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VSC8504-02 датащи(PDF) 30 Page - Microsemi Corporation

номер детали VSC8504-02
подробное описание детали  Quad-Port 10/100/1000BASE-T PHY with Synchronous Ethernet and QSGMII/SGMII MAC
PDF  131 Pages
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производитель  MICROSEMI [Microsemi Corporation]
домашняя страница  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC8504-02 датащи(HTML) 30 Page - Microsemi Corporation

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Functional Descriptions
VMDS-10507 VSC8504-02 Datasheet Revision 4.2
19
Figure 21 •
3.3 V CMOS Single-Ended REFCLK Input Resistor Network
Figure 22 •
5 V CMOS Single-Ended REFCLK Input Resistor Network
Note: A single-ended 25 MHz reference clock is not guaranteed to meet requirements for QSGMII MAC
operation.
3.7.3
Differential REFCLK Input
AC coupling is required when using a differential REFCLK. Differential clocks must be capacitively
coupled and LVDS compatible. The following illustration shows the configuration.
Figure 23 •
AC Coupling for REFCLK Input
3.8
Ethernet Inline Powered Devices
The VSC8504-02 can detect legacy inline powered devices in Ethernet network applications. Inline
powered detection capability is useful in systems that enable IP phones and other devices (such as
wireless access points) to receive power directly from their Ethernet cable, similar to office digital phones
receiving power from a private branch exchange (PBX) office switch over telephone cabling. This type of
setup eliminates the need for an external power supply and enables the inline powered device to remain
active during a power outage, assuming that the Ethernet switch is connected to an uninterrupted power
supply, battery, back-up power generator, or other uninterruptable power source.
For more information about legacy inline powered device detection, visit the Cisco Web site at
www.cisco.com. The following illustration shows an example of an inline powered Ethernet switch
application.
V
DD1A
V
SSA
270
Ω
430
Ω
3.3 V
CMOS
REFCLK_P
REFCLK_N
V
DD1A
V
DD1A
V
SSA
430
Ω
300
Ω
5 V
CMOS
REFCLK_P
REFCLK_N
V
DD1A
50
Ω
50
Ω
REFCLK_P
REFCLK_N
V
TT (Internal Voltage)
PHY Equivalent
Termination Circuit
0.1 µF
0.1 µF



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