LMX2820: lock-out issue

panhua.yang

Other Parts Discussed in Thread: LMX2820

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/1224373/lmx2820-lock-out-issue/4647385#4647385

hi noel

Can you provide a list of all the register values and order, I still return to a few after trying

Best Regards

over 1 year ago

0 Noel Fung over 1 year ago

TI__Guru* 85990 points

HI Panhua,

Please follow the procedure and use TICS Pro to generate the register values. Alternatively, please describe what you have programmed and the sequence in details, we will review.

0 panhua.yang over 1 year ago

Prodigy 31 points

                 REG122 = 24'h7A_0000,
                 REG121 = 24'h79_0000,
                 REG120 = 24'h78_0000,
                 REG119 = 24'h77_0000,
                 REG118 = 24'h76_0000,
                 REG117 = 24'h75_0000,
                 REG116 = 24'h74_0000,
                 REG115 = 24'h73_0000,
                 REG114 = 24'h72_0000,
                 REG113 = 24'h71_0000,
                 REG112 = 24'h70_FFFF,
                 REG111 = 24'h6F_0000,
                 REG110 = 24'h6E_001F,
                 REG109 = 24'h6D_0000,
                 REG108 = 24'h6C_0000,
                 REG107 = 24'h6B_0000,
                 REG106 = 24'h6A_0000,
                 REG105 = 24'h69_000A,
                 REG104 = 24'h68_0014,
                 REG103 = 24'h67_0014,
                 REG102 = 24'h66_0028,
                 REG101 = 24'h65_03E8,
                 REG100 = 24'h64_0533,
                 REG99  = 24'h63_19B9,
                 REG98  = 24'h62_1C80,
                 REG97  = 24'h61_0000,
                 REG96  = 24'h60_17F8,
                 REG95  = 24'h5F_0000,
                 REG94  = 24'h5E_0000,
                 REG93  = 24'h5D_1000,
                 REG92  = 24'h5C_0000,
                 REG91  = 24'h5B_0000,
                 REG90  = 24'h5A_0000,
                 REG89  = 24'h59_0000,
                 REG88  = 24'h58_03FF,
                 REG87  = 24'h57_FF00,
                 REG86  = 24'h56_0040,
                 REG85  = 24'h55_0000,
                 REG84  = 24'h54_0040,
                 REG83  = 24'h53_0F00,
                 REG82  = 24'h52_0000,
                 REG81  = 24'h51_0000,
                 REG80  = 24'h50_01C0,
                 REG79  = 24'h4F_001E,
                 REG78  = 24'h4E_0011,
                 REG77  = 24'h4D_0708,
                 REG76  = 24'h4C_0000,
                 REG75  = 24'h4B_0000,
                 REG74  = 24'h4A_0000,
                 REG73  = 24'h49_0000,
                 REG72  = 24'h48_0000,
                 REG71  = 24'h47_0000,
                 REG70  = 24'h46_00FE,
                 REG69  = 24'h45_0011,
                 REG68  = 24'h44_0020,
                 REG67  = 24'h43_1000,
                 REG66  = 24'h42_003F,
                 REG65  = 24'h41_0000,
                 REG64  = 24'h40_0080,
                 REG63  = 24'h3F_C350,
                 REG62  = 24'h3E_0000,
                 REG61  = 24'h3D_03E8,
                 REG60  = 24'h3C_01F4,
                 REG59  = 24'h3B_1388,
                 REG58  = 24'h3A_0000,
                 REG57  = 24'h39_0001,
                 REG56  = 24'h38_0001,
                 REG55  = 24'h37_0002,
                 REG54  = 24'h36_0000,
                 REG53  = 24'h35_0000,
                 REG52  = 24'h34_0000,
                 REG51  = 24'h33_203F,
                 REG50  = 24'h32_0080,
                 REG49  = 24'h31_0000,
                 REG48  = 24'h30_4180,
                 REG47  = 24'h2F_0300,
                 REG46  = 24'h2E_0300,
                 REG45  = 24'h2D_AAAB,
                 REG44  = 24'h2C_FD6A,
                 REG43  = 24'h2B_9500,
                 REG42  = 24'h2A_9101,
                 REG41  = 24'h29_0000,
                 REG40  = 24'h28_0000,
                 REG39  = 24'h27_0000,
                 REG38  = 24'h26_927C,
                 REG37  = 24'h25_0500,
                 REG36  = 24'h24_0016,
                 REG35  = 24'h23_3100,
                 REG34  = 24'h22_0010,
                 REG33  = 24'h21_0000,
                 REG32  = 24'h20_1001,
                 REG31  = 24'h1F_0401,
                 REG30  = 24'h1E_B18C,
                 REG29  = 24'h1D_318C,
                 REG28  = 24'h1C_0639,
                 REG27  = 24'h1B_8001,
                 REG26  = 24'h1A_0DB0,
                 REG25  = 24'h19_0624,
                 REG24  = 24'h18_0E34,
                 REG23  = 24'h17_1102,
                 REG22  = 24'h16_E2BF,
                 REG21  = 24'h15_1C64,
                 REG20  = 24'h14_272C,
                 REG19  = 24'h13_2120,
                 REG18  = 24'h12_0000,
                 REG17  = 24'h11_15C0,
                 REG16  = 24'h10_171C,
                 REG15  = 24'h0F_2001,
                 REG14  = 24'h0E_3001,
                 REG13  = 24'h0D_0038,
                 REG12  = 24'h0C_0408,
                 REG11  = 24'h0B_0612,
                 REG10  = 24'h0A_0000,
                 REG9   = 24'h09_0005,
                 REG8   = 24'h08_C802,
                 REG7   = 24'h07_0000,
                 REG6   = 24'h06_0A43,
                 REG5   = 24'h05_0032,
                 REG4   = 24'h04_4204,
                 REG3   = 24'h03_0041,  
                 REG2   = 24'h02_8266,
                 REG1   = 24'h01_57A3,
                 REG0   = 24'h00_4630,
                  //WIAT 100ms
                 REG0  =  24'h00_4620,

