，当前的问题是执行gel后，此时钟会消失
2 执行gel后，仿真器会报如下错误，0x8000014在两个板子上有所区别
C66xx_0: Trouble Writing Memory Block at 0x8000014 on Page 0 of Length 0x4: (Error -1139 @ 0x8000014) Lost debug connection to device. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 5.0.747.0)
C66xx_0: GEL: Error while executing OnTargetConnect(): target access failed    at *((int *) (0x08000000+0x00000014))=0x2100000B [evmc6678l.gel:2322]    at xmc_setup() [evmc6678l.gel:878]    at Global_Default_Setup_Silent() [evmc6678l.gel:576]    at OnTargetConnect() .
IcePick_D: Power Failure on Target CPU
IcePick_D: Failed to remove the debug state from the target before disconnecting.  There may still be breakpoint op-codes embedded in program memory.  It is recommended that you reset the emulator before you connect and reload your program before you continue debugging

降频处理
1  只降DDR即在gel时钟配置里unsigned int PLLM_DDR = 19; 改为 unsigned int PLLM_DDR = 5;上述sysclkout会坚持几十秒才消失。不会报上述2问题但变为

C66xx_0: Power Failure on Target CPU

C66xx_0: Failed to remove the debug state from the target before disconnecting. There may still be breakpoint op-codes embedded in program memory. It is recommended that you reset the emulator before you connect and reload your program before you continue debugging

2 同时降低DSP的主频即pll系数由39改为20或者更低，可以正常运行，连接仿真器载入程序运行。没有报任何错误。