AX88796ALF datasheet(17/68 Pages) ASIX

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AX88796ALF

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, +/- 30 PPM can be

connected across XTALIN and XTALOUT.

XTALOUT

Crystal Oscillator Output: A 25Mhz crystal, +/- 30 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 AX88796A into reset mode

immediately. During the falling edge the AX88796A 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.

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

13, 14, 17, 20, 21,

45, 46, 57, 64, 75,

77, 90, 94, 122,

124, 125

No Connection: for manufacturing test only.

VDD

27,

53, 104,

114, 126

Power Supply: +3.3V DC.

VSS

28, 34,

43, 52, 54, 63,

105,115,127

Power Supply: +0V DC or Ground Power.

VDDA

56, 69,

73, 82

Power Supply for Analog Circuit: +3.3V DC.

VSSA

55, 68,

72, 85,

Power Supply for Analog Circuit: +0V DC or Ground Power.

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