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SAA7115 Datasheet(PDF) 52 Page - NXP Semiconductors |
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SAA7115 Datasheet(HTML) 52 Page - NXP Semiconductors |
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52 / 214 page  Confidential - NDA required page 52 Filename: SAA7115_Datasheet.fm Last edited by H. Lambers Philips Semiconductors CVIP2 Date: 10/23/01 CS-PD Hamburg Datasheet SAA7115 Version: 0.67 In ‘field mode’ the vertical trigger event gets higher priority than the vertical window definition. The processing is normally started at line number YO and ends at line number YS, but - if a vertical trigger occurs, before the line number YS is reached, the field processing is terminated and the next task is checked - if the actual line count at V-trigger is between the YO and the YS value, the task processing is started, also if the line number YO is missed. Continuous Mode (bit CMOD [80H[7]]) Applications, which do not use the vertical scaling, may take advantage from the ‘continuous processing mode’. In this mode a task is started via the SWRST bit and the task enable bits TEA or TEB. The horizontal window definition keeps it’s meaning, but YO and YS are ignored. The vertical blanking scheme is defined by the selected V-sync (see bits V_EAV). Once started, the vertical retrigger pulses from the input are ignored and SWRST at ‘0’ is needed to stop the task processing. Start, Repeat and Skip The start condition for the handler is defined by bits STRC[1:0] 90H[1:0] and means: start immediately, wait for next V-sync, next FID at logic 0 or next FID at logic 1. The FID is evaluated, if the vertical and horizontal offsets are reached. When RPTSK[90H[2]] is at logic 1 the actual running task is repeated (under the defined trigger conditions), before handing control over to the alternate task. To support field rate reduction, the handler is also enabled to skip fields (bits FSKP[2:0] 90H[5:3]) before executing the task. A TOGGLE flag is generated (used for the correct output field processing), which changes state at the beginning of a task, every time a task is activated. Examples are given in Section 8.3.1.3. Remarks: • To activate a task the start condition must be fulfilled and, in case of FMOD = 0, the acquisition window offsets must be reached. For example, in case of ‘start immediately’, and two regions are defined for one field, the offset of the lower region must be greater than (offset + length) the upper region, if not, the actual counted H and V position at the end of the upper task is beyond the programmed offsets and the processing will ‘wait for next V’. • Basically the trigger conditions are checked, when a task is activated. It is important to realize, that they are not checked while a task is inactive. So you can not trigger to next logic 0 or logic 1 with overlapping offset and active video ranges between the tasks (e.g. task A STRC[2:0] = 2, YO[11:0] = 310 and task B STRC[2:0] = 3, YO[11:0] = 310 results in output field rate of 50 ⁄ 3 Hz). • After power-on or software reset (via SWRST[88H[5]]) task B gets priority over task A. 8.3.1.3 Output field processing As a reference for the output field processing, two signals are available for the back-end hardware. These signals are the input field ID from the scaler source and a TOOGLE flag, which shows that an active task is used an odd (1, 3, 5...) or even (2, 4, 6...) number of times. Using a single or both tasks and reducing the field or frame rate with the task handling functionality, the TOGGLE information can be used, to reconstruct an interlaced scaled picture at a reduced frame rate. The TOGGLE flag isn’t synchronized to the input field detection, as it is only dependent on the interpretation of this information by the external hardware, whether the output of the scaler is processed correctly (see Section 8.3.3). With OFIDC = 0, the scalers input field ID is available as output field ID on bit D6 of SAV and EAV, respectively on pin IGP0 (IGP1), if FID output is selected. When OFIDC[90H[6]] = 1, the TOGGLE information is available as output field ID on bit D6 of SAV and EAV, respectively on pin IGP0 (IGP1), if FID output is selected. |
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