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ADE3800SXL Arkusz danych(PDF) 36 Page - STMicroelectronics |
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ADE3800SXL Arkusz danych(HTML) 36 Page - STMicroelectronics |
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36 / 138 page  Register Description by Block ADE3800 36/138 4.7 Input Sync Measurement (SMEAS) The SMEAS block monitors input activity and measures input sync signals from all sources. All unused and reserved bits return as zero. SMEAS operates in the crystal clock (xclk) domain. Input Sync Functions: ● Activity Detection: detects input activity ● Measurement: measures sync period and width 4.7.1 Input Sync - Activity Detection The activity block measures all sync sources in parallel. An active channel is defined as having a programmable number of rising edges within a programmable number of xclk cycles (= sample period). Activity limits are set per channel class: clkdiv1k and HSync; vsync. The activity results are updated each sample period. Software can select either: ● One shot: one time measurement ● Free Run: continuously running measurements Figure 7: VSync Up/Down Counter Composite Sync H Pulse V Pulse 1/8 1/4 3/4 7/8 Threshold UP UP DOWN DOWN OK: good if V Pulse width was too short for the chosen threshold (counter reaches 3/4th but goes down before 7/8th is reached): Bad sync bit SRT_VS_SEL[3] would be set threshold Extracted VSync up at 7/8 down at 1/8 BAD SYNC AREA 0 error |
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