Manual
ibaFOB-io-ExpressCard
18 Issue
1.2
main constant. If this number starts increasing then something is wrong. This can
happen if e.g. an interrupt is missed.
Images copied to interrupt buffer
This counter shows how many images have been retrieved from the DMA buffer
and have been processed by ibaPDA. This counter should be constantly increas-
ing.
DMA buffer empty
This counter increments each time the DMA buffer is empty when the interrupt
fires. The driver will use the value 0 (zero) for all signals that are on this link when
this happens. This can happen if the FO link is disconnected.
Time between telegrams
The time between the last 2 correctly received telegrams
This is the same as the time in the FO communication information but the driver
maintains the minimum and maximum values. There shouldn’t be much differ-
ence between the minimum and maximum values.
Image sample rate
The rate at which the board writes images to the DMA buffer. This should be
faster than or equal to the fastest time base of the modules connected to this link.
Image size
This is the size of the image in bytes. If you multiply the image size with the im-
age sample rate then you know how many bytes per second are transferred by
this link over the PCI bus.
Images in RxFifoDMA
This is the number of images that are in the board’s DMA fifo waiting to be trans-
ferred over the PCI bus. Normally this value should be 0 (zero) or 1. If this value
rises then this means that the PCI bus is overloaded.
DWORDs in RxFifoDMA
This is the same counter as the images in RxFifoDMA. The only difference is that
this is now expressed in DWORDs.
Dropped images
This counter increments when the board’s DMA fifo is full and an additional image
arrives. If this happens then something is seriously wrong. This means that the
board is unable to transfer images over the PCI bus.
DMA buffer size
DMA buffer size for this interface.
