Difference between revisions of "Time to digital converter (TDC)"

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This module is a software implementation, no need of hardware to work. The TDC will capture the time stamp of the input channels by rising edge so long the gate is activated. The maximal time resolution is 10 ns and can be changed through a programmable divider, an external signal can be used as TDC clock too.
 
This module is a software implementation, no need of hardware to work. The TDC will capture the time stamp of the input channels by rising edge so long the gate is activated. The maximal time resolution is 10 ns and can be changed through a programmable divider, an external signal can be used as TDC clock too.
  
−
This module has a bus interface to connect with a FIFO, in this FIFO will be written the channel and time information of each rising edge, so long the gate is active. The number of channels and length of the time stamp counters depends on the selected model.
+
This module has a bus interface to connect with a FIFO, in this FIFO will be written the channel mask, to indicate which channel was activated, and time information, so long the gate is active. The number of channels and length of the time stamp counters depends on the selected model.
  
−
During the gate a package will be written in the FIFO. This package can consists of a Start of gate marker, 0 to N events marker and a stop of gate marker.
+
During the gate a package will be written in the FIFO. This package or event can consists of a Start of gate marker, 0 to N subevents/hits marker and a stop of gate marker.
  
 +
== VHDL versions ==
  
−
== Models ==
+
05.04.11 V1.0
 +
07.04.11 Extended with Timebase and 8 Channels
 +
29.04.11 EOG recording added
 +
01.07.11 V1.1: 1 Channel Version with 32b Time added
 +
18.08.11 V1.2: TimeReg cleared on read
 +
21.02.12 V1.3: DisableEOG implemented
 +
22.02.12 V1.4: TriggerMode with Retrigger implemented
 +
24.02.12 V1.5: SOG & EOG control independent of Mode
 +
28.01.15 V1.6: SOG & EOG bug fixed, now is really working
 +
                Programmable delay between channel input and gate signal implemented
 +
 
 +
== VHDL models ==
  
 
At this time there are two models. The model 0 has only one event channel and the model 1 8 event channels. The event marker are different for each model. The model 0 event marker is a 32-bits time information and the model 1 event marker consist of 8-Bit channel mask to indicate which channels has been toggle and 24-bit with the time stamp   
 
At this time there are two models. The model 0 has only one event channel and the model 1 8 event channels. The event marker are different for each model. The model 0 event marker is a 32-bits time information and the model 1 event marker consist of 8-Bit channel mask to indicate which channels has been toggle and 24-bit with the time stamp   
Line 84: Line 96:
 
|-
 
|-
 
|0  
 
|0  
−
|MUX_OUT
+
|MUX_GATE
−
|Bit 7..0: multiplexer address
+
|Bit 7..0: gate multiplexer address
 
|-
 
|-
 
|1
 
|1
−
|Debounce
+
|MUX_CLOCK
−
|Bit 7..0: input value
+
|Bit 7..0: clock multiplexer address
 
|-
 
|-
 
|2  
 
|2  
−
| Mode
+
|CLOCK_DIVIDER
−
|Bit 0:  
+
|Bit 31..0:  
−
  '1' 50 Ohm termination
+
|-
−
  '0' Open
+
|3
−
Bit 1: NIM/TTL
+
|MUX_EVENT_CHANNEL
−
  '1' NIM
+
|Bit 7..0: event channel multiplexer address
−
'0' TTL 
+
|-
 +
|11
 +
|CONF_REG
 +
|  
 +
  Bit 0: disable end of gate (EOG)
 +
Bit 1: disable start of gate (SOG)
 +
  Bit 2: retrigger
 +
|-
 +
|12
 +
|GATE_TIME
 +
|Bit 31..0: if this value is set to 0 the end of gate will be controlled through the gate input, otherwise the gate will be a duration of this value x clock period
 +
|-
 +
|13
 +
|DATA_DELAY
 +
|Bit 2..0: programmable delay from 0 to 70 ns in 10 ns step between the gate and the input channels.
 
