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Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 315 of 982
REJ09B0023-0400
Bit Bit
Name
Initial
Value R/W Description
13
DEEP
0
R/W
Deep Power-Down Mode
This bit is valid for low-power SDRAM. If the RFSH or
RMODE bit is set to 1 while this bit is set to 1, the deep
power-down entry command is issued and the low-
power SDRAM enters the deep power-down mode.
0: Self-refresh mode
1: Deep power-down mode
12 SLOW 0 R/W
Low-Frequency
Mode
Specifies the output timing of command, address, and
write data for SDRAM and the latch timing of read data
from SDRAM. Setting this bit makes the hold time for
command, address, write and read data extended for
half cycle (output or read at the falling edge of CKIO).
This mode is suitable for SDRAM with low-frequency
clock.
0: Command, address, and write data for SDRAM is
output at the rising edge of CKIO. Read data from
SDRAM is latched at the rising edge of CKIO.
1: Command, address, and write data for SDRAM is
output at the falling edge of CKIO. Read data from
SDRAM is latched at the falling edge of CKIO.
11 RFSH 0 R/W
Refresh
Control
Specifies whether or not the refresh operation of the
SDRAM is performed.
0: No refresh
1: Refresh
10 RMODE
0 R/W
Refresh
Control
Specifies whether to perform auto-refresh or self-
refresh when the RFSH bit is 1. When the RFSH bit is
1 and this bit is 1, self-refresh starts immediately.
When the RFSH bit is 1 and this bit is 0, auto-refresh
starts according to the contents that are set in registers
RTCSR, RTCNT, and RTCOR.
0: Auto-refresh is performed
1: Self-refresh is performed
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...