Altera MAX3000A OE and GCLR-Pins

Nov 24, 2006 2 Replies
M

Is it essential to connect the unused OE and GCLR-Pins of an Altera MAX3000A to ground??? the Quartus Pin-file shows GND+ for this pins, with the following meaning of GND+:



-- GND+ : Unused input pin. It can also be used to report unused dual-purpose pins.



-- This pin should be connected to GND. It may also be connected to a



-- valid signal on the board (low, high, or toggling) if that signal



-- is required for a different revision of the design. Can I turn on/off the usage of this OE-Pins somewhere in Quartus or where can I see the usage???



Thanks, Manfred


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A

The unused inputs do not affect internal logic; but if you leave a CMOS input floating, there is a risk of charge build-up on the gate capacitance of the input transistors. If the gate voltage is somewhere in-between Vdd and Vss, both the N-channel and P-channel transistors conduct, cuasing an increase in power consumption.

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M

"Andrew Holme" schrieb im Newsbeitrag news:ek7kv8$shu$1$ snipped-for-privacy@news.demon.co.uk...

Thanks for the answer, but it's still not clear to me: Can I turn on/off the usage of this OE and GCLR-Pins somewhere in Quartus or where can I see the usage??? In the block diagrams of the CPLD the OE is a control signal of the "I/O Controll Block" - in my opinion OE is either in use everytime or I have to turn it on/off somewhere!!! How does these pins work? Thanks, Manfred

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