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1. About the Video and Vision Processing Suite
2. Getting Started with the Video and Vision Processing IPs
3. Video and Vision Processing IPs Functional Description
4. Video and Vision Processing IP Interfaces
5. Video and Vision Processing IP Registers
6. Video and Vision Processing IPs Software Programming Model
7. Protocol Converter Intel® FPGA IP
8. 3D LUT Intel® FPGA IP
9. AXI-Stream Broadcaster Intel® FPGA IP
10. Chroma Key Intel® FPGA IP
11. Chroma Resampler Intel® FPGA IP
12. Clipper Intel® FPGA IP
13. Clocked Video Input Intel® FPGA IP
14. Clocked Video to Full-Raster Converter Intel® FPGA IP
15. Clocked Video Output Intel® FPGA IP
16. Color Space Converter Intel® FPGA IP
17. Deinterlacer Intel® FPGA IP
18. FIR Filter Intel® FPGA IP
19. Frame Cleaner Intel® FPGA IP
20. Full-Raster to Clocked Video Converter Intel® FPGA IP
21. Full-Raster to Streaming Converter Intel® FPGA IP
22. Genlock Controller Intel® FPGA IP
23. Generic Crosspoint Intel® FPGA IP
24. Genlock Signal Router Intel® FPGA IP
25. Guard Bands Intel® FPGA IP
26. Interlacer Intel® FPGA IP
27. Mixer Intel® FPGA IP
28. Pixels in Parallel Converter Intel® FPGA IP
29. Scaler Intel® FPGA IP
30. Stream Cleaner Intel® FPGA IP
31. Switch Intel® FPGA IP
32. Tone Mapping Operator Intel® FPGA IP
33. Test Pattern Generator Intel® FPGA IP
34. Video Frame Buffer Intel® FPGA IP
35. Video Streaming FIFO Intel® FPGA IP
36. Video Timing Generator Intel® FPGA IP
37. Warp Intel® FPGA IP
38. Design Security
39. Document Revision History for Video and Vision Processing Suite User Guide
22.4.1. Achieving Genlock Controller Free Running (for Initialization or from Lock to Reference Clock N)
22.4.2. Locking to Reference Clock N (from Genlock Controller IP free running)
22.4.3. Setting the VCXO hold over
22.4.4. Restarting the Genlock Controller IP
22.4.5. Locking to Reference Clock N New (from Locking to Reference Clock N Old)
22.4.6. Changing to Reference Clock or VCXO Base Frequencies (switch between p50 and p59.94 video formats and vice-versa)
22.4.7. Disturbing a Reference Clock (a cable pull)
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22.4.2. Locking to Reference Clock N (from Genlock Controller IP free running)
Locking to an external reference clock involves various bits within the same register. You require multiple writes to control the behavior in the correct sequence and to also ensure that any transition pulses are wide enough.
- Always disable the PFD (in case the IP previously uses them):
- Disable LPF
- Write LPF Control 1 Register = 0x0
- Write LPF Control 3 Register = 0x0
- Disable PFD
- Write PFD Control Register = 0x0
- Write TxRx VCXO Clock Ratio Register = 0x0
- Write TxRx Reference Clock Ratio Registers = 0x0
- Disable LPF
- Setup and enable the LPF, which you can do as the PFD is still disabled that feeds the LPF:
- Initialize LPF. In this Phase Mode example, the Integrator reset value = 0, P and I gain are 3.0 and 1.0 respectively. D is not used, nor is negative gain or I fraction gain mode. Lock status is Phase mode and shift the LSB position by 1 (for checking lock). Also reset DAC Saturation bit, in case it is set (bit 29, which you need to clear).
- Write LPF Control 2 Register = 0x0
- Write LPF Control 1 Register = 0x600d0000
- Write LPF Control 3 Register = 0x000301
- Initialize LPF. In this Phase Mode example, the Integrator reset value = 0, P and I gain are 3.0 and 1.0 respectively. D is not used, nor is negative gain or I fraction gain mode. Lock status is Phase mode and shift the LSB position by 1 (for checking lock). Also reset DAC Saturation bit, in case it is set (bit 29, which you need to clear).
- Perform the enable as an extra step (maintain all the other bits, except bit 29, which you should return to ‘0’):
- Enable the LPF
- Read modify write bit 0 LPF control 1 register = 0x400d0001
- Enable the LPF
- Setup and enable the PFD by setting the output update period MSBs, the choice of reference clock, its rate, and place the reference clock and VCXO clock in reset in one operation:
- Initialize the PFD. In this example, set 10 bits. Set the 10 LSBs to ‘1’ and the upper 6 MSBs to ‘0’. The 16 MSBs multiply the build time value by 1024.
- Write bits 31:16 PFD Control Register = 0x03ff
- In this example choose Ref0 and VCXO clock ratios to be 1:1. They both have theoretically the same frequency value:
- Write TxRx VCXO clock ratio register = 0x04000000
- Write TxRx reference clock ratio registers = 0x04000000
- Initialize the PFD (reset reference and VCXO clock counters)
- Write bits 7:4 for the selected clock counter (bit 4 in our example) and bit 12 for VCXO clock counter PFD control register (Reg 0) = 1
- Initialize the PFD. In this example, set 10 bits. Set the 10 LSBs to ‘1’ and the upper 6 MSBs to ‘0’. The 16 MSBs multiply the build time value by 1024.
- Take the internal clock counters out of reset:
- Read modify write bits 7:4 for the selected clock counter (bit 4 in the example) and bit 12 for VCXO clock counter PFD control register (Reg 0) = 0.
- Enable the PFD:
Read modify write bit 0 PFD control register (Reg 0) = 0x1
- Write the LPF value to drive DAC:
- Write DAC control register (Reg 5) = 0x3