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Chapter 1: XM104
9. Clocking Circuits
Two programmable clock circuits are provided on the XM104:
?
?
Silicon Labs Si570
Silicon Labs Si5368
A Silicon Labs Si570 serial IIC bus re-programmable clock source provides a low-jitter
clock with a user-programmable output frequency from 10 to 810 MHz. The Si570 is
located at IIC address 0x5D. The Si570 clock output (shown in Figure 1-2, page 10 ) is wired
to a NB6L11 clock driver integrated circuit. One differential output of the NB6L11 clock
driver is AC coupled, with 0.1 uF capacitors, and wired to the FMC HPC connector signal
GBTCLK1_M2C. The second output of the NB6L11 clock driver is connected one of the
Si5368 differential clock inputs. The default clock frequency is 156.25 MHz. Connections to
the FMC HPC connector are defined in Table 1-11 .
Table 1-11:
Si570 Clock Source Routed to XM104 FMC HPC J1 Connector
FMC HPC Connector J1
Pin
B20
B21
Signal Name
GBTCLK1_M2C_P (1)
GBTCLK1_M2C_N (1)
Source
Si570
Si570
Notes:
1. Signals are AC coupled using 0.1 uF series capacitors
The component installed on the XM104 is factory programmed with parameters in
Table 1-12 .
Table 1-12:
Characteristics of Si570 Component
Si570 Characteristic
Output Format
Output Enable Polarity
Temperature Stability
Frequency Range
Six-Digit Startup Frequency
Power Supply
IIC Address
XM104
LVDS
High
50 ppm
10–810 MHz
156.250 MHz
3.3V
x5D
For additional information on this component, including reprogramming the clock
frequency through the IIC serial bus interface, consult the manufacturer's data sheet at:
www.silabs.com .
18
www.xilinx.com
FMC XM104 Connectivity Card User Guide
UG536 (v1.1) September 24, 2010
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