PCVisionplus
Hardware Reference
Registers
3–47
Rev 02; February 8, 2002
3.4.7.11 Field Polarity Input Select (FLDPOL) R/W
The FLDPOL bit defines the polarity of the selected field output from the PWG (for interlaced images only) in
VSCAN mode and separate sync input PLL mode. The convention used here is, Field=0 is an Even field, and Field=1
is an Odd field. This FLDPOL bit allows compensation for other standards by inverting the field input. This bit
should be zero for XTAL mode and stripped sync PLL mode.
FLDPOL
Function
0
Field input low is Odd field or second field
1
Field input low is Even field or first field
3.4.7.12 Field Source Select (FLDSEL) R/W
The FLDSEL bit selects the field source in variable scan mode and in the separate sync input PLL modes. If the video
signal has composite sync, use the stripper to extract the field information. “Generated field” comes from comparing
the separate TTL sync inputs or LEN and FEN. The field is even (low) when Vsync/FEN occurs coincident with
Hsync/LEN, and odd (high) when Vsync/FEN occurs without Hsync/LEN (during the active video half line).
Vsync/FEN must be greater than two horizontal line times to use generated field mode.
FLDSEL
Function
0
Sync stripper field
1
Generated field
3.4.7.13 Field Shift Mode (FLDSHFT) R/W
This bit enables the PWG Field Shift mode, which allows cropping of the 1/2 lines output with some standard inter-
laced video formats (RS170 and CCIR). This mode is only available for either of the stripped sync PLL modes or
XTAL mode. Separate Sync PLL mode and VSCAN mode are not supported in Field Shift mode. This mode is not
used for non-interlaced video.
FLDSHFT PLL RS170
PLL CCIR
All XTAL Modes
0
Crop 1/2 line mode
Normal mode
Crop 1/2 line mode
1
Normal mode
Crop 1/2 line mode
Normal mode
3.4.7.14 Vertical Sync Output Enable (VSYNCEN) R/W
The VSYNCEN bit enables or disables the vertical sync output driver when XTAL mode is selected. This bit should
be disabled in PLL mode.
VSYNCEN
Function
0
VSYNC output disabled
1
VSYNC output enabled
3.4.7.15 Input Scan Mode Select (SMODE) R/W
The SMODE bit selects interlaced or non-interlaced camera input mode. This bit flags the image memory address
controller for the video format.
SMODE
Function
0
Interlaced video format
1
Non-interlaced video format
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