When capturing interlaced video the interrupt can be en-/disabled for each fieldseparately (first field, second field or both). In this case the currently captured fieldnumber, reflected in VInACTSCANLINE.AFDL, must match the field interruptenable additionally to the scanline number in order to assert the VOnSCLINTinterrupt.Following registers take part in the VOnSCLINT generation process:• Scanline interrupt control register VInSCANLINEINT:- SLINT[11:0]: unscaled scanline number for VOnSCLINTgeneration- FLD1EN or FLD2EN: enable (if 1) / disable (if 0) VInSCLINT forboth fieldsIn case of progressive video capturing VInSCANLINEINT.FLD2EN en-/disablesVInSCLINT.Active scanline register VInACTSCANLINE:- AFLD: first field (if 0) / second field (if 1) active- ACTSL[11:0]: active unscaled scanline numberThe scanline interrupt VOnSCLINT is activated under following conditions:• First field scanline interrupt- if VInACTSCANLINE.ACTSL[11:0] = VInSCANLINEINT.SLINT[11:0] > 0 and- VInSCANLINEINT.FLD1EN = 1 or VInSCANLINEINT.FLD2EN =1 and- VInACTSCANLINE.AFLD = 0• Second field scanline interrupt- if VInACTSCANLINE.ACTSL[11:0] = VInSCANLINEINT.SLINT[11:0] > 0 and- VInSCANLINEINT.FLD1EN = 1 or VInSCANLINEINT.FLD2EN =1 and- VInACTSCANLINE.AFLD = 1If ViSCANLINEINT.SLINT[11:0] = 0, no scanline interrupt is generated.In case of interlaced video capturing one VOnSCLINT is generated per field (if anyfor both fields is enabled by VInSCANLINEINT.FLD1EN = 1 orVInSCANLINEINT.FLD2EN = 1), thus two interrupts per frame.6.9.2 Interrupt controlControlling the Video Input module interrupts is done by means of the interruptcontrol registers of the Host CPU Interface.Chapter 6 Video Input (Ravin-M only)170 Preliminary User's Manual S19203EE1V3UM00
