Dear,
[size=0pt]On the developement board VC707, XC7VX485T-2FFG1761 has no 2.5V HR I/O or 3.3V HR I/O, instead, it has only 1.8V HR I/Os.[/size]
[size=0pt]VADJ and the level of VCCO is 1.8V at the most on board VC707, which can cause a problem when FMC126 mounting on the FMC1 interface of board VC707. [/size]
[size=0pt]There is only one bank of XC7VX485T-2FFG1761 powered by FMC1_VIO_B_M2C, which is strangely supplied by FMC126.[/size]
[size=0pt] In theory, FMC1_VIO_B_M2C should be 1.8V, but unfortunately, it is only 1.67V, which can not reach the minimum requirement of 1.71V.[/size]
[size=0pt]Maybe the input(VADJ from VC707) to the LDO in FMC126 is just 1.8V [/size] [/size][size=0pt], so the output cannot be up to 1.8V. And in ML605, the VADJ is 2.5V, the [/size][/size]FMC_VIO_B_M2C is 1.8V and everything is OK.
[/size][size=0pt] As a result, FMC126 can not transmit data to XC7VX485T-2FFG1761, and we can not get A/D data using chipscope. [/size]
In a word, FMC126 requires that the VADJ form VC707 is 2.5V, but VC707 just outputs 1.8V.[/font]
[size=0pt]Why does this happen? Please do me a favor and give me a solution.[/size]