LAN9500 Datasheet, PDF (77/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
The Auto-MDIX function can be disabled through the Special Control/Status Indications Register, or the external
AUTOMDIX_EN configuration strap.
Note:
When operating in 10BASE-T or 100BASE-TX manual modes, the Auto-MDIX crossover time can be
extended via the Extend Manual 10/100 Auto-MDIX Crossover Time bit of the EDPD NLP / Crossover Time
Configuration Register. Refer to Section 7.5.8, "EDPD NLP / Crossover Time Configuration Register," on
page 182 for additional information.
FIGURE 5-19:
DIRECT CABLE CONNECTION VS. CROSS-OVER CABLE CONNECTION.
RJ-45 8-pin straight-through
for 10BASE-T/100BASE-TX
signaling
TXP 1
TXN 2
RXP 3
Not Used 4
Not Used 5
RXN 6
Not Used 7
Not Used 8
1 TXP
2 TXN
3 RXP
4 Not Used
5 Not Used
6 RXN
7 Not Used
8 Not Used
Direct Connect Cable
RJ-45 8-pin cross-over for
10BASE-T/100BASE-TX
signaling
TXP 1
TXN 2
RXP 3
Not Used 4
Not Used 5
RXN 6
Not Used 7
Not Used 8
1 TXP
2 TXN
3 RXP
4 Not Used
5 Not Used
6 RXN
7 Not Used
8 Not Used
Cross-Over Cable
5.6.8 PHY POWER-DOWN MODES
There are 2 power-down modes for the PHY as discussed in the following sections.
5.6.8.1 General Power-Down
This power-down is controlled by register 0, bit 11. In this mode the PHY, except the management interface, is powered-
down and stays in that condition as long as PHY register bit 0.11 is HIGH. When bit 0.11 is cleared, the PHY powers up
and is automatically reset. Please refer to Section 7.5.1, "Basic Control Register," on page 175 for additional information
on this register.
Note: For maximum power savings, auto-negotiation should be disabled before enabling the General Power-
Down mode.
 2010 - 2015 Microchip Technology Inc.
DS00001875A-page 77