Single-CPU Readout
Dual-CPU Readout
FASTBUS/VME boards
ROC














CPU












Readout job
(by interrupts)
Data processing
job
Networking
job
FASTBUS/VME boards
ROC













CPU1



CPU2





Readout job
(by interrupts)
Data processing
job
Networking
job
VME
DMA
VME
DMA
PCI
DMA
to
EB
to
EB
DAQ is limited by CPU speed:
 several jobs on one CPU
DAQ limit is much higher:
up to 5 CPUs can be installed