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====== Electronics ====== | ====== Electronics ====== | ||
+ | * [[Electronics# | ||
+ | * [[Electronics# | ||
+ | * [[Electronics# | ||
+ | * [[Electronics# | ||
+ | * [[Trigger|ULM Trigger module]] | ||
+ | * [[Timing|Timing modules]] | ||
+ | * [[XLM Delay|XLM Delay module]] | ||
+ | | ||
+ | ===== Crate Configuration ===== | ||
- | ===== General description ===== | + | Most of the S800 electronics is installed in two racks inside the cabinet seating on the top level of the S3 vault, right in the north side of the [[Stations#Focal Plane Station|focal plane station chamber]] (see picture below). There is a total of six crates mounted |
- | The S800 trigger source comes from the fast timing scintillator | + | |
- | Because the USB-based S800 data acquisition uses independent crate controllers that perform the readout in parallel, time stamping and busy schemes are incorporated in the trigger to synchronize events and insure no trigger is generated while readout sequences are being executed. Because of this modularity, adding an external data acquisition system (typically from an external detector), is straightforward. | ||
- | ===== Trigger Box ===== | + | {{: |
- | The main purpose | + | |
- | - The reduction of cabling and number of modules involved in the implementation of the trigger logic. | ||
- | - The possibility to remotely control and inspect trigger signals, even while beam is present in the vault. | ||
- | - The possibility to save and restore the trigger configuration at any time. | ||
- | The trigger schematic is shown on the Graphical User Interface (GUI) displayed in the figure below. | ||
- | {{: | ||
+ | === VME crate === | ||
+ | {{: | ||
- | The two main trigger sources are labeled " | ||
- | In addition to the singles and coincidence triggers, two separate trigger sources labeled " | + | === CAMAC crate === |
+ | {{: | ||
- | Since more than one trigger source can be selected, it is possible that more than one pulse is generated at the output of the trigger box, depending on the timing and shape of the source signals. When both downscaled singles and coincidences are selected for instance, the "Raw trigger" | ||
+ | === NIM crate 1 === | ||
+ | {{: | ||
- | The S800 trigger from the [[Detectors# | ||
- | ===== Time stamping ===== | + | === NIM crate 2 === |
- | Because the USB-based S800 data acquisition uses independent | + | {{:wiki:nim-crate2.jpg? |
- | The time stamp module is implemented in a VME XLM72 (SpartanXL) FPGA. The schematics of the firmware is available. | ||
- | The inputs are the following: | + | === NIM crate 3 === |
+ | {{:wiki: | ||
- | * E1: time stamp clock input | ||
- | * E2: latch input | ||
- | * E3: clear input | ||
- | The clear can be done via software as well, and is usually done that way. | + | === NIM crate 4 === |
+ | {{: | ||
- | The trigger module FPGA configuration contains a 64 bit counter which is latched by the "Live trigger" | ||
- | The clock signal is released when the " | + | ===== Inventory Modules ===== |
- | + | In progress. | |
- | The time stamping clock is available as an output that can be distributed to other time stamp modules, such as the one located in the S800 VME crate, or in other data acquisition systems coupled to the S800. | + | |
- | ===== Busy circuit | + | ===== Electronic Diagrams |
- | As each controller and external data acquisition perform their readout sequence in parallel, they have different busy times. The global busy signal is formed by a logical OR of all busy signals. To eliminate delays caused by the cables routing the individual signals, the S800 trigger uses local latches that are set by the trigger signal and reset by the individual end-of-event signals. The length of the global busy is then determined by the slowest readout sequence. | + | * {{: |
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
- | The busy circuit following the generation of raw triggers is mainly composed of a latch that is set by the "Raw trigger" | ||
- | ===== Gate generation | + | ===== Documentation |
- | All digitizer gates and start signals are derived from the live trigger signal, with the exception of the QDC gate which is directly generated from the S800 source signal. The reason is to avoid long analog delays on the scintillator signals. A fast clear circuit is provided to clear the QDC if no valid trigger was generated. | + | |
+ | * Manuals for electronic modules | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * Firmware FPGA Schematics | ||
+ | * {{: | ||
+ | * {{: | ||
+ | * {{: | ||
- | ===== Inspect channels ===== | ||
- | A set of four inspect channels are patched out to the Data-U6 panels. Each channel can be assigned to any connection drawn on the GUI, thereby providing a convenient way to diagnose and adjust the timings at each step of the trigger circuit. | ||
- | ===== Configuration for S800 in tandem with other detectors ===== | ||
- | In its standard configuration, | ||