hi noel

Please check it。

Best Regards

0 Noel Fung over 1 year ago in reply to panhua.yang

TI__Guru* 85990 points

Hi Panhua,

This is the register set in Step 1, what are the register sets for the other Step?

0 panhua.yang over 1 year ago in reply to Noel Fung

Prodigy 31 points

hi noel

I only configured the following registers to complete the initialization, and there is a chance that the lock will fail after power-on. Do you mean to follow the following register Settings?
I've tried that and it's gone wrong.

   REG122 = 24'h7A_0000,
                 REG121 = 24'h79_0000,
                 REG120 = 24'h78_0000,
                 REG119 = 24'h77_0000,
                 REG118 = 24'h76_0000,
                 REG117 = 24'h75_0000,
                 REG116 = 24'h74_0000,
                 REG115 = 24'h73_0000,
                 REG114 = 24'h72_0000,
                 REG113 = 24'h71_0000,
                 REG112 = 24'h70_FFFF,
                 REG111 = 24'h6F_0000,
                 REG110 = 24'h6E_001F,
                 REG109 = 24'h6D_0000,
                 REG108 = 24'h6C_0000,
                 REG107 = 24'h6B_0000,
                 REG106 = 24'h6A_0000,
                 REG105 = 24'h69_000A,
                 REG104 = 24'h68_0014,
                 REG103 = 24'h67_0014,
                 REG102 = 24'h66_0028,
                 REG101 = 24'h65_03E8,
                 REG100 = 24'h64_0533,
                 REG99  = 24'h63_19B9,
                 REG98  = 24'h62_1C80,
                 REG97  = 24'h61_0000,
                 REG96  = 24'h60_17F8,
                 REG95  = 24'h5F_0000,
                 REG94  = 24'h5E_0000,
                 REG93  = 24'h5D_1000,
                 REG92  = 24'h5C_0000,
                 REG91  = 24'h5B_0000,
                 REG90  = 24'h5A_0000,
                 REG89  = 24'h59_0000,
                 REG88  = 24'h58_03FF,
                 REG87  = 24'h57_FF00,
                 REG86  = 24'h56_0040,
                 REG85  = 24'h55_0000,
                 REG84  = 24'h54_0040,
                 REG83  = 24'h53_0F00,
                 REG82  = 24'h52_0000,
                 REG81  = 24'h51_0000,
                 REG80  = 24'h50_01C0,
                 REG79  = 24'h4F_001E,
                 REG78  = 24'h4E_0011,
                 REG77  = 24'h4D_0708,
                 REG76  = 24'h4C_0000,
                 REG75  = 24'h4B_0000,
                 REG74  = 24'h4A_0000,
                 REG73  = 24'h49_0000,
                 REG72  = 24'h48_0000,
                 REG71  = 24'h47_0000,
                 REG70  = 24'h46_001E,
                 REG69  = 24'h45_0011,
                 REG68  = 24'h44_0020,
                 REG67  = 24'h43_1000,
                 REG66  = 24'h42_003F,
                 REG65  = 24'h41_0000,
                 REG64  = 24'h40_0080,
                 REG63  = 24'h3F_C350,
                 REG62  = 24'h3E_0000,
                 REG61  = 24'h3D_03E8,
                 REG60  = 24'h3C_01F4,
                 REG59  = 24'h3B_1388,
