ASIX ELECTRONICS CORPORATION

10

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

2.4 LED Display

Signal Name

Type Pin No.

Description

LED[1:0]

O

55, 54

Those signals indicate each port‘s statuses (such as activity, jabber and

partition) and global information(such as Collision , Repeater ID,

Utilization ) in sequence. For detail , see the LED timing specification

The utilization of 100M segment and 10M segment are using the same scale.

The Utilization % display define as following : (See Note 1 also)

1: Led off

0: Led on

LED[0] : This signal also indicates 100M repeater collision ( Blinking )

during the interval of sequence shift

data.

LED[1] : This signal also indicates 10 M repeater collision ( Blinking )

during the interval of sequence shift data.

LED_CK

O

56

LED Clock : The signal is a discontinue clock for LED signals serial shift

out. The clock period width is 400nS and last 32 cycle with every 52.4ms

repeated.

2.5 Miscellaneous

Signal Name

Type Pin No.

Description

/RST

I

45

Reset : Active Low

The chip is reset when this signal is asserted Low

REF_CLK

I

47

Reference clock : The input is a continuous clock at 50Mhz for timing

reference with RMII interface.

DAISY_IN

I/PU

51

Repeater Identification Number Daisy-Chain In : When MODE=” 1” ,

This pin is a daisy chain serial input for Repeater ID. A state machine always

monitors the input if a correct data (RID) present at the pin, the (RID+1) will

be written to RID register and override the power on setup RID for the chip.

DAISY_OUT

O/ML

52

Repeater Identification Number Daisy-Chain Out : When MODE=” 1” ,

This pin is periodically shift out the RID of itself to the next chained chip to

inform that this ID has already been occupied. The RID is shift out

periodically every about 200us.

MDO

O

43

Station Management Data Out : For setup PHY auto-negotiation registers.

A burst write commands are issue to setup PHY register after reset. The PHY

address 4h, 5h, 6h, 7h, 8h, 9h,Ah and Bh will be written as register 4h to

value 00A1h ( Advertise register set to 10/100 half-duplex mode)and register

0h to value 1000h(Enable auto-negotiation).

MDC

O

42

Station Management Data Clock Out : For MDO reference clock.

/TEST

I/PD

44

Test Pin : Active LOW

Utilization %

UTI0

UTI1

UTI2

UTI3

UTI4

UTI5

0

1

1

1

1

1

1

1

0

1

1

1

1

1

5

0

0

1

1

1

1

10

0

0

0

1

1

1

15

0

0

0

0

1

1

30

0

0

0

0

0

1

60

0

0

0

0

0

0