Analog Devices ADSP-21261 SHARC Hardware Reference Manual page 101

MODE1
X Y
MULTIPLIER
TO PROGRAM SEQUENCER
Figure 2-15. Input Registers for Multifunction Computations
(ALU and Multiplier)
• SSFR indicates the X input is signed, the Y input is signed, use
Fractional inputs, and rounded-to-nearest output
• SSF indicates the X input is signed, Y input is signed, use Frac-
tional input
Table 2-11. Dual Add and Subtract
Ra = Rx + Ry, Rs = Rx – Ry
Fa = Fx + Fy, Fs = Fx – Fy
ADSP-2126x SHARC Processor Hardware Reference
PM DATA BUS
DM DATA BUS
REGISTER FILE
(16 x 40-BIT)
R0 R8
R1 R9
R2 R10
R3 R11
R4 R12
R5 R13
R6 R14
R7 R15
MRF2 MRF1 MRF0
ASTATX STKYX
Processing Elements
NOTE THAT SHIFTER IS
NOT AVAILABLE FOR
MULTIFUNCTION INSTRUCTIONS.
Z Y X Y
SHIFTER ALU
X
2-43