AX99100QI datasheet(11/70 Pages) ASIX

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AX99100

PCIe to Multi I/O Controller

1.4.1

GPIO and Mode Setting

Table 1-4: GPIO and Mode Setting Pin Description

GPIO and Mode Setting Pins

Pin Name

Type

Pin No

Pin Description

GPIO[23:8]

B5/CU/4m

31, 32,

33, 34,

38, 40,

41, 42,

43, 44,

45, 46,

47, 48,

49, 50

General Purpose I/O signal

GPIO[15:8] are only valid when CHIP_MODE = 100 and 110.

GPIO[23:16] are only valid when CHIP_MODE = 100 and 110 and Port 4 was

disabled by HWCFGEE. Please reference to Section 3.

GPIO7

B5/CU/8m

General Purpose Output signal

GPIO7 has an optional function is external wakeup pin in input direction. When

AX99100 entered to L2 mode, this pin can be used to wakeup AX99100 also.

GPIO6

B5/CU/8m

General Purpose Output signal

GPIO6 has an optional function is a power-down control signal to power down

the external transceiver when AX99100 entered to L2 mode. This function can be

enabled by setting bit1 and the polarity selection is bit0 in configuration

EEPROM, offset 0x55.

GPIO5/

CHIP_MODE[2]

O5/ 8m

General Purpose Output signal when chip exited reset and operating in normal

functional mode.

These pins are input direction during chip reset use to bootstrap the mode setting

to decide the chip operation mode. Please reference to Section 3.1.

GPIO4/

CHIP_MODE[1]

O5/8m

GPIO3/

CHIP_MODE[0]

O5/8m

GPIO2

O5/8m

General Purpose Output signal when chip exited reset and operating in normal

functional mode.

This pin should be connected to the AUX 3.3V in PCIe slot via an external

pull-up resistor. It is used to detect the 3.3V AUX is existed or not.

GPIO1

B5/CU/8m

General Purpose I/O signal

GPIO0

B5/CU/8m

General Purpose I/O signal

Note: Above GPIO[7:0] are only valid when CHIP_MODE ≠ 000.

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