LMK04000BEVAL/NOPB National Semiconductor, LMK04000BEVAL/NOPB Datasheet - Page 55

• Manufacturer Part Number: LMK04000BEVAL/NOPB
• Description: BOARD EVAL PRECISION CLOCK PLL
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMK04000BEVAL/NOPB

• Main Purpose: Timing, Clock Conditioner
• Embedded: No
• Utilized Ic / Part: LMK04000
• Primary Attributes: 122.88 MHz VCXO
• Secondary Attributes: Integrated PLL & VCO
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMK04000BEVAL; LMK04000BEVAL

Appendix J: Troubleshooting Information
If the evaluation board is not behaving as expected, the most likely issues are…
Refer to this checklist for a practical guide on identifying/exposing possible issues.
1) Confirm Communications
Refer to Appendix I: Properly Configuring LPT Port to trouble shoot this item.
Remember to load device with Ctrl-L!
2) Confirm PLL1 operation/locking
Naturally, the output frequency of the above two items, PLL 1 R Divider/2 and PLL 1 N Divider
/2, on LD pin should be the same frequency.
(continued on next page)
1) Board communication issue
2) Incorrect Programming of the device
3) Setup Error
1) Program PLL_MUX = “PLL 1 R Divider /2”
2) Confirm that LD pin output is half the expected phase detector frequency of PLL1.
3) Program PLL_MUX = “PLL 1 N Divider /2”
4) Confirm that LD pin output is half the expected phase detector frequency of PLL1.
5) Program PLL_MUX = “PLL1 DLD Active High”
6) Confirm the LD pin output is high.
i.
iii. If not, examine PLL1 register R programming.
iv. If not, examine physical CLKin input.
ii. If not, examine CLKin0_BUFTYPE / CLKin1_BUFTYPE.
ii. If not, examine physical OSCin input.
i. If not, examine CLKin_SEL programming.
i. If not, examine PLL1 register N programming.
L M K 0 4 0 X X - R E V 3
If high, then PLL1 is locked, continue to PLL2 operation/locking.
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