PNX1301EH NXP Semiconductors, PNX1301EH Datasheet - Page 445
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PNX1301EH
Manufacturer Part Number
PNX1301EH
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1301EH.pdf
(548 pages)
Specifications of PNX1301EH
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PNX1300/01/02/11 Data Book
prefd
SYNTAX
[ IF rguard ] prefd(d) rsrc1
FUNCTION
DESCRIPTION
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 prefd
operation will not be executed when the cache is already occupied with 2 cache misses, when the operation is issued.
of the prefetch operation. If the LSB of rguard is 1, prefetch operation is executed; otherwise, it is not executed..
EXAMPLES
NOTE: This operation may only be supported in TM-1000, TM-1100, TM-1300 and
PNX1300/01/02/11. It is not guaranteed to be available in future generations of Trimedia
products.
A-147
r10 = 0xabcd,
cache_block_size = 0x40
r10 = 0xabcd, r11 = 0,
cache_block_size = 0x40
r10 = 0xabff, r11 = 1,
cache_block_size = 0x40
The prefd operation loads the one full cache block size of memory value from the address computed by ((rsrc1+d) &
The prefd operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the execution
if rguard then {
}
cache_block_mask = ~(cache_block_size - 1)
data_cache <- mem[(rsrc1 + d) & cache_block_mask]
Initial Values
PRELIMINARY SPECIFICATION
prefd(0xd) r10
IF r11 prefd(0xd) r10
IF r11 prefd(ox1) r10
Operation
Loads a cache line for the address space from
0xabc0 to 0x0xabff from the main memory. If the data
is already in the cache, the operation is not executed.
since guard is false, prefd 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.
prefetch with displacement
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
pref16x pref32x prefr
allocd allocr allocx
Philips Semiconductors
Result
ATTRIBUTES
SEE ALSO
–256..252 by 4
dmemspec
7 bits
209
1
5
-
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