AR# 34219

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Virtex-6 MMCM - Cascaded MMCMs may not work in hardware

描述

In the Virtex-6 FPGA,cascaded MMCMs may not work in hardware. The behavior seen is that the second MMCM in the chain does not lock.

解决方案

The ISEimplementationsoftware automatically selects the COMPENSATION mode for thecascaded MMCM. In some cases, the software does not set this attribute correctly.The workaround to this issue is to manually set theCOMPENSATIONattribute to CASCADE for the second MMCM in the user design. This issue will be fixed in ISE 12.4 software.
AR# 34219
日期 05/19/2012
状态 Active
Type 已知问题
器件 More Less
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