|}
 
|}
  
−
=== Read/Write register ===
+
== Register Map Model 1 ==
 +
 
 +
Module Address: 'B' or Ox42
 +
 
 +
=== Read register ===
  
 
{| border="1" class="wikitable"
 
{| border="1" class="wikitable"
−
|+ Read/Write registers
+
|+ Read registers
 
! scope="col" | Register Address
 
! scope="col" | Register Address
 
! scope="col" | Name  
 
! scope="col" | Name  
Line 114: Line 144:
 
|-
 
|-
 
| 1
 
| 1
−
| STATE_IN
+
| EVENT MARKER
−
| Bit 7..0: input value
+
| Bit 31..0: current event information
 
|}
 
|}
  
−
== LabVIEW Vi ==
+
=== Write register ===
  
−
=== Inputs ===
+
{| border="1" class="wikitable"
 +
|+ Write registers
 +
! scope="col" | Register Address
 +
! scope="col" | Name
 +
! scope="col" | Data
 +
|-
 +
|0
 +
|MUX_GATE
 +
|Bit 7..0: gate multiplexer address
 +
|-
 +
|1
 +
|MUX_CLOCK
 +
|Bit 7..0: clock multiplexer address
 +
|-
 +
|2
 +
|CLOCK_DIVIDER
 +
|Bit 31..0:
 +
|-
 +
|3
 +
|MUX_EVENT_CHANNEL_0
 +
|Bit 7..0: event channel 0 multiplexer address
 +
|-
 +
|4
 +
|MUX_EVENT_CHANNEL_1
 +
|Bit 7..0: event channel 1 multiplexer address
 +
|-
 +
|5
 +
|MUX_EVENT_CHANNEL_2
 +
|Bit 7..0: event channel 2 multiplexer address
 +
|-
 +
|6
 +
|MUX_EVENT_CHANNEL_3
 +
|Bit 7..0: event channel 3 multiplexer address
 +
|-
 +
|7
 +
|MUX_EVENT_CHANNEL_4
 +
|Bit 7..0: event channel 4 multiplexer address
 +
|-
 +
|8
 +
|MUX_EVENT_CHANNEL_5
 +
|Bit 7..0: event channel 5 multiplexer address
 +
|-
 +
|9
 +
|MUX_EVENT_CHANNEL_6
 +
|Bit 7..0: event channel 6 multiplexer address
 +
|-
 +
|10
 +
|MUX_EVENT_CHANNEL_7
 +
|Bit 7..0: event channel 7 multiplexer address
 +
|-
 +
|11
 +
|CONF_REG
 +
| 
 +
Bit 0: disable end of gate (EOG)
 +
Bit 1: disable start of gate (SOG)
 +
Bit 2: retrigger
 +
|-
 +
|12
 +
|GATE_TIME
 +
|Bit 31..0: if this value is set to 0 the end of gate will be controlled through the gate input, otherwise the gate will be a duration of this value x clock period
 +
|-
 +
|13
 +
|DATA_DELAY
 +
|Bit 2..0: create a delay between the gate and the input event channels.
 +
|}
 +
 
 +
TDC
  
−
  Input 1:
 
−
  Input 2:
 
  
  
−
=== Outputs ===
+
== LabVIEW ==
−
  Output 1:
 
−
  Output 2:
 
  
−
=== Parameters ===
+
[[File:TDC_LabVIEW.png]]
−
  Param 1:
 
−
  Param 2:
 
  
−
=== Functions ===
+
=== Global parameters ===
−
   Function 1:  
+
 
−
   Function 2:
+
This parameters must always be connected
 +
 
 +
TDC#: number of module (must be unique)
 +
USB In and USB Out are related to the selected USB interface, No connection uses a global     
 +
parameter, set by OPEN.vi!
 +
 
 +
=== Signal inputs ===
 +
 
 +
A signal input, is a hardware input which control some functionality of the module.
 +
 +
  GATE: gate drive signal (address of the signal which will drive this input) 
 +
  CLOCK: clock drive signal (address of the signal which will drive this input). If 0 the 100
 +
              MHz internal clock will be used.
 +
  CHANNEL: array of channel drive signals (addresses of the signals which will drive this
 +
                  inputs)
 +
 
