PIPE Txdatak, RxdataK

Hi all,

I am a beginnner in PCI express and PIPE specifications. I have a doubt in two PIPE signals. There are two signals with names TxDataK and RxDataK which are 2 bit signals. The description for these two signals says they signify whether the incoming/outgoing byte is a Data byte or a control byte.

There is no proper waveform which says the difference between a data byte and a control byte either in PIPE spec/PCIe spec. Could someone please tell me what is the difference between a data byte and a control byte?

Thanks

Shiva

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