Cirrus-logic AN269 Manual de usuario descargar pdf (Pagina 54)

54 AN269REV1

AN269

HActiveStop = HBlankStop

HActiveStop = 22

Since no clock gating is required, the HClkStart should be set to HClkTotal and HClkStop should be set to HClkStop

to HClkTotal + 1

HClkStart = HClkTotal

HClkStart = 799

HClkStart = HClkTotal + 1

HClkStop = 800

Now, the vertical timing register settings can be determined. Using the equations from “Vertical Alignment Signals”

on page 22, the following values are obtained:

VLinesTotal = tVERT – 1

VLinesTotal = 525 - 1 = 524

VSyncStart = VLinesTotal

VSyncStart = 524

VSyncStop = VLinesTotal – tVSYNC

VSyncStop = 524 - 2 = 522

VBlankStart = VLinesTotal - tVSYNC - tVBACKPORCH

VBlankStart = 524 - 2 - 33 = 489

VBlankStop = tVFRONTPORCH - 1

VBlankStop = 9

VActiveStart = VBlankStart

VActiveStart = 489

VActiveStop = VBlankStop

VActiveStop = 9

Again, no clock gating is required, so we can set VClkStart to VLinesTotal and VClkStop to VLinesTotal+1:

VClkStart = VLinesTotal = 524

VClkStop = VLinesTotal + 1 = 525

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Cirrus-logic AN269 Manual de usuario Pagina 54