AX88873P datasheet(9/21 Pages) ASIX

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ASIX ELECTRONICS CORPORATION

CONFIDENTIAL

AX88873P 10/100Mb Repeater Controller PRELIMINARY

2.3 Expansion Bus Interface for 10 Mbps

Signal Name

Type Pin No.

Description

TIRD[3:0]

I/O/Z

/PU

65,64

63,62

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.

/TIRD_V

I/O/Z

/PU

INTER REPEATER DATA VALID : This signal reflects the RX_DV

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

TIRD_CK

I/O/Z

/PU

INTER REPEATER CLOCK VALID : All inter repeater signals are

synchronized to the rising edge of this clock.

TIRD_ODIR

INTER REPEATER DATA IN/OUT DIRECTION :

This pin indicates the direction of data for external transceiver.

“High” = TIRD[3:0], /TIRD_V , TIRD_CK are Output.

“Low” = TIRD[3:0], /TIRD_V , TIRD_CK are Input.

/LTIR_ACT[2:0]

I/O/OC 68,67,66 LOCAL REPEATER ACTIVITY IN/OUT : the function is the same as

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

/TIR_ACTI[3:0]

I/PU

74,73,

72,71

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].

/TIR_ACTO[3:0]

I/O/OC

79,78

76,75

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).

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