MPC564EVB Freescale Semiconductor, MPC564EVB Datasheet - Page 440

• Manufacturer Part Number: MPC564EVB
• Description: KIT EVAL FOR MPC561/562/563/564
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC564EVB

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC56x
• Data Bus Width: 32 bit
• Interface Type: RS-232, Ethernet
• For Use With/related Products: MPC561, 562, 563, 564
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

L-Bus to U-Bus Interface (L2U)
When a load to or store from the U-bus resource is issued by the RCPU, it is compared against the DMPU
region access (address and attribute) comparators. If none of the access attributes are violated, the access
is directed to the U-bus by the L2U module. If the DMPU detects an access violation, it informs the error
status to the master initiating the cycle.
When show cycles are enabled, accesses to all of the L-bus resources by the RCPU are made visible on
the U-bus side by the L2U.
The L2U is responsible for handling the effects of reservations on the L-bus and the U-bus. For the L-bus
and the U-bus, the L2U detects reservation losses and updates the RCPU core with the reservation status.
11.4.2
While hard or soft reset is asserted on the U-bus, the L2U asserts the corresponding L-bus reset signals.
Upon soft reset assertion, the L2U goes to an idle state and all pending accesses are ignored. Additionally,
the L2U module control registers are not initialized on soft reset, keeping the system configuration
unchanged.
Upon assertion of hard reset, the L2U control registers are initialized to their reset states. The L2U also
drives the reset configuration word from the U-bus to the L-bus upon hard reset.
11.4.3
In the peripheral mode of operation the RCPU is shut down and an alternative master on the external bus
can perform accesses to any internal bus (U-bus and L-bus) slave.
The external master can also access the internal MPC500 special registers that are located in the L2U
module. In order to access one of these MPC500 registers the EMCR[CONT] bit in the USIU must be
cleared.
11.4.4
Factory test mode is a special mode of operation that allows access to the internal modules for testing. This
mode is not intended for general use and is not supported for normal applications.
11.5
The data memory protection unit (DMPU) in the L2U module provides access protection for the memory
regions on the U-bus side from load/store accesses by the RCPU. (Only U-bus space is protected.) The
DMPU does not protect MPC500 register accesses initiated by the RCPU on the L-bus. The user can assign
up to four regions of access protection attributes and can assign global attributes to any space not included
in the active regions. When it detects an access violation, the L2U generates an exception request to the
CPU. A functional diagram of the DMPU is shown in
11-4
Data Memory Protection
Reset Operation
Peripheral Mode
Factory Test Mode
MPC561/MPC563 Reference Manual, Rev. 1.2
Figure
11-2.
Freescale Semiconductor