请教一下，我使用LPC2141作为与USB主机控制器ISP1160相连的微处理器，在ISP1160的DATESHEET的数据传输部分中提到ITL(Isochronous Trahsfer List)和ATL(Acknowledged Transfer List)，请问分别是什么意思？有什么用处？谢谢！
The ITL buffer is a Ping-Pong structured FIFO buffer RAM that is used to keep the payload data and their PTD header for Isochronous transfers. The ATL buffer is a non Ping-Pong structured FIFO buffer RAM that is used for the other three types of transfers.
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