 +
 
 +
=== Signal outputs ===
 +
 
 +
A signal output, is a hardware output which can drive one or more signal inputs. For example a clock generator can drive 2 DIOs
 +
 
 +
  BUS: this signal output should be connected to a FIFO module, in which the TDC package
 +
          will be saved.
 +
 
 +
=== Functions and parameters ===
 +
 
 +
In the LogicPool Vis there is always a input terminal with a parameter called function. This parameter select the function that the user want to call and for this propose need sometimes parameters (input terminals). Here will be listed the function and the parameters that the user should use with each function. If the parameters are not set the last saved parameters will be used and not desired behaviour can happen.
 +
 
 +
 
 +
  "Write PARAMS"
 +
  Set the acquisition parameters of the TDC.
 +
    Parameters:
 +
      Params: cluster compose of:
 +
        SOG: type boolean, if active a Start of gate marker will be written into the FIFO by a
 +
                  rising edge of the Gate input signal
 +
        EOG:  type boolean, if active a End of gate marker will be written into the FIFO by
 +
                  falling edge of the Gate input signal or when the gate time is over if GATE TIME
 +
                  is non zero.
 +
        GATE TIME: type 32-Bit unsigned integer. If non zero the falling edge of the Gate input
 +
                            signal will be ignored, and this value will be used to generate the end of
 +
                            gate.
 +
        DIVIDER: type 32-Bit unsigned integer. divider of the input clock.
 +
        Retrigger: if gate time is non zero and a new gate arrives during the acquisition time,
 +
                    the timestamp will be set to zero and a new acquisition will be started.
 +
 
 +
 
 +
  "Set GATE"
 +
  Connect the gate input signal with a driver module or set it to a constant value.
 +
    Parameters:
 +
      GATE: type 8-bit unsigned. At this input should be connected the output of the driver
 +
                module.
 +
                You can set this input to a constant value through LabVIEW with the help of the
 +
                B_S subvi.
 +
 
 +
  "Set CLOCK"
 +
  Connect the clock input signal with a driver module or set it to a constant value.
 +
    Parameters:
 +
      CLOCK: type 8-bit unsigned. At this input should be connected the output of the driver
 +
                  module.
 +
                  You can set this input to a constant value through LabVIEW with the help of
 +
                  the B_S subvi.
 +
 
 +
  "Set CHANNEL"
 +
  Connect the clock input signal with a driver module or set it to a constant value.
 +
    Parameters:
 +
      CHANNEL: type array of 8-bit unsigned. At this input should be connected and array
 +
                      with the output of the driver modules. You can set this input to a constant
 +
                      value through LabVIEW with the help of the B_S subvi.
 +
 
 +
  "Get BUS"
 +
  Get the state of the write signal of the bus, this BUS consist of write signal + 32-Bit data
 +
 
 +
  "Read Event"
 +
   Read the last marker.
 +
 
 +
  "Set data delay"
 +
  Create a delay between the gate input signals and the input channels signals. This
 +
  functionality is implemented in version 1.6 and higher.
 +
    Parameters:
 +
      DataDelay: type 8-Bit unsigned. The delay can be set between 0 and 70 ns in steps of 10 ns. 
 +
 
 +
   "Connect" connects all signal inputs if any, and initialize the module
 +
    Parameters:
 +
      CHANNEL
 +
      GATE
 +
      CLOCK
 +
      Params
  
 
=== Demo software ===
 
=== Demo software ===
 +
 +
At this moment only the LP_TDC_1_Test.vi is working with the last LabVIEW version. Following modules are needed to test the TDC:
 +
 +
1 x TDC
 +
1 x FIFO
 +
3 x Gate generators
 +
4 x LEDs
 +
3 x DIOs

Latest revision as of 13:20, 28 January 2015

LogicPool (TDC)

This module is a software implementation, no need of hardware to work. The TDC will capture the time stamp of the input channels by rising edge so long the gate is activated. The maximal time resolution is 10 ns and can be changed through a programmable divider, an external signal can be used as TDC clock too.

