Hello,
I have two questions about the hardware design of the PCB of the new LeopardBoard 368 (compared to the 365):
- why were all Resistor Networks replaced with single Resistors? It's the same result right? And RN take less space so why the change?
- why were the terminator Resistors removed between the DDR and the DM368 (cf. page 2)? We don't need them at all at these high frequencies?
Thanks!
Resistor Networks are so tiny that it could cause trouble in assembly. That is why they were replaced with single resistors or removed.
The DDR works well without the resistor terminators. However, if you want to go to production, those resistors are recommended for reducing EMI.
gentlemich Hello, I have two questions about the hardware design of the PCB of the new LeopardBoard 368 (compared to the 365): - why were all Resistor Networks replaced with single Resistors? It's the same result right? And RN take less space so why the change? - why were the terminator Resistors removed between the DDR and the DM368 (cf. page 2)? We don't need them at all at these high frequencies? Thanks!
OK that clarifies things.
I want to use the same DDR (MT47H64M16HR-25) but instead I found the following: MT47H64M16HR-25E. I wonder if that makes any difference regarding the memory access in the software...
MT47H64M16HR-25E should work. It is faster than the MT47H64M16HR-25.
Can we replace the Resistor Networks on the DDR lines and use Impedance Control during the manufacturing process instead?