Article ID: 000075801 Content Type: Troubleshooting Last Reviewed: 08/13/2012

Can I connect VCCTRGT (pin 4) of my USB-Blaster or Byte-Blaster II Header to 3.0V when configuring an Altera device that supports a VCCIO and/or a VCCPD of 3.0V, over JTAG?

Environment

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Description VCCTRGT can be connected to 3.0V when configuring Arria® II GX, Stratix® III or Stratix IV series devices over JTAG. This voltage is supported by the USB-Blaster™ and ByteBlaster™ II download cables. However VCCTRGT should not be connected to a voltage greater than 2.5V when configuring Cyclone® III devices over JTAG, as the JTAG input buffers do not have internal clamping diodes and therefore must be protected from overshoot that may exceed the devices absolute maximum AC input voltage specification.

Related Products

This article applies to 6 products

Cyclone® III FPGAs
Stratix® II FPGAs
Stratix® IV GX FPGA
Stratix® IV GT FPGA
Arria® II GX FPGA
Stratix® IV E FPGA

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