UM0843 datasheet(13/48 Pages) STMICROELECTRONICS

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UM0843

Block descriptions

Doc ID16543 Rev 2

13/48

By default the external configuration of the SMII-3 Ethernet PHYs is selected as shown in

Table 6.

Table 5.

SMII-2 PHY jumpers

Jumper

Description

Default configuration

JP23, JP24, JP25

SMII PHY U19 mode configuration:

Default: JP23-open, JP24-fitted, JP25-open:

Set U19 to work as SMII function

JP20, JP21, JP22

SMII PHY U19 addresses configuration:

Default: JP20-open, JP21-open, JP22-open:

Set SMII-2 PHY address: 0x03

JP26

ISOLATE mode:

Pull-up = Enable

Pull-down (default) = Disable

JP27

Nway auto-negotiation enable:

Pull-up (default) = Enable auto-negotiation

Pull-down = Disable auto-negotiation

JP28

Speed mode:

Pull-up (default) = 100 Mbps

Pull-down = 10 Mbps

JP29

Duplex mode:

Pull-up (default) = Half duplex

Pull-down = Full duplex

Table 6.

SMII-3 PHY jumper

Jumper

Description

Default configuration

JP33, JP34, JP35

SMII PHY U20 mode configuration:

Default: JP33-open, JP34-fitted,JP35-open:

Set U20 to work as SMII function

JP30, JP31, JP32

SMII PHY U20 addresses configuration:

Default: JP30-open, JP31-open, JP32-open:

Set SMII-3 PHY address: 0x05

JP36

ISOLATE mode:

Pull-up = Enable

Pull-down (default) = Disable

JP23

JP24

JP25

JP20

JP21

JP22

JP26

JP27

JP28

JP29

JP33

JP34

JP35

JP30

JP31

JP32

JP36

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