Pause Frame transmission

I would like to understand in more detail on how often should I transmit Pause frame from the chip I am designing.

The Pause frame timer value inserted in the frame depends on:

1. The Buffer on my side is getting almost full
2. The Network cable length (round trip delay to the other end)

I need to clarify the following issues:

1. I need some equation, that I need to base on, to compute the timer value that Needs to be inserted in the pause frame . I have a programmable pause timer register that is used to get the value to be inserted.

1. If my buffer is still almost full even after transmitting the first pause frame, what is the timer value I need to insert in the second Pause frame.

2. Second case where my buffer is not full anymore, after transmitting the first pause. But I don't want the other end to wait any more. Should I consider sending another Pause at this time with 0 timer value Or I should have the correct value that should have been sent on the first pause frame.

1. Pause frame is 512 bit time means ??? Does it mean Val= Timer Value * 512 and Every time I transfer 8 bits, the "val" should decrement by 8.

Please answer my questions. If you have any papers that describe about Pause frames, Please send me the URL.

thanks, Nikki

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Posted 5 years ago by niki_tech in Ethernet LAN

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