I've been posting questions about unused balls to e2e.ti.com/.../593504, but that thread has gotten too long and some loose ends are getting lost. So here is a wrap-up of the unanswered questions:
Yordan Kovachev said "However, I think there is something missing in the Data Manual (I am checking this with the documentation team).. The DQS & CLKOUT signals, which are differential signals should be tied (to ground or power supply) as described in the Schematic Checklist. I will check this further and elaborate here. "
Yordan also said "For the differential clock out input, I think you need to follow 3.3 Unused Clock Inputs from Hardware design guide for keystone II devices (www.ti.com/.../sprabv0.pdf). See also 6.8.3 Unused DDR3 Pin Requirement from the same document. Again I will verify this and elaborate furhter. "
I asked "Can you clarify the requirement in Table 4-29 for balls T4 and T1? They are required to have external pulldowns if unused. I am unsure about what "unused" means in this context because according to Table 4-1 they have only one function, UART0_RXD and UART0_TXD and are configured to muxmode 0 on reset release. They have pullups during reset, so it seems to me that the pullups would conflict with the required pulldowns and pull them to a mid-voltage state."
Any further word on these points?
Regards,
Debora
