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The TEA signal is used to signal a nonrecoverable error during the data transaction. The
TEA
signal will be recognized anytime during the assertion of DBB or when a valid
DR'IRY could be sampled. The assertion of TEA tenninates the data tenure immediately
even
if
in the middle of a burst; however, it does not prevent incorrect data that has just been
acknowledged with TA from being written into the 604 's cache or GPRs. The assertion of
TEA initiates either a machine check exception or a checkstop condition based on the
setting of the MSR.
An assertion of AR'IRY causes the data tenure to be tenninated immediately if the AR'IRY
is for the address tenure associated with the data tenure in operation (the data tenure may
not be tenninated due to address pipelining).
If
AR'IRY is connected for the 604, the
earliest allowable assertion of TA to the 604 is directly dependent on the earliest possible
assertion of AR'IRY to the 604; see Section 8.3.3, "Address Transfer Termination."
8.4.4.1 Normal Single-Beat Termination
Normal tennination of a single-beat data read operation occurs when TA is asserted by a
responding slave. The TEA and DRTRY signals must remain negated during the transfer
(see Figure 8-10).
I
artfY
I
I
0
AACK i-1 - - - - - - - -
1
2
3
Figure 8·10. Normal Slngle-Beat Read Termination
Chapter 8.
System
Interface Operation
4
8-25
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