L-Bus to U-Bus Interface (L2U)
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
11-13
For these registers a bus cycle will be performed on the L-bus and the U-bus with the address as shown in
.
11.8.1
U-Bus Access
The L2U registers are accessible from the U-bus side only if it is a supervisor mode data access and the
register address is correct and it is indicated on the U-bus that it is a PPC register access.
A user mode access, or an access marked as instruction, to L2U registers from the U-bus side will cause a
data error on the U-bus.
11.8.2
Transaction Size
All L2U registers are defined by MPC500 architecture as being 32-bit registers in normal mode. There is
no MPC500 instruction to access either a half word or a byte of the special purpose register.
All L2U registers are only word accessible (read and write) in peripheral mode. A half-word or byte access
in peripheral mode will result in a word transaction.
11.8.3
L2U Module Configuration Register (L2U_MCR)
The L2U module configuration register (L2U_MCR) is used to control the L2U module operation.
L2U_RA2
826
11001
11010
0x0000_3590
SUPR
Region Attribute Register 2
L2U_RA3
827
11001
11011
0x0000_3790
SUPR
Region Attribute Register 3
L2U_GRA
536
10000
11000
0x0000_3100
SUPR
Global Region Attribute
1
When EMCR[CONT] = 0, for external master access only.
Table 11-6. Hex Address For SPR Cycles
A[0:17]
A[18:22]
A[23:27]
A[28:31]
0
spr[5:9]
spr[0:4]
0
Table 11-5. L2U (PPC) Register Decode (continued)
Name
SPR #
SPR[5:9]
SPR[0:4]
Address for
External Master
Access
1
Access
Description
Summary of Contents for MPC561
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