- | To incorporate an external detector in the S800 trigger logic, the same busy and end-of-event signals are required from its data acquisition system. This is to ensure that no live trigger signal is generated when any of the partners is busy or still processing an event. The 5 signals necessary between the S800 trigger and an external data acquisition system are the following: | ||
- | • Raw trigger from external detector to Secondary source | ||
- | • Live trigger from S800 trigger to external data acquisition (trigger input) | ||
- | • Time stamp clock from S800 trigger to external data acquisition (time stamp input) | ||
- | • End-of-event from external data acquisition to S800 trigger | ||
- | • Busy from external data acquisition to S800 trigger | ||
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- | Begin sequence | ||
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- | The internal " | ||
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- | The data acquisition begin sequence of the trigger module is the following: | ||
- | reset time stamp counter to 0 | ||
- | reset trigger register to 0 | ||
- | after all modules in all crates have been initialized, | ||
- | after a preset delay of 200 to 300 microseconds, | ||
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- | The last step of the begin sequence allows enough time for the CCUSB crate controller to switch from its interactive mode to data acquisition mode. The end sequence script executed at the end of a run sets the " | ||
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- | Scalers and dead time | ||
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- | The " | ||
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- | In addition, scalers are connected to the raw and live trigger signals. For the determination of the dead time, both a free running and vetoed 10 kHz pulser signal are also connected to scalers. This is the preferred method because the pulser is not subject to possible double triggering effects like the raw trigger. | ||
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- | Trigger module | ||
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- | The S800 trigger logic is built in a LeCroy ULM2367 FPGA module. Note that this module could be replaced in the future by another FPGA module provided it has enough NIM or ECL input/ | ||
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- | CAMAC commands | ||
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- | The following table lists the CAMAC codes recognized by the trigger module and their signification. | ||
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- | F A Direction | ||
- | 0 0 Read 16 0 Write S800 Gate & Delay (delay) | ||
- | 0 1 Read 16 1 Write S800 Gate & Delay (width) | ||
- | 0 2 Read 16 2 Write Secondary Gate & Delay (delay) | ||
- | 0 3 Read 16 3 Write Secondary Gate & Delay (width) | ||
- | 0 4 Read 16 4 Write S800 Delay (delay) | ||
- | 0 5 Read 16 5 Write Coincidence Gate (width) | ||
- | 0 6 Read 16 6 Write Secondary Delay (delay) | ||
- | 0 7 Read 16 7 Write Bypasses (bit pattern) | ||
- | 0 8 Read 16 8 Write S800 Downscaler (factor) | ||
- | 0 9 Read 16 9 Write Secondary Downscaler (factor) | ||
- | 0 10 Read 16 10 Write Trigger Box (bit pattern) | ||
- | 0 11 Read 16 11 Write Go signal (bit) | ||
- | 0 12 Read 16 12 Write External Time Stamp Clock (bit 0) | ||
- | and External Time Stamp Latch (bit 1) | ||
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- | 0 14 Read | ||
- | 0 15 Read | ||
- | 1 0 Read 17 0 Write Inspect Channel 1 (wire) | ||
- | 1 1 Read 17 1 Write Inspect Channel 2 (wire) | ||
- | 1 2 Read 17 2 Write Inspect Channel 3 (wire) | ||
- | 1 3 Read 17 3 Write Inspect Channel 4 (wire) | ||
- | 2 0 Read 18 0 Write ADC Gate (width) | ||
- | 2 1 Read 18 1 Write QDC Gate (width) | ||
- | 2 2 Read 18 2 Write TDC Gate (width) | ||
- | 2 3 Read 18 3 Write Coincidence Register Gate (width) | ||
- | 3 0 Read | ||
- | 3 1 Read Time Stamp (bits 0-15) | ||
- | 3 2 Read Time Stamp (bits 16-31) | ||
- | 3 3 Read Time Stamp (bits 32-47) | ||
- | 3 4 Read Time Stamp (bits 48-63) | ||
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- | Inputs and outputs | ||
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- | The following table lists the inputs and outputs to/from the trigger module and their assignment. | ||
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- | Pin Assignment | ||
- | A1 (in) S800 source | ||
- | A2 (in) Secondary source | ||
- | A3 (in) External 1 source | ||
- | A4 (in) External 2 source | ||
- | A5 (in) Clear busy B5 (out) TDC start C5 (in) Busy 5 D5 (out) S800 trigger | ||
- | A6 (in) Clear module | ||
- | A7 (in) Gretina sync B7 (out) C7 (in) Busy 7 D7 (out) External 1 trigger | ||
- | A8 (in) Time stamp clock B8 (out) Live trigger | ||
- | B9 (out) Inspect 1 C9 (out) Time stamp clock D9 (out) Secondary trigger | ||
- | B10 (out) Inspect 2 C10 (out) Time stamp latch D10 (out) Raw trigger | ||
- | B11 (out) Inspect 3 C11 (out) D11 (out) Live trigger | ||
- | B12 (out) Inspect 4 C12 (out) D12 (out) Raw pulser | ||
