DE2-70 Flash

Question

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.

altera_forum · Answer

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[15] and address[0], as they are never used at the same time.

altera_forum · Answer

Understand. So, in summary

1. 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.

altera_forum · Answer

Are you running this flash using standard CFI controller from sopc builder?

Forum Discussion