PNX1302EH NXP Semiconductors, PNX1302EH Datasheet - Page 330

• Manufacturer Part Number: PNX1302EH
• Manufacturer: NXP Semiconductors

Specifications of PNX1302EH

• Lead Free Status / RoHS Status: Not Compliant

Philips Semiconductors
Clipped unsigned multiply
SYNTAX
OPERATION
DESCRIPTION
range [2
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r30 = 0x10, r40 = 0x20
r10 = 0, r30 = 0x10, r40 = 0x20
r20 = 1, r30 = 0x10, r40 = 0x20
r50 = 0x40000000, r90 = 2
r80 = 0xffffffff
r70 = 0x80000000, r90 = 2
As shown below, the
The
[ IF rguard ] dspumul rsrc1 rsrc2 → rdest
if rguard then {
}
rsrc1
Full-precision
temp ← zero_ext32to64(rsrc1) × zero_ext32to64(rsrc2)
if (unsigned)temp > 0x00000000ffffffff then
else
64-bit result
dspumul
31
rdest ← 0xffffffff
rdest ← temp<31:0>
32
–1..0] (or [0xffffffff..0]), and stores the clipped value into rdest.
Initial Values
63
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
dspumul
unsigned
rdest
operation computes unsigned product rsrc1×rsrc2, clips the result into the unsigned
31
dspumul r30 r40 → r60
IF r10 dspumul r30 r40 → r80
IF r20 dspumul r30 r40 → r100
dspumul r50 r90 → r110
dspumul r80 r80 → r120
dspumul r70 r90 → r120
0
Clip to [2
Operation
unsigned
unsigned
×
32
–1..0]
PRELIMINARY SPECIFICATION
rsrc2
31
PNX1300/01/02/11 DSPCPU Operations
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r60 ← 0x200
no change, since guard is false
r100 ← 0x200
r110 ← 0x80000000
r120 ← 0xffffffff
r120 ← 0xffffffff
dspiabs dspiadd dspisub
dspuadd dspumul dspusub
unsigned
ATTRIBUTES
SEE ALSO
Result
dspumul
0
ifmul
142
2, 3
No
—
0
2
3
A-32