I've gone through a lot in life so I forgot about what I had been talking about on this forum. This topic has been talked about over and over, but I need answers fast.
I've been reading the datasheet of ATXMEGA128A1U and XMEGA AU to see if it's really possible to use all 24 address bits/pins. It doesn't say so anywhere. Someone wrote on the forum that a 4.5-port mode actually works, but it hasn't been documented and I cannot find a correct connection in the datasheet that describes the pinout for such an EBI mode.
I'm expecting something like PORTH=Data, PORTJ=Addr8, PORTK=Addr16, PORTE=Addr24, PORTF.0=Read, PORTF.1=Write. I'm not sure how to activate it and how to test these pins because my Xplained board has a hardwired SRAM with latches and no pins for it available as a header to test with an oscilloscope. I want no latches because I saw the diagrams of EBI timing and that it would be extremely slow to use latches or an 8MB SDRAM. I want to know if there's an 8MB SRAM, but I couldn't find it anywhere. It's gotta exist somewhere. It needs to be 8MB instead of 16MB because I'm planning to use the 24-th pin/bit for accessing the display and it needs to be the most RAM-having 8-bit game console ever with the fastest display that renders with DMA that sends bytes scanline by scanline.
For my project that I've been talking about for a while now and because of which I became so boring to you all probably, I need to make a PCB with that XMEGA and SRAM as well as a proper connector for the display so I need to know the correct pinout for this 4.5-port EBI. Does anyone know that pinout? Does anyone know if there's an 8MB SRAM?