AX88852 datasheet(16/39 Pages) ASIX

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AX88850

PRELIMINARY

ASIX ELECTRONICS CORPORATION

2.5 Expansion Bus Interface

Signal Name

Type Pin No.

Description

IRD[3:0]

I/O/Z

/MH

/PU

164-161 INTER REPEATER DATA : Nibble data input/output. Transfer data from

the “active” AX88850 to all other “inactive” AX88850s. The bus-master of

the IRD bus is determined by IR_VECT bus arbitration.

/IRD_ER

I/O/Z

/MH

/PU

159

INTER REPEATER DATA ERROR: This signal reflect the RX_ER status

of the active port across the inter repeater bus. Used to track receive errors

from the PHY in real time.

/IRD_V

I/O/Z

/MH

/PU

158

INTER REPEATER DATA VALID : This signal reflect the RX_DV status

of the active port across the inter repeater bus. Used to frame good packets.

IRD_CK

I/O/Z

/MH

157

INTER REPEATER CLOCK VALID : All inter repeater signals

are

synchronized to the rising edge of this clock.

IRD_ODIR

O/L

154

INTER REPEATER DATA IN/OUT DIRECTION : This pin indicates the

direction of data for external transceiver.

“High” = IRD[3:0], /IRD_ER, /IRD_V , IRD_CK are Output.

“Low” = IRD[3:0], /IRD_ER, /IRD_V , IRD_CK are Input.

/IR_ACTO

[7:0]

I/O/OC

152-145 INTER REPEATER ACTIVITY IN/OUT: Then the local repeater activity

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

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

conditions. When collision occurred all of the signal of related (RID-1) pins

will served as outputs and will active during local collision period. The

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

/IR_ACTI[7:0]

RID[4:0]

/IR_ACTI[4:0]

/DIS_DAISY

/IR_ACTI[5]

/TO_ID_CLR

/IR_ACTI[6]

/IR_ACT_EN

/IR_ACTI[7]

I/PU

143-136

140-136

141

142

143

INTER REPEATER ACTIVITY IN: These pins perform the same function

as /IR_ACTO[7:0] when they serve as input function. Then the

/IR_ACTO[7:0] insert external buffers the input function must be replaced

with /IR_ACTI [7:0].

The /IR_ACTI[7:0] also serve as power-on configuration input:

Repeater Identification Number Parallel In RID[4:0]: When power on reset

these pin as inputs to setup the repeater ID of the chip. RID[2:0] indicate the

repeater ID from 0 to 7. RID[4:3] defines the group code in the cascade

system and must keep difference with PHY ID address definition.

Disable RID Daisy-chain Input. No matter what kind of data input from

DAISY_IN pin ,the repeater ID will never be changed from DAIST_IN.

Time Out to Clear repeater ID : Within the time out period, if no daisy chain

repeater ID input. The repeater ID will be clear to RID=0 . Otherwise, the

repeater ID will remain the previous value ( power on configured value ,

previous daisy chain reconfigured value or the configuration value written via

station management port).The tome out period is about 4 to 5 second.

/IR_ACTI[7:0] pins function is enable when IR_ACT_EN is pulled “low”

when power on. Otherwise , it is disable.

AX88852 Datasheet(PDF) 16 Page - ASIX Electronics Corporation

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