參數(shù)資料
型號: LXT970A
廠商: Intel Corp.
英文描述: Dual-Speed Fast Ethernet Transceiver
中文描述: 雙速度快速以太網(wǎng)收發(fā)器
文件頁數(shù): 31/74頁
文件大?。?/td> 1061K
代理商: LXT970A
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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