HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 197

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

3.5.7
Figure 3.16 shows the multiply operation flow. Table 3.25 shows the variation of this type of
operation and table 3.26 shows the correspondence between each operand and registers. The
multiply operation of the DSP unit is single-word signed single-precision multiplication. These
operations are executed in the DSP stage, as shown in figure 3.10. The DSP stage is the same
stage as the MA stage in which memory access is performed.
If a double-precision multiply operation is needed, the CPU standard double-word multiply
instructions can be made of use.
Table 3.25 Variation of Fixed-Point Multiply Operation
Mnemonic
PMULS
Fixed-Point Multiply Operation
Function
Signed multiplication
39
Figure 3.16 Fixed-Point Multiply Operation Flow
31
S
0
Source 1
39
31
S
MAC
Destination
0
Source 1
Se
39
1 0
0
31
S
Source 2
Rev. 3.00 Jan. 18, 2008 Page 135 of 1458
Source 2
Sf
Ignored
Section 3 DSP Operating Unit
0
REJ09B0033-0300
Destination
Dg