lan9420 Standard Microsystems Corp., lan9420 Datasheet - Page 146

• Manufacturer Part Number: lan9420
• Description: Lan9420/lan9420i Single-chip Ethernet Controller With Hp Auto-mdix Support And Pci Interface
• Manufacturer: Standard Microsystems Corp.

Revision 1.1 (03-31-08)
4.5.10
12:11
BITS
9:5
3:0
15
14
13
10
4
Override AUTOMDIX_EN Strap
0 = AUTOMDIX_EN configuration strap enables or disables HP Auto MDIX.
1 = Override AUTOMDIX_EN configuration strap. PHY Register 27.14 and
Auto-MDIX Enable
Only effective when 27.15=1, otherwise ignored.
0 = Disable Auto-MDIX. 27.13 determines normal or reversed connection.
1 = Enable Auto-MDIX. 27.13 must be set to 0.
Auto-MDIX State
Only effective when 27.15=1, otherwise ignored.
When 27.14 = 0 (manually set MDIX state):
When 27.14 = 1 (automatic MDIX) this bit must be set to 0.
Do not use the combination 27.15=1, 27.14=1, 27.13=1.
RESERVED
VCOOFF_LP
Forces the Receive PLL 10M to lock on the reference clock at all times: 0
– Receive PLL 10M can lock on reference or line as needed (normal
operation) 1 - Receive PLL 10M is locked on the reference clock. In this
mode 10M data packets cannot be received.
RESERVED
XPOL
Polarity state of the 10BASE-T:
0 – Normal polarity
1 – Reversed polarity
RESERVED
Special Control/Status Indications
27.13 determine MDIX function.
0 = no crossover (TPO = output, TPI = input)
1 = crossover (TPO = input, TPI = output)
Index (In Decimal):
DESCRIPTION
27
Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
DATASHEET
146
Size:
16 bits
NASR
TYPE
R/W,
SMSC LAN9420/LAN9420i
R/W
R/W
R/W
RO
RO
RO
RO
DEFAULT
Datasheet
0b
0b
0b
0b
0b
-
-
-