PCH and System Clocks
114 Datasheet
Table 4-2. Clock Outputs
Clock Domain Frequency
Spread
Spectrum
Usage
CLKOUT_PCI[4:0] 33 MHz Yes
Single Ended 33 MHz outputs to PCI connectors/
devices. One of these signals must be connected
to CLKIN_PCILOOPBACK to function as a PCI
clock loopback. This allows skew control for
variable lengths of CLKOUT_PCI[4:0].
Note: Not all SKUs may support PCI devices.
See Section 1.3 for details.
CLKOUT_DMI_P,
CLKOUT_DMI_N
100 MHz Yes
100 MHz PCIe* Gen2.0 differential output to the
processor for DMI/BCLK.
CLKOUT_PCIE[7:0]_P,
CLKOUT_PCIE[7:0]_N
100 MHz Yes
100 MHz PCIe Gen2.0 specification differential
output to PCI Express devices.
CLKOUT_PEG_A_P,
CLKOUT_PEG_A_N,
CLKOUT_PEG_B_P,
CLKOUT_PEG_B_N,
100 MHz Yes
100 MHz PCIe Gen2 specification differential
output to PCI Express Graphics devices.
CLKOUT_ITPXDP_P,
CLKOUT_ITPXDP_N
100 MHz Yes
Used as 100 MHz Clock to processor XDP/ITP on
the platform.
CLKOUT_DP_P,
CLKOUT_DP_N
120 MHz Yes
120 MHz Differential output to processor for
embedded DisplayPort
CLKOUTFLEX0/ GPIO64
33 MHz /
14.31818 MHz /
27 MHz (SSC/
non-SSC) /48
MHz / 24MHz
No
33 MHz, 48/24 MHz or 14.31818 MHz outputs for
various platform devices such as PCI/LPC or
SIO/EC devices, 27 MHz (SSC/non-SSC) clock
for discrete graphics devices.
CLKOUTFLEX1/ GPIO65,
CLKOUTFLEX3/ GPIO67
14.31818 MHz /
27 MHz (SSC/
non-SSC) /
48 MHz / 24 MHz
No
48/24 MHz or 14.31818 MHz outputs for various
platform devices such as PCI/LPC or SIO/EC
devices, 27 MHz (SSC/non-SSC) clock for
discrete graphics devices.
CLKOUTFLEX2/ GPIO64
33 MHz / 25 MHz
/ 14.31818 MHz
/ 27MHz (SSC/
non-SSC) /
48 MHz / 24 MHz
No
33 MHz, 25MHz, 48/24 MHz or 14.31818 MHz
outputs for various platform devices such as PCI/
LPC or SIO/EC devices, 27 MHz (SSC/non-SSC)
clock for discrete graphics devices.
SPI_CLK
17.86 MHz/
31.25 MHz
No
Drive SPI devices connected to the PCH.
Generated by the PCH.
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