Question on Synchronous data transfer -Reply

[PAT LaVARRE (PAT LAVARRE)]

* From the SCSI Reflector, posted by:
* PAT LaVARRE (PAT LAVARRE) <LAVARRE at IOMEGA.COM>
*
> 'Negative offset' does mean that the
> target may not disconnect the data phase.

Eh??

This is legit????

How?!?!?

How can an initiator ACK data before it is
generated?

What happens if the target switches the
phase lines just as the initiator is ACKing?

What makes the two of them agree into which
phase the spurious ACK should be placed?

How can spurious ACK's - noise - even be
recognised?

Pat LaVarre

P.S. I just checked.  I do remember
correctly that the last SCSI chip I bought
freaks if ever the offset falls below zero. 
I lose data.  I have to cancel the transfer.

Anybody know of a SCSI chip that will handle
negative offsets?