UM0843 datasheet(14/48 Pages) STMICROELECTRONICS

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UM0843

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Doc ID16543 Rev 2

By default the external configuration of the SMII-4 Ethernet PHYs is selected as shown in

Table 7.

By default the initial configuration of the MII Ethernet PHYs is selected as shown in Table 8..

JP37

Nway auto-negotiation enable:

Pull-up (default) = Enable auto-negotiation

Pull-down = Disable auto-negotiation

JP38

Speed mode:

Pull-up (default) = 100 Mbps

Pull-down = 10 Mbps

JP39

Duplex mode:

Pull-up (default) = Half duplex

Pull-down = Full duplex

Table 7.

SMII-4 PHY jumper default settings

Jumper

Description

Default configuration

JP43, JP44, JP45

SMII PHY U21 mode configuration:

Default: JP43-open, JP44-fitted, JP45-open:

Set U21 to work as SMII function

JP40, JP41, JP42

SMII PHY U21 address configurations:

Default: JP40-open, JP41-open, JP42-open:

Set SMII-4 PHY address: 0x07

JP46

Isolate mode:

Pull-up = Enable

Pull-down (default) = Disable

JP47

Nway auto-negotiation enable:

Pull-up (default) = Enable auto-negotiation

Pull-down = Disable auto-negotiation

JP48

Speed mode:

Pull-up (default) = 100 Mbps

Pull-down = 10 Mbps

JP49

Duplex mode:

Pull-up (default) = Half duplex

Pull-down = Full duplex

Table 6.

SMII-3 PHY jumper (continued)

Jumper

Description

Default configuration

JP37

JP38

JP39

JP43

JP44

JP45

JP40

JP41

JP42

JP46

JP47

JP48

JP49

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