Silicon Labs Si570 Clock Sources - Xilinx FMC XM101 LVDS QSE User Manual

Chapter 1: XM101

4. Silicon Labs Si570 Clock Sources

The Silicon Labs Si570 serial IIC bus programmable clock source provides a low-jitter clock
with a user-programmable output frequency from 10 to 810 MHz.
U1 and U2 Si570 are located at IIC address 0x5D and are accessed through the U4 PCA9543
IIC bus switch as described in
U1 and U2 Si570 components are factory programmed with parameters in
Table 1-11: Characteristics of Si570 Component
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.
The U1 and U2 Si570 output clocks to J1 FMC HPC connections are shown in
Table 1-12: Si570 to FMC HPC Connections
20
Si570 Characteristic
Output Format
Output Enable Polarity
Temperature Stability
Frequency Range
Six-Digit Startup Frequency
Power Supply
IIC Address
Si570
Net Name Pin Number
CLK0_M2C_P U1.4
CLK0_M2C_N U1.5
CLK2_M2C_P U2.4
CLK2_M2C_N U2.5
www.xilinx.com
3. PCA9543 IIC Bus Switch.
XM101
LVDS
High
50 ppm
10–810 MHz
156.250 MHz
3.3V
x5D
J1 FMC
Connector
Pin Number
H4
H5
K4
K5
Table 1-11.
Table 1-12.
FMC XM101 User Guide
UG538 (v1.1) September 24, 2010