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Description of the data path
Transfer mode
Encapsulated Update (begin/
end)
Parameter-List Update
Standard Update (IIDC)
How to transfer parameters to the camera
The following 3 variants of transferring the parameters are available with the
firmware 3.x:
☺
Advantage
☺ easy to use (standard quad
writes in camera register is
possible)
☺ only one write access for all
parameters
☺ fastest host camera transfer
(from 5 parameters on faster
than encapsulated mode)
☺ handling of parameter list
easy
☺ compliant with IIDC V1.31
Table 42: Comparison of 3 transfer modes
In the following you find a short description of each variant:
Encapsulated Update (begin/end)
The Encapsulated Update (begin/end) has the following characteristics:
•
Host will set a parameter update begin flag in the camera (UpdActive
Field in Register 0xF1000570, see
timing modes
on page 294)
•
Host will send several parameters to the camera and then signalize end
by resetting the flag
•
All parameters will become active for the same next image
•
Dependent on timing mode, the camera
– (standard Update): uses the previous parameters until the update
flag (UpdActive Field in Register 0xF1000570) is reset
– (Quick Format Change Mode): Camera stops and waits until the
update flag (UpdActive Field in Register 0xF1000570) is reset.
In the Encapsulated Update (begin/end) the exact sequence is:
1. Parameter update begin (advanced feature register)
2. Standard IIDC register update (1..N register) (standard feature register)
3. Parameter update end (advanced feature register)
Disadvantage
one write access per register
access
not so easy to use (block
writes)
max. 64 entries for parameter
list
non deterministic change of
parameters
Table 148: Advanced register: Update
PIKE Technical Manual V4.1.0
137
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