HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 173

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

3.1.11
When an identical destination operand is specified with multiple parallel instructions, data conflict
occurs. Table 3.14 shows the correspondence between each operand and registers.
Table 3.14 Correspondence between Operands and Registers
Notes: 1. Registers available for operands
There are three cases of operand conflict problems.
1. When ALU and multiply instructions specify the same destination operand (Du and Dg)
2. When X-memory load and ALU instructions specify the same destination operand (Dx, Du,
3. When Y-memory load and ALU instructions specify the same destination operand (Dy, Du,
In these cases above, the result is not guaranteed.
DSP
Registers
and Dz)
and Dz)
2. Registers available for operands (when there is operand conflict)
Operand Conflict
A0
A1
M0
M1
X0
X1
Y0
Y1
Ax
X-Memory
Load
Ix
Dx
*
*
2
2
Ay
Y-Memory
Load
Iy
Dy
*
*
2
2
Sx
6-Instruction
*
*
*
*
1
1
1
1
ALU
Sy
*
*
*
*
1
1
1
1
Rev. 4.00 Sep. 14, 2005 Page 123 of 982
Du
*
*
*
*
2
2
2
2
Se
3-Instruction
*
*
*
*
1
1
1
1
Multiply
Sf
*
*
*
*
1
1
1
1
Section 3 DSP Operation
Dg
*
*
*
*
2
2
1
1
REJ09B0023-0400
Sx
3-Instruction
*
*
*
*
1
1
1
1
ALU
Sy
*
*
*
*
1
1
1
1
Dz
*
*
*
*
*
*
*
*
1
1
1
1
2
2
2
2