Table 3.1 Variation Of Alu Fixed-Point Operations; Table 3.2 Correspondence Between Operands And Registers - Renesas HD6417641 Hardware Manual

Section 3 DSP Operation
Table 3.1 Variation of ALU Fixed-Point Operations
Mnemonic Function
PADD Addition
PSUB Subtraction
PADDC Addition with carry
PSUBC Subtraction with borrow
PCMP Comparison
PCOPY Data copy
PABS Absolute
PNEG Negation
PCLR Clear
Table 3.2 Correspondence between Operands and Registers
Register Sx
A0 Yes
A1 Yes
M0 —
M1 —
X0 Yes
X1 Yes
Y0 —
Y1 —
As shown in figure 3.2, data loaded from the memory at the MA stage, which is programmed at
the same line as the ALU operation, is not used as a source operand for this operation, even
though the destination operand of the data load operation is identical to the source operand of the
ALU operation. In this case, previous operation results are used as the source operands for the
ALU operation, and then updated as the destination operand of the data load operation.
Rev. 4.00 Sep. 14, 2005 Page 100 of 982
REJ09B0023-0400
Source 1
Sx
Sx
Sx
Sx
Sx
Sx
All 0
Sx
All 0
Sx
All 0
All 0
Sy Dz
— Yes
— Yes
Yes Yes
Yes Yes
— Yes
— Yes
Yes Yes
Yes Yes
Source 2 Destination
Sy Dz (Du)
Sy Dz (Du)
Sy Dz
Sy Dz
Sy —
All 0 Dz
Sy Dz
All 0 Dz
Sy Dz
All 0 Dz
Sy Dz
All 0 Dz
Du
Yes
Yes
—
—
Yes
—
Yes
—