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CS89712 bảng dữ liệu(PDF) 67 Page - Cirrus Logic

tên linh kiện CS89712
Giải thích chi tiết về linh kiện  HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH 10BASE-T ETHERNET CONTROLLER
PDF  170 Pages
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nhà sản xuất  CIRRUS [Cirrus Logic]
Trang chủ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS89712 bảng dữ liệu(HTML) 67 Page - Cirrus Logic

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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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