01-04-2011 06:08 PM
I am working on DE2-70 now and trying to program ELF into the onboard flash.Questions, 1. In SOPC builder, CFI + Avalon-MM Tristate Bridge, 16 bit WORD MODE. The address bus generates 23 bits, but onboard flash can take only 22 bits 2. If use Altera UP IP DE2-70 FLASH, DQ is only 8 bits? Can somebody post a detailed description on how to make it work? Thanks alot.
01-07-2011 01:22 PM
1) That is normal.For 16bit connection, you do not need the lowest address bit, just don't connect it. Some flash manufacturers commonly use the same pin for data and address, as they are never used at the same time.
01-09-2011 05:50 PM
Understand. So, in summary1. BYTE MODE, ADDR_AM1_DQ is address bus LSB 2. WORD MODE, ADDR_AM1_DQ is data bus MSB, ADDR_LSB can be anything, 0 or 1. I am able to use DE2-70 onboard flash in BYTE MODE now. No luck on WORD MODE yet.