參數(shù)資料
型號(hào)： KSZ9021GQI
廠商： Micrel Inc
文件頁(yè)數(shù)： 17/59頁(yè)
文件大?。?/td> 0K
描述： TXRX GIG ETH GMII/MII 128-PQFP
標(biāo)準(zhǔn)包裝： 66
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 8/8
規(guī)程： 千兆位以太網(wǎng)
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 128-BFQFP
供應(yīng)商設(shè)備封裝： 128-PQFP（14x20）
包裝： 托盤
其它名稱： 576-3790
Micrel, Inc.
KSZ9021GQ
September 2010
24
M9999-091010-1.2
Figure 3. Auto-Negotiation Flow Chart
For 1000Base-T mode, auto-negotiation is required and always used to establish a link. During 1000Base-T auto-
negotiation, the Master and Slave configuration is first resolved between link partners, and then the link is established with
the highest common capabilities between link partners.
Auto-negotiation is enabled by default at power-up or after hardware reset. Afterwards, auto-negotiation can be enabled
or disabled through register 0 bit 12. If auto-negotiation is disabled, the speed is set by register 0 bits 6 and 13, and the
duplex is set by register 0 bit 8.
If the speed is changed on the fly, the link goes down and either auto-negotiation or parallel detection will initiate until a
common speed between KSZ9021GQ and its link partner is re-established for a link.
If link is already established and there is no change of speed on the fly, then the changes will not take effect unless either
auto-negotiation is restarted through register 0 bit 9, or a link down to link up transition occurs (i.e., disconnecting and
reconnecting the cable).
After auto-negotiation is completed, the link status is updated in register 1 and the link partner capabilities are updated in
registers 5, 6, and 10.
The auto-negotiation finite state machines employ interval timers to manage the auto-negotiation process. The duration of
these timers under normal operating conditions are summarized in the following table.
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