PNX1300 Philips, PNX1300 Datasheet - Page 498
PNX1300
Manufacturer Part Number
PNX1300
Description
Media Processors
Manufacturer
Philips
Datasheet
1.PNX1300.pdf
(548 pages)
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Philips Semiconductors
Sum of absolute values of unsigned 8-bit
differences
SYNTAX
FUNCTION
DESCRIPTION
unsigned 8-bit bytes of rsrc1 and rsrc2. The absolute values of the four differences are summed and the result is
written to rdest. All computations are performed without loss of precision.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r80 = 0x0a14f6f6, r30 = 0x1414ecf6
r10 = 0, r80 = 0x0a14f6f6, r30 = 0x1414ecf6
r20 = 1, r90 = 0x64649c9c, r40 = 0x649c649c
r40 = 0x649c649c, r90 = 0x64649c9c
r50 = 0x80808080, r60 = 0x7f7f7f7f
As shown below, the
The
[ IF rguard ] ume8uu rsrc1 rsrc2
if rguard then
rsrc1
rdest
ume8uu
31
unsigned
abs_val(zero_ext8to32(rsrc1<31:24>) – zero_ext8to32(rsrc2<31:24>)) +
abs_val(zero_ext8to32(rsrc1<23:16>) – zero_ext8to32(rsrc2<23:16>)) +
abs_val(zero_ext8to32(rsrc1<15:8>) – zero_ext8to32(rsrc2<15:8>)) +
abs_val(zero_ext8to32(rsrc1<7:0>) – zero_ext8to32(rsrc2<7:0>))
Initial Values
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
23
unsigned
ume8uu
15
unsigned
rdest
operation computes four separate differences of the four pairs of corresponding
31
7
unsigned
ume8uu r80 r30
IF r10 ume8uu r80 r30
IF r20 ume8uu r90 r40
ume8uu r40 r90
ume8uu r50 r60
rdest
0
unsigned
Operation
PRELIMINARY SPECIFICATION
rsrc2
31
unsigned
r100
r120
r125
PNX1300/01/02/11 DSPCPU Operations
23
r70
r110
unsigned
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r100
no change, since guard is false
r110
r120
r125
15
unsigned
0x14
0x70
0x70
0x4
ATTRIBUTES
SEE ALSO
ume8ii
Result
ume8uu
7
unsigned
dspalu
1, 3
No
26
—
0
2
2
A-200
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