UM0843 datasheet(12/48 Pages) STMICROELECTRONICS

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Block descriptions

UM0843

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Doc ID16543 Rev 2

By default the external configuration of the SMII-1 Ethernet PHYs is selected as shown in

Table 4.

By default the external configuration of the SMII-2 Ethernet PHYs is selected as shown in

Table 5.

Table 3.

SMII addresses of the SMII Ethernet PHYs

Component

MII address

U18

0x01

U19

0x03

U20

0x05

U21

0x07

Table 4.

SMII-1 PHY jumpers

Jumper

Description

Default configuration

JP13, JP14, JP15

SMII PHY U18 mode configuration:

Default: JP13-open, JP14-fitted, JP15-open:

Set U18 to work as SMII function

JP10, JP11, JP12

SMII PHY U18 address configurations:

Default: JP10-open, JP11-open, JP12-open:

Set SMII-1 PHY address: 0x01

JP16

Isolate mode:

Pull-up = Enable

Pull-down (default) = Disable

JP17

Nway auto-negotiation enable:

Pull-up (default) = Enable auto-negotiation

Pull-down = Disable auto-negotiation

JP18

Speed mode:

Pull-up (default) = 100 Mbps

Pull-down = 10 Mbps

JP19

Duplex mode:

Pull-up (default) = Half duplex

Pull-down = Full duplex

JP10

JP11

JP12

JP10

JP11

JP12

JP16

JP17

JP18

JP19

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