SH7041A datasheet(291/923 Pages) RENESAS

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SH7041A 데이터시트(PDF) 291 Page - Renesas Technology Corp

부품명	SH7041A

상세설명	Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

PDF	923 Pages

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제조업체	RENESAS [Renesas Technology Corp]

홈페이지	http://www.renesas.com

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291 / 923 page

253

Burst Mode, Dual Address, and Level Detection:

DREQ sampling timing in burst mode with

dual address and level detection is virtually the same as that of cycle steal mode.

For example, DMAC transfer begins (figure 11.19), at the earliest, three cycles after the timing of

the first sampling. The second sampling also begins from the start of the transfer one bus cycle

before the start of the first DMAC transfer. In burst mode, as long as transfer requests are issued,

DMAC transfer continues. Therefore, the “transfer one bus cycle before the start of the DMAC

transfer” may be a DMAC transfer.

In burst mode, the DACK output period is the same as that of cycle steal mode. Figure 11.20

shows the normal operation of this burst mode.

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