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RFDigPatch is responsible for the interface (isolation and distribution) of the connection between the digital inputs and outputs of the LLRFProc with other subsystems of the RF plant, such as protection systems (personnel, machine, and equipment) controllers (through Programmable Logic Controllers), vacuum controllers, motor drivers, and arc detectors.

General description

RFDigPatch incorporates the Mestor Blackout Box (MBB) that includes a Spartan-3AN FPGA that provides access to the 32 GPIOs and 4 slow ADCs data for the LLRFProc connected through VHDCI (Very-High-Density Cable Interconnect) serial interface. It’s is attached to a PCB that uses optocouplers to isolate and adapt the signal levels of MBB to the required voltage level of other subsystems. The Rear Panel of the Digital patch panel uses Sub-D and SMA connectors to interface the different systems. It requires a +3.3V, +5V, and +24V DC power supply The simplified diagram with the main components and ports is shown in Fig. 1.

Figure 1: Digital Patch Panel block diagram.

Versions Control

Table 1: RF-DigPatch version control.
Version Date Description
V1I1 First assembly

The schematic, bill of materials, and all other files related to this crate can be found at:
\\centaurus\LNLS\Grupos\RF\Sirius DOC_TEC_RF\Sirius_DOC_TEC_RF\LLRF_Rack\Crates\Digital_Patch_Panel

Devices in use

Table 2: RF-DigPatch devices.
Device # Version Device Name Location
001 V1I1 RA-RaBO01:RF-DigPatch Booster LLRF Rack
002 V1I1 RA-RaSIA01:RF-DigPatch Storage Ring A LLRF Rack

Crate Panels

Figure 2: Digital Patch Panel front panel art.
Figure 3: Digital Patch Panel rear panel art.

Device PVs

There are no PVs associated with this device.


The R131 and R132 resistors of the Digital Patch Panel PCB were replaced. It was a 5kΩ SMD resistor and it was changed for a 0.5kΩ SMD resistor. This resistor is the Opto-coupler (OC13) current limiter.