ASIX AX88873P Datasheet

10/100BASE Dual Speed Repeater Controller

Features

100Mbps horizontal cascade

10Mbps and 100Mbps Vertical cascade upto 4 stacks

10Mbps horizontal cascade

2 Quad RMII PHY

2 Quad RMII PHY

2 Quad RMII PHY

PHY for Up-link

PHY for Down-link or Server

AX88873P

10/100BASE Dual Speed 8-Port Repeater

Ver. 1.1

• IEEE 802.3u repeater compatible

• Supports 8 10/100Mbps RMII I/F repeater ports

• Accompany with AX88872 to build a low cost dual

speed repeater solution

• Up-to 4 repeaters can be cascaded for vertical

expansion

• Up-to 3 chips can be cascaded locally for horizontal

expansion

• All ports can be separately isolated or partitioned in

response to fault condition

• Separate jabber and partition state machines for

each port

• Per-port LED display for Jabber, Partition, Activity

and global collision, utilization (%) for
10/100Mbps presentation

• Power on LED diagnosis. All the LED display will

follow the “ON-OFF-ON-OFF-Normal” operation
procedure during/after power on reset

• 50MHz Operation, 3.3volt and 128-pin PQFP

Product description

The AX88873 10/100Mbps Dual Speed repeater Controller is a counterpart of AX88872 without built in 4-ports
switch. It is design for low cost dual speed dumb HUB application.

The AX88873 directly supports up-to eight 10/100Mbps automatic links RMII interfaces. Maximum up-to 96
repeater ports can be constructed by stacking 1 AX88872 and 2 AX88873 chips horizontally and then cascading 4
horizontal boards vertically.

With using 128-pin low cost package, accompany with AX88872 to build up low cost dual speed repeater application.
Not only perform the repeater function but gain additional 2 switch ports. The 2 dual speed switch ports are connected
to external MII or RMII interfaces PHY for various applications. For example, one port is use for down link and the
other is used for up link to extend the network topology. The other case is one port for up link and the other port for
server.

The AX88873 is designed base on IEEE 802.3u clause 27 “ Repeater for 100Mb/s base-band networks” It is fully
compatible with IEEE 802.3u standard. Please refer Ax872-11.doc to get more information about AX88872.

System Block Diagram

Buffer

AX88873 #1

Repeater Controller

Always contact ASIX for possible updates before starting a design.

This data sheet contains new products information. ASIX ELECTRONICS reserves the rights to modify product specification without notice. No liability
is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

AX88873 #0

Repeater Controller

AX88872 #0

Swipeater Controller

ASIX ELECTRONICS CORPORATION Doc. No. AX873-11.DOC Date : APR/26/1999

2F, NO.13, Industry East Rd. II, Science-based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.
TEL: [phone] FAX: [phone] http://www.asix.com.tw

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

CONTENTS

1.0 AX88873 OVERVIEW....................................................................................................................................... 4

1.1 GENERAL DESCRIPTION...................................................................................................................................... 4

1.2 AX88873 BLOCK DIAGRAM:.............................................................................................................................. 4

1.3 PIN CONNECTION DIAGRAM ............................................................................................................................... 5

2.0 PIN DESCRIPTION........................................................................................................................................... 6

2.1 RMII INTERFACE FOR REPEATER PORTS............................................................................................................... 6

2.1.1 Repeater Port 0 .......................................................................................................................................... 6

2.1.2 Repeater Port 1 .......................................................................................................................................... 6

2.1.3 Repeater Port 2 .......................................................................................................................................... 7

2.1.4 Repeater Port 3 .......................................................................................................................................... 7

2.1.5 Repeater Port 4 .......................................................................................................................................... 7

2.1.6 Repeater Port 5 .......................................................................................................................................... 7

2.1.7 Repeater Port 6 .......................................................................................................................................... 8

2.1.8 Repeater Port 7 .......................................................................................................................................... 8

2.2 EXPANSION BUS INTERFACE FOR 100 MBPS......................................................................................................... 8

2.3 EXPANSION BUS INTERFACE FOR 10 MBPS........................................................................................................... 9

2.4 LED DISPLAY.................................................................................................................................................. 10

2.5 MISCELLANEOUS.............................................................................................................................................. 10

2.6 POWER ON CONFIGURATION SETUP SIGNALS CROSS REFERENCE TABLE ................................................................ 11

3.0 FUNCTIONAL DESCRIPTION..................................................................................................................... 12

3.1 REPEATER STATE MACHINE.............................................................................................................................. 12

3.2 RXE /TXE CONTROL...................................................................................................................................... 12

3.3 JABBER STATE MACHINE.................................................................................................................................. 12

3.4 PARTITION STATE MACHINE............................................................................................................................. 12

3.5 LED DISPLAY INTERFACE................................................................................................................................ 13

4.0 INTERNAL REGISTERS................................................................................................................................ 14

5.0 ELECTRICAL SPECIFICATION AND TIMING.......................................................................................... 15

5.1 ABSOLUTE MAXIMUM RATINGS........................................................................................................................ 15

5.2 GENERAL OPERATION CONDITIONS................................................................................................................... 15

