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BrianSune_Froum
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Re: Cyclone IV drop in replacement confirmations
FvM Dear Sir, Stop it. Please stop your replies with all do respect. You referred information from the datasheet and corrects me in previous reply and said the input for VCCIO is subjected to the table from 1.8Vccio aka 2.25 Vmax not the front table VIN max. Stop your replies and free Altera to response. For community help and more clear message stop your madness immediate! Deep appreciation!!! BrianRe: Cyclone IV drop in replacement confirmations
AqidAyman_Altera The table I attached is from the "Pin Migration view". Yes datasheet Larger die -> smaller die migrate. Which is understandable from the idea of 1.8V / 1.5V VCCIO minimum requirements so 1.2Vcore/GND is always treaded as input / HI-Z and does not contradicts the voltage requirements. But the issue we are discussing is VCCA in that table which larger die have more PLL power pins. So drop-in migration have no clear details on such. 3.6V is maximum input but VCCIO aka 1.8V vs 2.5Vcca fixed power pin require Altera to response the proper drop-in design/treatment. Thanks, BrianRe: Cyclone IV drop in replacement confirmations
FvM Well if you read from top to bottom: The table for output uses VCCIO and input Max=3.6V ~ha! If your statement holds, then the output should be a fixed number as well for generalized numbers. My question is not about GPIO use cases, you might argue but ticket is about drop in replacement not standard signal goes high / low with current-limited driver. I will prefer Altera staffs to handle my ticket. Thank youRe: Cyclone IV drop in replacement confirmations
AqidAyman_Altera The question is not related to any specific Cyclone IV devices: The question is about when VCCIO is driven from 1.8V or any voltage under the VCCA, do the input pins are allow to feed in 2.5V or 3.3V as datasheet marked with <3.6V on inputs? When this question is answered there is no issue on the remains drop-in compatibilities. Thanks, BrianCyclone IV drop in replacement confirmations
Dear Altera, If the BANK VCCIO is 1.8V and the same package but with different LE # FPGA is drop in replace. Where the original pin is a VCCA while different LE size same pin is a IO. With 1.8V on VCCIO and input fixed to VCCA aka 2.5V do this introduce any issue? As we can see the datasheet mentioned the DC input accept 3.6 or below. -> Table 1–4. Recommended Operating Conditions for Cyclone IV GX Devices (Part 2 of 2) So the C4 device have a protection forward diode to clamp the voltage when IO is set to input? As long as that pin is fixed to input state do this condition function properly? Thanks, Brian
