AR# 40416


6 Series - Are these devices hot-swap compliant?


Are 6 series devices (Virtex-6, Spartan-6 FPGA) hot-swap compliant?


Virtex-6 FPGA
These devices are hot-swap compliant. However, there are certain power-sequencing requirements that must be met (see page7 of DS152, Virtex-6 data sheet: for details).
Virtex-6 has clamp diodes to VCCO, similar to Virtex-II Pro, Virtex-4, Virtex-5 FPGA,etc., which means that the currentthrough them shouldbe limited in case Vin is applied before VCCO. The maximum current through a pin is 10 mA, as stated in the data sheet.
XAPP251 ( applies to Virtex-6 devices. See this application note for more information on hot swapping.This application note applies to all devices with a clamp diode to VCCO / GND, including Virtex-6 FPGA.

Spartan-6 FPGA
The Spartan-6 is Hot-swap compliant as stated in the Spartan-6 Family Overview data sheet (DS160).These devices do not have clamp diodes to VCCO, so there are lessrestrictions. The Spartan-6 FPGA input voltage is independent of VCCO (see Table 1, page 1 of DS162, Spartan-6 data sheet for details:
In Table 2, page 3, of the DC and Switching data sheet (DS162), you can see that you can safely apply a voltage up to 3.95V maximum to the I/O without destroying it.

Diodes are only available for PCI standards - If a Customer is using a PCI standard, then the diodes would exist and the hot-swap/hot-plug compatibility follows the usual rules: the current through the I/Os should be limitedand Vinshould beapplied before VCCO.



Answer Number 问答标题 问题版本 已解决问题的版本
51834 SelectIO Design Assistant - Reliability and over driving IOs. N/A N/A
AR# 40416
日期 10/16/2013
状态 Active
Type 综合文章
器件 More Less
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