PCVisionplus
Hardware Reference
Registers
3–45
Rev 02; February 8, 2002
3.4.7.2 DAC Chip Select (DACCS) R/W
This bit enables programming the DAC registers. Refer to “DAC Programming” in Chapter 4 for details.
DACCS
Function
0
DAC in program mode
1
DAC in normal operation mode
3.4.7.3 Timing Mode Select (TIMEMD) R/W
These three bits define the timing mode to be external timing (PLL), Internal (XTAL), or Variable Scan (VSCAN).
These bits also define the sync inputs used, and the pixel clock source. The TIMEMD bits define the timing input to
the PWG; either the PTG Hsync and Vsync in XTAL mode, or the stripped sync or separate sync inputs in PLL mode.
In XTAL mode the sync output drivers are enabled to drive the PTG sync outputs to a camera. Make sure the cables
are connected properly prior to setting a channel in XTAL mode. CAM0 and CAM1 have separate CLK and Frame
Reset pins. If VSCLKSEL=0, the clock is input on the CLKIN0 and CLKIN1 pins. If VSCLKSEL=1, the clock is
input on the FRESET0 and FRESET1 pins.
TIMEMD
Function
0
PLL Mode 0: sync stripper on camera selected by VIDEOINSEL; strip H, V, and Field from
composite video
1
PLL Mode 1: CAM0 separate H & V sync inputs,
FLDSEL selects field
2
PLL Mode 2: CAM1 separate H & V sync inputs,
FLDSEL selects field
3
Reserved
4
XTAL Mode: Internal PTG created H, V, and Field
5
VSCAN Mode 0: CAM0 timing inputs
6
VSCAN Mode 1: CAM1 timing inputs
7
Reserved
3.4.7.4 Low-Pass Filter Select (LPFSEL) R/W
The LPFSEL bit selects the low pass filter. Two filters are available; there is no bypass.
LPFSEL
Function
0
6.5 MHz low-pass filter
1
12.5 MHz low-pass filter
3.4.7.5 Video Input Select (VIDEOINSEL) R/W
The VIDEOINSEL bit selects between CAM0 and CAM1 input.
VIDEOINSEL
Function
0
CAM0 selected
1
CAM1 selected
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