ASIX ELECTRONICS CORPORATION

11

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

The pin is just for test mode setting purpose only. Must be pull high when

normal operation.

NC

O

16, 18

49,88

102

NC : Keep no connection

VDD

I

17, 34

48, 57

77, 89

107, 120

POWER : +3.3V +/-5%

VSS

I

8, 21

46, 50

53,61

69, 70

82, 94,

112, 117

128

POWER: 0V

2.6 Power on configuration setup signals cross reference table

Signal Name

Share with

Description

Speed_Define

TXD7[1]

Speed Setting for Repeater Port 0 to Port 7 :

0 : SPEED0~7 pin is Low for 10M,high for 100M

1 : SPEED0~7 pin is Low for 100M,high for 10M

LRID_S1

LRID_S0

TXD5[1]

TXD5[0]

Local Repeater ID Selection :

LRID_S1

LRID_S0

LRID No.

1

1

0

1

0

1

0

1

2

0

0

reserved

All of the above signals are pull-up for default values.

Note 1 :

The calculation formulae of Traffic Utilization between ASIX and NetCom is difference, so you will get different results

when using SmartBit (SB) testing this item.

We found the SmartBit calculate the Utilization without include 96 Bit time inter frame gap (IFG). So the utilization

value can be 100%. As well as we found SB used min packet size (64 byte) and min IFG (96 bit-time) as 100% utilization.

In theory, when max packet size (1518 byte) and min IFG the utilization will be more than 100%, but SB also treat it as

100%.

In our AX88873 design, we use real cable bandwidth as calculation base. We calculate the bit counts of carrier within a

unit time. Because of the existence of inter frame gap, In our calculation 100% utilization is impossible. So the above two

cases (64 byte packet size and 1518 byte packet size with min. IFG), we will count as 85.7% and 99.2%.

If using SB test result to indicate utilization LED the value must be modified. See the following reference table.

ASIX’s Utilization%

1

5

10

15

30

60

SmartBit’s Utilization%

2

7

12

17

34

68