DM9081

Final

5

Version: DM9081-DS-F01

April 22, 1997

Pin Description

Pin No.

Pin Name

I/O

Description

Miscellaneous

3, 4, 9, 30,

40, 50, 83,

93

P

Digital Power

14, 21, 35,

45, 88, 98

DGND

P

Digital Ground

18

RESET#

I

Active low to reset the internal logic of DM9081. It should be synchronized to

X2 if multiple DM9081s

are used

20, 19

TESTPIN0

TESTPIN1

I

These two pins are used to select LED display mode. Normal mode is selected

connected to GND. Other settings are prohibited

26, 29

NC

-

These pins should be left open

27

X2

I

A 20MHz oscillator or crystal should be attached to this pin

28

X1

O

This pin is used in crystal connection only. It is left open when using an

oscillator

67, 81

P

Analog Power

68, 82

AGND

P

Analog Ground

LED Display Pins

5LED_LATCH

(LI/RX7)

O

This pin is used to latch the serial LED information from pins 6 to 13

In minimum mode, this pin sends out TP7 Link and Carrier Sense status

6AUI_LED

(LI/RX6)

O

This pin transmits AUI port status synchronous to TCK

In minimum mode, this pin sends out TP6 Link and Carrier Sense status

7TP_BIT_LED

(LI/RX5)

O

This pin sends out global bit rate error status of the DM9081 Hub

In minimum mode, this pin sends out TP5 Link and Carrier Sense status

8

TP_POL_LED

(LI/RX4)

O

In minimum mode, this pin sends out TP4 Link and Carrier Sense status

10

TP_JAB_LED

(LI/RX3)

O

This pin transmits global jabber status of the DM9081 Hub

In minimum mode, this pin sends out TP3 Link and Carrier Sense status

11

TRAFFIC_LED

(LI/RX2)

O

This pin sends out utilization of 10MHz bandwidth synchronous to TCK

In minimum mode, this pin sends out TP2 Link and Carrier Sense status

12

TP_PAR_LED

(LI/RX1)

O

This pin sends out the partition status synchronous to TCK for the eight TP

ports

In minimum mode, this pin sends out TP1 Link and Carrier Sense status

13

TP_LINK_LED

(LI/RX0)

O

This pin sends out the link and carrier sense status synchronous to TCK for

the eight TP ports

In minimum mode, this pin sends out TP0 Link and Carrier Sense status

15

AUI1_CRS_LED

O

Active low for 52ms when AUI Port 1 detects carrier

16

AUI2_CRS_LED

O

Active low for 52ms when AUI Port 2 detects carrier

17

COL_LED

O

Active low for 26ms when collision is detected

25

TCK

O

A 10MHz clock synchronous to X2