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LXT975B Datasheet(PDF) 26 Page - Intel Corporation

Part # LXT975B
Description  Fast Ethernet 10/100 Quad Transceivers
PDF  74 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

LXT975B Datasheet(HTML) 26 Page - Intel Corporation

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LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
26
Datasheet
Individual chip addressing allows multiple LXT974/975 devices to share the MII in either mode.
Table 15 through Table 17 show how to set up the desired operating configurations using the
Hardware Control Interface.
Table 15. Configuring the LXT974/975 via Hardware Control
Desired Configuration
Pin Name
Input Value
MDIO Registers
Auto-Negotiation Enabled on all ports1, 2, 3
AUTOENA
High
0.12 = 1
SD/TPn
Low
19.2 = 0
Auto-Negotiation Disabled on all ports4
AUTOENA
Low
0.12 = 0
Scrambler Bypassed on all ports
BYPSCR
High
19.3 = 1
Scrambler Enabled on all ports
BYPSCR
Low
19.3 = 0
1. SD/TPn must be set Low for Auto-Negotiation operation.
2. Refer to Table 16 for Hardware Control Interface functions advertised when auto-negotiation is enabled.
3. Fiber operation can be forced per port via SD/TPn pins when auto-negotiation is enabled. See Table 17 for details.
4. Refer to Table 17 for Hardware Control Interface functions available when auto-negotiation is disabled.
Table 16. Configuring LXT974/975 Auto-Negotiation Advertisements Via
Hardware Control
Desired
Configuration1,2
Pin Settings
MDIO Registers
SD/TPn
(per port)
FDE
(global)
CFG_2
(global)
CFG_1
(global)
CFG_03
(global)
4.5
4.6
4.7
4.8
Advertise All
Low
Ignore
Low
Low
Ignore
1
1
1
1
Advertise 100 HD
Low
Low
High
Low
Ignore
0
0
1
0
Advertise 100 HD/FD
Low
High
High
Low
Ignore
0
0
1
1
Advertise 10 HD
Low
Low
Low
High
Ignore
1
0
0
0
Advertise 10 HD/FD
Low
High
Low
High
Ignore
1
1
0
0
Advertise 10/100 HD
Low
Low
High
High
Ignore
1
0
1
0
1. Refer to Table 15 for basic configurations.
2. Refer to Table 17 for Hardware Control Interface functions available when auto-negotiation is disabled.
3. Auto-Negotiation is not affected by CFG_0.



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