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SH7021 Datasheet(PDF) 156 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) 156 Page - Renesas Technology Corp

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138 RENESAS
CK
A21–A0
RAS
CAS
WRH
, WRL
AD15–AD0
Tp
Write
WRH
, WRL
AD15–AD0
Read
Tr
Tc1
Row address
Column address
Tc2
Figure 8.18 Long Pitch Access Timing
8.5.3
Wait State Control
Precharge State Control: When the microprocessor clock frequency is raised and the cycle
period shortened, 1 cycle may not always be sufficient for the precharge time for the
RAS signal
when the DRAM is accessed. The BSC allows the precharge cycle to be set to 1 state or 2 states
using the
RAS signal precharge cycles bit (TPC) of the DCR. When the TPC bit is 0, the
precharge cycle is 1 state; when TPC is 1, the precharge cycle is 2 states. Figure 8.19 shows the
timing when the precharge cycle is 2 states.



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