Clock Generator 2 – U6, IDT 8T49N241-048NLGI on Ultrazed-ev board

Hi,

I changed the frequency of the output clocks in U6 on Ultrazed-ev development board using i2c interface in clock 2 test header.

Is it possible to reset the output clocks in U6 back to default?

Former Member 11 months ago

Here is what you are looking for. You will see a text file here that need to be programmed to the EEPROM.

https://github.com/Avnet/petalinux/tree/master/configs/meta-user/uz7ev_evcc_factest/recipes-apps/eeprom-test/files
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Jonathan101 11 months ago in reply to Former Member

Hi,

Do you or some of Avnet board have the updated .tcs file that is required by Renesas software 'timing ocmmander' to program the 8T49N241?

I wasn't able to program it using the .txt file from git
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bidrohini 11 months ago

If the clock configuration you modified was stored only in volatile memory (RAM), simply powering off the UltraZed-EV and then powering it back on will restore the default clock settings.
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iksevas 11 months ago in reply to Jonathan101

I'm not certain that you can use TIMING COMMANDER to physically program the EEPROM which is necessary to maintain the configuration. Suggestion is to use the TXT file from GITHUB and have the processor use I2C commands and program the TXT file to the EEPROM.
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Jonathan101 11 months ago in reply to iksevas

Can you elaborate on how to use the processor to do so?

You mean I should place xilinx i2c ip core on vivado and connect it to i2c_data and i2c_clk of the eeprom?
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iksevas 11 months ago in reply to Jonathan101

If you use the UltraZed-EV BSP, the I2C should already be available for you.

The clock generator U6 is programmed by the EEPROM U5. The CC_SCL/SDA signals are tied to the Carrier Card SOM connectors which maps to an I2C MUX on the SOM, U8. The I2C MUX is fed by the processor I2C interface using MIO24/25 (I2C1 interface).

The I2C MUX should be programmed to drive traffic to port 0 of the MUX (the CC_SCL/SDA port). You would potentially need some I2C transfers to set this to port 0 if it doesn't default there. The I2C address for this MUX is on the SOM schematic, 0xE0.

Once traffic is set to CC_SCL/SDA, then you need to write the text file data to the U5 EEPROM. The I2C address for the U5 EEPROM is on the Carrier Card schemtic, 0xA4.

The Avnet GITHUB has I2C EEPROM examples already. It could just be a matter of reviewing that code and substituting/modifying the code to support the transfer of the text file data.
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James123 11 months ago

Yes, you can reset the output clock of U6 to its default value. The 8T49N241 originally supports programming through the I2C interface.
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