PNX1300 Philips, PNX1300 Datasheet - Page 327
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PNX1300
Manufacturer Part Number
PNX1300
Description
Media Processors
Manufacturer
Philips
Datasheet
1.PNX1300.pdf
(548 pages)
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PNX1300/01/02/11 Data Book
dspimul
SYNTAX
FUNCTION
DESCRIPTION
[2
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
A-29
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
31
[ IF rguard ] dspimul rsrc1 rsrc2
if rguard then {
}
rsrc1
Full-precision
–1..–2
64-bit result
temp
if temp < 0xffffffff80000000 then
else if temp > 0x000000007fffffff then
else
dspimul
31
rdest
rdest
rdest
31
Initial Values
sign_ext32to64(rsrc1)
] (or [0x7fffffff..0x80000000]), and stores the clipped value into rdest. All values are signed integers.
63
0x80000000
0x7fffffff
temp<31:0>
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
PRELIMINARY SPECIFICATION
dspimul
signed
rdest
sign_ext32to64(rsrc2)
operation computes the product rsrc1 rsrc2, clips the result into the 32-bit range
dspimul r30 r40
IF r10 dspimul r30 r40
IF r20 dspimul r30 r40
dspimul r50 r90
dspimul r80 r80
dspimul r70 r90
31
0
Clip to [2
rdest
Operation
signed
signed
31
–1..–2
rsrc2
r60
r110
r120
r120
31
31
]
r80
r100
Clipped signed multiply
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r60
no change, since guard is false
r100
r110
r120
r120
dspiabs dspiadd dspisub
dspuadd dspumul dspusub
signed
Philips Semiconductors
0x200
0x200
0x7fffffff
0x1
0x80000000
ATTRIBUTES
SEE ALSO
Result
0
ifmul
141
2, 3
No
—
0
2
3
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