W5100S datasheet(88/110 Pages) WIZNET

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W5100S Datasheet Version1.2.5

/* PHYCR0 & PHYCR1 Lock */

PHYLCKR = 0x00;

// for Lock, write any value

}

4.9.3 Ethernet PHY Parallel Detection

When Link Partner does not support Auto-negotiation, Internal Ethernet PHY forms Link through

Parallel Detection.

If Duplex mode is different (such as 10F/10H), it occurs of Network performance degradation.

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

4.9.4 Ethernet PHY Auto MDIX

Ethernet PHY supports Auto-negotiation and it is set by PHYCR0 [AUTO]. If Auto-negotiation is

set (PHYCR0 [AUTO] = ‘0’), Auto-MDIX is supported and Symmetric Transformer (Figure 30

Transformer Type) is operated.

If Auto-negotiation is not set (PHYCR0 [AUTO] = ‘1’), Cross UTP cable must be needed because

Auto-MDIX is not supported.

Ref) if either of Linked Nodes supports Auto-MDIX, Both straight and Cross UTP Cable are usable.

4.9.5 Ethernet PHY Power Down Mode

When PHYCR1 [PWDN] is set ‘1’, Ethernet PHY becomes Power Down Mode and SYS_CLK is set

25MHz.

On the other hand, if PHYCR1 [PWDN] is set ‘0’, Ethernet PHY becomes Normal Mode and

SYS_CLK is set by MR2 [CLKSEL]. (Ref 3.1.19 MR2 (Mode Register 2))

Enter Power Down Mode :

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