VSC8211XVW Vitesse Semiconductor Corp, VSC8211XVW Datasheet - Page 43

• Manufacturer Part Number: VSC8211XVW
• Description: IC PHY 10/100/1000 SGL 117-LBGA
• Manufacturer: Vitesse Semiconductor Corp
• Type: PHY Transceiverr

Specifications of VSC8211XVW

• Number Of Drivers/receivers: 1/1
• Protocol: Gigabit Ethernet
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 117-LBGA
• Case: BGA
• Dc: 07+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 907-1023

11 Twisted Pair Interface
The twisted pair interface on the VSC8211 is fully compliant with the IEEE802.3-2000 specification for CAT-5 media. All passive
components necessary to connect the PHY to an external 1:1 transformer have been integrated into the VSC8211. The
connection of the twisted pair interface is shown in the following figure:
Unlike other Gigabit PHYs, which do not integrate line terminations into the PHY, the VSC8211 device’s twisted pair interface is
compatible with a wide variety of standard magnetics and RJ-45 modules from common module vendors. Depending on the
application (the number of ports, EMI performance requirements such as FCC Class A or B, the type and quality of the
equipment shielding, and other EMI design practices in place, for example), the twisted pair interface may be used with
standard (12- or 8-core) magnetics as well as SimpliPHY’d (4-core) magnetics modules available from many module vendors.
In addition, this interface is also used to provide support for 100Mbps fiber module connection. For more information on the
suitability of using SimpliPHY’d magnetics for a particular design, see the application note SimpliPHY’d Magnetics and EMI
Control, available from the Vitesse website.
11.1 Twisted Pair Autonegotiation (IEEE802.3 Clause 28)
The VSC8211 supports twisted pair autonegotiation, as defined in IEEE 802.3-2002 clause 28. (However, autonegotiation is not
defined by IEEE for the 100BASE-FX mode and is therefore not supported.) This process evaluates the advertised capabilities
of the local PHY and its link partner to determine the best possible operating mode. In particular, autonegotiation can determine
speed, duplex, and MASTER/SLAVE modes for 1000BASE-T. Autonegotiation also allows the local MAC to communicate with
the Link Partner MAC (via optional “Next-Pages”) to set attributes that may not be defined in the standard. If the link partner
does not support autonegotiation, the VSC8211 will automatically use parallel-detect to select the appropriate link speed.
Clause 28 twisted-pair autonegotiation can be disabled by clearing bit MII Register bit 0.12 – Auto-Negotiation Enable. If
autonegotiation is disabled, the operating speed and duplex mode of the VSC8211 is determined by the state of MII Register
bits 0.13, 0.6 – Forced Speed Selection and MII Register bit 0.8 – Duplex Mode. For more information, see
Mode Control Register - Clause 28/37 View”
VMDS-10105 Revision 4.1
October 2006
VSC8211
PHY Port
TXVNA
TXVNB
TXVPC
TXVNC
TXVPD
TXVND
TXVPA
TXVPB
Figure 15. VSC8211 Twisted Pair Interface
on page 85.
*
SimpliPHY’d magnetics can be used.
For information, refer to the SimpliPHY’d Magnetics
application note.
43 of 165
0.1µF
0.1µF
0.1µF
0.1µF
*
75
75
75
75
1
2
3
6
4
5
7
8
A+
A-
B+
B-
C+
C-
D+
D-
S1
1000pF, 2kV
RJ-45
J1
S2
“Register 0 (00h) –
Datasheet
VSC8211