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SH7021 Datasheet(PDF) 185 Page - Renesas Technology Corp

Part # SH7021
Description  SuperH??RISC engine
PDF  509 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7021 Datasheet(HTML) 185 Page - Renesas Technology Corp

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RENESAS 167
2. Bus release procedure
The bus release procedure is shown in figure 8.47. Figure 8.47 shows the case where
BREQ is
input one state before the break between bus cycles so that tBRQS is satisfied. In the SH7020
and SH7021, the bus is released after the bus cycle in which
BREQ is input (if BREQ is input
between bus cycles, after the bus cycle starting next).
CK
A21 to A0
BREQ
BACK
RD, WR
RAS, CAS
CSn
tBRQS
tBRQS
tBZD
tBZD
tBACD1
tBACD1
Bus cycle
Bus cycle
Bus release
Strobe pin:
high-level output
The bus is released after the bus
cycle in which BREQ is input
(if BREQ is input between bus cycles,
after the bus cycle starting next).
Bus cycle restart
Address & data
strobe pins:
high impedance
Figure 8.47 Bus Release Procedure



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