                 REG58  = 24'h3A_0000,
                 REG57  = 24'h39_0001,
                 REG56  = 24'h38_0001,
                 REG55  = 24'h37_0002,
                 REG54  = 24'h36_0000,
                 REG53  = 24'h35_0000,
                 REG52  = 24'h34_0000,
                 REG51  = 24'h33_203F,
                 REG50  = 24'h32_0080,
                 REG49  = 24'h31_0000,
                 REG48  = 24'h30_4180,
                 REG47  = 24'h2F_0300,
                 REG46  = 24'h2E_0300,
                 REG45  = 24'h2D_AAAB,
                 REG44  = 24'h2C_FD6A,
                 REG43  = 24'h2B_9500,
                 REG42  = 24'h2A_9101,
                 REG41  = 24'h29_0000,
                 REG40  = 24'h28_0000,
                 REG39  = 24'h27_0000,
                 REG38  = 24'h26_927C,
                 REG37  = 24'h25_0500,
                 REG36  = 24'h24_0016,
                 REG35  = 24'h23_3100,
                 REG34  = 24'h22_0010,
                 REG33  = 24'h21_0000,
                 REG32  = 24'h20_1001,
                 REG31  = 24'h1F_0401,
                 REG30  = 24'h1E_B18C,
                 REG29  = 24'h1D_318C,
                 REG28  = 24'h1C_0639,
                 REG27  = 24'h1B_8001,
                 REG26  = 24'h1A_0DB0,
                 REG25  = 24'h19_0624,
                 REG24  = 24'h18_0E34,
                 REG23  = 24'h17_1102,
                 REG22  = 24'h16_E2BF,
                 REG21  = 24'h15_1C64,
                 REG20  = 24'h14_272C,
                 REG19  = 24'h13_2120,
                 REG18  = 24'h12_0000,
                 REG17  = 24'h11_15C0,
                 REG16  = 24'h10_171C,
                 REG15  = 24'h0F_2001,
                 REG14  = 24'h0E_3001,
                 REG13  = 24'h0D_0038,
                 REG12  = 24'h0C_0408,
                 REG11  = 24'h0B_0612,
                 REG10  = 24'h0A_0000,
                 REG9   = 24'h09_0005,
                 REG8   = 24'h08_C802,
                 REG7   = 24'h07_0000,
                 REG6   = 24'h06_0A43,
                 REG5   = 24'h05_0032,
                 REG4   = 24'h04_4204,
                 REG3   = 24'h03_0041,  
                 REG2   = 24'h02_8266,
                 REG1   = 24'h01_57A0,
                 REG0   = 24'h00_4630,
                  //WIAT 100ms
                 REG0   = 24'h00_4620,
                 //WIAT 100ms
                 REG70  = 24'h46_00FE,
                 REG0   = 24'h00_4620,
                 REG1   = 24'h01_57A2,
                 REG2   = 24'h02_8266,
                 REG1   = 24'h01_57A3,
                 REG44  = 24'h2C_FD6A,
                 REG0   = 24'h00_4630,
                 //WIAT 100ms
                 REG0   = 24'h00_4620,

Best Regards

0 Noel Fung over 1 year ago in reply to panhua.yang

TI__Guru* 85990 points

Hi Panhua,

According to your register setting, you are using OUTB only. You have set PINMUTE_POL = active LOW. Unless you have the MUTE pin pull to HIGH, OUTB will be muted.

