R
Table 3-1:
Edge Connector for PCI Express Operation
P13 Edge Connector Socket Pinout for PCI Express Designs (Continued)
P13 A Side
A30
A31
A32
A33
A34
A35
A36
A37
A38
A39
A40
A41
A42
A43
A44
A45
A46
A47
A48
A49
Signal
PERN3
GND
RESERVED
RESERVED
GND
PERP4
PERN4
GND
GND
PERP5
PERN5
GND
GND
PERP6
PERN6
GND
GND
PERP7
PERN7
GND
P13 B Side
B30
B31
B32
B33
B34
B35
B36
B37
B38
B39
B40
B41
B42
B43
B44
B45
B46
B47
B48
B49
Signal
RESERVED
PCIE_PRSNT2_B (1)
GND
PETP4
PETN4
GND
GND
PETP5
PETN5
GND
GND
PETP6
PETN6
GND
GND
PETP7
PETN7
GND
PCIE_PRSNT2_B (1)
GND
Notes:
1. PCIE_PRSNT1_B can be connected to one of three PCIE_PRSNT2_B signals by connecting a shunt on
connector P45. See Table 3-2 for application information.
2. No connect on the ML555 board.
3. The ML555 board layout provides two methods of interfacing the PCIE_REFCLK to the FPGA. The
default method is to AC couple the 100 MHz PCIE_REFCLK directly to the GTP_DUAL tile X0Y2
MGTREFCLK input pins. An alternative method is to remove two 0 Ω resistors and install an
ICS874003-02 PCI Express Jitter attenuator module, which provides a 100, 125, or 250 MHz reference
clock to the GTP transceiver. The jitter attentuator has two LVDS outputs that connect to the GTP and
FPGA global clock inputs. One of the jitter attentuator LVDS outputs is connected to the MGTREFCLK
inputs of GTP_DUAL tile X0Y2 for PCI Express lanes 0 and 1. The PCIE_REFCLK is also connected to
the FPGA global clock network on pins J16 and J17. Internal FPGA clock buffers distribute this clock to
other GTP_DUAL tiles for PCI Express operation. The architecture of the FPGA permits an external
MGTREFCLK to be driven a maximum of three GTP_DUAL tiles up or down. See “Serial Bus Clocking
information.
4. The PETPX and PETNX pins connect to the PCI Express transmitter differential pair on the system
board and the PCI Express receiver on the add-in card.
5. The PERPX and PERNX pins connect to the PCI Express receiver differential pair on the system board
and the PCI Express transmitter on the add-in card.
6. PCIE_PERST connects to FPGA pin AE14.
The PCI Express Card Electromechanical Specification requires add-in cards to implement
variable-length edge finger pads and tie PRSNT1_B and PRSNT2_B signals together on the
Virtex-5 FPGA ML555 Development Kit
UG201 (v1.4) March 10, 2008
25
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