LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
94
Datasheet
8
100BASE-TX FD
1 = DTE is 100BASE-TX full-duplex capable.
0 = DTE is not 100BASE-TX full-duplex capable.
R
0
7
100BASE-TX
1 = DTE is 100BASE-TX capable.
0 = DTE is not 100BASE-TX capable.
R
2
1
6
10BASE-T FD
1 = DTE is 10BASE-T full-duplex capable.
0 = DTE is not 10BASE-T full-duplex capable.
R
0
5
10BASE-T
1 = DTE is 10BASE-T capable.
0 = DTE is not 10BASE-T capable.
R
2
1
4:0
Selector Field,
<00001> = IEEE 802.3.
<00010> = IEEE 802.9 ISLAN-16T.
<00000> = Reserved for future auto-negotiation development.
<11111> = Reserved for future auto-negotiation development.
Unspecified or reserved combinations should not be transmitted.
R
00001
Table 82. Auto-Negotiation Configuration Register
Bit
Name
Description
Type
1
Default
7
Restart Negotiate
(Port 4)
Writing a
‘
1
’
causes the port to renegotiate if its Auto-Negotiate Enable
bit is set to
‘
1
’
. Writing a
‘
1
’
to this bit overrides the port external
configuration settings.
These bits are self-clearing.
W
0
6
Restart Negotiate
(Port 3)
W
0
5
Restart Negotiate
(Port 2)
W
0
4
Restart Negotiate
(Port 1)
W
0
3
Auto-Negotiate
Enable (Port 4)
1 = Port auto negotiate is enabled.
0 = Port auto negotiate is not enabled.
Enabling auto-negotiation via software requires writing to both the Port
Speed Control Register and the Auto-Negotiate Configuration Register
(see
Table 61 on page 85
).
If Auto negotiate is not enabled, the port will take on the speed forced
values set in the port speed control register. If auto negotiate is enabled,
all abilities will be advertised. Forcing a port speed via the port speed
control register (refer to
Table 61 on page 85
) will always override and
disable auto-negotiation.
R/W
1
2
Auto-Negotiate
Enable (Port 3)
R/W
1
1
Auto-Negotiate
Enable (Port 2)
R/W
1
0
Auto-Negotiate
Enable (Port 1)
R/W
1
1. W = Write; R/W = Read/Write.
Table 81. Auto-Negotiation Advertisement Register (Continued)
Bit
Name
Description
Type
1
Default
1. R = Read only; R/W = Read/Write.
2. These settings are determined by the port speed control register and the auto negotiate configuration register.