I'm working on implementing a custom game boy advance cartrige with the following features:
- 4-16MByte flash rom (bank switched to a 24 pin buss) - 32kbyte save ram (game state save, can be stored in flash rom if needed) - usb-to-pc link - in system reprogramability via usb - hardware assist for MP3/OGG decoding or similar lossy compression (target compression is 8bit, 2-8Kbit/sec, for 30min of audio in
2mbyte of rom)Space is a huge concern, my target board size is 1x2 inches. Plus my target cost in quantitys of 1,000 or more is $10-$15 total for the board and everything. Im looking at using the intell strata flash roms at ~$8 for a 4MByte chip in quantitys so that only leaves me ~$2-$7 for my remaining logic. To keep costs down as well as size Im looking on implementing the rest of the logic in an FPGA or CPLD.
Currently Im looking at the Altera MAX 3000a series of chips. Is there enough power in the max chips to do what I want? What chips would you recomend? Should I just implement the controll logic in an ASIC and pick up an Atmel 8051 for the USB and MP3 decoder?
thanks for your time, David Tucker