1. A input clock or crystal should be valid before you write a new configuration (register map) to the RAM of Si5338
2. Writing new values to the IC should follow read-modify-write process via write-allowed mask. Here is AN428 and source code about programming.
https://www.silabs.com/documents/public/application-notes/AN428.pdf

https://www.silabs.com/documents/public/software/AN428SW.zip

3. I2C timing: 

Hold Time START Condition tHD:STA should bigger than 4us for standard mode and 0.6us for fast mode.

Data Hold Time tHD:DAT should bigger than 100ns for standard mode fast mode.

4. If you simulate I2C via FPGA,  please configure SDA to inout. Set SDA as output when write data, and Set SDA as input when ACK send to FPGA.

If you’re not able to communicate to your module, neither over the serial interface nor over the network, possibly due to installing the wrong update file. It requires that you use the Commander program, that you can connect to the module’s serial port and that you have access to the module’s reset or can power cycle the device. 

Please be noted that keep serial connection when you power cycle or reset the device. If your device/system are powered by USB that is also a serial port, you cannot plug out/plug in USB cable to power cycle the device. Because the serial connection will also be disconnected when you plug out/plug in USB cable. Please separate Serial port and power supply or use a reset signal for this case. 

Hi Jenna,

Is the issue fixed?

There is a crystal mounted in EVB, so you don't need apply a clock to XA/XB SMA connector. But if the crystal was removed, please apply a clock to XA/XB SMA connector and modify the EVB according to description in User Guide.

Thanks.

Yong

Hi Michael,

Thanks for questions, you have dive into it deeply. No other fast methods.

Do you need zero delay mode? If yes, the Si5342/44/45 series has an additional zero delay mode so the input to output skew would be low upon power up/reset/ICAL as well as when locked up. 

Thanks.

Yong

Sorry for reply later.

Was input signal ready when you program the Si5338?

Thanks.

Yong

Hi Hua,

Was the issue fixed?

Thanks.

Yong

Hi

Just post feedback here from SF

ns of propagation delay is a  typo. It's picosecond as unit.
We will update this in datasheet later. 

Thanks.

Hi

Just post feedback here from SF

ns of propagation delay is a  typo. It's picosecond as unit.
We will update this in datasheet later. 

Thanks.

Hi Doug,

For Si5351A, 132.8356 Hz is not valid. The output must be 2.5kHz to 200MHz.

Thanks.

Yong

It works normally when connect PIN.6 (SSEN) to ground. 

Thanks.