PNX1302EH NXP Semiconductors, PNX1302EH Datasheet - Page 325

• Manufacturer Part Number: PNX1302EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1302EH

• Lead Free Status / RoHS Status: Not Compliant

PNX1300/01/02/11 Data Book
dspidualmul
SYNTAX
FUNCTION
DESCRIPTION
pairs of high and low 16-bit halfwords of rsrc1 and rsrc2. Both products 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
A-27
r30 = 0x0020010, r40 = 0x00030020
r10 = 0, r30 = 0x0020010, r40 = 0x00030020
r20 = 1, r30 = 0x0020010, r40 = 0x00030020
r50 = 0x80000002, r80 = 0x00024000
r110 = 0x08000003, r120 = 0x00108001
As shown below, the
The
[ IF rguard ] dspidualmul rsrc1 rsrc2 → rdest
if rguard then {
}
32-bit signed products
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>
Two full-precision
dspidualmul
31
31
Initial Values
signed
dspidualmul
PRELIMINARY SPECIFICATION
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls
Clip to [2
15
rdest
signed
15
–1..–2
31
signed
Dual clipped multiply of signed 16-bit halfwords
operation computes two 16-bit clipped, signed products separately on the two
15
dspidualmul r30 r40 → r60
IF r10 dspidualmul r30 r40 → r70
IF r20 dspidualmul r30 r40 → r100
dspidualmul r50 r80 → r90
dspidualmul r110 r120 → r125
]
signed
0
0
15
Operation
31
rsrc2
31
signed
signed
Clip to [2
×
signed
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
15
dspidualabs dspidualadd
–1..–2
dspidualsub dspiabs
Philips Semiconductors
15
15
r60 ← 0x00060200
no change, since guard is false
r100 ← 0x00060200
r90 ← 0x80007fff
r125 ← 0x7fff8000
]
ATTRIBUTES
SEE ALSO
signed
×
Result
15
–1..–2
0
dspmul
2, 3
No
95
—
0
2
3
15
] (or