Dalsa Piranha 3 Series, Руководство пользователя, Страница: 72 / 91

Piranha 3 User Manual
03-032-10216-06 Teledyne DALSA
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Video Data
The Channel Link technology is integral to the transm ission of vid eo d ata. Im age d ata and
im age enable signals are transm itted on the Channel Link bu s. Fou r enable signals are
d efined as:
• FVAL—Frame Valid (FVAL) is defined HIGH for valid lines.
• LVAL—Line Valid (LVAL) is defined HIGH for valid pixels.
• DVAL—Data Valid (DVAL) is defined HIGH when data is valid.
• Spare— A spare has been defined for future use.
All fou r enable signals m u st be p rovid ed by the cam era on each Channel Link chip . All
u nu sed d ata bits m u st be tied to a know n valu e b y the cam era. For m ore inform ation on
im age d ata bit allocations, refer to the official Cam era Link sp ecification on the Web site,
available here .
Camera Control Signals
Fou r LVDS p airs are reserved for general-p u rp ose cam era control. They are d efined as
cam era inp u ts and fram e grabber ou tp u ts. Cam era m anu factu rers can d efine these signals
to m eet their need s for a p articu lar p rod u ct. The signals are:
• Camera Control 1 (CC1)
• Camera Control 2 (CC2)
• Camera Control 3 (CC3)
• Camera Control 4 (CC4)
The Piranha 3 u ses the follow ing cam era control signals:
Table 15: Camera Control Configuration
C1 EXSYN C, negative ed ge active
CC2 PRIN
CC3 N ot Used
CC4 N ot Used
Communication
Tw o LVDS p airs have been allocated for asynchronou s serial com m u nication to and from
the cam era and fram e grabber. Cam eras and fram e grabbers shou ld s u p p ort at least 9600
bau d . These signals are
• SerTFG—Differential pair with serial communications to the frame grabber.
• SerTC—Differential pair with serial communications to the camera.
The serial interface w ill have the follow ing characteristics: one s tart bit, one stop bit, no
p arity, and no hand shaking. It is recom m end ed that fram e grabber m anu factu rers su p p ly
both a u ser interface and a softw are ap p lication p rogram m m ing interface (API) for u sing
the asynchronou s serial com m u nication p ort. The u ser in terface w ill consist of a term inal
p rogram w ith m inim al cap abilities of send ing and receiving a character string and
send ing a file of bytes. The softw are API w ill p rovid e fu nctions to enu m erate board s and
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