MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 337

• 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
The reservation protocol for a single-level (local) bus is illustrated in
protocol assumes that an external logic on the bus carries out the following functions:
The MPC555 / MPC556 samples the CR line at the rising edge of CLKOUT. When this
signal is asserted, the reservation flag is reset.
The EBI samples the logical value of the reservation flag prior to externally starting a
bus cycle initiated by the RCPU stwcx instruction. If the reservation flag is set, the EBI
begins with the bus cycle. If the reservation flag is reset, no bus cycle is initiated ex-
ternally, and this situation is reported to the RCPU.
The reservation protocol for a multi-level (local) bus is illustrated in
system describes the situation in which the reserved location is sited in the remote
bus.
lwarx
• 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
MPC556
MPC555 /
MPC556
External Bus
CLKOUT
S
R
Interface
Q
Figure 9-29 Reservation On Local Bus
AT[0:3], RSV, R/W, TS
EXTERNAL BUS INTERFACE
CR
Rev. 15 October 2000
External Bus
Reservation
Logic
ADDR[0:29]
CR
Figure
Figure
MOTOROLA
9-30. The
9-29. The
Master
Bus
9-41