MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 286

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L2 Look-Aside Cache/SRAM
7.3.1.3.1
The L2 memory-mapped SRAM base address registers (L2SRBARn), shown in
lower 18 bits of the 22-bit SRAM base address.
L2SRBAR bits are described in
When enabled, the windows defined in L2SRBARn and L2SRBAREAn supersede all other mappings of
these addresses for processor and global (snoopable) I/O transactions. Therefore, SRAM windows must
never overlap configuration space as defined by CCSRBAR (see
Control, and Status Base Address Register
is discouraged because processor and snoopable I/O transactions would map to the SRAM while
non-snooped I/O transactions would be mapped by the local access windows. Only if all accesses to the
SRAM address range are snoopable can results be consistent if SRAM and local access windows overlap.
7-16
18–31
Offset 0x2_0100
0–17
Reset
Bits
W
R
0x2_0108
0
ADDR Contains the lower 18 bits of the 22-bit L2 memory-mapped SRAM base address; the upper 4 bits are
Name
—
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Figure 7-11. L2 Memory-Mapped SRAM Base Address Registers (L2SRBAR n )
contained in L2SRBAREA n [ADDR]. (Note that some of these bits may not be needed, depending on how the
L2 cache is partitioned.) The combined base address from L2SRBAREA n [ADDR] || L2SRBAR n [ADDR] is
used as follows:
SRAM Partition
64 Kbytes
128 Kbytes
256 Kbytes
Unused bits of the base address are masked off by the hardware.
Reserved
L2 Memory-Mapped SRAM Base Address Registers 0–1 (L2SRBAR n )
Bits Required for SRAM Offset
ADDR
Table
Table 7-8. L2SRBAR n Field Descriptions
16
17
18
7-8.
(CCSRBAR).”) Overlapping SRAM and local access windows
All zeros
Description
17 18
Bits Used for Actual Base Address
20 (0–19)
19 (0–18)
18 (0–17)
Section 4.3.1.1.2, “Configuration,
Figure
—
Freescale Semiconductor
Access: Read/Write
7-11, contain the
31