I stumbled on quite good, easy to understand post on BGA package and using it on PCB. No VLSI chips mentioned.
VS23S040 users may find it useful to get some confidence on designing a PCB footprint and routing if BGA components aren't used commonly.
The article can be seen in
Disclaimer: No responsibility of any kind. The link is given to an external service and is not related in any way to VLSI Solution. Link is given in good faith that information is useful.
Designing hardware and software that uses the VS23S0X0 family of ICs as a 8-bit or SPI SRAM memory or as a Video Controller for generating Composite Video (TV-Out) or driving other kinds of displays.
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