(3)地址寄存器(Address Register)或偏移寄存器(Offset Register):每个 DMA通道都有一个16位的地址寄存器,表示系统RAM中的DMA缓冲区的起始位置在页内的偏移。
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其他常见的格式还有 X-Form(接受两个加在一起的寄存器)和 A-Form(可保存一个常量或一个常量相对偏移量地址)。
The other popular formats are the X-Form, which takes two registers which are added together, or the A-Form, which can hold a constant or a constant relative offset address.
这取决于平台abi;通常在一组指定的寄存器或从“堆栈指针”以固定偏移量。
It depends on the platform ABI; generally either in a designated set of registers or at fixed offsets from a "stack pointer".
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