VSC8211XVW Vitesse Semiconductor Corp, VSC8211XVW Datasheet - Page 44

• 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

11.2 Twisted Pair Auto MDI/MDI-X Function
For trouble-free configuration and management of Ethernet links, the VSC8211 includes robust Automatic Crossover Detection
functionality for all three speeds on the twisted pair interface (10BASE-T, 100BASE-TX, and 1000BASE-T) – fully compliant with
the IEEE standard. In addition, the VSC8211 detects and corrects polarity errors on all MDI pairs, beyond what is required by
the standard. Both the Automatic MDI/MDI-X and Polarity Correction functions are enabled by default. However, complete user
control of these two features is available using bits 5 and 4 of the Bypass Control register. For more information, see
18 (12h) – Bypass Control Register”
Auxiliary Control & Status
The VSC8211’s Automatic MDI/MDI-X algorithm will successfully detect, correct, and operate with any of the MDI wiring pair
combinations listed in the following table:
11.3 Auto MDI/MDI-X in Forced 10/100 Link Speeds
The VSC8211 includes the ability to perform Auto MDI/MDI-X even when auto-negotiation is disabled (MII Register 0.12 = 0)
and the link is forced into 10/100 link speeds. In order to enable this feature, additional MII register write settings are also
needed in the following order:
To enable Auto MDI/MDI-X in forced 10/100 link speeds:
•
•
•
•
•
•
•
•
•
To disable Auto MDI/MDI-X in forced 10/100 link speeds:
•
VMDS-10105 Revision 4.1
October 2006
Write MII Register 31 = 0x2A30
Write MII Register 8 = 0x0212
Write MII Register 31 = 0x52B5
Write MII Register 2 = 0x0012
Write MII Register 1 = 0x2803
Write MII Register 0 = 0x87FA
Write MII Register 31 = 0x2A30
Write MII Register 8 = 0x0012
Write MII Register 31 = 0x0000
Write MII Register 31 = 0x2A30
Combinations
Accepted by
Register.
Connection
VSC8211
MDI Pair
Table 16. Accepted MDI Pair Connection Combinations
on page 103. Status bits for each of these functions are located in
1,2
A
B
A
B
RJ-45 Connections
3,6
B
A
B
A
44 of 165
4,5
C
C
D
D
7,8
D
D
C
C
Normal MDI mode
Normal DTE/NIC mode
No crossovers
MDI-X mode
Normal for switches & repeaters
Crossover on A and B pairs only
Normal MDI mode
Normal for DTEs (NICs)
No crossovers
Pair swap on C and D pairs
Normal MDI-X mode
Normal switch/repeater mode
Crossovers assumed
Crossover on A and B pairs
Pair swap on C and D pairs
Comments
Register 28 (1Ch) –
Datasheet
VSC8211
“Register