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Altera_Forum's avatar
Altera_Forum
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20 years ago

Create a new componet(Avalon tristate)

1) As the components are share the system data/ address bus in the custom board, so we should "share" the bus. Then we found there is no "place" to set "is share " opition, only in the "trista...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Do you use an 8, 16 or 32-bit data bus off-chip?

In any case, I would suggest you use Native (Registered) mode, and connect the SOPC A2 signal to the A0/RS0 on the LCD controller device. "Wasting" a few addresses like this is completely irrelevant.

Your code would then do:

IORD_8DIRECT(LCD_base,0)

IOWR_8DIRECT(LCD_base,0,data8)

IORD_8DIRECT(LCD_base,4)

IOWR_8DIRECT(LCD_base,4,data8)