CPLD input pin disabling using DEV_OE pin

Altera_Forum · ‎11-24-2010

Hello everybody,

In the MAXII CPLD handbook there is mention made of a DEV_OE pin

which can be used to tristate the outputs of a CPLD for certain cases.

if this option is turned on, all outputs on the chip operate normally when dev_oe is asserted. when the pin is deasserted, all outputs are tri-stated.

However, what happens to the inputs in this situation ?

Thanks,

Eric

Altera_Forum · ‎11-24-2010

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what happens to the inputs in this situation

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Obviously nothing.

Altera_Forum · ‎01-27-2011

hello,

I have a question about OE pins. For the max 7000s devices, it does talk about these global control signals for OE and the pins are there. However in quartus, the option for enabling OE is not there for these devices. After compilation, the report for fitter Fitter Device Options lists Enable device-wide output enable (DEV_OE) as off. Yet, I don't see where that setting can be changed. Does that option exist for that device family?

Thanks.