HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 187
HD6417320
Manufacturer Part Number
HD6417320
Description
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417320.pdf
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3.5.4
Figure 3.9 shows the ALU arithmetic operation flow. Table 3.21 shows the variation of this type
of operation and table 3.22 shows the correspondence between each operand and registers.
Note: The ALU fixed-point arithmetic operations are basically 40-bit operation; 32 bits of the
ALU fixed-point operations are executed between registers. Each source and destination operand
are selected independently from one of the DSP registers. When a register providing guard bits is
specified as an operand, the guard bits are activated for this type of operation. 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.
base precision and 8 bits of the guard-bit parts. So the signed bit is copied to the guard-bit
parts when a register not providing the guard-bit parts is specified as the source operand.
When a register not providing the guard-bit parts is specified as a destination operand, the
lower 32 bits of the operation result are input into the destination register.
ALU Fixed-Point Arithmetic Operations
39
Guard
31
Source 1
Figure 3.9 ALU Fixed-Point Arithmetic Operation Flow
39
Guard
31
Destination
0
ALU
39
Guard
31
Source 2
0
Rev. 3.00 Jan. 18, 2008 Page 125 of 1458
DSR
0
GT Z
Section 3 DSP Operating Unit
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REJ09B0033-0300
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