This ngpc circuit is correct？

[Thomas]

The problem is that the original cartridges used very specific flash chips that you can not purchase.  The NGPC will query parts of the chip to get information about the chip, and there are no commercially available chips that will respond correctly.  The NGPC itself will see these invalid responses and then will reject the cartridge.  This is why you can't just use a single flash chip.]

I believe that the above circuit is correct, but I don't think you can use it to make a cartridge that will boot up on a NGPC.  Well, this would work if you use a flash chip from an official cartridge, but the cartridge would not be writeable.

Thank you very much！ So the best way is to purchase one “Flash master usb“ cartridge.
But I'm interstd in  how does the cartridge boot up. What‘s the communication protocol，
Is there any detailed datasheet？