tm1300 NXP Semiconductors, tm1300 Datasheet - Page 431

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

Philips Semiconductors
prefetch with 32-bit scaled index
SYNTAX
[ IF r guard ] pref32x r src1 r src2
FUNCTION
DESCRIPTION
(4 x rscr2)) & cache_block_mask) and stores the data into the data cache. This operation is not guaranteed to be
executed. The prefetch unit will not execute this operation when the data to be prefetched is already in the data cache.
A pref32x operation will not be executed when the cache is already occupied with 2 cache misses, when the operation
is issued.
execution of the prefetch operation. If the LSB of rguard is 1, prefetch operation is executed; otherwise, it is not
executed..
EXAMPLES
NOTE: This operation is supported only in TM1000, TM1100 and TM1300 and it is not
guaranteed to be available in future generations of this product.
r10 = 0xabcd, r12 = 0xd
cache_block_size = 0x40
r10 = 0xabcd, r11 = 0, r12=0xd,
cache_block_size = 0x40
r10 = 0xabff, r11 = 1, r12 =0x1,
cache_block_size = 0x40
The pref32x operation loads the one full cache block size of memory value from the address computed by ((rsrc1+
The pref32x operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
if r guard then {
}
cache_block_mask = ~(cache_block_size - 1)
data_cache <- mem[(rsrc1 + (4 x rscr2)) & cache_block_mask]
Initial Values
pref32x r10 r12
IF r11 pref32x r10 r12
IF r11 pref32x r10 r12
Operation
PRODUCT SPECIFICATION
Loads a cache line for the address space from
0xac00 to 0x0xac3f from the main memory. If the
data is already in the cache, the operation is not exe-
cuted.
since guard is false, pref32x operation is not executed
Loads a cache line for the address space from
0xac00 to 0x0xac3f from the main memory. If the
data is already in the cache, the operation is not exe-
cuted.
DSPCPU Operations for TM1300
pref16x prefd prefr allocd
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
Result
allocr allocx
ATTRIBUTES
SEE ALSO
pref32x
dmemspec
212
No
2
5
-
-
A-145