tm1300 NXP Semiconductors, tm1300 Datasheet - Page 314

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

TM1300 Data Book
dspimul
SYNTAX
FUNCTION
DESCRIPTION
[2
modification of the destination register. If the LSB of r guard is 1, r dest is written; otherwise, r dest is not changed.
EXAMPLES
A-28
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 r guard ] dspimul r src1 r src2
if r guard then {
}
r src1
Full-precision
–1..–2
64-bit result
temp
if temp < 0xffffffff80000000 then
else if temp > 0x000000007fffffff then
else
dspimul
r dest
r dest
r dest
3
31
Initial Values
sign_ext32to64(r src1 )
] (or [0x7fffffff..0x80000000]), and stores the clipped value into r dest . All values are signed integers.
6
0x80000000
0x7fffffff
temp<31:0>
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
dspimul
signed
PRODUCT SPECIFICATION
r dest
sign_ext32to64(r src2 )
operation computes the product r src1 r src2 , 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
3
0
Clip to [2
r dest
Operation
signed
signed
31
–1..–2
r src2
r60
r110
r120
r120
31
3
]
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