CDCE925: some pin cannot output the set frequency

Zhaoqi Chen

Part Number: CDCE925
Other Parts Discussed in Thread: CLOCKPRO

I am using 12.8Mhz as the clock input and hope that the output Y1 is 16.9344Mhz and Y5 is 27Mhz，but when using Ti clock pro for eeprom configuration, Y1 can output 16.9344, Y5 output is 12.8Mh, which is the input clock frequency.

This is my configuration information:

This is the code I burned into the eeprom:

unsigned char cdce_bin[] = {
  0x01, 0x08, 0xb4, 0x08, 0x02, 0x00, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6d, 0x02, 0x00, 0x00,
  0xf8, 0x11, 0xfa, 0xa5, 0xf8, 0x11, 0xfa, 0xa4, 0x00, 0x00, 0x00, 0x00,
  0x6d, 0x02, 0x00, 0x05, 0xfd, 0x21, 0x22, 0xa5, 0xfd, 0x21, 0x22, 0xa4
};
unsigned int cdce_bin_len = 48;

This is the actual measurement result:

7 months ago

0 Kadeem Samuel 6 months ago

TI__Genius 16640 points

Zhaoqi,

We are investigating this, and will be able to get back to you by Friday.
Thanks,
Kadeem

0 Cris Kobierowski 6 months ago in reply to Kadeem Samuel

TI__Expert 3615 points

Zhaoqi,

Are you using ClockPro to burn the eeprom, or a separate software?

Best,

Cris

0 Zhaoqi Chen 6 months ago in reply to Cris Kobierowski

Prodigy 10 points

Hello, I am using ClockPro to generate the hex configuration file. Use Linux to convert it into a .h data file, and use Arduino to write the data into eeprom.

I personally think that the eeprom has been modified successfully because the frequency of Y1 is programmable.

I followed this tutorial:

github.com/.../Arduino_CDCE913_Programmer

0 Zhaoqi Chen 6 months ago in reply to Kadeem Samuel

Prodigy 10 points

ok, thank you so much

0 Kadeem Samuel 6 months ago in reply to Zhaoqi Chen

TI__Genius 16640 points

Zhaoqi,

We have no issues programming this on our side with the evaluation module. Are you able to read back the device registers and compare the differences between what you burned and what is read back?

Thanks,

Kadeem

0 Zhaoqi Chen 6 months ago in reply to Kadeem Samuel

Prodigy 10 points

Kadeem,

This is the data in the eeprom that I read using arduino.

Zhaoqi

CDCE925_EEPROM.pdf CDCE925_EEPROM.xlsx

0 Kadeem Samuel 6 months ago in reply to Zhaoqi Chen

TI__Genius 16640 points

Zhaoqi,

Is the issue just limited to programming the EEPROM, or are you not seeing the clock be active when you write the registers as well prior to EEPROM programming?

The Arduino code appears to split the register writing by function rather than writing all of the bytes in the array - did you add a section for the PLL2 registers, or rewrite the code to handle this portion?
Thanks,

Kadeem

Clock & timing

Clock & timing forum

CDCE925: some pin cannot output the set frequency