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Altera_Forum
Honored Contributor I
972 Views

DE2-70 Flash

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.
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3 Replies
Altera_Forum
Honored Contributor I
43 Views

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
Honored Contributor I
43 Views

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
Honored Contributor I
43 Views

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

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