Analog Devices ADSP-21020 Specification Sheet page 10

ADSP-21020
Rn = Rx * Ry ( S S F
MRF = Rx * Ry ( U U I
MRB = Rx * Ry ( U U
Rn = MRF + Rx * Ry ( S S F
Rn = MRB + Rx * Ry (
MRF = MRF + Rx * Ry ( U U
MRB = MRB
Rn = SAT MRF (SI)
Rn = SAT MRB (UI)
MRF = SAT MRF (SF)
MRB = SAT MRB (UF)
MRF = 0
MRB
MRxF = 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
Rn = LSHIFT Rx BY Ry
Rn = Rn OR LSHIFT Rx BY Ry
Rn = ASHIFT Rx BY Ry
Rn = Rn OR ASHIFT Rx BY Ry
Rn = ROT Rx BY RY
Rn = BCLR Rx BY Ry
Rn = BSET Rx BY Ry
Rn = BTGL Rx BY Ry
BTST Rx BY Ry
Rn = FDEP Rx BY Ry
Rn = Rn OR FDEP Rx BY Ry
Rn = FDEP Rx BY Ry (SE)
Rn = Rn OR FDEP Rx BY Ry (SE)
Rn = FEXT Rx BY Ry
Rn = FEXT Rx BY Ry (SE)
Rn = EXP Rx
Rn = EXP Rx (EX)
Rn = LEFTZ Rx
Rn = LEFTO Rx
Rn, Rx, Ry R15-R0; register file location, fixed-point
<bit6>:<len6> 6-bit immediate bit position and length values (for shifter immediate operations)
Table V. Multiplier Compute Operations
) Fn
FR
) Rn
U U I Rn
FR MRF =
MRB = MRB
Rn
Rn
MRF = RND MRF
MRB = RND MRB
Rn
Rn
Shifter Immediate
Rn = LSHIFT Rx BY<data8>
Rn = Rn OR LSHIFT Rx BY<data8>
Rn = ASHIFT Rx BY<data8>
Rn = Rn OR ASHIFT Rx BY<data8>
Rn = ROT Rx BY<data8>
Rn = BCLR Rx BY<data8>
Rn = BSET Rx BY<data8>
Rn = BTGL Rx BY<data8>
BTST Rx BY<data8>
Rn = FDEP Rx BY <bit6>: <len6>
Rn = Rn OR FDEP Rx BY <bit6>:<1en6>
Rn = FDEP Rx BY <bit6>:<1en6> (SE)
Rn = Rn OR FDEP Rx BY <bit6>:<1en6> (SE)
Rn = FEXT Rx BY <bit6>:<1en6>
Rn = FEXT Rx BY <bit6>:<1en6> (SE)
= Fx * Fy
= MRF – Rx * Ry ( S S F
= MRB= Rx * Ry ( U U I
MRF= Rx * Ry ( U U I
= RND MRF (SF)
= RND MRB (UF)
= MRxF
= MRxB
–10–
)
FR
REV. C