SH7721 datasheet(197/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 3 DSP Operating Unit

Rev. 3.00 Jan. 18, 2008 Page 135 of 1458

REJ09B0033-0300

3.5.7

Fixed-Point Multiply Operation

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.

Source 1

1 0

MAC

Ignored

Source 2

Destination

Figure 3.16 Fixed-Point Multiply Operation Flow

Table 3.25

Variation of Fixed-Point Multiply Operation

Mnemonic

Function

Source 1

Source 2

Destination

PMULS

Signed multiplication

SH7721 Datasheet(PDF) 197 Page - Renesas Technology Corp