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KC705 Evaluation Board
UG810 (v1.3) May 10, 2013
Chapter 1:
KC705 Evaluation Board Features
For more information on the GTX transceivers see
,
7 Series FPGAs GTX Transceivers
User Guide
.
PCI Express Edge Connector
[
, callout
The 8-lane PCI Express 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 PCIe transmit and receive
signal data paths have a characteristic impedance of 85
Ω
±10%. The PCIe clock is routed as
a 100
Ω
differential pair. The 7 series FPGAs GTX transceivers are used for multi-gigabit per
second serial interfaces.
The XC7K325T-2FFG900C FPGA (-2 speed grade) included with the KC705 board supports
up to Gen2 x8.
The PCIe clock is input from the edge connector. It is AC coupled to the FPGA through the
MGTREFCLK1 pins of Quad 115. PCIE_CLK_Q0_P is connected to FPGA U1 pin U8, and
the _N net is connected to pin U7. The PCI Express clock circuit is shown in
.
MGT_BANK_116
GTXE2_CHANNEL_X0Y4
PCIe3
GTXE2_CHANNEL_X0Y5
PCIe2
GTXE2_CHANNEL_X0Y6
PCIe1
GTXE2_CHANNEL_X0Y7
PCIe0
MGTREFCLK0
Si5324
MGTREFCLK1
FMC LPC GBT_CLK0
MGT_BANK_117
GTXE2_CHANNEL_X0Y8
SMA
GTXE2_CHANNEL_X0Y9
SGMII
GTXE2_CHANNEL_X0Y10
SFP+
GTXE2_CHANNEL_X0Y11
FMC LPC DP0
MGTREFCLK0
SGMII_CLK
MGTREFCLK1
SMA_CLK
MGT_BANK_118
GTXE2_CHANNEL_X0Y12
FMC HPC DP0
GTXE2_CHANNEL_X0Y13
FMC HPC DP1
GTXE2_CHANNEL_X0Y14
FMC HPC DP2
GTXE2_CHANNEL_X0Y15
FMC HPC DP3
MGTREFCLK0
FMC HPC GBT_CLK0
MGTREFCLK1
FMC HPC GBT_CLK1
Table 1-10:
GTX Interface Connections for FPGA U1
(Cont’d)
Transceiver Bank
Associated Net Name
Connections