During initialization, R0[13] should be 1.(line 123, 125)

Second R0 programming (line 125), R0[4] should be 1.

Let me know if you can consistently get LMX2820 locked to 5650MHz after fixing the above register settings.

Your instant calibration sequence is not correct, if Step is succeeded, follow the programming sequence (Step 2 to 10).

0 panhua.yang 12 months ago

Prodigy 31 points

REG122 = 24'h7A_0000,
                 REG121 = 24'h79_0000,
                 REG120 = 24'h78_0000,
                 REG119 = 24'h77_0000,
                 REG118 = 24'h76_0000,
                 REG117 = 24'h75_0000,
                 REG116 = 24'h74_0000,
                 REG115 = 24'h73_0000,
                 REG114 = 24'h72_0000,
                 REG113 = 24'h71_0000,
                 REG112 = 24'h70_FFFF,
                 REG111 = 24'h6F_0000,
                 REG110 = 24'h6E_001F,
                 REG109 = 24'h6D_0000,
                 REG108 = 24'h6C_0000,
                 REG107 = 24'h6B_0000,
                 REG106 = 24'h6A_0000,
                 REG105 = 24'h69_000A,
                 REG104 = 24'h68_0014,
                 REG103 = 24'h67_0014,
                 REG102 = 24'h66_0028,
                 REG101 = 24'h65_03E8,
                 REG100 = 24'h64_0533,
                 REG99  = 24'h63_19B9,
                 REG98  = 24'h62_1C80,
                 REG97  = 24'h61_0000,
                 REG96  = 24'h60_17F8,
                 REG95  = 24'h5F_0000,
                 REG94  = 24'h5E_0000,
                 REG93  = 24'h5D_1000,
                 REG92  = 24'h5C_0000,
                 REG91  = 24'h5B_0000,
                 REG90  = 24'h5A_0000,
                 REG89  = 24'h59_0000,
                 REG88  = 24'h58_03FF,
                 REG87  = 24'h57_FF00,
                 REG86  = 24'h56_0040,
                 REG85  = 24'h55_0000,
                 REG84  = 24'h54_0040,
                 REG83  = 24'h53_0F00,
                 REG82  = 24'h52_0000,
                 REG81  = 24'h51_0000,
                 REG80  = 24'h50_01C0,
                 REG79  = 24'h4F_001E,
                 REG78  = 24'h4E_0011,
                 REG77  = 24'h4D_0608,
                 REG76  = 24'h4C_0000,
                 REG75  = 24'h4B_0000,
                 REG74  = 24'h4A_0000,
                 REG73  = 24'h49_0000,
                 REG72  = 24'h48_0000,
                 REG71  = 24'h47_0000,
                 REG70  = 24'h46_001E,
                 REG69  = 24'h45_0011,
                 REG68  = 24'h44_0020,
                 REG67  = 24'h43_1000,
                 REG66  = 24'h42_003F,
                 REG65  = 24'h41_0000,
                 REG64  = 24'h40_0080,
                 REG63  = 24'h3F_C350,
                 REG62  = 24'h3E_0000,
                 REG61  = 24'h3D_03E8,
                 REG60  = 24'h3C_01F4,
                 REG59  = 24'h3B_1388,
                 REG58  = 24'h3A_0000,
                 REG57  = 24'h39_0001,
                 REG56  = 24'h38_0001,
                 REG55  = 24'h37_0002,
                 REG54  = 24'h36_0000,
                 REG53  = 24'h35_0000,
                 REG52  = 24'h34_0000,
                 REG51  = 24'h33_203F,
                 REG50  = 24'h32_0080,
                 REG49  = 24'h31_0000,
                 REG48  = 24'h30_4180,
                 REG47  = 24'h2F_0300,
                 REG46  = 24'h2E_0300,
                 REG45  = 24'h2D_AAAB,
                 REG44  = 24'h2C_FD6A,
                 REG43  = 24'h2B_9500,
                 REG42  = 24'h2A_9101,
                 REG41  = 24'h29_0000,
                 REG40  = 24'h28_0000,
                 REG39  = 24'h27_0000,
                 REG38  = 24'h26_927C,
                 REG37  = 24'h25_0500,
                 REG36  = 24'h24_0016,
                 REG35  = 24'h23_3100,
                 REG34  = 24'h22_0010,
                 REG33  = 24'h21_0000,
                 REG32  = 24'h20_1001,
                 REG31  = 24'h1F_0401,
                 REG30  = 24'h1E_B18C,
                 REG29  = 24'h1D_318C,
                 REG28  = 24'h1C_0639,
                 REG27  = 24'h1B_8001,
                 REG26  = 24'h1A_0DB0,
                 REG25  = 24'h19_0624,
                 REG24  = 24'h18_0E34,
                 REG23  = 24'h17_1102,
                 REG22  = 24'h16_E2BF,
                 REG21  = 24'h15_1C64,
                 REG20  = 24'h14_272C,
                 REG19  = 24'h13_2120,
                 REG18  = 24'h12_0000,
                 REG17  = 24'h11_15C0,
                 REG16  = 24'h10_171C,
                 REG15  = 24'h0F_2001,
                 REG14  = 24'h0E_3001,
                 REG13  = 24'h0D_0038,
                 REG12  = 24'h0C_0408,
                 REG11  = 24'h0B_0612,
                 REG10  = 24'h0A_0000,
                 REG9   = 24'h09_0005,
                 REG8   = 24'h08_C802,
                 REG7   = 24'h07_0000,
                 REG6   = 24'h06_0A43,
                 REG5   = 24'h05_0032,
                 REG4   = 24'h04_4204,
                 REG3   = 24'h03_0041,  
                 REG2   = 24'h02_8266,
                 REG1   = 24'h01_57A0,
                 REG0   = 24'h00_6630,
                  //WIAT 100ms
                 REG0   = 24'h00_6630,
                 //WIAT 100ms
                 REG70  = 24'h46_00FE,
                 REG0   = 24'h00_4620,
                 REG1   = 24'h01_57A2,
                 REG2   = 24'h02_8266,
                 REG1   = 24'h01_57A3,
                 REG44  = 24'h2C_FD6A,
                 REG0   = 24'h00_4630,
                 //WIAT 100ms
                 REG0   = 24'h00_4620,

