mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 225

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Memory Management Unit
During the memory management unit’s address translation, the most-significant bits of the
missed effective address are replaced by the real page address bits from the level two page
descriptor. The number of replaced bits depends on the page size. The rest of the real
address bits are taken directly from the effective address. See Table 11-1 for details.
Table 11-1. Number of Effective Address Bits Replaced
PAGE SIZE
PAGE SIZE
Table 11-2. Number of Identical Entries Required in
Table 11-3. Number of Identical Entries Required in
512K
512K
16K
16K
8M
8M
1K
4K
1K
4K
Freescale Semiconductor, Inc.
PAGE SIZE
For More Information On This Product,
512K
16K
8M
1K
4K
MPC823 REFERENCE MANUAL
By Real Address Bits
Go to: www.freescale.com
the Level Two Table
the Level One Table
MD_CTR
MD_CTR
1,024
512
16
1
1
1
1
8
1
4
TWAM
TWAM
EFFECTIVE ADDRESS BITS
NUMBER OF REPLACED
= 0
= 0
20
20
18
13
9
MD_CTR
MD_CTR
1,024
128
—
—
1
1
1
2
1
4
TWAM
TWAM
= 1
= 1
MOTOROLA