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★ HARDWARE Manual ★ SCU User's Manual
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SCU User's Manual/Chapter 4 DSP Control Arithmetic instruction
ALU control command
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NOP
- Operation details
- The ALU instruction section will be unprocessed.
- descriptive formula
- label: NOP
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | ０ | ０ | ０ | ０ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- No change.
- remarks
- none.
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AND
- Operation details
- Performs the AND of [ACL] and [PL].
- descriptive formula
- label: AND
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | ０ | ０ | ０ | １ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S: 1 when the operation result is negative, 0 otherwise.
- Z: 1 when the operation result is 0, otherwise 0.
- C;It will be 0.
- remarks
- none.
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OR
- Operation details
- Performs the logical OR of [ACL] and [PL].
- descriptive formula
- label: OR
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | ０ | ０ | １ | ０ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S: 1 when the operation result is negative, 0 otherwise.
- Z: 1 when the operation result is 0, otherwise 0.
- C;It will be 0.
- remarks
- none.
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XOR
- Operation details
- Take the exclusive sum of [ACL] and [PL].
- descriptive formula
- label: XOR
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | ０ | ０ | １ | １ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S: 1 when the operation result is negative, 0 otherwise.
- Z: 1 when the operation result is 0, otherwise 0.
- C;It will be 0.
- remarks
- none.
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ADD
- Operation details
- Add [ACL] and [PL].
- descriptive formula
- label: ADD
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | ０ | １ | ０ | ０ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S: 1 when the operation result is negative, 0 otherwise.
- Z: 1 when the operation result is 0, otherwise 0.
- C: It is 1 when a carry occurs in the operation result, and 0 otherwise.
- V; 1 when the operation result is an overflow (over 48 bits); otherwise 0.
- remarks
- none.
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SUB
- Operation details
- Subtract [ACL] and [PL].
- descriptive formula
- label: SUB
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | ０ | １ | ０ | １ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S: 1 when the operation result is negative, 0 otherwise.
- Z: 1 when the operation result is 0, otherwise 0.
- C: It is 1 when a carry occurs in the operation result, and 0 otherwise.
- V; 1 when the operation result is an underflow, 0 otherwise.
- remarks
- none.
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AD2
- Operation details
- Add [ACH][ACL] and [PH][PL].
- descriptive formula
- label: AD2
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | ０ | １ | １ | ０ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S: 1 when the operation result is negative, 0 otherwise.
- Z: 1 when the operation result is 0, otherwise 0.
- C: It is 1 when a carry occurs in the operation result, and 0 otherwise.
- V; 1 when the operation result overflows (exceeds 48 bits); otherwise 0.
- remarks
- none.
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S.R.
- Operation details
- Shift the value of [ACL] to the right by 1 bit and store the value of bit0 in the C flag.
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- descriptive formula
- label: SR
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | １ | ０ | ０ | ０ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S;When the MSB of the operation result is 1, it becomes 1, and when it is 0, it becomes 0.
- Z: 1 when the operation result is 0, otherwise 0.
- C;When the value of b0 in the input data is 1, it becomes 1, and when it is 0, it becomes 0.
- ACL: Shift 1 bit to the right, the most significant bit (b31) remains unchanged.
- remarks
- none.
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RR
- Operation details
- Rotates the value of [ACL] to the right by 1 bit.
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- descriptive formula
- label: RR
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | １ | ０ | ０ | １ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S;When the MSB of the operation result is 1, it becomes 1, and when it is 0, it becomes 0.
- Z: 1 when the operation result is 0, otherwise 0.
- C;When the value of b0 in the input data is 1, it becomes 1, and when it is 0, it becomes 0.
- ACL: Shift 1 bit to the right, the least significant bit (b0) moves to the most significant bit (b31).
- remarks
- none.
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SL
- Operation details
- Shift the value of [ACL] to the left by 1 bit.
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- descriptive formula
- label: SL
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | １ | ０ | １ | ０ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S;When the MSB of the operation result is 1, it becomes 1, and when it is 0, it becomes 0.
- Z: 1 when the operation result is 0, otherwise 0.
- C;When the value of b31 in the input data is 1, it becomes 1, and when it is 0, it becomes 0.
- ACL: Shift 1 bit to the left, and the least significant bit (b0) becomes 0.
- remarks
- none.
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R.L.
- Operation details
- Rotates the [ACL] value to the left by 1 bit.
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- descriptive formula
- label: RL
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | １ | ０ | １ | １ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S;When the MSB of the operation result is 1, it becomes 1, and when it is 0, it becomes 0.
- Z: 1 when the operation result is 0, otherwise 0.
- C;When the value of b31 in the input data is 1, it becomes 1, and when it is 0, it becomes 0.
- ACL: Shift 1 bit to the left, the most significant bit (b31) moves to the least significant bit (b0).
- remarks
- none.
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RL8
- Operation details
- Rotate the [ACL] value by 8 bits to the left.
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- descriptive formula
- label: RL8
- instruction code
| 31 | | | | | 26 | | |
| | | | | | | |
| | | | | | | |
| | | | | | | ０ |
| ０ | ０ | １ | １ | １ | １ | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
− | − | − | − | − | − | − | − |
-
- flag
- S;When the MSB of the operation result is 1, it becomes 1, and when it is 0, it becomes 0.
- Z: 1 when the operation result is 0, otherwise 0.
- C;When the value of b24 in the input data is 1, it becomes 1, and when it is 0, it becomes 0.
- ACL; Rotate left by 8 bits.
- remarks
- none.
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★ HARDWARE Manual ★ SCU User's Manual
Copyright SEGA ENTERPRISES, LTD., 1997
