Datasheet 73
Signal Description
CLKOUT_PCIE[7:0]
_P,
CLKOUT_PCIE[7:0]
_N
O
100 MHz PCIe Gen2 specification differential output to PCI
Express devices
CLKIN_GND0_P,
CLKIN_GND0_N
(Desktop Only)
CLKIN_GND1_P,
CLKIN_GND1_N
I
Requires external pull-down termination (can be shared
between P and N signals of the differential pair).
PCIECLKRQ0# /
GPIO73,
PCIECLKRQ1# /
GPIO18,
PCIECLKRQ3# /
GPIO25,
PCIECLKRQ4# /
GPIO26
(all the above
CLKRQ# signals are
Mobile Only)
I
Clock Request Signals for PCI Express 100 MHz Clocks
Can instead by used as GPIOs
NOTE: External pull-up resistor required if used for CLKREQ#
functionality
PCIECLKRQ2# /
GPIO20,
PCIECLKRQ5# /
GPIO44,
PCIECLKRQ6# /
GPIO45,
PCIECLKRQ7# /
GPIO46
I
Clock Request Signals for PCI Express 100 MHz Clocks
Can instead by used as GPIOs
NOTE: External pull-up resistor required if used for CLKREQ#
functionality
CLKOUT_PCI[4:0] O
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].
CLKIN_PCILOOPBA
CK
I
33 MHz PCI clock feedback input, to reduce skew between PCH
on-die PCI clock and PCI clock observed by connected PCI
devices
CLKOUTFLEX0
1
/
GPIO64
O
Configurable as a GPIO or as a programmable output clock
which can be configured as one of the following:
• 33 MHz
• 27 MHz (SSC/Non-SSC)
• 48/24 MHz
• 14.318 MHz
• DC Output logic ‘0’
CLKOUTFLEX1
1
/
GPIO65
O
Configurable as a GPIO or as a programmable output clock
which can be configured as one of the following:
• Non functional and unsupported clock output value (Default)
• 27 MHz (SSC/Non-SSC)
• 14.318 MHz output to SIO/EC
• 48/24 MHz
• DC Output logic ‘0’
Table 2-19. Clock Interface Signals (Sheet 2 of 3)
Name Type Description
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