tm1300 NXP Semiconductors, tm1300 Datasheet - Page 289

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Allocate a cache block
pseudo-op for allocd(0)
SYNTAX
FUNCTION
DESCRIPTION
(Note: pseudo operations cannot be used in assembly files.)
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.
of the alloc operation. If the LSB of rguard is 1, alloc operation is executed; otherwise, it is not executed.
EXAMPLES
r10 = 0xabcd,
cache_block_size = 0x40
r10 = 0xabcd, r11 = 0,
cache_block_size = 0x40
r10 = 0xac0f, r11 = 1,
cache_block_size = 0x40
The alloc operation is a pseudo operation transformed by the scheduler into an allocd(0) with the same arguments.
The alloc operation allocate a cache block with the address computed from
Refer to the ‘cache architecture’ section for details on the cache block size.
The alloc operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the execution
[ IF r guard ] alloc( d ) r src1
if r guard then {
}
cache_block_mask = ~(cache_block_size -1)]
allocate adata cache block with [(rsrc1 + 0) & cache_block_mask] address
Initial Values
alloc r10
IF r11 alloc r10
IF r11 alloc r10
Operation
PRODUCT SPECIFICATION
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, alloc 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 + 0) & cache_block_mask]
DSPCPU Operations for TM1300
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
allocd allocr allocx
Result
ATTRIBUTES
SEE ALSO
dmemspec
alloc
213
and sets
1
5
-
-
-
A-3