5.3 DC CHARACTERISTICS..................................................................................................................................... 15

5.4 AC SPECIFICATIONS......................................................................................................................................... 16

5.4.1 RMII Interface Timing TX & RX............................................................................................................... 16

5.4.2 MII Interface Timing TX & RX................................................................................................................. 17

5.4.3 LED DISPLAY ......................................................................................................................................... 18

5.4.4 LED Display after Reset........................................................................................................................... 18

6.0 PACKAGE INFORMATION........................................................................................................................... 19

APPENDIX A: APPLICATIONS.......................................................................................................................... 20

A.1 16-PORT (24-PORT) REPEATER WITH 2-PORT SWITCH......................................................................................... 20

A.2 16-PORT REPEATER WITH UPTO 4 STACKS ......................................................................................................... 20

A.3 16-PORT REPEATER WITH UPTO 4 STACKS UP-LINK TO EXTERNAL SWITCH........................................................... 21

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CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

FIGURES

FIG - 1 AX88873 BLOCK DIAGRAM ............................................................................................................................. 4

FIG - 2 PIN CONNECTION DIAGRAM..............................................................................................................................5

FIG - 3 APPLICATION FOR LED DISPLAY..................................................................................................................... 13

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ASIX ELECTRONICS CORPORATION

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

1.0 AX88873 Overview

1.1 General Description

The AX88873 is a simple dual speed repeater that provides two expansion buses for 10M and 100M
segments respectively. Accompany with AX88872 (build-in a 4-port switch) can construct high port
count (16 ports or 24 ports) application and gain 2 additional switch ports. Additional two switch
ports are also useful for up-link or connection of server.

The pin count of chip is reduced to 128 when design uses RMII I/F instead of MII. It is not only
simplify the design but also user can choose low cost RMII Quad PHY.

1.2 AX88873 Block Diagram:

RMII
I/F

10/100
Q-PHY

RMII /MII
translation
for Repeater
Port 0 -7

10/100
Q-PHY

Per Port Jabber
Detection

Per Port Partition
Detection

Repeater State
Machine of 100Mbps

Repeater State
Machine of 10Mbps

Led Interface

Cascade
Arbitration Logic
of 100Mbps

Cascade
Arbitration Logic
of 10Mbps

Fig - 1 AX88873 Block Diagram

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CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

1.3 Pin Connection Diagram

VSS

TXD5[1]

RXD5[1]

TXD5[0]

TXEN5

CRS_DV5

RXD5[0]

CRS_DV6

RXD6[1]

RXD6[0]

TXD6[0]

TXD6[1]

TXEN6

CRS_DV7

RXD7[1]

RXD7[0]

NC

NC

VDD

SPEED5

SPEED6

SPEED7

VSS

SPEED4

RXD4[1]

TXEN4

TXD4[0]

TXD4[1]

RXD4[0]

CRS_DV4

TXD3[1]

TXD3[0]

TXEN3

RXD3[1]

CRS_DV3

RXD3[0]

VDD

SPEED3

HIRD[2]

HIRD[3]

NC

/HIRD_V

HIRD[0]

HIRD[1]

/HIR_ACTO[3]

HIRD_CK

HIRD_ODIR

VSS

/HIR_ACTI[3]

NC

/HIR_ACTO[0]

/HIR_ACTO[1]

/HIR_ACTO[2]

/HIR_ACTI[2]

VDD

/HIR_ACTI[0]

/HIR_ACTI[1]

/LHIR_ACT[2]

/LHIR_ACT[0]

/LHIR_ACT[1]

VSS

/TIR_ACTI[2]

/TIR_ACTO[1]

/TIR_ACTI[3]

/TIR_ACTO[0]

/TIR_ACTO[2]

/TIR_ACTO[3]

VDD

VSS

/TIR_ACTI[0]

/TIR_ACTI[1]

/LTIR_ACT[1]

/LTIR_ACT[2]

VSS

/LTIR_ACT[0]

TIRD[3]

SPEED0
CRS_DV0
RXD0[0]
RXD0[1]
VDD
TXEN0
TXD0[0]
TXD0[1]
SPEED1
VSS
CRS_DV1
RXD1[0]
RXD1[1]
TXEN1
VSS
TXD1[0]
TXD1[1]
VDD

SPEED2
CRS_DV2
RXD2[0]
RXD2[1]
TXEN2
TXD2[0]
TXD2[1]
VSS

103
104
105
106
107
108
109
110

111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

102

1

101

2

100

3

78

75

77

797480

84

829181

93

94

95

96

989799

90

86

87

8892858983

76

AX88873

8

7

4

6

5

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

73

30

72

31

71

32

70

33

69

34

68

35

67

36

66

37

65

38

64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46

45
44
43
42
41
40
39

TIRD[2]
TIRD[1]

TIRD[0]
VSS
/TIRD_V
TIRD_CK
TIRD_ODIR
VDD
LED_CK
LED<1>
LED<0>
VSS
DAISY_OUT
DAISY_IN
VSS
NC
VDD
REF_CLK
VSS

/RST
/TEST
MDO
MDC
TXD7[1]
TXD7[0]
TXEN7

Fig - 2 Pin Connection Diagram

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AX88873P 10/100Mb Repeater Controller PRELIMINARY

2.0 Pin Description

The following terms describe the AX88873 pin out:

All pin names with the “/” suffix are asserted low.

