Analog Devices ADSP-21020 User Manual
Page 10
ADSP-21020
REV. C
–10–
Table V. Multiplier Compute Operations
Rn
= Rx * Ry ( S
S
F
)
Fn
= Fx * Fy
MRF
= Rx * Ry
(
U U I
MRB
= Rx * Ry
( U U
FR
Rn
= MRF + Rx * Ry ( S
S
F
)
Rn
= MRF
– Rx * Ry ( S
S
F
)
Rn
= MRB
+ Rx * Ry (
U U I
Rn
= MRB
= Rx * Ry
(
U U I
MRF
= MRF
+ Rx * Ry ( U U
FR
MRF = MRF
= Rx * Ry
( U U I
FR
MRB
= MRB
MRB = MRB
Rn
= SAT MRF
(SI)
Rn
= RND MRF
(SF)
Rn
= SAT MRB
(UI)
Rn
= RND MRB
(UF)
MRF
= SAT MRF
(SF)
MRF = RND MRF
MRB
= SAT MRB
(UF)
MRB = RND MRB
MRF
= 0
MRB
MRxF
= Rn
Rn
=
MRxF
MRxB
Rn
=
MRxB
Rn, Rx, Ry
R15–R0; register file location, fixed-point
Fn, Fx, Fy
F15–F0; register file location, floating-point
MRxF
MR2F, MR1F; MR0F; multiplier result accumulators, foreground
MRxB
MR2B, MR1B, MR0B; multiplier result accumulators, background
( x-input
y-input
data format, )
( x-input
y-input
rounding
S
Signed input
U
Unsigned input
I
Integer input(s)
F
Fractional input(s)
FR
Fractional inputs, Rounded output
(SF)
Default format for 1-input operations
(SSF)
Default format for 2-input operations
Table VI. Shifter and Shifter Immediate Compute Operations
Shifter
Shifter Immediate
Rn = LSHIFT Rx BY Ry
Rn = LSHIFT Rx BY
Rn = Rn OR LSHIFT Rx BY Ry
Rn = Rn OR LSHIFT Rx BY
Rn = ASHIFT Rx BY Ry
Rn = ASHIFT Rx BY
Rn = Rn OR ASHIFT Rx BY Ry
Rn = Rn OR ASHIFT Rx BY
Rn = ROT Rx BY RY
Rn = ROT Rx BY
Rn = BCLR Rx BY Ry
Rn = BCLR Rx BY
Rn = BSET Rx BY Ry
Rn = BSET Rx BY
Rn = BTGL Rx BY Ry
Rn = BTGL Rx BY
BTST Rx BY Ry
BTST Rx BY
Rn = FDEP Rx BY Ry
Rn = FDEP Rx BY
Rn = Rn OR FDEP Rx BY Ry
Rn = Rn OR FDEP Rx BY
Rn = FDEP Rx BY Ry (SE)
Rn = FDEP Rx BY
Rn = Rn OR FDEP Rx BY Ry (SE)
Rn = Rn OR FDEP Rx BY
Rn = FEXT Rx BY Ry
Rn = FEXT Rx BY
Rn = FEXT Rx BY Ry (SE)
Rn = FEXT Rx BY
Rn = EXP Rx
Rn = EXP Rx (EX)
Rn = LEFTZ Rx
Rn = LEFTO Rx
Rn, Rx, Ry
R15-R0; register file location, fixed-point