Motorola MPC533 Reference Manual page 362

Bus Operations
External Bus
Interface
MPC5xx Device
Figure 9-31. Reservation On Multilevel Bus Hierarchy
In this case, the bus interface block implements a reservation flag for the local bus master.
The reservation flag is set by the bus interface when a load with reservation is issued by the
local bus master and the reservation address is located on the remote bus. The flag is reset
(negated) when an alternative master on the remote bus accesses the same location in a
write cycle. If the MPC533 begins a memory cycle to the previously reserved address
(located in the remote bus) as a result of an stwcx instruction, the following two cases can
occur:
9-46
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
External Bus (Local Bus)
AT[0:3], RSV, R/W, TS
KR
Q
Remote Bus
MPC533 Reference Manual
ADDR[0:29]
Local Master Accesses with
lwarx
to Remove Bus Address
S
R
A Master in the Remote Bus Write
to the Reserved Location
Buses
Interface
MOTOROLA