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AR# 22496

Spartan-3E - How is the HSWAP pin connected internally?

描述

How is the HSWAP pin connected internally? Can I connect the HSWAP pin to VCCAUX?

解决方案

The HSWAP pin is a dual-purpose pin in Spartan-3E devices, and it has an internal pull-up resistor connected to VCCO_0. However, we recommend using an external 4.7k resistor to pull the HSWAP pin High or Low.

You can connect the HSWAP pin to VCCAUX, but be aware that an internal upper clamp diode is connected to VCCO. Forward-biasing this clamp diode will conduct a reverse current into the VCCO rail, but the current will be limited by the external pull-up to VCCAUX.

AR# 22496
日期 12/15/2012
状态 Active
Type 综合文章
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