Datasheet
LPC Interface Bridge Registers (D31:F0)
Intel® Xeon® Processor D-1500 Product Family 319
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
7.10.12 GP_IO_SEL2—GPIO Input/Output Select 2 Register
Offset Address: GPIOBASE +34h Attribute: R/W
Default Value: 1F57FFF4h
Lockable: Yes Power Well: Core for 0:7, 16:23,
Resume for 8:15, 24:31
This register corresponds to GPIO[63:32].
7.10.13 GP_LVL2—GPIO Level for Input or Output 2 Register
Offset Address: GPIOBASE +38h Attribute: R/W
Default Value: A4AA0007h Size: 32 bits
Lockable: Yes Power Well: Core for 0:7, 16:23,
Resume for 8:15, 24:31
This register corresponds to GPIO[63:32].
7.10.14 GPIO_USE_SEL3—GPIO Use Select 3 Register
Offset Address: GPIOBASE +40h Attribute: R/W
Default Value: 00000130h Size: 32 bits
Lockable: Yes Power Well: Core for 0:7, 16:23,
Resume for 8:15, 24:31
This register corresponds to GPIO[75:64]. Bit 0 corresponds to GPIO64 and bit 11
corresponds to GPIO75.
Bit Description
31:0 GP_IO_SEL2[63:32] — R/W.
0 = GPIO signal is programmed as an output.
1 = Corresponding GPIO signal (if enabled in the GPIO_USE_SEL2 register) is programmed as an
input.
Notes:
If GPIO[n] does not exist, then, the (n-32) bit in this register will always read as 0 and
writes will have no effect.
Bit Description
31:0 GP_LVL[63:32] — R/W. These registers are implemented as dual read/write with dedicated storage
each. Write value will be stored in the write register, while read is coming from the read register
which will always reflect the value of the pin. If GPIO[n] is programmed to be an output (using the
corresponding bit in the GP_IO_SEL register), then the corresponding GP_LVL[n] write register value
will drive a high or low value on the output pin.
1 = high, 0 = low.
When configured in native mode (GPIO_USE_SEL[n] is 0), writes to these bits are stored but have
no effect to the pin value. The value reported in this register is undefined when programmed as
native mode.
Notes:
If GPIO[n] does not exist, then, the (n-32) bit in this register will always read as 0 and
writes will have no effect.
Bit Description
31:12 Always 0. No corresponding GPIO.