ASIX ELECTRONICS CORPORATION

8

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

2.1.7 Repeater Port 6

Signal Name

Type

Pin No.

Description

SPEED6

I

27

Speed Select : Please references section 2.1.1 PORT0 description.

CRS_DV6

I

28

Carrier Sense/Receive Data Valid : Please references section 2.1.1

PORT0 description.

RXD6[1:0]

I

30,29

Receive Data : Please references section 2.1.1 PORT0 description.

TXEN6

O

31

Transmit Enable : Please references section 2.1.1 PORT0 description.

TXD6[1:0]

O

33,32

Transmit Data : Please references section 2.1.1 PORT0 description.

2.1.8 Repeater Port 7

Signal Name

Type

Pin No.

Description

SPEED7

I

35

Speed Select : Please references section 2.1.1 PORT0 description.

CRS_DV7

I

36

Carrier Sense/Receive Data Valid : Please references section 2.1.1

PORT0 description.

RXD7[1:0]

I

38,37

Receive Data : Please references section 2.1.1 PORT0 description.

TXEN7

O

39

Transmit Enable : Please references section 2.1.1 PORT0 description.

TXD7[1:0]

O

41,40

Transmit Data : Please references section 2.1.1 PORT0 description.

2.2 Expansion Bus Interface for 100 Mbps

Signal Name

Type Pin No.

Description

HIRD[3:0]

I/O/Z

/PU

101,100

99,98

INTER REPEATER DATA : Nibble data input/output. Transfer data from

the “active” AX88872/3 to all other “inactive” AX88872/3 chips. The bus-

master of the IRD bus is determined by IR_ACT bus arbitration.

/HIRD_V

I/O/Z

/PU

97

INTER REPEATER DATA VALID : This signal reflects the RX_DV

status of the active port. Used to frame good packets.

HIRD_CK

I/O/Z

/PU

96

INTER REPEATER CLOCK VALID : All inter repeater signals are

synchronized to the rising edge of this clock.

HIRD_ODIR

O

95

INTER REPEATER DATA IN/OUT DIRECTION :

This pin indicates the direction of IRD data .

“High” = HIRD[3:0], /HIRD_V , HIRD_CK are Output.

“Low” = HIRD[3:0], /HIRD_V , HIRD_CK are Input.

/LHIR_ACT[2:0]

I/O/OC 83,81,80 LOCAL REPEATER ACTIVITY IN/OUT : the function is the same as

/HIR_ACTO[3:0] but for local repeater activity only.

/HIR_ACTI[3:0]

I/PU

87,86

85,84

INTER REPEATER ACTIVITY IN: These pins perform the same

function as /HIR_ACTO[3:0] when they serve as input function. Then the

/HIR_ACTO[3:0] insert external buffers the input function must be replaced

with /HIR_ACTI [3:0].

/HIR_ACTO[3:0]

I/O/OC

93,92

91,90

INTER REPEATER ACTIVITY IN/OUT: The local repeater activity

appearance, the signal of the related RID (Repeater ID) will be asserted and

as an output pin. All other pins serve as input pins but except the collision

conditions. When collision occurs , the signal of related (RID-1) pins will

also serve as outputs and will active during local collision period. The

exception case is when RID = 0, then (RID-1) is replaced with (RID+1).