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Visitor
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Registered: ‎07-12-2012

Signal "TXEOPN" of LocalLink DMA incorrect captured by Chipscope

Hello, everyone.

 

I'm using LocalLink DMA to transmit data. My CPU is ppc440 in Virtex 5 FPGA. The ISE is version 11.1. And when I captured the waveform by Chipscope, I found that the signal "TXEOPN" is incorrect, compared to the official TX timing paragraph. The TXEOPN should stay high after the transmitting of frame completed, but in the captured waveform it stay low instead.

 

This is the waveform captured by chipscope:

chipscope captured waveform

 

This is the official TX timing paragraph in document "Embedded Processor Block in Virtex-5 FPGAs.pdf":

official tx timing

Can anyone help me to explain it?

 

Thanks in advance.

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