mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 1198

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

dcbt
Assembler Syntax
Definition
Operation
Description
FIELD
FIELD
BIT
BIT
16
0
17
1
18
B
2
Freescale Semiconductor, Inc.
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For More Information On This Product,
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3
improved if the block containing the byte addressed by EA is
fetched into the data cache, because the program will probably
soon load from the addressed byte. The hint is ignored if the
block is caching-inhibited. Executing dcbt does not cause the
system alignment error handler to be invoked.
This instruction may be treated as a load from the addressed
byte with respect to address translation, memory protection, and
reference and change recording, except that no exception
occurs in the case of a translation fault or protection violation.
The program uses the dcbt instruction to request a cache block
fetch before it is actually needed by the program. The program
can later execute load instructions to put data into registers.
However, the processor is not obliged to load the addressed
block into the data cache.
Other registers altered:
dcbt
Data Cache Block Touch
EA is the sum (rA|0) + (rB).
This instruction is a hint that performance will probably be
POWERPC ARCHITECTURE
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MPC823 REFERENCE MANUAL
4
None
Go to: www.freescale.com
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5
LEVEL
VEA
rA,rB
22
6
23
7
00000
24
8
25
9
SUPERVISOR
278
LEVEL
10
26
MPC823 Instruction Set—dcbt
11
27
OPTIONAL
12
28
13
29
A
14
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FORM
X
B-45
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0