- | B13 (out) Fast clear C13 (out) D13 (out) Live pulser | ||
- | B14 (out) C14 (out) D14 (out) Fast clear | ||
- | B15 (out) Go C15 (out) D15 (out) 10 Hz | ||
- | B16 (out) Time stamp clock C16 (out) D16 (out) 1 Hz | ||
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- | FPGA firmware | ||
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- | The firmware of the trigger module is shown in the following files. The PDF file contains the schematic sheets, used for most of the design. The Verilog file contains the block dealing with CAMAC communications. | ||
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- | File containing the schematics: File: | ||
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- | Below is the Verilog code used in the configuration for the INTERNAL module: | ||
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- | ) ; | ||
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- | input N ; | ||
- | input S1 ; | ||
- | input S2 ; | ||
- | input Clock ; | ||
- | input [4:0] F ; | ||
- | input [3:0] A ; | ||
- | input [23:0] Data_in ; | ||
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- | input [4:0] Register; | ||
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- | input [63:0] TimeStamp; | ||
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- | // add your declarations here | ||
- | reg X; | ||
- | reg Q; | ||
- | reg DriveRead ; | ||
- | reg ClearModule; | ||
- | reg ClearRegister; | ||
- | reg Go; | ||
- | reg [1:0] Select; | ||
- | reg SyncEnable; | ||
- | reg [23:0] Data_out ; | ||
- | reg [7:0] S800Delay; | ||
- | reg [7:0] S800Width ; | ||
- | reg [7:0] SecondaryDelay; | ||
- | reg [7:0] SecondaryWidth ; | ||
- | reg [7:0] S800TimingDelay; | ||
- | reg [7:0] CoincTimingWidth ; | ||
- | reg [7:0] SecondaryTimingDelay ; | ||
- | reg [4:0] Bypasses ; | ||
- | reg [9:0] S800Factor ; | ||
- | reg [9:0] SecondaryFactor ; | ||
- | reg [4:0] TriggerBox ; | ||
- | reg [7:0] ADCGate ; | ||
- | reg [7:0] QDCGate ; | ||
- | reg [7:0] TDCStart ; | ||
- | reg [7:0] Coincidence ; | ||
- | reg [4:0] Inspect1 ; | ||
- | reg [4:0] Inspect2 ; | ||
- | reg [4:0] Inspect3 ; | ||
- | reg [4:0] Inspect4 ; | ||
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- | // add your code here | ||
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- | if (N) begin | ||
- | case (F) | ||
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- | case (A) | ||
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- | end // F=0 | ||
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- | case (A) | ||
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- | end // F=1 | ||
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- | case (A) | ||
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- | end // F=2 | ||
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- | case (A) | ||
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- | end // F=3 | ||
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- | end // F=9 | ||
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- | if (S1) begin | ||
- | case (A) | ||
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- | end // S1=1 | ||
- | end // F=16 | ||
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- | if (S1) begin | ||
- | case (A) | ||
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- | end // S1=1 | ||
- | end // F=17 | ||
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- | if (S1) begin | ||
- | case (A) | ||
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- | end // S1=1 | ||
- | end // F=18 | ||
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- | end //N=1 | ||
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- | end // always Clock | ||
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- | if (N) begin | ||
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- | case (F) | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=0 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=1 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=2 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=3 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=9 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=9 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=16 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=17 | ||
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- | X = 1'b1; | ||
- | Q = 1'b1; | ||
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- | end // F=18 | ||
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- | X = 1'b0; | ||
- | Q = 1'b0; | ||
- | end // default F | ||
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- | end // if (N) | ||
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- | else begin | ||
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- | X = 1'b0; | ||
- | Q = 1'b0; | ||
- | end // if (!N) | ||
- | end // always N or S1 or A or F | ||
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- | This page was last modified on 8 January 2013, at 22:16. | ||
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