I = Input
O = Output
I/O = Input /Output

2.1 RMII interface for repeater ports

2.1.1 Repeater Port 0

Signal Name Type Pin No. Description

SPEED0 I 103

CRS_DV0 I 104

RXD0[1:0] I 106,105

TXEN0 O 108

TXD0[1:0] O 110,109

Speed Select : SPEED0 is not standard RMII signal. This signal is
sourced from PHY to inform repeater whether 10M or 100M speed is
auto-negociated. Active for 10Mbps speed is selected depending on
power on configuration.
Carrier Sense/Receive Data Valid : CRS_DV is asserted
asynchronously on detection of carrier. CRS_DV is asserted by the PHY
when receive medium is non-idle. Loss of carrier shall result in the
desertion of CRS_DV synchronous to the cycle of REF_CLK, which
presents the first DI-bit of a nibble on to RXD0[1:0].
Receive Data : RXD0[1:0] is synchronous to REF_CLK
RXD0[1:0] shall be “00” to indicate idle when CRS_DV is disserted.
Value other than “00” are reserved for out-of-band signaling shall be
ignored by MAC Upon assertion of CRS_DV, PHY shall ensure that
RXD[1:0] = “00” until proper receive decoding takes place
Transmit Enable : TXEN0 is synchronous to REF_CLK.
TXEN0 indicates that MAC is presenting DI-bits on TXD[1:0] for
transmission. TXEN0 shall be negated prior to the 1st REF_CLK rising
edge following the final DI-bit of a frame
Transmit Data : TXD0[1:0] shall transition synchronously to
REF_CLK. TXD0[1:0] shall be “00” to indicate idle when TX_EN is
disserted. Value other than “00” are reserved for out-of-band signaling
shall be ignored by PHY. When TX_EN is asserted, TXD[1:0] are
accepted for transmission by PHY

2.1.2 Repeater Port 1

Signal Name Type Pin No. Description

SPEED1 I 111

CRS_DV1 I 113

RXD1[1:0] I 115,114

TXEN1 O 116

TXD1[1:0] O 119,118

Speed Select : Please references section 2.1.1 PORT0 description.

Carrier Sense/Receive Data Valid : Please references section 2.1.1

PORT0 description.

Receive Data : Please references section 2.1.1 PORT0 description.

Transmit Enable : Please references section 2.1.1 PORT0 description.

Transmit Data : Please references section 2.1.1 PORT0 description.

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AX88873P 10/100Mb Repeater Controller PRELIMINARY

2.1.3 Repeater Port 2

Signal Name Type Pin No. Description

SPEED2 I 121

Speed Select : Please references section 2.1.1 PORT0 description.

CRS_DV2 I 122

RXD2[1:0] I 124,123 Receive Data : Please references section 2.1.1 PORT0 description.

TXEN2 O 125

TXD2[1:0] O 127,126

Carrier Sense/Receive Data Valid : Please references section 2.1.1
PORT0 description.

Transmit Enable : Please references section 2.1.1 PORT0 description.

Transmit Data : Please references section 2.1.1 PORT0 description.

2.1.4 Repeater Port 3

Signal Name Type Pin No. Description

SPEED3 I 1

CRS_DV3 I 2

RXD3[1:0] I 4,3

TXEN3 O 5

TXD3[1:0] O 7,6

Speed Select : Please references section 2.1.1 PORT0 description.

Carrier Sense/Receive Data Valid : Please references section 2.1.1

PORT0 description.

Receive Data : Please references section 2.1.1 PORT0 description.

Transmit Enable : Please references section 2.1.1 PORT0 description.

Transmit Data : Please references section 2.1.1 PORT0 description.

2.1.5 Repeater Port 4

Signal Name Type Pin No. Description

SPEED4 I 9

CRS_DV4 I 10

RXD4[1:0] I 12,11

TXEN4 O 13

TXD4[1:0] O 15,14

Speed Select : Please references section 2.1.1 PORT0 description.

Carrier Sense/Receive Data Valid : Please references section 2.1.1

PORT0 description.

Receive Data : Please references section 2.1.1 PORT0 description.

Transmit Enable : Please references section 2.1.1 PORT0 description.

Transmit Data : Please references section 2.1.1 PORT0 description.

2.1.6 Repeater Port 5

Signal Name Type Pin No. Description

SPEED5 I 19

CRS_DV5 I 20

RXD5[1:0] I 23,22

TXEN5 O 24

Speed Select : Please references section 2.1.1 PORT0 description.

Carrier Sense/Receive Data Valid : Please references section 2.1.1

PORT0 description.

Receive Data : Please references section 2.1.1 PORT0 description.

Transmit Enable : Please references section 2.1.1 PORT0 description.

TXD5[1:0] O 26,25

Transmit Data : Please references section 2.1.1 PORT0 description.

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