MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 338

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MPC555
USER’S MANUAL
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 when an alternative master on the remote bus accesses the
same location in a write cycle. If the MPC555 / MPC556 begins a memory cycle to the
previously reserved address (located in the remote bus) as a result of an stwcx in-
struction, the following two cases can occur:
• If the reservation flag is set, the buses interface acknowledges the cycle in a nor-
• If the reservation flag is reset, the bus interface should assert the KR. However,
/
mal way
MPC556
MPC555 /
MPC556
External Bus
Interface
Figure 9-30 Reservation On Multilevel Bus Hierarchy
AT[0:3], RSV, R/W, TS
EXTERNAL BUS INTERFACE
KR
Rev. 15 October 2000
External Bus (Local Bus)
Q
Remote Bus
R
S
A Master in the Remote Bus Write
ADDR[0:29]
to the Reserved Location
Local Master Accesseses with
lwarx
to Remove Bus Address
Interface
Buses
MOTOROLA
9-42