HBLXT9785HE.D0 Intel, HBLXT9785HE.D0 Datasheet - Page 123

• Manufacturer Part Number: HBLXT9785HE.D0
• Manufacturer: Intel

Specifications of HBLXT9785HE.D0

• Lead Free Status / RoHS Status: Not Compliant

LXT9785/LXT9785E
Datasheet
249241, Revision 11.0
16 April 2007
4.4.2.5
Note:
4.5
4.5.1
4.5.2
Cortina Systems
RxCLK Signal (SS-SMII Only)
In SS-SMII mode, the LXT9785/LXT9785E provides a 125 MHz clock output in reference
to the output RxDatan. RxCLK is referenced and synchronized to the REFCLK. See
Figure 23 on page
Although RXCLK is referenced to REFCLK, the RXCLK may vary in cumulative phase by
up to four bit-times relative to REFCLK.
Initialization
When the LXT9785/LXT9785E is first powered on, reset, or encounters a link failure state,
it checks the MDIO register configuration bits to determine the line speed and operating
conditions to use for the network link. The configuration bits may be set by the Hardware
Control or MDIO interface as shown in
MDIO Control Mode
In the MDIO Control mode, the LXT9785/LXT9785E reads the Hardware Control Interface
pins to set the initial (default) values of the MDIO registers. Once the initial values are set,
bit control reverts to the MDIO interface.
Hardware Control Mode
In the Hardware Control Mode, the LXT9785/LXT9785E disables direct write operations to
the MDIO registers via the MDIO Interface. On power-up or hardware reset, the LXT9785/
LXT9785E reads the Hardware Control Interface pins and sets the MDIO registers
accordingly.
The following modes are available using either Hardware Control or MDIO Control:
When the network link is forced to a specific configuration, the LXT9785/LXT9785E
immediately begins operating the network interface as commanded. When auto-
negotiation is enabled, the LXT9785/LXT9785E begins the auto-negotiation/ parallel-
detection operation.
®
• Force network link to 100BASE-FX (Fiber).
• Force network link operation to:
• Allow auto-negotiation/parallel-detection.
• Auto/Manual MDIX enable/disable.
• Pause for full-duplex links operation.
• Global Output Slew Rate Control.
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
— 100BASE-TX, Full-Duplex
— 100BASE-TX, Half-Duplex
— 10BASE-T, Full-Duplex
— 10BASE-T, Half-Duplex
137.
Figure 13 on page
124.
4.5 Initialization
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