PNX1311EH NXP Semiconductors, PNX1311EH Datasheet - Page 304

• Manufacturer Part Number: PNX1311EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1311EH

• Lead Free Status / RoHS Status: Not Compliant

Philips Semiconductors
Allocate a cache block with index
SYNTAX
[ IF rguard ] allocr rsrc1 rsrc2
FUNCTION
DESCRIPTION
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 allocr operation. If the LSB of rguard is 1, allocr operation is executed; otherwise, it is not executed.
EXAMPLES
r10 = 0xabcd, r12 = 0x32
cache_block_size = 0x40
r10 = 0xabcd, r11 = 0, r12=0x32,
cache_block_size = 0x40
r10 = 0xabff, r11 = 1, r12 =0x4,
cache_block_size = 0x40
The allocr 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 block with [(rsrc1 + rsrc2) & cache_block_mask] address
allocr
Initial Values
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
allocr r10 r12
IF r11 allocr r10 r12
IF r11 allocr r10 r12
Operation
PRELIMINARY SPECIFICATION
Allocates a cache block for the address space from
0xabc0 to 0xabff without fetching the data from main
memory; The data in this address space is undefined.
since guard is false, allocr 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.
PNX1300/01/02/11 DSPCPU Operations
[(rsrc1 + rscr2) & cache_block_mask]
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
Result
allocd allocx
ATTRIBUTES
SEE ALSO
allocr
dmemspec
214
No
2
5
-
-
and
A-6