HBLXT9761HC.C4 Intel, HBLXT9761HC.C4 Datasheet - Page 30

• Manufacturer Part Number: HBLXT9761HC.C4
• Manufacturer: Intel

Specifications of HBLXT9761HC.C4

• Lead Free Status / RoHS Status: Not Compliant

LXT9761/9781 — Fast Ethernet 10/100 Multi-Port Transceiver with RMII
2.5.2
2.6
30
Figure 12. Auto-Negotiation Operation
Note: Do not enable Auto-Negotiation if fiber mode is selected.
Auto-Negotiation
Go To Forced
Disable
Settings
Parallel Detection
In parallel with auto-negotiation, the LXT97x1 also monitors for 10 Mbps Normal Link Pulses
(NLP) or 100 Mbps Idle symbols. If either is detected, the device automatically reverts to the
corresponding operating mode. Parallel detection allows the LXT97x1 to communicate with
devices that do not support auto-negotiation.
RMII Operation
The LXT97x1 provides an independent Reduced MII port for each network port. Each RMII uses
four signals to pass received data to the MAC: RXDn<1:0>, RXERn, and CRS_DVn (where n
reflects the port number). Three signals are used to transmit data from the MAC: TXDn_<1:0>,
and TXENn. Both Receive and transmit signals are clocked by REFCLK. Data transmission
across the RMII is implemented in di-bit pairs which equal a 4-bit-wide nibble.
Done
•
•
•
After power-up, power-down, or reset, the power-down recovery time, (see
page
Set the auto-negotiation advertisement bits.
Enable auto-negotiation (set MDIO bit 0.12 = 1).
61), must be exhausted before proceeding.
0.12 = 0
Power-Up, Reset,
Link Failure
Check Value
Attempt Auto-
Start
0.12
Negotiation
0.12 = 1
YES
Listen for 100TX
Auto-Neg/Parallel Detection
Idle Symbols
Link Set
Enable
NO
Listen for 10T
Link Pulses
Table 31 on
Datasheet