PNX1311EH NXP Semiconductors, PNX1311EH Datasheet - Page 324

• Manufacturer Part Number: PNX1311EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1311EH

• Lead Free Status / RoHS Status: Not Compliant

Philips Semiconductors
Dual clipped add of signed 16-bit halfwords
SYNTAX
FUNCTION
DESCRIPTION
pairs of high and low 16-bit halfwords of rsrc1 and rsrc2. Both sums are clipped into the range [2
[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 = 0xffff7fff
r110 = 0x00017fff, r120 = 0x7fff7fff
As shown below, the
The
[ IF rguard ] dspidualadd 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>
dspidualadd
31
signed
Initial Values
17-bit signed sums
Two full-precision
dspidualadd
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls
15
rdest
17
31
Clip to [2
signed
operation computes two 16-bit clipped, signed sums separately on the two
signed
dspidualadd r30 r40 → r60
IF r10 dspidualadd r30 r40 → r70
IF r20 dspidualadd r30 r40 → r100
dspidualadd r50 r80 → r90
dspidualadd 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 dspidualmul
dspidualsub dspiabs
15
dspidualadd
ATTRIBUTES
r60 ← 0x12350034
no change, since guard is
false
r100 ← 0x12350034
r90 ← 0x80007fff
r125 ← 0x7fff7fff
SEE ALSO
signed
+
Result
15
–1..–2
dspalu
1, 3
No
70
—
0
2
2
15
A-26
] (or