lxt9785 Intel Corporation, lxt9785 Datasheet - Page 206

• Manufacturer Part Number: lxt9785
• Description: Advanced 8-port 10/100 Mbps Phy Transceivers
• Manufacturer: Intel Corporation

LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
208
Table 92. Port Configuration Register (Address 16, Hex 10) (Sheet 2 of 2)
1. R/W = Read/Write
2. LSHR = Default value is derived from a single device input pin state or a group of device input pin states as
3. The default value of Register bit 16.0 is determined by the G_FX/TP pin.
4. The default value of Register bit 16.5 is determined by the PREASEL pin. The BGA15 package does not
5. The BGA15 package does not support fiber. Default for the BGA15 package is 0.
6. NA means the bits do not have a default value and may initially contain any value.
Bit
9
8
7
6
5
4
3
2
1
0
the pin(s) are latched at startup or hardware reset.
If G_FX/TP is tied Low, the default value of Register bit 16.0 = 0. If G_FX/TP is not tied Low, the default
value of Register bit 16.0 = 1. The BGA15 package does not have a G_FX/TP hardware configuration pin.
have a PREASEL hardware configuration pin and has a default of 0.
Name
Reserved
TP Loopback
(10BASE-T)
Reserved
Reserved
Preamble Enable
Reserved
Reserved
Far End Fault
Transmission
Enable
Invalid for
BGA15
Reserved
Fiber Select
Reserved for
BGA15
5
Description
Write as 0, ignore on Read.
0 = Normal operation
1 = Disable twisted-pair loopback during half-duplex
Note: Valid function in SMII and S-SMII modes only.
Write as 1, ignore on Read
Write as 0, ignore on Read
10 Mbps
100
Mbps
Write as 0, ignore on Read
Write as 0, ignore on Read
0 = Disable Far End Fault transmission
1 = Enable Far End Fault transmission
Write as '0', ignore on Read (BGA15).
Write as 0, ignore on Read.
0 = Select twisted-pair mode for this port
1 = Select fiber mode for this port
Write as '0', ignore on Read (BGA15).
NOTE: Default for BGA15 is 0.
operation
0 = No preamble (default)
1 = Preamble enabled
NOTE: Default for BGA15 package is 0.
No effect
Revision Date: August 28, 2003
Document Number: 249241
Revision Number: 007
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
Datasheet
LSHR
Default
LSHR
N/A
0
1
1
0
0
1
0
0
2,4
2,3