AX88780 datasheet(12/55 Pages) ASIX

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AX88780

ASIX ELECTRONICS CORPORATION

2.7 Miscellaneous

Table 6: Miscellaneous signals group

Pin Name

Type

Pin No.

Pin Description

LINKLED

IO3,

12mA,

In power-on reset phase, this pin will be latched by AX88780 to determine that system

operates in 32 or 16-bit mode. High state is 16-bit mode and low state is 32-bit mode.

The default is in 32-bit mode.

Upon finishing reset status, if bit11 of PHY_CTRL register is enabled, this pin stands

for:

Link: indicates a good link status, active low in 16-bit mode and active high in 32-bit

mode. The link indicator only works under bit11 of PHY_CTRL register set by

driver.

Traffic: indicates the traffic status and flashes while in TX or RX state.

SPDLED

IO3,

12mA,

In power-on reset phase, this pin will be latched by AX88780 to determine whether

AX88780 swaps the data or not. If the high state, AX88780 will swap the data

(big-endian). The default is little-endian.

Upon finishing reset stage, if bit12 PHY_CTRL register is enabled, this pin stands for

speed mode. In little-endian mode, low indicates that PHY is in 10BASE-TX mode,

and high state indicates PHY is in 100BASE-T mode. In big-endian mode, low

indicates that PHY is in 100Mbase-T mode and high state indicates PHY is in

10Base-TX mode. The speed indicator only works under bit12 of PHY_CTRL register

set by driver.

This pin is tied to ground for normal operation.

TEST0

I3, PD

Pull down (by 4.7K) or floating for normal operation.

TEST1

I3, PD

Pull down (by 4.7K) or floating for normal operation.

XTLN

I25

25Mhz crystal or oscillator clock input. The recommended reference frequency is

25Mhz +/- 0.005% (i.e. 25Mhz +/- 1250hz).

This input pin is only 2.5V tolerant and should not apply 3.3V clock signal directly to

this pin if an external oscillator is used.

XTLP

25MHz crystal clock output. For 25MHz oscillator clock, this pin should be kept

floating.

RSTPB

I25

Pull-up for normal operation.

IBREF_WESD

I25

Connect a 12.3Kohm resistor to ground.

67,68

No connection

2.8 Power/ground pin

Table 7: Power/Ground pins group

Pin Name

Type

Pin No.

Pin Description

VCC33

VCC3

1,13,40, 105, 119

Digital 3.3V power

VCC25

VCC2

4,20,27,35,57,60,64,72,78,107,117,123

Digital 2.5V power

GND

8, 56, 73,106

Digital ground

VCC25A

VCC2

81,85,89,96,98,100

2.5V power for PHY analog part

GNDA

GND

82,86,87,92,95,99,101

Analog ground

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