ML605 Hardware User Guide
35
UG534 (v1.9) February 26, 2019
Detailed Description
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.
is a diagram of the PCIe MGT bank 114 and 115 clocking.
PCIe lane width/size is selected via jumper J42 as shown in the figure below. 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
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P1
U1
B
a
nk 115
IC
S
874001
IC
S
854104
,-
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
s
ign
a
l nomencl
a
t
u
re i
s
from per
s
pective of the
s
y
s
tem/mother
b
o
a
rd.
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-L
a
ne
Edge
Connector
MGTTX
P/N[
3
:0]
MGTRX
P/N[
3
:0]
U1
B
a
nk 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-2X
3
PCIE_PR
S
NT_B
PCIE_PR
S
NT_X8
PCIE_PR
S
NT_X4
PCIE_PR
S
NT_X1
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