Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
21327 Discussions

If transceiver not used,should power connected?

Altera_Forum
Honored Contributor II
‎08-11-2010 06:26 AM
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I'm designing a pcb with an EP4CGX110 in it.I'am not going to use the transceiver part, so can i just leave the VCCL_GXB VCCH_GXB VCCA_GXB and the differential IO not connected? 

 

And is there any demo board design released by altera for CYCLONE IV? 

 

Thank you.
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Altera_Forum
Honored Contributor II
‎08-11-2010 06:33 AM
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I guess, it's exactly specified in the datasheet. 

 

Previous GXB devices (e.g. Arria) has these requirements: 

- Power all supply voltages 

- Connect all unused differential inputs to a (common) pair of weak pull-up/pull-down resistors 

It's most likely correct for Cyclone IV, too.
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Altera_Forum
Honored Contributor II
‎08-11-2010 05:58 PM
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definitely check out the Schematic Review Worksheets and the Pin Connection Guidelines they are derived from: 

 

http://www.altera.com/download/board-layout-test/schematic-review-ws/srw-index.jsp
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