For the SPLIT and RETRY response the following transfer must be cancelled because
it must not take place before the current transfer has completed. However, for the
ERROR response, where the current transfer is not repeated, completion of the
following transfer is optional.
这里说的“following transfer”是指的当前主机对其他从机的操作还是同一个burst的后面的传输还是其他什么的呢?