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Why does iMPACT version 7.1i and later limit the maximum TCK_CCLK frequency and prevent me from selecting a higher frequency?

Frequency impact later limit maximum selecting version
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Why does iMPACT version 7.1i and later limit the maximum TCK_CCLK frequency and prevent me from selecting a higher frequency?

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Starting with version 7.1i, iMPACT queries the BSDL file of each device detected in a chain and automatically limits the maximum TCK_CCLK frequency to that of the slowest device in the chain. This is provided as a convenience and prevents incorrect (i.e., too-high) TCK_CCLK settings that might cause slower devices to fail during boundary scan operations. The active TCK_CCLK frequency is displayed in the lower right corner of the iMPACT window.

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