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LXT970ATC датащи(PDF) 31 Page - Intel Corporation

номер детали LXT970ATC
подробное описание детали  Dual-Speed Fast Ethernet Transceiver
PDF  74 Pages
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производитель  INTEL [Intel Corporation]
домашняя страница  http://www.intel.com
Logo INTEL - Intel Corporation

LXT970ATC датащи(HTML) 31 Page - Intel Corporation

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Dual-Speed Fast Ethernet Transceiver — LXT970A
Datasheet
31
Controlling Auto-Negotiation
When auto-negotiation is controlled by software, the following steps are recommended:
• After a reset or power-up (initial or from power down mode), the power down recovery time
(refer to Table 43 on page 62) must be exhausted before proceeding.
• Set MDIO Register 4 advertisement capabilities before setting MDIO bit 0.12 = 1 to enable
auto-negotiation.
2.5
Monitoring Operational Status
2.5.1
Monitoring Status via MII Registers
The Chip Status Register (Table 56 on page 72) provides a convenient indication of several status
conditions:
• Bit 20.13 is set to 1 once the link is established.
• Bits 20.11 and 20.12 indicate the link speed and duplex condition respectively.
• Bits 20.9 and 20.8 indicate the progress and status of auto-negotiation.
Refer to the Register Definition section on page 63 for additional details on specific registers.
Figure 12. Auto-Negotiation Operation
Auto
Negotiation
Start
Done
Enable
Auto-Neg/Parallel Detection
Go To Forced
Settings
Attempt Auto-
Negotiation
Listen for 10T
Link Pulses
Listen for 100TX
Idle Symbols
Link Set?
NO
YES
Power-Up, Reset,
Link Failure
Disable
Auto-Negotiation



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