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MB86R02 'Jade-D' Hardware Manual V1.64
21.3.1
Signature A: CRC-32 Signature
Standard CRC-32 as in the Ethernet Standard (CRC-32-IEEE 802.3) is calculated for each color
channel in the evaluation window area.
The default polynome is:
32
26
23
22
16
x
+ x
+ x
+ x
+ x
Start value:
FFFF_FFFF
21.3.2
Signature B: Summation Signature
The sum of pixel color values for each color channel (R, G, B) in the evaluation window area is
calculated.
21.3.3
Programmable Evaluation Window (Position and Size)
Position and size of the evaluation window are programmable.
21.3.4
Programmable Evaluation Window Mask
A programmable mask window allows the exclusion of incoming pixels for the signature calculation.
21.3.5
Automatic Monitoring and Interrupt
A set of reference signature registers allows the monitoring of the calculated signatures. An interrupt
can be generated on the detection of a difference between the calculated signature and the reference
value. For signature B the difference can be threshold filtered to limit the interrupt load for the
microcontroller.
21.3.6
Self Restoring Error Counter
A counter is incremented if one of the active signature results differs from the corresponding reference
values. If a programmable error counter threshold is reached an interrupt may be generated The
same counter is reset to zero if a programmable number of consecutive video frames with correct
signature values is received.
21.3.7
Interrupts For Control Flow
An interrupt can be generated for both the start and end of a signature calculation. The start interrupt
(CfgCop) indicates that the configuration parameters (e.g. window coordinates) have been copied
from the shadow registers and are now active for the current signature calculation. This allows that
next configuration parameters can be loaded into the (shadow) registers without disturbing the current
calculation. The end interrupt (ResVal) indicates a signature calculation has completed and the result
data can be read from the result shadow registers. These interrupts help to control signature
calculations for every incoming frame with different evaluation window coordinates.
21.3.8
Programmable Input Picture Source
Input data can be selected from four different sources. Four different sources can be connected on
LSI top level.
12
11
10
8
+ x
+ x
+ x
+ x
+ x
7
5
4
2
+ x
+ x
+ x
+ x + 1
21-2
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