Other Parts Discussed in Thread: LMK61E2
Dear Colleague,
We tried to change the default clock frequency to 200Mhz by writing to EEPROM of LMK61E2BBA (default frequency on 125Mhz). But, after the power cycle, I2C communication is broken and LMK61 did not produce any frequency.
The sequence of register programming before the LMK61E2 died is tabulated below.
Register NUM | New value | Comment |
21 | 02h | LVDS activation |
33 | 0Ch | Dither disabled, Interger mode |
34 | 28h | Integer mode -> charge pump 6.4mA |
36 | 04h | R2 = 500 Ohm |
38 | 00h | R3 = 18 Ohm |
37 | 00h | C1 = 5pF |
39 | 07h | C3 = 0pF |
35 | 07h | enable 2nd order loop filter (tool) |
27 | 00h | PLL_NUM = 0 |
28 | 00h | PLL_NUM = 0 |
29 | 00h | PLL_NUM = 0 |
30 | 00h | PLL_DEN = 1 |
31 | 00h | PLL_DEN = 1 |
32 | 01h | PLL_DEN = 1 |
Setting 200 Mhz clock | ||
72 | 02h | reset |
22 | 00h | |
23 | 1Ch | |
25 | 00h | |
26 | 38h | |
10 | 02h | calibrate (*after reset*) |
Now I tried to write this sequency to EEPROM of LMK61E2 | ||
56 | BEh | |
49 | 01h | (Note: instruction tells to change only R49.0) |
but I accidentally changed the whole register to 01 | ||
56 | 00h |