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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS89712 датащи(PDF) 67 Page - Cirrus Logic |
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CS89712 датащи(HTML) 67 Page - Cirrus Logic |
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67 / 170 page  CS89712 DS502PP2 67 2.36 Auto-Negotiation Considerations The original IEEE 802.3 specification requires the MAC to wait until 4 valid link-pulses are received before asserting Link-OK. Any time an invalid link-pulse is received, the count is restarted. When auto-negotiation occurs, a transmitter sends FLP (Fast Link Pulse) bursts instead of the original IEEE 802.3 NLP (Normal Link Pulses). If the hub is attempting to auto-negotiate with the CS89712, the CS89712 will never get more than 1 "valid" link pulse (valid NLP). This is not a prob- lem if the CS89712 is already sending link-pulses, because when the hub receives NLPs from the CS89712, the hub is required to stop sending FLPs and start sending NLPs. The NLP transmitted by the hub will put the CS89712 into Link-OK. However, if the CS89712 is in Auto-Switch mode, the CS89712 will never send any link-pulses, and the hub will never change from sending FLPs to sending NLPs. |
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