ASIX ELECTRONICS CORPORATION

13

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

3.5 LED Display Interface

AX88873 provides per-port LED status indication for partition, jabber, activity and support rate - based LED

for 10 and 100Mbps segments utilization (%) . All LED[1:0] perform active low.

LED[1:0] Status Driver Wave-form as follows :

JAB7

JAB6

JAB5

JAB4

JAB3

JAB2

JAB1

JAB0

LED_CK

LED[0]

LED[0]

Continue

LED[1]

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D11

D12

D13

D14

D10

D15

ACT0

ACT1

ACT2

ACT3

ACT4

ACT5

ACT6

ACT7

10M

UTI0

10M

UTI1

10M

UTI2

10M

UTI3

10M

UTI4

10M

UTI5

100M

UTI0

100M

UTI2

100M

UTI3

100M

UTI4

100M

UTI5

100M

UTI1

LED[1]

Continue

PART

7

PART

6

PART

0

PART

1

PART

2

PART

3

PART

4

PART

5

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

RID0

RID1

RID2

RID3

D16

D19

D20

D21

D22

D18

D23

D17

( This portation no clock presented )

Chip 0 Memory Test Fail and/or 100M Collision

Chip 1 Memory Test Fail and/or 10M Collision

Notes:

a.

PART7~0indicates partition status for each port

b.

JAB7~0 indicates jabber status for each port

c.

ACT7~0 indicates activity status for each port

d.

RID3~0 is the ID of repeater chip

e.

10M UTI5~0 indicate global utilization rate of 10Mbps for each 104.8ms sampling period.

f.

100M UTI5~0 indicate global utilization rate of 100Mbps for each 104.8ms sampling period.

It must use external shift register to decode data on LED[1:0]. The application shows as follows:

74LS164(#1)

Q

0

Q

1

Q

2

Q

3

Q

4

Q

5

Q

6

Q

7

D

LED[0]

LED_CK

74LS164(#3)

Q

0

Q

1

Q

2

Q

3

Q

4

Q

5

Q

6

Q

7

D

74LS164(#2)

Q

0

Q

1

Q

2

Q

3

Q

4

Q

5

Q

6

Q

7

D

Fig - 3

Application for LED display

If the user don‘t want to show jabber status, take away the latter 74LS164(#2). The application is the

same for LED[1].