PNX1311EH/G NXP Semiconductors, PNX1311EH/G Datasheet - Page 452
PNX1311EH/G
Manufacturer Part Number
PNX1311EH/G
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1311EHG.pdf
(548 pages)
Specifications of PNX1311EH/G
Lead Free Status / RoHS Status
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Philips Semiconductors
Read data cache address tag
SYNTAX
FUNCTION
DESCRIPTION
destination register rdest. The target block in the data cache is determined by bits 13..6 of the result of rsrc1 + d. Bits
10..6 of rsrc1 + d select the cache set and 13..11 of rsrc1 + d select the element within that set. The d value is an
opcode modifier, must be in the range –256 to 252 inclusive, and must be a multiple of 4.
address tag information stored in the cache port that corresponds to the operation slot in which the
is issued.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r10 = 0
r20 = 1
The
rdtag
rdtag
The dual-ported data cache uses two separate copies of tag and status information. A
The
[ IF rguard ] rdtag(d) rsrc1 → rdest
if rguard then {
}
block_addr ← rsrc1 + d
rdest<21:0> ← dcache_tag_block(block_addr)
rdest<31:22> ← 0
rdtag
rdtag
/* block_addr<13:11> selects element, block_addr<10:6> selects set */
writes the address tag for the selected block in bits 21..0 of rdest. All other bits of rdest are set to zero.
requires no stall cycles to complete.
Initial Values
operation reads the address tag associated with a block in the data cache and writes these bits into the
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
rdtag(0) r30 → r60
IF r10 rdtag(4) r40 → r70
IF r20 rdtag(8) r50
Operation
PRELIMINARY SPECIFICATION
→ r80
PNX1300/01/02/11 DSPCPU Operations
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
no change, since guard is false
rdtag
ATTRIBUTES
SEE ALSO
rdstatus
operation returns the
Result
rdtag
–256..252 by 4
dmemspec
rdtag
7 bits
operation
202
1
3
5
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