Marvell 88E3015 Manual page 60

88E3015/88E3018
Integrated 10/100 Fast Ethernet Transceiver
Table 32: PHY Control Register (Continued)
Register 0
B i ts F i el d
11 PwrDwn
10 Isolate
9 RestartAneg
8 Duplex
7 ColTest
6 SpeedMSB
5 Unidirectional
Enable
4:0 Reserved
Doc. No. MV-S103657-00, Rev. D
Page 60
M o d e H W S W
R s t R s t
R/W 0x0 Retain
R/W 0x0 Retain
R/W, 0x0 Self
SC Clear
R/W 0x1 Update
R/W 0x0 Retain
RO Always Always
0 0
R/W 0x0 Retain
RO Always Always
0 0
Document Classification: Proprietary Information
D e s c r i p t io n
Power Down Mode
When the port is switched from power down to normal
operation, software reset and restart Auto-Negotiation
are performed even when bits Reset (bit 15, above) and
Restart Auto-Negotiation (bit 9, below) are not set by the
user.
0 = Normal operation
1 = Power down
Isolate Mode
0 = Normal operation
1 = Isolate
Restart Auto-Negotiation
Auto-Negotiation automatically restarts after hardware
or software reset regardless of whether or not the restart
bit is set.
0 = Normal operation
1 = Restart Auto-Negotiation Process
Duplex Mode Selection
A write to this registers has no effect unless any one of
the following also occurs:
Software reset is asserted (bit 15), Power down (bit 11),
or transitions from power down to normal operation.
0 = Half-duplex
1 = Full-duplex
Collision Test Mode - This applies to E3010 only.
0 = Disable COL signal test
1 = Enable COL signal test
Speed Selection Mode (MSB)
Will always be 0.
0 = 100 Mbps or 10 Mbps
0 = Enable transmit direction only when valid link is
established.
1 = Enable transmit direction regardless of valid link if
register 0.12 = 0 and 0.8 = 1. Otherwise enable
transmit direction only when valid link is established.
Will always be 0.
Copyright © 2008 Marvell
January 4, 2008, Advance