National-instruments 6023E Manuel d'utilisateur Page 74
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Chapter 4 Signal Connections
6023E/6024E/6025E User Manual 4-44 ni.com
Figure 4-35 shows the timing requirements for the GPCTR0_SOURCE
signal.
Figure 4-35. GPCTR0_SOURCE Signal Timing
The maximum allowed frequency is 20 MHz, with a minimum pulse width
of 23 ns high or low. There is no minimum frequency limitation.
The 20 MHz or 100 kHz timebase normally generates the
GPCTR0_SOURCE signal unless you select some external source.
GPCTR0_GATE Signal
Any PFI pin can externally input the GPCTR0_GATE signal, which is
available as an output on the PFI9/GPCTR0_GATE pin.
As an input, the GPCTR0_GATE signal is configured in the edge-detection
mode. You can select any PFI pin as the source for GPCTR0_GATE and
configure the polarity selection for either rising or falling edge. You can use
the gate signal in a variety of different applications to perform actions such
as starting and stopping the counter, generating interrupts, saving the
counter contents, and so on.
As an output, the GPCTR0_GATE signal reflects the actual gate signal
connected to general-purpose counter 0. This is true even if the gate is
externally generated by another PFI. This output is set to high impedance
at startup. Figure 4-36 shows the timing requirements for the
GPCTR0_GATE signal.
t
p
t
w
t
w
t
p
t
w
= 50 ns minimum
= 23 ns minimum
- 6023E/6024E/6025E 1
- User Manual 1
- Important Information 3
- Contents 4
- Chapter 4 5
- About This Manual 9
- Related Documentation 10
- Introduction 11
- Using PXI with CompactPCI 12
- What You Need to Get Started 12
- Software Programming Choices 13
- NI-DAQ Driver Software 14
- Optional Equipment 15
- Chapter 1 Introduction 16
- Software Installation 17
- Unpacking 17
- Hardware Installation 18
- Hardware Configuration 19
- PCI-6025E, and PXI-6025E 20
- Analog Input 21
- Input Range 22
- Dithering 23
- Figure 3-3 24
- Analog Output 25
- Digital I/O 26
- Timing Signal Routing 26
- Programmable Function Inputs 27
- Device and RTSI Clocks 28
- RTSI Triggers 28
- Chapter 3 Hardware Overview 29
- Table 3-3 30
- Signal Connections 31
- Chapter 4 Signal Connections 32
- 6024E, and 6025E 34
- Table 4-3. I/O Signal Summary 37
- Analog Input Signal Overview 38
- Floating Signal Sources 39
- Analog Input Modes 39
- Signal Sources 44
- Sources (RSE Configuration) 48
- Sources (NRSE Configuration) 48
- Figure 4-8 49
- All Devices 50
- Port C Pin Assignments 53
- Power-up State 54
- Timing Specifications 55
- Mode 1 Input Timing 57
- Mode 1 Output Timing 58
- Mode 2 Bidirectional Timing 59
- Power Connections 60
- Timing Connections 60
- DAQ Timing Connections 62
- SCANCLK Signal 63
- EXTSTROBE* Signal 63
- TRIG1 Signal 64
- = 50-100 ns 65
- STARTSCAN Signal 66
- Figure 4-25 67
- STARTSCAN Input Signal Timing 67
- Figure 4-26 67
- = 10 ns minimum 68
- AIGATE Signal 69
- SISOURCE Signal 70
- WFTRIG Signal 70
- UPDATE* Signal 71
- UISOURCE Signal 72
- GPCTR0_SOURCE Signal 73
- GPCTR0_GATE Signal 74
- GPCTR0_OUT Signal 75
- GPCTR0_UP_DOWN Signal 75
- GPCTR1_SOURCE Signal 76
- GPCTR1_GATE Signal 76
- GPCTR1_OUT Signal 77
- GPCTR1_UP_DOWN Signal 77
- Field Wiring Considerations 79
- Calibration 80
- Self-Calibration 81
- External Calibration 81
- Other Considerations 82
- Specifications 83
- Accuracy Information 84
- Transfer Characteristics 85
- Amplifier Characteristics 85
- Output Characteristics 86
- Dynamic Characteristics 86
- Stability 86
- Voltage Output 88
- DIO<0..7> 89
- Timing I/O 90
- Operating Environment 92
- Storage Environment 92
- PCMCIA Bus 93
- Triggers 99
- Digital Trigger 99
- Power Requirement 99
- Physical 100
- Environment 100
- Custom Cabling and Optional 101
- Connectors 101
- Optional Connectors 102
- Figure B-1 103
- Common Questions 107
- Analog Input and Output 108
- Timing and Digital I/O 109
- Select_Signal 110
- Appendix C Common Questions 111
- Technical Support Resources 112
- Worldwide Support 113
- Glossary 114
- See also breakdown voltage 126
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