ICH4的spec中有个IDE_CONFIG—IDE I/O Configuration Register(IDE—D31:F1) 9 p* ]* Q+ g r. ^1 ~8 IBit10:WR_PingPong_EN — R/W. 6 p; `0 L T9 G0 W' V0 = Disabled. The buffer behaves similar to PIIX4. * r6 {6 P& O# Z2 T0 c/ M1 = Enables the write buffer to be used in a split (ping/pong) manner. ) X6 Q; ?- |3 j哪位给解释下是什么意思呀,这一位的功能是什么呀?