ADM-XRC-7V1 User Manual
V1.9 - 23rd Aug 2016
3.4.1 200MHz Reference Clock (REFCLK200M)
The fixed 200MHz reference clock REFCLK200M is a differential clock signal using LVDS. This signal is widely
distributed throughout the board.
It is connected to a MRCC inputs on the Target FPGA on Bank 14.
REFCLK200M is also converted to HSTL signaling and used as the input clock for the DRAM interface.
This clock can be used to generate application-specific clock frequencies using the PLLs within the Virtex-7
FPGA. It is also suitable as the reference clock for the IO delay control block (IDELAYCTRL).
Signal
Frequency
Target FPGA Input
IO Standard
"P" pin
"N" pin
REFCLK200M
200 MHz
IO_L12_T2_MRCC_14 LVDS
AK34
AL34
REFCLK200M_HSTL 200 MHz
IO_L12_T1_MRCC_19 HSTL_I
L39
L40
REFCLK200M_HSTL 200 MHz
IO_L12_T1_MRCC_35 HSTL_I
E34
E35
REFCLK200M_HSTL 200 MHz
IO_L12_T1_MRCC_37 HSTL_I
D27
D28
REFCLK200M_HSTL 200 MHz
IO_L12_T1_MRCC_39 HSTL_I
H15
H14
REFCLK200M
200 MHz
MGTREFCLK0_115
LVDS
Y8
Y7
REFCLK200M
200 MHz
MGTREFCLK0_118
LVDS
G10
G9
Table 4 : REFCLK200M Connections
3.4.2 PCIe Reference Clock 0 (PCIEREFCLK0)
The 100MHz PCI Express reference clock is provided by the carrier card through the Primary XMC connector,
P5 at pins A19 and B19. This clock is buffered into two PLE Express reference clocks that are forwarded to the
Bridge and User FPGA respectively.
Signal
Frequency
Target FPGA Input
IO Standard
"P" pin
"N" pin
PCIEREFCLK
100 MHz
MGTREFCLK0_117
LVDS
K8
K7
Table 5 : PCIEREFCLK Connections
3.4.3 PCIe Reference Clock 1 (PCIEREFCLK1)
The reference clock "PCIEREFCLK1" is a differential clock provided by a carrier card through the Secondary
XMC connector P6 at pins A19 and B19. The Default build configuration for this board connects this pair to the
MGT signal inputs. Most needed reference clocks can be generated through the User Programmable clocking
options. If it is a requirement that this differential pair be utilized as a clock signal to an MGT bank, a resistor fit
option is available. Please contact Alpha Data for detials.
Page 10
Functional Description
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