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Altera_Forum's avatar
Altera_Forum
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19 years ago

how to slow down communication for LCD

Dear all, i've hacked the driver of 16x2 to get 20x4 LCD display. It works, but the problem is, that I need to connect the display via quite long flat cable, which is of course not terminated,...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

On Cyclone II chips (probably Cyclone too) you can use driver strength to reduce reflections on the cable. Set all signals to 4mA (for write enable 8mA may be a better option).

If you are using a different chip, check if supports any of the following parameters:

- current (driver) strength

- slow slew rate

- series termination

For a list of Quartus Logic Options search the Quartus help for "Logic Options (list of)".

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