S_DMA_LOW_WATERMARK
#define M_DMA_LOW_WATERMARK _SB_MAKEMASK(16, S_DMA_LOW_WATERMARK)
#define V_DMA_LOW_WATERMARK(x) _SB_MAKEVALUE(x, S_DMA_LOW_WATERMARK)
#define G_DMA_LOW_WATERMARK(x) _SB_GETVALUE(x, S_DMA_LOW_WATERMARK, M_DMA_LOW_WATERMARK)