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參數(shù)資料
| 型號(hào)： | L80600 |
| 英文描述： | L80600 10/100/1000 Mbits/s Ethernet PHY technical manual 3/01 |
| 中文描述： | L80600 10/100/1000 Mbits /秒以太網(wǎng)PHY技術(shù)手冊(cè)3月1日 |
| 文件頁(yè)數(shù)： | 181/192頁(yè) |
| 文件大?。?/td> | 1344K |
| 代理商： | L80600 |
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9-7
10. Take the L80600 out of power down mode (reset bit 11 of
register 0x00.)
Q10
: How long does AutoNegotiation take
A10
: Two L80600s typically complete AutoNegotiation and establish
1000 Mbits/s operation within 5 seconds. 1000BASE-T AutoNegotiation
process takes longer than the 10/100 Mbits/s. One of the reasons for this
is the use of Next Page exchanges during 1000 Mbits/s negotiation.
Q11
: I know I have good link, but register 0x01, bit 2 “Link Status” is not
set to 1 (indicating good link).
A11:
This bit is defined by IEEE 802.3u Clause 22. It indicates if the link
was lost since the last time this register was read. Its name (given by
IEEE) is perhaps misleading. A more accurate name would have been
the “Link Lost” bit. If the actual present link status is desired, then either
this register should be read twice, or register 0x11 bit 2 should be read.
Register 0x11 shows the actual status of link, speed, and duplex
regardless of what was advertised or what has happened in the interim.
Q12
: I have forced 100 Mbit/s operation but the 100 Mbit/s speed LED
doesn’t come on.
A12:
Speed LEDs are actually an AND function of the speed and link
status. Regardless of whether the speed is forced or AutoNegotiated,
there has to be good link before the speed LEDs illuminate.
Q13
: Can you clarify the pull-up or pull-down information
A13:
The pull-up or pull-down information specified in
Chapter 3,
“Signals”
indicates if there is an internal pull-up or pull-down resistor at
the IO buffer used for that specific pin. These internal resistors are
between 25–65 k
. They determine the default strap value if the pin is
left floating. If the default value is desired to be overwritten, an external
1 k
pull-up or pull-down resistor can be used.
Q14
: What are some other applicable documents
A14
:
IEEE 802.3z “MAC Parameters, Physical Layer, Repeater and
Management Parameters for 1000 Mbit/s Operation.”
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