PNX1302EH NXP Semiconductors, PNX1302EH Datasheet - Page 326

• Manufacturer Part Number: PNX1302EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1302EH

• Lead Free Status / RoHS Status: Not Compliant

Philips Semiconductors
Dual clipped subtract of signed 16-bit halfwords
SYNTAX
FUNCTION
DESCRIPTION
two pairs of high and low 16-bit halfwords of rsrc1 and rsrc2. Both differences are clipped into the range [2
(or [0x7fff..0x8000]) and written into the corresponding halfwords of rdest. All values are signed 16-bit integers.
the modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r30 = 0x12340032, r40 = 0x00010002
r10 = 0, r30 = 0x12340032, r40 = 0x00010002
r20 = 1, r30 = 0x12340032, r40 = 0x00010002
r50 = 0x80000001, r80 = 0x00018001
r110 = 0x00018001, r120 = 0x80010002
As shown below, the
The
[ IF rguard ] dspidualsub rsrc1 rsrc2 → rdest
if rguard then {
}
rsrc1
temp1 ← sign_ext16to32(rsrc1<15:0>) – sign_ext16to32(rsrc2<15:0>)
temp2 ← sign_ext16to32(rsrc1<31:16>) – sign_ext16to32(rsrc2<31:16>)
if temp1 < 0xffff8000 then temp1 ← 0x8000
if temp2 < 0xffff8000 then temp2 ← 0x8000
if temp1 > 0x7fff then temp1 ← 0x7fff
if temp2 > 0x7fff then temp2 ← 0x7fff
rdest<31:16> ← temp2<15:0>
rdest<15:0> ← temp1<15:0>
dspidualsub
31
17-bit signed differences
signed
Initial Values
Two full-precision
dspidualsub
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls
15
rdest
17
31
signed
Clip to [2
operation computes two 16-bit clipped, signed differences separately on the
signed
dspidualsub r30 r40 → r60
IF r10 dspidualsub r30 r40 → r70
IF r20 dspidualsub r30 r40 → r100
dspidualsub r50 r80 → r90
dspidualsub r110 r120 → r125
15
signed
–1..–2
0
15
]
0
15
17
PRELIMINARY SPECIFICATION
rsrc2
Operation
Clip to [2
31
signed
signed
PNX1300/01/02/11 DSPCPU Operations
15
–1..–2
signed
−
15
]
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
0
dspidualabs dspidualadd
dspidualmul dspiabs
15
dspidualsub
ATTRIBUTES
r60 ← 0x12330030
no change, since guard is
false
r100 ← 0x12330030
r90 ← 0x80007fff
r125 ← 0x7fff8000
SEE ALSO
signed
−
Result
15
dspalu
–1..–2
1, 3
No
71
—
0
2
2
A-28
15
]