ADLINK Technology PCI-7200 Especificações descarregar pdf (Página 37)

Operation Theorem •• 27

4.4 Handshaking

In PCI-7200, it also supports a handshaking digital I/O transfer

mode. That is, after input data is ready, an I_REQ is sent form

external device, and I_ACK will go high to acknowledge the data

already accessed.

I_REQ & I_ACK for Digital Input

1. Digital Input Data is ready

2. An I_REQ signal is generated for digital input operation

3. Digital input data is saved to FIFO

4. An I_ACK signal is generated and sent to outside device

5. If the FIFO is not empty and PCI bus is not occupied, the data

will be transferred to main memory

Latch Digital Input

or Digital Output

Digital Input FIFO

Bus mastering

DMA data Transfer

PC's Main Memory

Digital Input DATA

IN_REQ

IN_ACK

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 90 91

PCI-7200 / cPCI-7200 1
CONTENTS 5
Contents •• iii 7
How to Use This Guide 9
Introduction 11
1.1 Applications 12
1.2 Features 12
1.3 Specifications 13
4 •• Introduction 14
Installation 15
2.2 Unpacking 16
Installation •• 7 17
2.4 PCI-7200’s Layout 18
Installation •• 9 19
10 •• Installation 20
2.6 Connector Pin Assignment 21
12 •• Installation 22
8254 Timer/Counter 23
4MHz Clock 23
14 •• Installation 24
3.1 I/O Registers Format 25
Base +18 27
Base +19 27
Base +20 27
Base +21 27
Base +1C 29
Base +1D 29
Base +1E 29
Base +1F 29
Operation Theorem 33
4.2 Timer Pacer Mode 34
Latch Digital Input 35
Digital Input FIFO 35
PC's Main Memory 35
26 •• Operation Theorem 36
Operation Theorem •• 27 37
28 •• Operation Theorem 38
Operation Theorem •• 29 39
30 •• Operation Theorem 40
Operation Theorem •• 31 41
C/C++ & DLL Libraries 43
Ÿ Windows 95/98 46
5.4 _7200_Initial 46
5.5 _7200_Switch_Card_No 48
5.6 _7200_AUX_DI 49
5.7 _7200_AUX_DI_Channel 50
5.8 _7200_AUX_DO 51
5.9 _7200_AUX_DO_Channel 52
5.10 _7200_DI 53
5.11 _7200_DI_Channel 54
5.12 _7200_DO 55
5.13 _7200_DO_Channel 56
5.14 _7200_Alloc_DMA_Mem 57
5.15 _7200_Free_DMA_Mem 59
5.16 _7200_Alloc_DBDMA_Mem 60
5.17 _7200_Free_DBDMA_Mem 61
5.18 _7200_DI_DMA_Start 62
5.19 _7200_DI_DMA_Status 66
5.20 _7200_DI_DMA_Stop 67
5.21 _7200_DblBufferMode 68
5.22 _7200_CheckHalfReady 69
5.23 _7200_DblBufferTransfer 70
5.24 _7200_GetOverrunStatus 71
5.25 _7200_DO_DMA_Start 72
5.26 _7200_DO_DMA_Status 74
5.27 _7200_DO_DMA_Stop 75
Counter 0 76
Digital Input Trigger 76
4MHz Input 78
Double Buffer Mode Principle 81
> > > 82
> > 82
Limitation 83
Appendix A. 8254 85
Programmable Interval Timer 85
A.2 The Control Byte 86
A.3 Mode Definition 87
Product Warranty/Service 91

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