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Chapter 4 Signal Connections
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National Instruments Corporation 4-19 PCI-4451/4452 User Manual
General-Purpose Timing Signal Connections
The general-purpose timing signals are GPCTR0_SOURCE,
GPCTR0_GATE, GPCTR0_OUT, GPCTR0_UP_DOWN,
GPCTR1_SOURCE, GPCTR1_GATE, GPCTR1_OUT,
GPCTR1_UP_DOWN, and FREQ_OUT.
GPCTR0_SOURCE Signal
Any PFI pin can externally input the GPCTR0_SOURCE signal, which
is available as an output on the PFI8/GPCTR0_SOURCE pin.
As an input, the GPCTR0_SOURCE signal is configured in the
edge-detection mode. You can select any PFI pin as the source for
GPCTR0_SOURCE and configure the polarity selection for either rising
or falling edge.
As an output, the GPCTR0_SOURCE signal reflects the actual clock
connected to general-purpose counter 0. This is true even if another PFI
signal is externally inputting the source clock. This output is set to tri-state
at startup.
Figure 4-9 shows the timing requirements for the GPCTR0_SOURCE
signal.
Figure 4-9.
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.
t
p
t
w
t
w
t
p
t
w
= 50 ns minimum
= 23 ns minimum
User.book Page 19 Tuesday, April 14, 1998 10:20 AM
- PCI-4451/4452 User Manual 1
- Important Information 3
- Contents 4
- Chapter 4 5
- About This Manual 8
- PCI-4451/4452 User Manual x 9
- Related Documentation 10
- Customer Communication 10
- Introduction 11
- What You Need to Get Started 12
- Unpacking 12
- Software Programming Choices 13
- Optional Equipment 14
- Custom Cabling 14
- Chapter 1 Introduction 15
- Software Installation 16
- Hardware Installation 16
- Device Configuration 17
- Hardware Overview 18
- Figure 3-2 19
- Analog Function Block Diagram 19
- Analog Input 20
- Table 3-1 21
- Analog Output 22
- Table 3-2 23
- Figure 3-3 24
- Chapter 3 Hardware Overview 25
- PCI-4451/4452 User Manual 3-8 25
- RTSI Triggers 26
- Digital I/O 27
- Timing Signal Routing 28
- Device Configuration Issues 30
- Signal Connections 31
- Figure 4-1 32
- Analog Pin Connections 32
- Table 4-1 33
- Table 4-2 34
- Analog I/O Signal Summary 34
- Figure 4-2 35
- Digital Pin Connections 35
- Table 4-3 36
- Table 4-4 38
- Digital I/O Signal Summary 38
- Figure 4-3 39
- Analog Input Stage 39
- Types of Signal Sources 40
- Figure 4-4 41
- Analog Power Connections 42
- Figure 4-5 43
- Digital I/O Connections 43
- Digital Power Connections 44
- Timing Connections 44
- CONVERT* 45
- Scan Counter 45
- PFI0/TRIG1 (EXT_TRIG) Signal 46
- PFI1/TRIG2 (PRETRIG) Signal 47
- CONVERT* Signal 47
- EXTSTROBE* Signal 48
- WFTRIG Signal 48
- UPDATE* Signal 48
- GPCTR0_SOURCE Signal 49
- GPCTR0_GATE Signal 50
- GPCTR0_OUT Signal 50
- GPCTR0_UP_DOWN Signal 50
- GPCTR1_SOURCE Signal 51
- GPCTR1_GATE Signal 51
- GPCTR1_OUT Signal 52
- GPCTR1_UP_DOWN Signal 52
- Figure 4-13 53
- GPCTR Timing Summary 53
- Field Wiring Considerations 54
- Chapter 4 Signal Connections 55
- Calibration 56
- Self-Calibration 57
- External Calibration 57
- Traceable Recalibration 58
- Theory of Analog Operation 59
- Input Coupling 60
- Antialias Filtering 61
- PCI-4451/4452 User Manual 6-4 62
- Figure 6-1 63
- Input Frequency Response 63
- Figure 6-2 64
- Figure 6-3 65
- Figure 6-4 66
- Analog Output Circuitry 68
- Figure 6-5 69
- Signal Spectra in the DAC 69
- Mute Feature 71
- Specifications 72
- Transfer Characteristics 73
- Amplifier Characteristics 74
- Dynamic Characteristics 75
- Onboard Calibration Reference 76
- Channel Characteristics 76
- Timing I/O 79
- Triggers 80
- Analog Trigger 80
- Digital Trigger 80
- Bus Interface 80
- Power Requirement 80
- Physical 81
- Environment 81
- Pin Connections 82
- Figure B-1 83
- Country Telephone Fax 85
- Technical Support Form 86
- Configuration Form 87
- Edition Date: 88
- Part Number: 88
- Mail to: 88
- Numbers/Symbols 89
- PCI-4451/4452 User Manual G-2 90
- PCI-4451/4452 User Manual G-4 92
- PCI-4451/4452 User Manual G-6 94
- PCI-4451/4452 User Manual G-8 96
- Glossary 100
- PCI-4451/4452 User Manual I-2 109
- PCI-4451/4452 User Manual I-4 111
- PCI-4451/4452 User Manual I-6 113
- PCI-4451/4452 User Manual I-8 115
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