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32 www.xilinx.com ML605 Hardware User Guide
UG534 (v1.2.1) January 21, 2010
Chapter 1: ML605 Evaluation Board
9. PCI Express Endpoint Connectivity
The 8-lane PCIe edge connector performs data transfers at the rate of 2.5 GT/s for a Gen1
application and 5.0 GT/s for a Gen2 application. The Virtex FPGA GTX MGTs are used for
the multi-gigabit per second serial interfaces.
The ML605 board trace impedance on all PCIe lanes supports both Gen1 and Gen2
applications. The ML605 supports up to Gen1 x8 and Gen2 x4 as shipped with a -1 speed
grade for the LX240T device.
Figure 1-11, page 32 is a diagram of the PCIe MGT bank 114 and 115 clocking.
PCIe lane width/size is selected via jumper J42 as shown in Figure 1-12. The default lane
size selection is 1-lane (J42 pins 1 and 2 jumpered).
X-Ref Target - Figure 1-11
Figure 1-11: PCIe MGT Banks 114 and 115 Clocking
UG534_11_100809
P1
U1
Bank 115
ICS874001
ICS854104
REFCLK+,-
PERp,n[7:0]
PCIE_TX[7:0]_P/N
PCIE_RX[7:0]_P/N
MGTREFCLK0 P/N
PETp,n[7:0]
PCIE_CLK_Q0_P/N
Note: PCIe edge connector signal nomenclature is
from perspective of the system/motherboard.
PCIE_100M_MGT1_P/N
PCIE_100M_MGT0_P/N
PCIE_100M_MGT0_C_P/N PCIE_250M_MGT1_C_P/N
PCIE_250M_MGT1_P/N
CLK/NCLK
PCIe
8-Lane
Edge
Connector
MGTTX
P/N[3:0]
MGTRX
P/N[3:0]
U1
Bank 114
MGTREFCLK0 P/N
MGTTX
P/N[7:4]
MGTRX
P/N[7:4]
U14
Q1/NQ1
Q0/NQ0
CLK/NCLK
U9
Q/NQ
X-Ref Target - Figure 1-12
Figure 1-12: PCIe Lane Size Select Jumper J42
J42
1
2
3
4
5
6
H-2X3
PCIE_PRSNT_B
PCIE_PRSNT_X8
PCIE_PRSNT_X4
PCIE_PRSNT_X1
UG534_12_111709