Si5338 on-the-fly configuration from Microblaze

[sa_fpga]

Dear Trenz Support,

we are currently working on a project with a TE0712-02-200-2I module. The reference design "test board" explains how to configure the Si5338 on start-up using a Microblaze_MCS.  We would like to configure the Si5338 CLK0 output frequency on-the-fly from a Microblaze processor (no linux). I looked also trough the forum, but did not find exactly what we are looking for. Could you please point me into right direction if there is already an existing example project configuring the Si5338 on-the-fly?

Best Regards

[JH]

Hi,
on test_board design it's done by MCU (the smaller microblaze), it's a simple baremetal programm which reprogram SI5338 over I2C --> all source code is included into the reference design.

Reference CLK of the bigger microblaze depends on SI5338 CLK, so you can't use this microblaze to reprogram whole SI5338. Either you connect another external reference CLK to the bigger microblaze or you must modify SI code in this way that not the whole SI5338 will be reprogrammed.

PS: Bigger Microblaze can also start barmetal app instead of uboot/linux. Our Linux is only a example which shows directly ETH functionality.

br
John

[sa_fpga]

Dear JH,

thank you for the quick reply.

"or you must modify SI code in this way that not the whole SI5338 will be reprogrammed" - thats exactly what I am looking for.

"Bigger Microblaze can also start barmetal app instead of uboot/linux." -  yes, that how we are using the Microblaze.

The aim is to have a reconfigurable clock source used as a pixel clock for different video resulotions.

Best Regards

[JH]

Hi,
we haven't C code to change only some outputs, but maybe you can reuse some of our C code.
Here are some additional notes and links to SI5338 Documentation from SILab this should help to create your own procedure.
br
John

[sa_fpga]

Dear John,

thanks for the answer.

Best Regards

[JH]

Hi, sorry I forgot the link:
https://wiki.trenz-electronic.de/display/PD/Si5338
br
John