Quoted from barakandl:
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I created a new 5101 adapter for people that like to DIY. All through hole components. Jumper out and 7400 installed = dual CE operation. Jumper in and 7400 out = single CE operation. Might offer them up as kits for people buying their own FM1608.
Since it used in a lot of places, you can add just a tiny bit of PC to your design and run a Ground trace along the outer edge to provide all those grounds to unused pins. It would certainly clean up your design a bit. On the layout program I use, it allows me to hand route some traces prior to running the auto route routine. I don't know if you are auto routing or doing it 100% by eye and hand?
Also, remember unless you plan to read out the stored data in the future, you don't need to route A1 -> A1 and D0 -> D0 etc.. You can use any address pin that is closest to an adjoining address pin and the same for any data pin to pin choices. It doesn't matter how the cells in the device are selected internally or where a 1 or 0 is stored on a data pin. Whatever gets written in, will get read out correctly regardless of your choice of address and data pins. This can also drastically clean up a lot of traces and vias if you just look at what you see now and adjust for it and try another routing.
For example: 5101 Pin 1 is A3. 6264 Pin 2 is A12. In your design, they are right next to each other. If you change your schematic to be 5101 A3 -> 6264 A12, you get a short trace going pin to pin instead of scrolling all around and passing through a via to get to pin 7 of the 6264.