This module has a bus interface to connect with a FIFO, in this FIFO will be written the channel mask, to indicate which channel was activated, and time information, so long the gate is active. The number of channels and length of the time stamp counters depends on the selected model.

During the gate a package will be written in the FIFO. This package or event can consists of a Start of gate marker, 0 to N subevents/hits marker and a stop of gate marker.

VHDL versions

05.04.11 V1.0
07.04.11 Extended with Timebase and 8 Channels
29.04.11 EOG recording added
01.07.11 V1.1: 1 Channel Version with 32b Time added
18.08.11 V1.2: TimeReg cleared on read
21.02.12 V1.3: DisableEOG implemented
22.02.12 V1.4: TriggerMode with Retrigger implemented
24.02.12 V1.5: SOG & EOG control independent of Mode
28.01.15 V1.6: SOG & EOG bug fixed, now is really working
               Programmable delay between channel input and gate signal implemented

VHDL models

At this time there are two models. The model 0 has only one event channel and the model 1 8 event channels. The event marker are different for each model. The model 0 event marker is a 32-bits time information and the model 1 event marker consist of 8-Bit channel mask to indicate which channels has been toggle and 24-bit with the time stamp


TDC model 1 Package overview
Event Channel info (bits 31..24) Time stamp (bits 23..0) Explanation
SOG 0x00 0x000000 SOG = start of gate, time stamp will be always 0 and no active channels
E1 0x01 0x000064 detected a rising edge on channel 0 100 CLKs after the SOG
E2 0x03 0x000080 detected a rising edge on channel 0 and 1 128 CLKs after the SOG
E3 0x00 0xFFFFFF time stamp counter overflow
E4 0x80 0x0001FF detected a rising edge on channel 7 16777215+511 CLKs after the SOG
EOG 0x00 0x0003FF EOG = end of gate, no active channels and time stamp must be non zero


CBUS Address

Register Map Model 0

Module Address: 'B' or Ox42

Read register

Read registers
Register Address Name Data
0 MUX_IN Bit 7..0: multiplexer address
1 EVENT MARKER Bit 31..0: current event information

Write register

Write registers
Register Address Name Data
0 MUX_GATE Bit 7..0: gate multiplexer address
1 MUX_CLOCK Bit 7..0: clock multiplexer address
2 CLOCK_DIVIDER Bit 31..0:
3 MUX_EVENT_CHANNEL Bit 7..0: event channel multiplexer address
11 CONF_REG 
Bit 0: disable end of gate (EOG)
Bit 1: disable start of gate (SOG)
Bit 2: retrigger
12 GATE_TIME Bit 31..0: if this value is set to 0 the end of gate will be controlled through the gate input, otherwise the gate will be a duration of this value x clock period
13 DATA_DELAY Bit 2..0: programmable delay from 0 to 70 ns in 10 ns step between the gate and the input channels.

Register Map Model 1

Module Address: 'B' or Ox42

Read register

Read registers
Register Address Name Data
0 MUX_IN Bit 7..0: multiplexer address
1 EVENT MARKER Bit 31..0: current event information

Write register

Write registers
Register Address Name Data
0 MUX_GATE Bit 7..0: gate multiplexer address
1 MUX_CLOCK Bit 7..0: clock multiplexer address
2 CLOCK_DIVIDER Bit 31..0:
3 MUX_EVENT_CHANNEL_0 Bit 7..0: event channel 0 multiplexer address
4 MUX_EVENT_CHANNEL_1 Bit 7..0: event channel 1 multiplexer address
5 MUX_EVENT_CHANNEL_2 Bit 7..0: event channel 2 multiplexer address
6 MUX_EVENT_CHANNEL_3 Bit 7..0: event channel 3 multiplexer address
7 MUX_EVENT_CHANNEL_4 Bit 7..0: event channel 4 multiplexer address
8 MUX_EVENT_CHANNEL_5 Bit 7..0: event channel 5 multiplexer address
9 MUX_EVENT_CHANNEL_6 Bit 7..0: event channel 6 multiplexer address
10 MUX_EVENT_CHANNEL_7 Bit 7..0: event channel 7 multiplexer address
11 CONF_REG 
Bit 0: disable end of gate (EOG)
Bit 1: disable start of gate (SOG)
Bit 2: retrigger
12 GATE_TIME Bit 31..0: if this value is set to 0 the end of gate will be controlled through the gate input, otherwise the gate will be a duration of this value x clock period
13 DATA_DELAY Bit 2..0: create a delay between the gate and the input event channels.

