MPV System
| Ideal case | 0.18 us/word + 0.6 us |
| V792 block read | 0.22 us/word + 0.6us |
Interrupt latency is included in 0.6 us overhead. MPV do parallel readout for VME modules. The DAQ deadtime depends on the module that has the longest readout (+ conversion) time.
Event builder (common trigger)
The maximum data processing rate is 40 MB/s.
Device driver
CAMAC
TOYO CC/NET
| Old (Kernel 2.4) | New (Kernel 2.6) | |
| CAMAC Single | 6.7 us | 5.4 us |
| CAMAC Block PIO | 3.6 us/ch + 2.4 us | 2.6 us/ch + 1.7 us |
| CAMAC Block DMA | 1.2 us/ch + 9.9 us | 1.2 us/ch + 6.7 us |
| INT Latency | 21.7 us | 30.0 us |
There are two hardware versions: old one is Kernel 2.4, newer is Kernel 2.6. Block PIO/DMA is CC/NET special transfer (list sequencer) mode. At the RUN start-up routine, CAMAC command list have to be registered.
VME
SBS 618-3 PCI-VME
| Linux 2.4.29 | |
| 32 bit Single Read | 2.9 us |
| 32 bit Single Write | 2.2 us |
| 32 bit MDA Read | 0.15 us/ch + 34.6 us |
Wiener VMEMM + PCIADA
| Linux 2.4 | |
| 32 bit Single Read | 1.9 us |
| 32 bit Single Write | 1.2 us |
GE funac VMIVME 7807
| Linux 2.4.29 | |
| Map-ummap time | 9.53 us |
| 32 bit Single Map Read | 1.05 us |
| 32 bit MDA Map Read | 0.21 us/ch + 6.6 us |
These values are obtained with CAEN V1190A.
Last-modified: Sun, 05 Jul 2020 22:42:43 HADT (1388d)