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AR# 21386

LogiCORE SPI-4.2 (POS-PHY L4) - How do I choose between Global Clocking and Regional Clocking?

Description

How do I choose between Global Clocking and Regional Clocking?

Solution

Both regional clocking and global clocking with DCM can operate up to 1 Gbps in a Virtex-4 device. Regional 

clocking requires fewer clock resources than global clocking with DCM; however, it places 

an area restriction on the logic that uses the regional clock. See the "Constraining The Core" section of the SPI-4.2 User Guide.

AR# 21386
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article