AX88796 datasheet(16/71 Pages) ASIX

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ASIX ELECTRONICS CORPORATION

AX88796 L

3-in-1 Local Bus Fast Ethernet Controller

2.8 Miscellaneous pins group

SIGNAL

TYPE

PIN NO.

DESCRIPTION

LCLK/XTALIN

CMOS Local Clock : A 25Mhz clock, +/- 100 PPM, 40%-60% duty

cycle. The signal not supports 5 Volts tolerance.

Crystal Oscillator Input : A 25Mhz crystal, +/- 25 PPM can be

connected across XTALIN and XTALOUT.

XTALOUT

Crystal Oscillator Output : A 25Mhz crystal, +/- 25 PPM can be

connected across XTALIN and XTALOUT. If a single-ended external

clock (LCLK) is connected to XTALIN, the crystal output pin should

be left floating.

CLKO25M

Clock Output : This clock is source from LCLK/XTALIN.

RESET

I/PU

Reset :

Reset is active high then place AX88796 into reset mode immediately.

During the falling edge the AX88796 loads the power on setting data.

CPU[1:0]

I/PU

59, 58

CPU type selection:

CPU[1]

CPU[0]

CPU TYPE

ISA BUS

80186

MC68K

MCS-51 (805X)

IO_BASE[2:1]

IO_BASE[0]

I/PU

I/PD

119, 118,

117

I/O Base Address Selection:

IO_BASE[2] IO_BASE[1] IO_BASE[0]

IO_BASE

300h

320h

340h

360h

380h

3A0h

200h(default)

220h

I_OP

I/PU

116

LED Indicator Option : Selection of LED display mode.

I_OP = 0: I_LK/ACT, I_SPEED and I_FULL/COL LED display

mode.

I_OP = 1: I_LINK, I_SPEED and I_ACT LED display mode. (default)

TEST[2:1]

I/PD

47, 65

Test Pins : Active high

These pins are just for test mode setting purpose only. Must be pull

down or keep no connection when normal operation.

IDDQ

For test only. Must be pulled down at normal operation.

BIST

I/PD

For test only. Must be pulled down or keep no connection when normal

operation.

ZVREG

This sets the common mode voltage for 10Base-T and 100Base-TX

modes. It should be connected to the center tap of the transmit side of

the transformer

N/A

17, 20, 21,

64, 122, 124,

125

No Connection : for manufacturing test only.

VDD

13, 27, 40,

53, 57, 104,

114, 126

Power Supply : +3.3V DC.

VSS

14, 28, 34,

43, 52, 54, 63,

94, 105,115,

127

Power Supply : +0V DC or Ground Power.

VDDA

56, 69,

Power Supply for Analog Circuit: +3.3V DC.

AX88796 数据表(PDF) 16 Page - ASIX Electronics Corporation

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