Forum Discussion

HI51's avatar
HI51
Icon for New Contributor rankNew Contributor
11 months ago

Agilex5のHVIOバンクのピンの状態および最大周波数について

・Agilex5のHVIOバンクの電源起動後のピンの状態について教えてください　 電源起動後、コンフィギュレーション中のユーザーモードに入るまでのピンの状態を教えてください。「General-Purpose I/O User Guide: Agilex 5 FPGAs and SoCs」では「All pins are tri stated.」と記述があり、プルアップ、プルダウン抵抗なしの状態...
AqidAyman_Altera's avatar
AqidAyman_Altera
Icon for Regular Contributor rankRegular Contributor
11 months ago

Hello,


Regarding the pins' condition, both statements are correct. However, the Device Configuration User Guide is more precise:


The pins are tri-stated (high impedance, Hi-Z) and, additionally, there is a weak pull-up resistor enabled during configuration. This means the pins will float high (toward VCCIO) but not drive any significant current.


For the second question, the Data Sheet often focuses on absolute maximum ratings and DC/AC characteristics. Device Datasheet may not explicitly state the numbers, but the User Guide's values are considered authoritative for board-level design.


Regards,

Aqid