Marvell 88E3015 Manual page 71

Table 42: PHY Specific Control Register (Continued)
Register 16
B i ts F i e l d
7 ExtdDistance
6 SIGDET Polar-
ity
5:4 AutoMDI[X]
3 Reserved
2 SQE Test
1 AutoPol
0 DisJabber
Copyright © 2008 Marvell
January 4, 2008, Advance
M o d e H W S W
R s t R s t
R/W 0x0 0x0
R/W 0x0 Update
R/W See Update
Desc.
R/W 0x0 Retain
R/W 0x0 Retain
R/W 0x0 0x0
R/W 0x0 0x0
Document Classification: Proprietary Information
D e s c r i p t io n
Enable Extended Distance
When using cable exceeding 100 meters, the 10BASE-
T receive threshold must be lowered in order to detect
incoming signals.
0 = Normal 10BASE-T receive threshold
1 = Lower 10BASE-T receive threshold
0 = SIGDET Active High
1 = SIGDET Active Low
MDI/MDIX Crossover
During Hardware Reset register 16.5:4 defaults as fol-
lows
ENA_XC 16.5:4
0 00
1 11
This setting can be changed by writing to these bits fol-
lowed by software reset.
00 = Transmit on pins MDIP/N[0], Receive on pins
MDIP/N[1]
01 = Transmit on pins MDIP/N[1], Receive on pins
MDIP/N[0]
1x = Enable Automatic Crossover
SQE Test is automatically disabled in full duplex mode
0 = Disable SQE Test
1 = Enable SQE Test
Polarity Reversal
If Automatic polarity is disabled, then the polarity is
forced to be normal in 10BASE-T mode. Polarity rever-
sal has no effect in 100BASE-TX mode. This bit only
controls polarity correction at the inputs. The output
polarity is not programmable.
0 = Enable automatic polarity reversal
1 = Disable automatic polarity reversal
Disable Jabber
Jabber has no effect in full-duplex or in 100BASE-X
mode.
0 = Enable jabber function
1 = Disable jabber function
Doc. No. MV-S103657-00, Rev. D
Register Description
Page 71