AX88178
USB to 10/100/1000 Gigabit Ethernet/HomePNA Controller
FORCEFS_N
LED
I3/PU
15
Force USB Full Speed (active low). For normal operation, user should
keep this pin NC to enable USB High Speed handshaking process to
decide the speed of USB bus. Setting this pin low sets the device to
operate at Full speed mode only and disables Chirp K (HS
handshaking process).
LED indicator: When USB bus is in Full speed, this pin drives high
continuously. When USB bus is in High speed, this pin drives low
continuously. This pin drives high and low in turn (blinking) to
indicate TX data transfer going on whenever the host controller sends
bulk out data transfer.
O3
125
126
USB_SPEED_LE
D
O3
USB bus speed LED indicator. When USB bus is in Full speed, this
pin drives high continuously. When USB bus is in High speed, this
pin drives low continuously.
TESTSPEEDUP
I3/PD
13
42
43
44
45
46
65
Test pin. For normal operation, user should keep this pin NC.
Test pin. For normal operation, user should keep this pin NC.
Test pin. For normal operation, user should keep this pin NC.
Test pin. For normal operation, user should keep this pin NC.
Test pin. For normal operation, user should keep this pin NC.
Test pin. For normal operation, user should keep this pin NC.
Debug pin. For normal operation, user should connect to AVDDK
through a pulled-up resistor.
HS_TEST_MODE I3/PD
SCAN_TEST I3/PD
SCAN_ENABLE I3/PD
CLK60EXT
CLKSEL
DB
I3/PD
I3/PD
I2
On-chip Regulator Pins
INT_REGULATO
R_EN
I
20
On-chip 3.3V to 2.5V voltage regulator enable. Connect this pin to
VDDAH directly to enable on-chip regulator. Connect this pin to
GNDAH to disable on-chip regulator.
VDDAH
GNDAH
V25
P
P
P
22
23
21
3.3V Power supply to on-chip 3.3V to 2.5V voltage regulator.
Ground pin of on-chip 3.3V to 2.5V voltage regulator.
2.5V voltage output of on-chip 3.3V to 2.5V voltage regulator.
Power and Ground Pins
VDDK
P
16, 24, 74, Digital Core Power. 2.5V.
99, 118
VDD2
VDD3
P
P
80, 86, 123 Digital I/O Power. 2.5V.
8, 19, 41, Digital I/O Power. 3.3V.
97, 128
GND
P
7, 17, 18, Digital Ground.
25, 40, 75,
81, 87, 98,
100, 119,
124, 127
AVDDK
P
49, 53, 57, Analog Core Power. 2.5V.
64, 66, 68
AVDD3
AGND
P
P
28, 37, 39 Analog I/O Power. 3.3V.
29, 33, 38, Analog Ground.
50, 54, 55,
60, 63, 67,
69
8
ASIX ELECTRONICS CORPORATION
ASIX [ ASIX ELECTRONICS CORPORATION ]
