AX88852 datasheet(18/39 Pages) ASIX

18 / 39 page

AX88850

PRELIMINARY

ASIX ELECTRONICS CORPORATION

2.7 Miscellaneous

Signal Name

Type Pin No.

Description

LCLK or

TX_CLK

168

Local Clock : Must be run at 25Mhz . Used for transmit data to PHY devices,

/RST

165

Reset : The chip is reset when this signal is asserted Low.

RST_DLY

O/L

135

Reset Delay : The signal is active high when reset and delay /RST signal

about 2 LCLK cycle. It is useful for power on configuration setup control of

/IR_ACTI[7:0].

DAISY_IN

I/PU

133

Repeater Identification Number Daisy-Chain In : This pin is a daisy chain

serial input for Repeater ID. A state machine always monitor the input if a

correct data (RID) present at the pin, the (RID+1) will be written to RID

DAISY_OUT

O/L

134

Repeater Identification Number Daisy-Chain Out : 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.

TEST

I/PD

166

Test Pin : The pin is just for test mode setting purpose only. Must be pull low

when normal operation. When in test mode , GEP pins will be force to test

input signals.

GEP[3:0]

I/O/L

/PU

175-172 General Purpose I/O Pins : Those pins just for system application usage. I.e.

for output control or input status report.

When reset the default function is for inputs.

MEDIA

I/PD

130

Media selection :

External pull-down for AX88853 with 4.7K ohm resister.

External pull-up for AX88851, AX88852 and AX88854 with 4.7K ohm

resister.

OPTION

I/PU

129

Option : Option for repeater state machine. User must pull this pin up.

VDD

1,17,27,

33,52,73,

80,103,

128,132,

156,171,

184

POWER : +5V +/-5%

VSS

9,23,28,

39,60,79,

93,113,

121,131,

144,153,

160,167,

176,185,

198

POWER: 0V

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