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Video Display Registers
4.12.11 Video Display Field 2 Image Offset Register (VDIMGOFF2)
The video display field 2 image offset register (VDIMGOFF2) defines the field 2 image offset and specifies the starting location of the displayed image relative to the start of the active display.
The image line counter (ILCOUNT) is reset to 1 on the first image line (when FLCOUNT = VBLNKYSTOP2 + IMGVOFF2). If the NV bit is set, ILCOUNT is reset to 1 when FLCOUNT = VBLNKYSTOP2 - IMGVOFF2. Display image pixels are output in field 2 beginning on the line where ILCOUNT = 1. The default output values or blanking values are output during active lines prior to ILCOUNT = 1. For a negative offset, IMGVOFF2 must not be greater than VBLNKYSTOP2. The field 2 active image must not overlap the field 2 active image.
The image pixel counter (IPCOUNT) is reset to 0 at the start of an active line image. Once ILCOUNT = 1, image pixels from the FIFO are output on each line in field 2 beginning when FPCOUNT = IMGHOFF2. If the NH bit is set, IPCOUNT is reset when FPCOUNT = FRMWIDTH - IMGHOFF2. The default output values or blanking values are output during active pixels prior to IMGHOFF2.
The video display field 2 image offset register (VDIMGOFF2) is shown in Figure
Figure 4-41. Video Display Field 2 Image Offset Register (VDIMGOFF2)
31 | 30 | 28 | 27 | 16 |
NV |
| Reserved |
| IMGVOFF2 |
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| |||
15 | 14 | 12 | 11 | 0 |
NH |
| Reserved |
| IMGHOFF2 |
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LEGEND: R/W = Read/Write; R = Read only;
Table
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| Description | |
Bit | field (1) | symval (1) | Value | BT.656 and Y/C Mode | Raw Data Mode |
31 | NV | OF(value) |
| Negative vertical image offset enable bit. |
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| DEFAULT | 0 |
| Not used. |
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| NONE |
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| NEGOFF | 1 | Display image window begins before the | Not used. |
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| first active line of field 2. (Used for VBI |
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| data output.) |
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Reserved | - | 0 | Reserved. The reserved bit location is always read as 0. A value written to this field | ||
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| has no effect. |
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IMGVOFF2 | OF(value) | Specifies the display image vertical offset in lines from the first active line of field 2. | |||
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| DEFAULT | 0 |
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15 | NH | OF(value) |
| Negative horizontal image offset. |
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| DEFAULT | 0 |
| Not used. |
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| NONE |
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| NEGOFF | 1 | Display image window begins before the | Not used. |
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| start of active video. (Used for HANC |
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| data output.) |
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Reserved | - | 0 | Reserved. The reserved bit location is always read as 0. A value written to this field | ||
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| has no effect. |
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OF(value) | ||
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| offset in pixels from the start of each line |
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| of active video in field 2. This must be an |
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| even number (the LSB is treated as 0). |
| DEFAULT | 0 |
Specifies the display image horizontal offset in pixels from the start of each line of active video in field 2.
(1)For CSL implementation, use the notation VP_VDIMGOFF2_field_symval
134 | Video Display Port | SPRUEM1 |
