mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 254

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

11.6.1.13 MMU TABLEWALK SPECIAL REGISTER. The MMU tablewalk special
(M_TW) register is used as a scratch register in the software tablewalk interrupt handler.
11.6.2 MMU Data Content-Addressable Registers
The MD_CAM, MD_RAM0, and MD_RAM1 registers are interface registers that allow you
to read the data memory management unit CAM and RAM entries. If you try to write to the
MD_CAM register using the mtspr instruction, the CAM and RAM values of the entry
indexed by the DTLB_INDX field to MD_CAM, MD_RAM0, and MD_RAM1 will be loaded.
The source register in the mtspr instruction can be any register, since its value is not used.
The values of the MD_CAM, MD_RAM0, and MD_RAM1 registers can be read using the
mfspr instruction. If you try to write to the MD_RAM0 and MD_RAM1 registers using the
mtspr instruction, it will be considered a NOP (no operation) instruction.
M_TW
NOTE: — = Undefined.
RESET
RESET
ADDR
ADDR
R/W
R/W
BIT
BIT
16
0
17
1
18
2
Freescale Semiconductor, Inc.
For More Information On This Product,
19
3
20
MPC823 REFERENCE MANUAL
4
Go to: www.freescale.com
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5
22
6
23
SPR 799
SPR 799
7
M_TW
M_TW
R/W
R/W
24
8
25
9
10
26
11
27
Memory Management Unit
12
28
13
29
14
30
11-37
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