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The reservation protocol for a single-level (local) bus is illustrated in Figure 13-26. It
assumes that external logic on the bus performs the following functions:
• Snoops accesses to all local bus slaves
• Holds one reservation for each local master capable of storage reservations
• Sets the reservation when that master issues a load and reserve request
• Clears the reservation when some other master issues a store to the reservation
address
MPC823e
EXTERNAL BUS
INTERFACE
lwarx
S
Q
R
CLKOUT
Figure 13-26. Reservation On Local Bus
MOTOROLA
E-BUS
AT[0:3], RSV,R/W,TS
RESERVATION
LOGIC
MPC823e REFERENCE MANUAL
External Bus Interface
MASTER
BUS
A[6:31]
13-39
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