7
CAMELIA 4M Digital Camera
5301C–IMAGE–03/04
Digital I/O
Note:
1. LVDS (Low Voltage Differential Signal) is an EI- 644 standard.
LVDS drivers/receivers:
•
LVDS: all digital I/Os are differential: (, signal-). Specifications are given for
.
•
Manufacturer National Semiconductor
®
.
•
Driver: DS90C031TM (SO16 package)
•
Receiver: DS90C032TM (SO16 package).
Table 4. Digital I/O Specifications
Symbol
I/O
Definition
Level
TRIG_ITC
I
Timing control:
- TRIG_ITC is either an external trigger or ITC
(integration time control) depending on the timing
mode configured via RS-232.
Operation with external trigger:
- TRIG_ITC = TRIG
Operation with ITC:
- TRIG_ITC = ITC
- TRIG_ITC is synchronized by the camera line clock
(jitter: 112 µs)
LVDS
(1)
S(11..0)
O
Digital video output: 12 bits
LVDS
FEN
O
Frame enable:
- FEN = 0: frame data valid: active lines
- FEN = 1: frame data not valid
LVDS
LEN
O
Line enable:
- LEN = 0: line data valid: active pixels
- LEN = 1: line data not valid
LVDS
PCK
O
Pixel clock
LVDS
SHUTTER
O
Shutter open/close:
- during integration: SHUTTER = 1
- during readout: SHUTTER = 0
Delay between the falling edge of SHUTTER and the
start of readout:
- 4 positions: 1, 5, 10 or 20 ms (set via RS-232).
LVDS
COLOUR_I(1..0)
I
Color selection of the next frame (in color mode):
- 00: red
- 01: green
- 10: blue
LVDS
COLOUR_O(1..0)
O
Color identification of the current frame (in color mode):
- 00: red
- 01: green
- 10: blue.
LVDS
