PNX1300 Philips, PNX1300 Datasheet - Page 451
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PNX1300
Manufacturer Part Number
PNX1300
Description
Media Processors
Manufacturer
Philips
Datasheet
1.PNX1300.pdf
(548 pages)
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PNX1300/01/02/11 Data Book
rdstatus
SYNTAX
FUNCTION
DESCRIPTION
into the destination register rdest. The target set in the data cache is determined by bits 10..6 of the result of rsrc1 + d.
The d value is an opcode modifier, must be in the range –256 to 252 inclusive, and must be a multiple of 4.
rdest are set to zero.
the LRU and dirty information stored in the cache port that corresponds to the operation slot in which the
operation is issued.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
A-153
r10 = 0
r20 = 1
The
The result of
rdstatus
The dual-ported data cache uses two separate copies of tag and status information. A
The
[ IF rguard ] rdstatus(d) rsrc1
if rguard then {
}
set_addr
rdest<9:0>
rdest<17:10>
rdest<31:18>
rdstatus
rdstatus
/* set_addr<10:6> selects set */
Initial Values
requires two stall cycles to complete.
rdstatus
rsrc1 + d
dcache_LRU_set(set_addr)
operation reads the LRU and dirty bits associated with a set in the data cache and writes these bits
dcache_dirty_set(set_addr)
0
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
PRELIMINARY SPECIFICATION
contains LRU information in bits 9..0 and dirty-bit information in bits 17..10. All other bits of
rdstatus(0) r30
IF r10 rdstatus(4) r40
IF r20 rdstatus(8) r50
rdest
Operation
r60
Read data cache status bits
r70
r80
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
no change, since guard is false
rdstatus
Philips Semiconductors
ATTRIBUTES
SEE ALSO
rdtag
Result
operation returns
–256..252 by 4
dmemspec
rdstatus
7 bits
203
1
3
5
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