Article ID: 000075206 Content Type: Troubleshooting Last Reviewed: 05/21/2013

Preamble Mode Register in 10-Gbps Ethernet MAC Cannot Be Read

Environment

    Quartus® II Subscription Edition
    Ethernet
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Critical Issue

Description

You can only write to the RX Preamble Control (0x100:0x13F) register in the 10GbE MAC MegaCore function, but you cannot read the value of the register. The value cannot be read because the csr_readdata port is in dangling state and it is not connected to RX Preamble Control register.

This issue affects all designs that use the RX Preamble Control register in version 13.0 of the 10GbE MAC MegaCore function.

Resolution

There is no workaround for this issue.

This issue will be fixed in a future version of the 10GbE MAC MegaCore function.

Related Products

This article applies to 1 products

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