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FT82x

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armadafg:
ok i understand better.
For this screen in question the frequnce max is 50mhz, so the best conbinaison with the ft811 or bt81x is 30Mhz ?
And for the bt81x it is necessary to find a screen with 72mhz max to use all this capacity? That's right ?

FTDI Community:
Hello,

In general most displays target around a 60 fps refresh rate, as such settings are chosen to achieve this. In the previous example the clock was divide down to 30Mhz as this number combined with the HCYCLE and VCYCLE values got use very close to this desired number (60). It is normal practice to divide PCLK by 2 or more to achieve the desired frequency which best fits the display being used.
It is not the intended use of EVE to run at 'full tilt' with a display that can match the overall system clock of the IC.

Best Regards,
FTDI Community

armadafg:
Hi,

If the bt82x is designed for the 60ips in which case the 72Mhz or the 60Mhz is used?

Moreover with the screens of Hotmcu I manage to use the 60Mhz but only if there is not too much elemnt to display on the screen whereas it is indicated in this documentation that it can not exceed the 50Mhz.

Do you know a screen capable of exploiting the 72Mhz?

FTDI Community:
Hello,

The BT81x is capable of implementing a 72Mhz or 60Mhz clock, this is the main clock in the IC. It is the DISPLAYS that are usually designed to operate at 60fps, not the IC. Typically a much lower PCLK is used to drive a display within its design spec.

Sounds like you pushed the display past its spec. and it stopped functioning correctly.

I am unaware of any displays currently which will make use of an 72Mhz PLCK, again lower PLCKs are usually used as displays are targeted to run at 60fps.

Best Regards,
FTDI Community

armadafg:
The screen still works correctly, it is only when there is too much element to display that the image is deformed. If not, it will function properly at about 110ip / s.

If ever a person passing through this forum knows a screen with this ability please share it. ;D

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