IP1001-DS-R05 datasheet(22/48 Pages) ETC2

22 / 48 page

IP1001 LF

Data Sheet

22/48

Dec. 18, 2007

IP1001-DS-R06

3.5

Auto MDI/MDIX Crossover

The IP1001 implements auto-crossover function, that is, users don’t have to care using a crossover or

non-crossover cable. Its pin mapping in MDI and MDIX modes is shown in the following table. If IP1001

interoperates with a device that does not implement auto MDI/MDIX crossover, the IP1001 makes the

necessary adjustment prior to performing auto-negotiation. If the IP1001 interoperates with a device that

implements auto MDI/MDIX crossover, a random algorithm as described in IEEE 802.3 section 40.4.4

determines which device performs the crossover.

When the IP1001 interoperates with a 10BASE_T PHY or a PHY that implements auto-negotiation, IP1001

decides the MDI/MDIX by the presence of link pulses. However, when interoperating with a 100BASE_TX

PHY that does not implement auto-negotiation (i.e. link pulses are not present), IP1001 uses signal energy of

receiving MLT3 signals to determine whether or not to crossover.

The auto MDI/MDIX function is turned on automatically after hardware reset and users can disable it by

programming MII register 20.2. User can check if IP1001 is in MDI or MDIX type by reading MII register 17.11.

Auto MDI/MDIX function is not affected by disabling auto-negotiation function.

MDI

MDIX

1000BASE-T 100BASE-TX 10BASE-T

MDI[0]P/M

BI_DA+/-

TX+/-

BI_DB+/-

RX+/-

MDI[1]P/M

BI_DB+/-

RX+/-

BI_DA+/-

TX+/-

MDI[2]P/M

BI_DC+/-

Unused

BI_DD+/-

Unused

MDI[3]P/M

BI_DD+/-

Unused

BI_DC+/-

Unused

3.6

Polarity Correction

The IP1001 performs polarity correction without any manual setting. It corrects polarity errors on the receive

pairs in 1000BASE-T and 10BASE-T modes automatically.

In 1000BASE-T mode, polarity correction is based on the sequence of idle symbols. In 10BASE-T mode,

polarity correction is based on the detection the polarity of valid normal link pulse and idle pulse. In

100BASE-TX mode, the polarity does not matter.

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