PNX1302EH NXP Semiconductors, PNX1302EH Datasheet - Page 305

• Manufacturer Part Number: PNX1302EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1302EH

• Lead Free Status / RoHS Status: Not Compliant

PNX1300/01/02/11 Data Book
allocx
SYNTAX
[ IF rguard ] allocx rsrc1 rsrc2
FUNCTION
DESCRIPTION
and sets the status of this cache block as valid. No data is fetched from main memory for this operation. The allocated
cache block data is undefined after this operation. It is the responsibility of the programmer to update the allocated
cache block by store operations.
execution of the allocx operation. If the LSB of rguard is 1, allocx operation is executed; otherwise, it is not executed.
EXAMPLES
A-7
r10 = 0xabcd, r12 = 0xc
cache_block_size = 0x40
r10 = 0xabcd, r11 = 0, r12=0xc,
cache_block_size = 0x40
r10 = 0xabff, r11 = 1, r12 =0x4,
cache_block_size = 0x40
The allocx operation allocate a cache block with the address computed from
Refer to the ‘cache architecture’ section for details on the cache block size.
The
if rguard then {
}
cache_block_mask = ~(cache_block_size -1)]
allocate adata cache blockwith [(rsrc1 + 4 x rsrc2) & cache_block_mask] address
allocx
Initial Values
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
PRELIMINARY SPECIFICATION
allocx r10 r12
IF r11 allocx r10 r12
IF r11 allocx r10 r12
Operation
Allocate a cache block with scaled index
Allocates a cache block for the address space from
0xabc0 to 0x0xabff without fetching the data from
main memory; The data in this address space is
undefined.
since guard is false, allocx operation is not executed
Allocates a cache block for the address space from
0xac00 to 0xac3f without fetching the data from main
memory; the data in this address space is undefined.
[(rsrc1 + 4 x rscr2) & cache_block_mask]
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
Philips Semiconductors
Result
allocd allocr
ATTRIBUTES
SEE ALSO
dmemspec
215
No
2
5
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