3.7 Optical Link and USB Access
The board houses a USB2.0 compliant port, providing a transfer rate up to 30 MB/s, and a daisy
chainable Optical Link (communication path which uses optical fiber cables as physical
transmission line) providing transfer rate up to 80 MB/s. The latter allows to connect up to 8
DT5740 boards to a single A2818 PCI Optical Link Controller or up to 32 boards to a single A3818
PCIe Optical Link Controller.
Detailed information on CAEN PCI/PCIe Controllers can be find at www.caen.it:
Home / Products / Modular Pulse Processing Electronics / PCI/PCIe / Optical Controllers
The parameters for read/write accesses via optical link are Address Modifier, Base Address, data
Width, etc.; wrong parameter settings cause Bus Error.
Bit[3] at register address 0xEF00 allows to enable the module to broadcast an interrupt request
on the Optical Link; the enabled Optical Link Controllers propagate the interrupt on the PCI bus
as a request from the Optical Link is sensed.
Interrupts can also be managed at the CAENDigitizer library level (see “Interrupt Configuration”
in the library User Manual).
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