TMS320C6678: C6678 DDR write failure

Hello Chmaps,

Customer designed his own board. There are 4 C6678 on board, every C6678 is connected to 8 pieces of 8bit DDR3.

Two C6678 could access DDR3 correctly. The other two c6678 could not write the first DDR. The first DDR address bus is shorter than the data bus. 


Thanks.

Rgds
Shine