UM0805

Block descriptions

Doc ID 16304 Rev 3

11/29

Speed select strap

These strap option pins have 2 different functions depending on whether Auto-Negotiation is

enabled or not. Refer to Table 2.

Table 2.

Default settings for other jumpers

Reference designator

Description

On

Off

JP8

JP13

PHY Address bit 0

1

23

1

2

3

JP9

JP14

Auto-negotiation enable bit

1

2

3

1

23

JP10

JP15

Full Duplex select bit

1

23

1

2

3

JP11

JP16

Speed 1 select bit (See Table 3 and Table 4)

1

2

3

1

23

JP12

JP17

Speed 0 select bit (See Table 3 and Table 4)

1

23

1

2

3

Table 3.

Auto-negotiation disabled

Speed[1]

Speed[0]

Speed enabled

11

Reserved

1

0

1000BASE-T

0

1

100BASE-T

0

0

10BASE-T

Table 4.

Auto-negotiation enabled (advertised capability)

Speed[1]

Speed[0]

Speed enabled

1

1

1000BASE-T, 10BASE-t

1

0

1000BASE-T

0

1

1000BASE-T, 100BASE-T

0

0

1000BASE-T, 100BASE-T, 10BASE-T