hi noel

Are these register configurations like this?

Best Regards

0 Noel Fung 12 months ago in reply to panhua.yang

TI__Guru* 85990 points

Hi Panhua,

Your initial register settings is correct, did you get it locked?

0 panhua.yang 11 months ago

Prodigy 31 points

hi noel

The lmx2820 can be locked.

Each time my operation is initialized after the power is off, so repeated many times or the phenomenon of loss of lock will appear as before, almost ten times once.

At present, I have not found the reason. If LMX2820 is not opened instant calibration， repeated operations will not cause loss of lock

Best Regards

0 Noel Fung 11 months ago in reply to panhua.yang

TI__Guru* 85990 points

Hi Panhua,

Let's focus on line 1 to line 125 first. Did you get 100% successful rate?

0 panhua.yang 11 months ago

Prodigy 31 points

Hi Noel

This has all been successful, I have tried it at least 50 times, and I have tried it on different hardware and the phenomenon is the same as before.

Best Regards

0 Noel Fung 11 months ago in reply to panhua.yang

TI__Guru* 85990 points

Hi Panhua,

OK, Step 1 is completed. Now move on to Step 2 to Step 10 (line 127 to 135).

REG70 = 24'h46_00FE,
REG0 = 24'h00_4620, ---> 4630
REG1 = 24'h01_57A2,
REG2 = 24'h02_8266, ---> can skip, initialization already programmed this value
REG1 = 24'h01_57A3,
REG44 = 24'h2C_FD6A, ---> can skip, initialization already programmed this value
REG0 = 24'h00_4630,
//WIAT 100ms
REG0 = 24'h00_4620,

Since this configuration has INSTCAL_DBLR_EN = 1, there is a chance that after Step 10, there is no output. In this case, reset the device and go through Step 1 to Step 10 again.

Clock & timing

Clock & timing forum

LMX2820: lock-out issue