Service Manual
125
GPIO_13 I/O
General-purpose input/output 13
126
GPIO_14 I/O
General-purpose input/output 14
127
PPWR O Panel power enable
128
AVDD_BIAS_33 P Analog 3.3V supply for LVDS PLL and Bandgap
12.2 U402 (Serial Flash)
Pin Symbol I/O Description
1 CE# I The device is enabled by a high to low transition on CE#. CE#
must remain low for the duration of any command sequence.
2 SO I/O To transfer commands, addresses, or data serially into the device.
3 WP# I/O The write protect (WP#) pin is used to enable/disable BPL bit in
the status register.
4 VSS G Connect ground
5 SI I/O To transfer commands, addresses, or data serially into the device
input are latched on the rising edge of the serial clock.
6 SCK I/O To provide the timing of serial interface.
Commands, addresses, or input data are latched on the rising
edge of the clock input, while output data is shifted out on the
Falling edge of the clock input.
7 HOLD I/O To temporarily stop serial communication with SPI flash
memory without resetting the device.
8 VDD P To provide power supply.
12.3 U901 (USB HUB IC)
Pin
Symbol I/O Description
1 VDDA33 +3.3V Filtered analog power
2 USBDP0 I/O This pin connect to the upstream USB bus data signal
3 USBDN0 I/O This pin connect to the upstream USB bus data signal
4 VSS Ground
5 USBDN1 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
6 USBDP1 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
7 VDDA33 +3.3V Filtered analog power
8 USBDP2 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
9 USBDN2 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
10
VSS Ground
11
USBDN3 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
12
USBDP3 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
13
VDDA33 +3.3V Filtered analog power
14
USBDP4 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
15
USBDN4 I/O This pin connect to the downstream USB peripheral device
attached to the HUB ports
16
VSS Ground
17
NC Not Connect
18
NC Not Connect
19
AM4/LED-EN I/O Amber indicator LED for port 4. Will be active low when LED
support is enabled via EEPROM or SMBus.
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