W6100 datasheet(133/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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/* wait until PHY Link is up */

while(PHYSR[LNK] != ‘0’);

/* read PHYSR */

If( (PHYSR[5:3] == phy_mode) ) SUCCESS;

else FAIL;

}

6.8.3 Ethernet PHY Parallel Detection

If the link partner doesn’t support auto-negotiation, embedded Ethernet PHY of W6100 makes

a link via parallel detection.

*CAUTION T

he duplex mode mismatch like 10F/10H may decrease the network performance.

Link Partner

PHY

Auto

10H

10F

100H

100F

Auto

100F

10H

10F

10H

100H

100F

100H

Manual

10H

10F

10H

Manual

10F

10H

10F

10H

10F

Manual

100H

100F

Manual

100F

100H

100F

100H

100F

6.8.4 Ethernet PHY Auto MDIX

W6100 supports auto-MDIX when Ethernet PHY is set as auto-negotiation (PHYCR0[MODE2] =

‘0’), symmetric transformer (Figure 43 Transformer Type) is used in this case.

Without auto-negotiation, auto-MDIX cannot be supported, hence cross UTP cable should be

used.

*CAUTION : If any mode among all nodes make link support auto-MDIX, then both straight or cross

UTP cable can be used.

6.8.5 Ethernet PHY Power Down Mode

In case of PHYCR1[PWDN] = ‘1’, Ethernet PHY enters power down mode and SYS_CLK is changed

to 25MHz.

W6100 Datasheet(PDF) 133 Page - WIZnet Co., Ltd

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