ADM-XRC-9R1 User Manual
V1.7 - 16th Sept 2020
3.4.3 PN6 Reference Clock (PN6_PCIEREFCLK)
The reference clock "PN6_PCIEREFCLK" is a differential clock provided by a carrier card through the Secondary
XMC connector P6 at pins A19 and B19. This board connects this pair to an MGT clock input.
Signal
Frequency
FPGA Input
IO Standard
"P" pin
"N" pin
PN6_PCIEREFCLK
100 MHz
MGTREFCLK1_129
LVDS
F28
F29
Table 7 : PN6_PCIEREFCLK Connections
3.4.4 Programmable Clocks (PROGCLK 0-2)
There is one programmable clock source that is forwarded throughout the FPGA. This clock is programmable
through the USB system monitor. PROGCLK[2:0] is generated by a dedicated programmable clock generator IC
and offer extremely high frequency resolutions (1ppm increments). PROGCLK[2:0] are all buffered copies of the
same clock signal.
Signal
Frequency
Target FPGA Input
IO Standard
"P" pin
"N" pin
PROGCLK0
5 - 312.5 MHz
PS_MGTREFCLK1_505 LVDS
V29
V30
PROGCLK1
5 - 312.5 MHz
MGTREFCLK0_128
LVDS
M28
M29
PROGCLK2
5 - 312.5 MHz
IO_L8P_HDGC_89
LVDS
G11
G10
Table 8 : PROGCLK Connections
3.4.5 MGT Reference Clocks
The PS and PL MGTs can be clocked by sources from the P5, P6 or on-board clock sources
Zynq Ultrascale
MGT Banks
MGT129
REFCLK0
REFCLK1
MGT128
XMC
P5
XMC
P6
PCIe
REFCLK
Buffer
Programmable
Clock Source
REFCLK0
REFCLK1
MGT505
REFCLK2
REFCLK0
REFCLK1
Figure 5 : MGT Clocks
Page 11
Functional Description
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