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Operation
Theory
4.3
Digital I/O Data Flow
When applying digital input functions, the data will be sampled into
the input FIFO periodically as we configured and then transfer to
the system memory by the bus mastering DMA of the PCI Bridge.
Figure 4-2 show the data flow of the 16-bit digital input operation.
Figure 4-2: Data flow of digital input
On the other hand, Figure 4-3 shows the data flow of 16-bit digital
output operation. After the bus mastering DMA of the PCI Bridge
transfers the output data to the output FIFO, the cPCI/PCI/PCIe-
7300A will output the data to the external devices in a pre-
assigned period.
Figure 4-3: Data flow of digital output
The width of local data bus on the cPCI/PCI/PCIe-7300A can be
programmable to be 8-bit, 16-bit or 32-bit. The default data width
is 16-bit. Port A is default to be input port, and Port B is default to
be output one. When 8-bit data width is applied, only the lower
byte of the bus will be used. While we program the data width to
be 32-bit, the two ports will operate in the same manner.
Содержание cPCI-7300A
Страница 4: ......
Страница 10: ...vi List of Figures...
Страница 18: ...8 Introduction...
Страница 21: ...Installation 11 2 4 cPCI PCI PCIe 7300A Layout Figure 2 1 PCI 7300A Layout Diagram...
Страница 22: ...12 Installation Figure 2 2 cPCI 7300A Layout Diagram Figure 2 3 PCIe 7300A Layout Diagram 167 65 111 15...
Страница 26: ...16 Installation Figure 2 4 CN1 Pin Assignment...
Страница 100: ...90 C C Libraries BufNotDWordAlign DMADscrBadAlign...
Страница 108: ...98 C C Libraries...
Страница 114: ...104 Appendix...