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trigger [2013/12/10 21:14] pereira created |
trigger [2013/12/11 16:32] pereira [Scalers and dead time] |
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- | ====== Trigger ====== | ||
The main purpose of the trigger is to implement a coincidence between the S800 focal-plane fast timing scintillator [[Detectors# | The main purpose of the trigger is to implement a coincidence between the S800 focal-plane fast timing scintillator [[Detectors# | ||
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- Direct visualization of the trigger logic and configuration | - Direct visualization of the trigger logic and configuration | ||
- | Probably the most appealing feature of this module is the possibility to remotely control the trigger timing and configuration while beam is present in the vault, since most experiments are nowadays locating their electronics close to the detectors. | + | Probably the most appealing feature of this module is the possibility to remotely control the trigger timing and configuration while beam is present in the vault, since most experiments are nowadays locating their electronics close to the detectors. For more details on this detector check section " |
- | The S800 trigger from the [[Detectors# | ||
- | ===== Trigger | + | The S800 trigger from the [[Detectors# |
+ | |||
+ | |||
+ | ===== Trigger | ||
+ | |||
The trigger schematic is shown on the Graphical User Interface (GUI) displayed in the figure below. | The trigger schematic is shown on the Graphical User Interface (GUI) displayed in the figure below. | ||
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- | ==== Trigger | + | ==== Trigger |
In addition to the singles and coincidence triggers, two separate trigger sources labeled " | In addition to the singles and coincidence triggers, two separate trigger sources labeled " | ||
- | 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" | + | 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" |
- | More details about the trigger box module and its FPGA schematics can be found [[here]]. | + | More details about the trigger box module and its FPGA schematics can be found in section "[[Trigger# |
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- | ==== Busy circuit | + | ==== Busy Circuit |
As each controller and external data acquisition perform their readout sequence in parallel, they have different busy times. The busy circuit following the generation of raw triggers is mainly composed of a latch that is set by the "Raw trigger" | As each controller and external data acquisition perform their readout sequence in parallel, they have different busy times. The busy circuit following the generation of raw triggers is mainly composed of a latch that is set by the "Raw trigger" | ||
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==== Time Stamping Scheme ==== | ==== Time Stamping Scheme ==== | ||
- | Because the USB-based S800 data acquisition uses independent crate controllers that perform the readout in parallel, time stamping | + | Because the USB-based S800 data acquisition uses independent crate controllers that perform the readout in parallel, time stamping schemes are incorporated in the trigger to synchronize events. Because of this modularity, |
+ | More details about the time stamping module can be found in section " | ||
+ | ===== Trigger module ===== | ||
+ | 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/ | ||
+ | ==== CAMAC commands ==== | ||
- | ===== Time Stamping ===== | + | A table with the list of the CAMAC commands recognized |
- | The S800 trigger provides a vetoed 10 MHz clock signal (derived from the 40 MHz FPGA clock) used for time stamping. An external clock can also be used, after selecting | + | |
- | 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. The time stamp module is implemented in a XLM72 (SpartanXL) FPGA. The schematics of the firmware is available [{{: | ||
- | E1: time stamp clock input | + | ==== Inputs and outputs ==== |
+ | A table with the list of inputs/ | ||
- | E2: latch input | + | ==== FPGA firmware ==== |
+ | The firmware of the trigger module is shown in the following files. The {{:wiki: | ||
- | E3: clear input | ||
- | The clear can be done via software as well, and is usually done that way. | + | ====== Time stamping ====== |
+ | The S800 trigger provides a vetoed 10 MHz clock signal (derived from the 40 MHz FPGA clock) used for time stamping. An external clock can also be used, after selecting the appropriate check box in the [[Trigger# | ||
- | Below is the Verilog code of the REGISTERS module of the FPGA configuration, responsible for the communication with the VME bus: | + | 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. |
+ | The time stamp module is implemented in a XLM72 (SpartanXL) FPGA. The schematics of the firmware is available {{: | ||
+ | E1: time stamp clock input | ||
- | ===== Configuration for S800 in tandem with other detectors ===== | + | E2: latch input |
- | 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 | + | |
- | • 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 | + | |
+ | E3: clear input | ||
+ | The clear can be done via software as well, and is usually done that way. | ||
+ | The [[Verilog Time stamping|Verilog file]] contains the code of the REGISTERS module of the FPGA configuration, | ||
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+ | ====== 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 ===== | ||
- | The internal " | ||
- | 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, | ||
- | 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 " | ||
- | ===== Scalers and dead time ===== | ||
- | The " | ||
- | 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. | ||
- | ===== Trigger module ===== | ||
- | The S800 trigger | + | ====== Begin sequence ====== |
+ | The internal " | ||
- | ==== CAMAC commands ==== | + | The data acquisition begin sequence of the trigger module |
- | + | | |
- | The following table lists the CAMAC codes recognized by the trigger module | + | |
- | + | | |
- | F A Direction | + | |
- | 0 | + | |
- | 0 1 Read 16 1 Write S800 Gate & Delay (width) | + | |
- | 0 | + | |
- | 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 | + | |
- | 0 12 Read 16 12 Write External Time Stamp Clock (bit 0) | + | |
- | and External Time Stamp Latch (bit 1) | + | |
- | 0 14 Read | + | The last step of the begin sequence allows enough time for the CC-USB 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 " |
- | 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) | + | |
- | ==== Inputs | + | ====== Scalers |
+ | The " | ||
- | The following table lists the inputs | + | 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 |
- | Pin Assignment | + | The list below is a direct copy of the scaler description file for the s800. This file maps channel names to channel numbers, and in addition determines the layout. |
- | 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 | + | |
- | ==== FPGA firmware ==== | + | ^ Channel name ^ Channel number ^ Channel name ^ Channel number | |
- | 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. | + | | Live.Trigger |
+ | | Live.Clock | ||
+ | | S800.Source | ||
+ | | Second.Source ^ 1 | Second.Trigger ^ 8 | | ||
+ | | Ext1.Source | ||
+ | | Ext2.Source | ||
+ | | Coinc.Trigger ^ 5 | ||
+ | | E1.Up ^ 16 | E1.Down | ||
+ | | E2.Up ^ 18 | E2.Down | ||
+ | | CRDC1.Anode | ||
+ | | TPPAC1 | ||
+ | | OBJ.Scint | ||
+ | | TAR.Scint | ||
+ | | S800.Source | ||
+ | | S800.Source | ||
+ | | S800.Source | ||
+ | | Hodo.OR ^ 30 | ^ | | ||
- | File containing the schematics: File: | ||
- | |||
- | 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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