4.21 Clock Interface Signals –Table 3
Name
Type
Description
PCIECLKRQ0# /
GPIO73,
PCIECLKRQ1# /
GPIO18,
PCIECLKRQ2# /
GPIO20,
PCIECLKRQ3# /
GPIO25,
PCIECLKRQ4# /
GPIO26,
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 33.3MHz 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].