MT9V125 Datasheet, PDF (26/68 Pages) ON Semiconductor – PAL CMOS Digital Image Sensor

MT9V125: SOC VGA Digital Image Sensor
Sensor Core Modes and Timing
Sensor Core Modes and Timing
This section provides an overview of usage modes for the MT9V125 sensor core. An over-
view of typical usage modes for the complete MT9V125 is provided in
“Modes and Timing” on page 33.
Readout Format
The sensor core supports two basic readout formats: interlaced and progressive. The
interlaced format supports both NTSC and PAL timing. Progressive readout is intended
for sensor stand-alone mode only (this is due to the paired Bayer pattern CFA).
Window Control
Window Start
Window Size
The window size and position need to be at the default settings for correct NTSC or PAL
format support.
The row and column start address of the displayed image can be set by R1:0 (row start)
and R2:0 (column start).
The default sensor resolution is 640 columns and 480 rows (VGA). For NTSC and PAL,
this is expanded by the horizontal interpolator module to 720 columns. For proper NTSC
or PAL operation, use only the default window size.
Pixel Border
When R32:0, Bits[9:8] are both set, a 4-pixel border will be added around the specified
image. When enabled, the row and column widths will be 8 pixels larger than the values
programmed in the row and column registers. If the border is enabled but not shown in
the image (R32:0[9:8] = 01), the horizontal blanking and vertical blanking values will be 8
pixels larger than the values programmed into the blanking registers. For proper NTSC
or PAL operation, use only default values in the above mentioned registers.
The border is read in an interlaced pattern when in interlaced readout mode. Each field
has its own interlaced border on top and bottom of the active array.
Sensor Core Readout Modes
Column Mirror Image
At reset, the HORIZ_FLIP input pin is latched into R30:1[1]. This bit is XORed with
register R21:1[1]. The result determines if horizontal flip is enabled (result = 1) or
disabled (result = 0). Figure 16 on page 27 illustrates the readout order of the columns
when they are reversed. The starting color is preserved when mirroring the columns.
Row Mirror Image
By setting R32:0[0] = 1, the readout order of the rows will be reversed, as shown in
Figure 17 on page 27. The starting color is preserved when mirroring the rows.
MT9V125_DS Rev.. W 6/15 EN
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