PageLength_Ln Parameter
MultiCam parameter PageLength_Ln specifies the number of lines to acquire in a single surface.
The MultiCam user has to specify the page length according to:
- User application requirements
- Functional limits of MultiCam and Hardware implementations
In addition, following recommendations to select the optimal values should be taken into account.
Rule 1
Current hardware implementations limit PageLength_Ln to a 16-bit value.
PageLength_Ln < 65536
Rule 2
The maximum surface transition rate should not exceed 1 kHz.
With MaximumLineAcquisitionRate being the highest line acquisition rate of the application expressed in Hertz:
Rule 3
In order to reach large SeqLength_Ln above 65535, it is required to select a PageLength_Ln that satisfies this rule:
Recommendation
For optimal usage of the on-board buffer, the amount of data in a single surface should be in the range 1..4 Mbytes.
Therefore:
This recommendation becomes significant only when the average data rate on the PCI interface is approaching the board limits. Namely:
- 90 Mbyte/s on Grablink Value
- 240 Mbytes/s on Grablink Expert 2 and Grablink Quickpack ColorScan