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dccci
Data Cache Congruence Class Invalidate
PPC440x5 CPU Core User’s Manual Preliminary
Page 304 of 589
instrset.fm.
September 12, 2002
dccci
Data Cache Congruence Class Invalidate
DCCCI
This instruction flash invalidates the entire data cache array. The RA and RB operands are not used; previous
implementations used these operands to calculate an effective address (EA) which specified the particular
block or blocks to be invalidated. The instruction form (including the specification of RA and RB operands) is
maintained for software and tool compatibility.
Registers Altered
• None
Invalid Instruction Forms
• Reserved fields
Programming Notes
Execution of this instruction is privileged.
This instruction is intended for use in the power-on reset routine to invalidate the entire data cache array
before caching is enabled.
Architecture Note
This instruction is implementation-specific and programs which use this instruction may not be portable to
other PowerPC Book-E implementations. See Instruction Set Portability on page 250.
dccci RA, RB
31 RA RB 454
0 6 11 16 21 31