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Honored Contributor I
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Cyclone IV GX Dev Kit - Board Design Fault of connection to LCD

Hi All, 

 

Just to let you all know that there is a design fault on Cyclone IV GX Dev Kit (DK-DEV-4CGX150N) which can potentially stop the LCD display from working. 

 

The LCD is a 2.5V tolerant part but unfortunately, LCD_Data[4] is connected to a 1.8V pin. This means that on my board at least, the LCD doesn't reliably work. 

 

The schematic for the board is also incorrect. It show LCD_Data[4] being connected to pin C27 (correct) and that C27 is part of bank 6 (incorrect). C27 is in fact part of bank 7.  

 

(As bank 6 is 2.5V and bank 7 is 1.8V you see how the LCD_Data[4] fault occurred). 

 

Altera have acknowledged the schematic error and have sort of vaguely acknowledged the design fault. There is no sign of an errata on the dev kit page though. 

 

Cheers, 

 

Colin
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