Motorola MPC860 PowerQUICC User Manual page 392

Part IV. Hardware Interface
CLKOUT
BR
BG (Output)
BB
A[0Ð31]
R/W
TSIZ[0Ð1]
BURST
TS
Data
TA
BI
RETRY
If a burst access is acknowledged on its Þrst beat with a normal TA, but with BI asserted,
the following single-beat transfers initiated by the MPC860 to complete the 16 byte
transfers process the RETRY signal assertion as a TEA. If the MPC860 initiates non-burst
access to a small port size device, the transfer size of the access is bigger than the slave port
size, and the Þrst transfer of this access is terminated normally by the assertion of TA, then
subsequent single-beat transfers initiated by the MPC860 to complete the access process
the RETRY assertion as a TEA.
Table 14-6 summarizes how the MPC860 recognizes the termination signals provided by
the slave device that is addressed by the initiated transfer.
14-40
Allow external master
to gain the bus
a
If asserted will cause transfer error
Figure 14-31. Retry on Burst Cycle
MPC860 PowerQUICC UserÕs Manual
a
MOTOROLA