參數(shù)資料
型號: PCL-818L
廠商: Electronic Theatre Controls, Inc.
英文描述: High-performance DAS card with programmable gain
中文描述: 高性能DAS的可編程增益卡
文件頁數(shù): 63/74頁
文件大小: 546K
代理商: PCL-818L
Chapter 9 Direct memory access operation
59
Using DMA transfer with the PCL-818L
DMA transfer is a powerful but complicated operation. Different
parts of the DMA transfer have been covered in other parts of this
manual, especially Chapter 5. The following steps summarize how to
use DMA transfer with the PCL-818L:
1. When you configure your hardware, check your to see which (if
any) PC DMA channel is available (level 1 or level 3) and set
PCL-818L jumper JP1 accordingly.
2. If you will be using the PCL-818L driver for your DMA transfer
programming, see the Software Drivers User’s Manual for
information.
3. If you choose to conduct your own DMA operation, you will need
to have a solid understanding of the PC, 8237 DMA controller
and the PCL-818L. Make sure you perform the following steps in
your DMA transfer:
a. Initialize 8237 DMA controller register and page register.
b. Send DMA enable and trigger source data to the PCL-818L
control register located at address BASE+9.
c. Set an external trigger pulse or pacer trigger rate.
d. Enable the trigger source to start the A/D conversion
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