SH7708 datasheet(68/633 Pages) RENESAS

Numer części	SH7708

Szczegółowy opis	SuperH??RISC engine

PDF	633 Pages

Scroll/Zoom	100%

Producent	RENESAS [Renesas Technology Corp]

Strona internetowa	http://www.renesas.com

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68 / 633 page

2.6

Usage Note

In the SH7708R, operations may not be performed correctly when the following sequences are

executed with the cache on.

Address

Instruction

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+2

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+4

STS(.L)/LDS(.L) MACH/MACL

4n+2

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+4

NOP (or one-cycle instruction except MAC instruction*

1 or branch

instruction*

4n+6

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+8

STS(.L)/LDS(.L) MACH/MACL

Notes: 1. MULS.W, MULU.W, MAC.L, MAC.W, DMULS.L, DMULU.L, MUL.L, MULS.W,

MULU.W

2. BF, BF/S, BT, BT/S, BRA, BRAF, BSR, BSRF, JMP, JSR, RTS

Software Remedy: This problem can be avoided in either of the following ways.

1. Do not use the above sequences.

2. When performing STS/LDS on the MACL/MACH register after consecutive execution of MAC

instructions, insert an NOP instruction between the MAC instructions and STS/LDS

instruction.

SH7708 Arkusz danych(PDF) 68 Page - Renesas Technology Corp