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question for programming the DMA controller

To: <pci-sig@znyx.com>
Subject: question for programming the DMA controller
From: "Zhang Jun" <zhjun@sd.mech.tohoku.ac.jp>
Date: Wed, 7 Feb 2001 14:25:18 +0900
Sender: owner-reflector@www.pcisig.com

I am studing to design a DMA controller. But I don't know when the CPU can program the DMA controller before a DMA transfer can begin. How the CPU know that it is the time to program the DMA controller. Please give me a help.

Thanks.

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