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CLKOUT
BR (Output)
BG
BB
A[0Ð31]
R/W
TSIZ[0Ð1]
BURST
TS
Data
TA
RETRY
Figure 14-30. Retry Transfer TimingÐExternal Arbiter
When the MPC860 initiates a burst access, the bus interface only recognizes the RETRY
assertion as a retry termination if it detects it before the slave device acknowledges the Þrst
data beat. When RETRY is asserted as a termination signal on the second or third data beat
of the access (being the Þrst data beat acknowledged by a normal TA assertion), it is
processed by the MPC860 as a TEA.
MOTOROLA
Allow external master
to gain the bus
A
Chapter 14. MPC860 External Bus Interface
Part IV. Hardware Interface
A
14-39
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