Part Number: TMS320C6748
Other Parts Discussed in Thread: TPS3823, TPS3825, TPS3828, TPS3820, TPS3824
Hi Sreenivasa,
Thanks for your support of TMS320C6748.
Hi Xiang long,
Would you like give more reset issue description about the TMS320C6748E? @XIANG LONG
BR
Cayden
The problem is as follows:
The program has been burned into 6748 and extended to EMIFA's 8bit NAND. In the cmd file, some of the code is defined in L2 space and some is defined in the 16bit SDRAM of EMIFA extension. If it is powered on and reset, the program can successfully load every time and all functions are running normally. But our product has designed an external reset circuit, which connects the reset signal to the RST signal of 6748. If the signal is output at a low level, there is a 50% probability that 6748 cannot successfully reset the load. The boot configuration pins have been checked for any design errors.
In addition, our 6747 product is also designed in the same way: it uses the same reset circuit design, and the 6747 system uses the same NAND and SDRAM. Our 6747 product has never encountered this problem before
The reset circuit is as follows：
Additionally, I would like to add that when a reset is triggered on the HMI product, the final output signal (/RST) waveform to the 6748-RST pin is as follows:
As shown above, the decrease time of the/RST signal is approximately 400us, and the low-level duration is about 300ms. This waveform has been triggered multiple times on our HMI product. Sometimes 6748 can be loaded, sometimes it cannot be loaded (but as long as the system is powered on and reset, 6748 can be successfully loaded)
