VSC8601 Datasheet
Configuration
Table 45.
Extended PHY Control 5, Address 27E (0x1B) (continued)
Bit
Name
Access Description
This is a sticky bit.
Default
8:6
100BASE-TX
R/W
R/W
R/W
110
transmitter
amplitude control
011 = Reserved.
010 = +4 amplitude setting (largest).
001 = +3 amplitude setting.
000 = +2 amplitude setting.
111 = +1 amplitude setting.
110 = Default amplitude.
101 = –1 amplitude setting.
100 = –2 amplitude setting (smallest).
5:3
1000BASE-T
transmitter
amplitude control
This is a sticky bit.
011 = Reserved.
000
010 = +2 amplitude setting (largest).
001 = +1 amplitude setting.
000 = Default amplitude.
111 = –1 amplitude setting.
110 = –2 amplitude setting.
101 = –3 amplitude setting.
100 = –4 amplitude setting (smallest)
2:0
1000BASE-T edge
rate control
This is a sticky bit.
011 = +4 edge rate (slowest).
010 = +3 edge rate.
111
001 = +2 edge rate.
000 = +1 edge rate.
111 = default edge rate.
110 = –1 edge rate.
101 = –2 edge rate.
100 = –3 edge rate (fastest)
4.3.12
RGMII Skew Control
The following table lists the settings available.
Table 46.
RGMII Skew Control, Address 28E (0x1C)
Bit
Name
Access Description
Default
15:14 RGMII TX skew
compensation
enable
R/W
R/W
R/W
R/W
This is a sticky bit.
00 = 0 ns.
01 = 1.4 ns.
10 = 1.7 ns.
11 = 2.0 ns.
CMODE
13:12 RGMII RX skew
compensation
enable
This is a sticky bit.
00 = 0 ns.
01 = 1.4 ns.
10 = 1.7 ns.
11 = 2.0 ns.
CMODE
11:10 Jumbo packet mode
This is a sticky bit.
00
0
00 = Normal IEEE 1.5 kB packet length.
01 = Normal IEEE 9 kB packet length.
10 = Normal IEEE 12 kB packet length.
11 = Normal IEEE 16 kB packet length.
9
10BASE-T no
This is a sticky bit.
preamble mode
1 = Enabled, no preamble required.
0 = Disabled, preamble required.
Revision 4.1
September 2009
Page 62
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
