AX88875AP Bripeater

ASIX ELECTRONICS CORPORATION

14

3.3 Jabber State Machine

To prevent an illegally long reception of data from reaching the repeater unit, each port has its own jabber

timer. If a reception exceeds this duration (64K bit times for AX88875A), the jabber condition will be detected.

In this condition, repeater unit will disable receive and transmit packets for the jabbered port and the other ports

remain the normal operation.

When the carrier is no longer detected for the jabbered port or reset the repeater, the jabber function will be

clear and re-enable reception and transmission.

3.4 Partition State Machine

The partition state machine is used to protect network from being upset when a port suffer continuous

collision, each port uses a partition state machine to detect and prevent this condition. When a port suffer from

continuous 64 times of collision events, then it goes to partition state. The partitioned port will be not released

until a packet without collision be transmitted( more than 512 bit times for AX88875A) or reset the repeater.

3.5 LED Display Interface

AX88875A provides per-port LED status indication for partition, jabber, activity and support rate -

based LED for global partition and collision, utilization (%) for 10/100Mbps. .Detail function is described on

the previous pin description(LED interface). LED[2:0] are all active low. There are two display ways :

complicated and simple way. It depends on the setting of MODE.

Rich LED display application (MODE = 1)

LED[2:0] Status Driver Wave-form as follows :

JAB4

JAB3

JAB2

JAB1

JAB0

PART

4

LED_CK

LED[0]

'0'

100M

GCOL

10M

GCOL

LED[1]

LED[2]

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D11

D12

D13

D14

D10

D15

PART

0

PART

1

PART

2

PART

3

ACT 0

ACT 1

ACT 2

ACT 3

ACT 4

10M

UTI7

10M

UTI0

10M

UTI1

10M

UTI2

10M

UTI3

10M

UTI4

10M

UTI5

10M

UTI6

100M

UTI7

100M

UTI0

100M

UTI2

100M

UTI3

100M

UTI4

100M

UTI5

100M

UTI6

100M

UTI1

G

PART

RAM

FAIL