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Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 369 of 982
REJ09B0023-0400
Tc1
Tr
Td1
Tde
Tap
Tr
Tc1
Tnop
Trwl
Tap
(High)
CKIO
CKE
A25 to A0
CSn
RD/
WR
RASL
,
RASU
DQMxx
D31 to D0
BS
DACKn
*
2
A12/A11
*
1
CASL
,
CASU
Notes: 1. Address pin to be connected to pin A10 of SDRAM.
2. The waveform for
DACKn
is when active low is specified.
Figure 12.31 Low-Frequency Mode Access Timing
Power-Down Mode: If the PDOWN bit in the SDCR register is set to 1, the SDRAM is placed in
the power-down mode by bringing the CKE signal to the low level in the non-access cycle. This
power-down mode can effectively lower the power consumption in the non-access cycle.
However, please note that if an access occurs in the power-down mode, a cycle of overhead occurs
because a cycle is needed to assert the CKE in order to cancel the power-down mode.
Figure 12.32 shows the access timing in the power-down mode.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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Page 1036: ...SH7641 Hardware Manual...