TDC


LabVIEW

TDC LabVIEW.png

Global parameters

This parameters must always be connected 

TDC#: number of module (must be unique)
USB In and USB Out are related to the selected USB interface, No connection uses a global      
parameter, set by OPEN.vi!

Signal inputs

A signal input, is a hardware input which control some functionality of the module. 

 GATE: gate drive signal (address of the signal which will drive this input)  
 CLOCK: clock drive signal (address of the signal which will drive this input). If 0 the 100 
              MHz internal clock will be used.
 CHANNEL: array of channel drive signals (addresses of the signals which will drive this 
                  inputs)


Signal outputs

A signal output, is a hardware output which can drive one or more signal inputs. For example a clock generator can drive 2 DIOs 

 BUS: this signal output should be connected to a FIFO module, in which the TDC package 
          will be saved.

Functions and parameters

In the LogicPool Vis there is always a input terminal with a parameter called function. This parameter select the function that the user want to call and for this propose need sometimes parameters (input terminals). Here will be listed the function and the parameters that the user should use with each function. If the parameters are not set the last saved parameters will be used and not desired behaviour can happen. 


 "Write PARAMS"
 Set the acquisition parameters of the TDC. 
   Parameters:
     Params: cluster compose of:
        SOG: type boolean, if active a Start of gate marker will be written into the FIFO by a
                 rising edge of the Gate input signal
        EOG:  type boolean, if active a End of gate marker will be written into the FIFO by 
                  falling edge of the Gate input signal or when the gate time is over if GATE TIME 
                  is non zero. 
        GATE TIME: type 32-Bit unsigned integer. If non zero the falling edge of the Gate input 
                           signal will be ignored, and this value will be used to generate the end of 
                           gate.
        DIVIDER: type 32-Bit unsigned integer. divider of the input clock.
        Retrigger: if gate time is non zero and a new gate arrives during the acquisition time,
                   the timestamp will be set to zero and a new acquisition will be started.



 "Set GATE"
 Connect the gate input signal with a driver module or set it to a constant value.
   Parameters:
     GATE: type 8-bit unsigned. At this input should be connected the output of the driver 
                module. 
                You can set this input to a constant value through LabVIEW with the help of the 
                B_S subvi.

 "Set CLOCK"
 Connect the clock input signal with a driver module or set it to a constant value.
   Parameters:
     CLOCK: type 8-bit unsigned. At this input should be connected the output of the driver 
                  module. 
                  You can set this input to a constant value through LabVIEW with the help of 
                  the B_S subvi.

 "Set CHANNEL"
 Connect the clock input signal with a driver module or set it to a constant value.
   Parameters:
     CHANNEL: type array of 8-bit unsigned. At this input should be connected and array 
                      with the output of the driver modules. You can set this input to a constant 
                      value through LabVIEW with the help of the B_S subvi.

 "Get BUS"
 Get the state of the write signal of the bus, this BUS consist of write signal + 32-Bit data

 "Read Event"
 Read the last marker.

 "Set data delay"
 Create a delay between the gate input signals and the input channels signals. This 
 functionality is implemented in version 1.6 and higher.
   Parameters:
      DataDelay: type 8-Bit unsigned. The delay can be set between 0 and 70 ns in steps of 10 ns.  

 "Connect" connects all signal inputs if any, and initialize the module 
   Parameters:
     CHANNEL
     GATE
     CLOCK
     Params

Demo software

At this moment only the LP_TDC_1_Test.vi is working with the last LabVIEW version. Following modules are needed to test the TDC: 

1 x TDC
1 x FIFO
3 x Gate generators
4 x LEDs
3 x DIOs
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