20
TR10a-LPQ User Manual
December
10,
2018
Figure 2-13 Clock circuit of the FPGA Board
A clock buffer is used to duplicate the 50 MHz oscillator, so there are six 50MHz clocks
fed into different five FPGA banks. The two programming clock generators are low-jitter
oscillators which are used to provide special and high quality clock signals for high-
speed transceivers and high bandwidth memory. Through I2C serial interface, the clock
generator controllers in the Arria 10 GX FPGA can be used to program the Si5340A and
Si5340B to generate 40G Ethernet QSFP+ and high bandwidth memory reference
clocks respectively.
lists the clock source, signal names, default frequency and their
corresponding Arria 10 GX device pin numbers.
Table 2-7 Clock Source, Signal Name, Default Frequency, Pin Assignments and
Functions
Source
Schematic
Signal Name
Default
Frequency
I/O
Standard
Arria 10 GX
Pin
Number
Application
U38
CLK_50_B2H
50.0 MHz
1.8V
PIN_AP34 User Application
CLK_50_B2I
1.8V
PIN_C30 User Application
CLK_50_B2J
1.8V
PIN_W36 User Application
CLK_50_B3C
1.8V
PIN_AK12 User Application
CLK_50_B3D
1.8V
PIN_AJ11 User Application
Y6
CLK_100_B2J
100.0MHz
1.8V
PIN_AC32 User Application
Y2
OSC_100_CLKUSR 100.0MHz
1.8V
PIN_AV26
User-supplied