LAN8810I-AKZE Datasheet, PDF (21/100 Pages) Microchip Technology – GMII 10/100/1000 Ethernet Transceiver with HP Auto-MDIX Support

GMII 10/100/1000 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Control Register. If both the link partner and the local device are manually given the same
Master/Slave assignment, an error will be indicated in the Master/Slave Configuration Fault bit of the
Master/Slave Status Register.
Depending on the link partner configuration, the manual Master/Slave mode can be resolved to sixteen
possible outcomes, as shown in Table 3.1.
Table 3.1 Master/Slave Resolution for 1000BASE-T
LAN8810/LAN8810I
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LAN8810/LAN8810I RESULT
Single-Port
Single-Port
Single-Port
Single-Port
Multi-Port
Multi-Port
Multi-Port
Multi-Port
Manual Master
Manual Master
Manual Master
Manual Master
Manual Slave
Manual Slave
Manual Slave
Manual Slave
Single-Port
Multi-Port
Manual Master
Manual Slave
Single-Port
Multi-Port
Manual Master
Manual Slave
Single-Port
Multi-Port
Manual Master
Manual Slave
Single-Port
Multi-Port
Manual Master
Manual Slave
M/S resolved by random seed
Slave
Slave
Master
Master
M/S resolved by random seed
Slave
Master
Master
Master
No Link
Master
Slave
Slave
Slave
No Link
LINK PARTNER RESULT
M/S resolved by random seed
Master
Master
Slave
Slave
M/S resolved by random seed
Master
Slave
Slave
Slave
No Link
Slave
Master
Master
Master
No Link
3.1.5
3.1.6
Manual Operation
The device supports a manual (forced) operation for test purposes. In manual operation, the user sets
the link speed (10Mbps or 100Mbps) and the duplex state (full or half).
Auto-negotiation must be disabled in order to manually configure the speed and the duplex. This may
be accomplished using the configuration pins, as described in Section 3.8.1.2.2, "Configuring the Mode
of Operation (CONFIG[3:2])," on page 31, or by using the Basic Control Register register as described
in Section 3.1.2, "Disabling Auto-negotiation," on page 20. For 10BASE-T and 100BASE-TX, the link
state of the device is determined by the Speed Select[1], Speed Select[0], and Duplex Mode bits of
the Basic Control Register. Manual operation at a link speed of 1000Mbps is not supported.
Half vs. Full-Duplex
Half-duplex operation relies on the CSMA/CD (Carrier Sense Multiple Access / Collision Detect)
protocol to handle network traffic and collisions. In this mode, the internal carrier sense signal, CRS,
responds to both transmit and receive activity. If data is received while the PHY is transmitting, a
collision results.
SMSC LAN8810/LAN8810i
21
DATASHEET
Revision 1.0 (02-06-13)