20 www.xilinx.com Spartan-6 FPGA GTP Transceiver Wizard v1.8
UG546 (v1.8) December 14, 2010
Chapter 3: Running the Wizard
Table 3-1: Select Transceiver and Reference Clocks
Option Description
Tile Location
Select the individual GTPA1_DUAL transceiver pairs by location to be
used in the target design. The PCI EXPRESS example requires one
transceiver pair.
GTP0 REFCLK
Determines the source for the reference clock signal provided to the
GTP0 transceiver in the selected GTPA1_DUAL primitive (see
Table 3-2, page 20). Differential clock signal input pin pairs are
provided for each GTPA1_DUAL. Individual transceivers have access
to the reference clock signals for the two horizontally adjacent
GTPA1_DUAL primitives allowing two primitives to share a single
reference clock signal. The PCI EXPRESS example uses the REFCLK
X0Y0 signal from the upper pair of selected primitives.
GTP1 REFCLK Same as above for the GTP1 transceiver.
Advanced
Clocking
Use this check box to bring out all possible reference clock ports to the
generated wrapper.
Table 3-2: Reference Clock Source Options
Option Description
GREFCLK Reference clock driven by internal fabric. Lowest performance option.
REFCLK_X0Y0
External GTPA1_DUAL reference clock signal local to first upper
transceiver pair.
REFCLK_X1Y0
External GTPA1_DUAL reference clock signal local to second upper
transceiver pair.
REFCLK_X0Y1
External GTPA1_DUAL reference clock signal local to first lower
transceiver pair. Not available on devices with fewer than four
transceiver pairs.
REFCLK_X1Y1
External GTPA1_DUAL reference clock signal local to second lower
transceiver pair. Not available on devices with fewer than four
transceiver pairs.
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