LPC47M172_07 SMSC [SMSC Corporation], LPC47M172_07 Datasheet - Page 124

• Manufacturer Part Number: LPC47M172_07
• Description: Advanced I/O Controller with Motherboard GLUE Logic
• Manufacturer: SMSC [SMSC Corporation]

Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
7.27.1 GPIO Pins
Note 1:
7.27.2 Description
SMSC/Non-SMSC Register Sets (Rev. 01-11-07)
nCDC_DWN
_ENAB
GP10
GP11
GP12
GP13
GP14
GP15
GP16
GP17
DDCSDA_5V
DDCSCL_5V
DDCSDA_3V
DDCSCL_3V
FUNCTION
DEFAULT
I/O and can be individually enabled to generate a PME (except GP24). GPIOs must be programmed as
inputs to generate a PME.
The Table 7.16 summarizes the GPIO functionality, including PME, Either Edge Triggered Interrupt (EETI)
input capability and the power source for the buffer on the I/O pads.
When DDC functions are selected, these pins require external pull-ups to appropriate voltages.
Each GPIO port has a 1-bit data register and an 8-bit configuration control register. The data register for
each GPIO port is represented as a bit in one of the 8-bit GPIO DATA Registers, GP1 to GP2. The bits in
these registers reflect the value of the associated GPIO pin as follows. Pin is an input: The bit is the value
of the GPIO pin. Pin is an output: The value written to the bit goes to the GPIO pin. Latched on read and
write. All of the GPIO registers are located in the GPIO/Runtime Register logical device (see GPIO
Runtime Registers section when LD_NUM=0 and Chapter 10 Runtime Register Block Runtime Registers
sections when LD_NUM=1). The GPIO ports with their alternate functions and configuration state register
addresses are listed in Table 7.17.
ALT FUNC 1
GP24
-
-
-
-
-
-
FAN_TACH1
(Note 1)
FAN_TACH2
(Note 1)
GP20
GP21
GP22
GP23
-
-
-
-
-
-
-
-
-
EETI0
EETI1
-
-
ALT FUNC 2
Table 7.16 - GPIO Summary
DATASHEET
VTR
VTR
VTR
VTR
VTR
VTR
VTR
VTR
VTR
VTR
VTR
VTR
VTR
PWR WELL
Note 1
Note 1
Note 1
Note 1
Page 124
-
-
-
-
-
-
-
-
-
-
-
-
-
RESET
PCI
-
-
-
-
-
-
-
-
-
-
-
-
-
VCC POR
Input
Input
Input
Input
Input
Input
Input
Input
Input
Hi-Z
Hi-Z
Hi-Z
Hi-Z
VTR POR
SMSC LPC47M172
PME/EETI
-
PME
PME
PME
PME
PME
PME
PME
PME
PME/EETI
PME/EETI
PME
PME