AX99100QF datasheet(9/70 Pages) ASIX

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AX99100

PCIe to Multi I/O Controller

Signal Description

1.4

Following abbreviations are used in “Type” column of following pin description tables. Note that some I/O pins with

multiple signal definitions on the same pin may have different attribute in “Type” column for different signal

definition.

Analog Bi-directional I/O

Output, 3.3V with 5V tolerant

Analog Input

Internal Pull-Up (75K)

Analog Output

Bi-directional I/O, 3.3V

Internal Pull-Down (75K)

Controllable internal Pull-Up

Bi-directional I/O, 3.3V with 5V tolerant

Power and ground pin

Schmitt Trigger

Input, 3.3V

Tri-state

Input, 3.3V with 5V tolerant

4mA driving strength

Output, 3.3V

8mA driving strength

For example, pin 5 in AX99100 package can be RXD1 or AD3. If RXD1 is selected, its Type is I5/PU; if AD3 is

selected, its Type is B5/4m. In other words, the PU (internal pull-up) only takes effect in RXD1 signal mode while

AD3 signal mode doesn’t. User should refer to the table specific to desired function for exact pin type definition.

The multi-function pin settings are configured by pin 54, 56 and 58 to decide the chip operating mode. Please

reference to Section 3 in detailed. The following abbreviations are used in pin description tables.

HWCFGEE

2C Hardware Configuration EEPROM

CHIP_MODE Chip Operating Mode, Setting by external pull the pin 54, 56 and 68

Table 1-1: Common Pin Description

Common Pins

Pin Name

Type

Pin No

Pin Description

TEST_MODE

I5/PD

Test Mode enable. For normal operation, please always tie to logic low or NC.

EXT_CLK

External Clock Input from external Oscillator.

EXT_CLK_PDn B5

External Clock Power Down enable.

0: Power down external Oscillator.

1: Enable external Oscillator.

Note: When external Oscillator existed, this pin should be pull down by external

resistor for boot strapping latch. Otherwise, please pull-up by external

resistor to indicate NO external Oscillator existed.

SCL

O5/T/4

2C Serial Clock line for I2C master controller.

SCL is a tri-stateable output, which requires an external pull-up resistor.

SDA

B5/T/4

2C Serial Data line for I2C master controller.

SDA is a tri-stateable output, which requires an external pull-up resistor.

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