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SH7721 bảng dữ liệu(PDF) 430 Page - Renesas Technology Corp

tên linh kiện SH7721
Giải thích chi tiết về linh kiện  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
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Section 9
Bus State Controller (BSC)
Rev. 3.00 Jan. 18, 2008 Page 368 of 1458
REJ09B0033-0300
When bank active mode is set, if only accesses to the respective banks in the area 3 space are
considered, as long as accesses to the same row address continue, the operation starts with the
cycle in figure 9.19 or 9.22, followed by repetition of the cycle in figure 9.20 or 9.23. An access to
a different area during this time has no effect. If there is an access to a different row address in the
bank active state, after this is detected the bus cycle in figure 9.21 or 9.24 is executed instead of
that in figure 9.20 or 9.23. In bank active mode, too, all banks become inactive after a refresh
cycle or after the bus is released as the result of bus arbitration.
Tc4
CKIO
A25 to A0
CSn
RD/
WR
RAS
DQMxx
D31 to D0
BS
DACKn*2
Tr
Tc2
Tc3
Tc1
Td4
Td2
Td3
Td1
Tde
A12/A11*1
CAS
1. Address pin to be connected to the A10 pin of SDRAM.
2. The waveform for DACKn is when active low is specified.
Notes:
Figure 9.19
Burst Read Timing (No Auto-Precharge)



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