Section 12 DDR-SDRAM Interface (DDRIF)
Rev.1.00 Dec. 13, 2005 Page 417 of 1286
REJ09B0158-0100
Bit Bit
Name
Initial
Value R/W Description
63 to 3
All
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
2 to 0
SMS
000
R/W
SDRAM Mode Select
These bits initialize the DDR-SDRAM when power is
supplied and after release of the reset signal. Software
can be used to set these bits as listed below so that the
corresponding command is issued.For details on the
initialization procedure, see section 12.5.2, DDR-
SDRAM Initialization Sequence. After the DDR-
SDRAM has been initialized, normal operation (000) is
specified.
000: Normal operation
001: A NOP command is issued (only valid if the DCE
bit in MIM is set to 1).
010: A PREALL command is issued (only valid if the
DCE bit in MIM is set to 1).
011: The CKE pin is enabled. At that time, the
DESELECT command is issued (only valid if the
DCE bit in MIM is set to 1).
100: The REFA (auto-refresh) command is issued (only
valid if the DCE bit in MIM is set to 1).
Settings other than the above are prohibited. If such
settings are made, correct operation is not guaranteed.
Note that the PCKE bit in MIM is used to set the CKE
pin low for reduced power consumption of the DDR-
SDRAM.
Содержание SH7780 Series
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Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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Страница 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Страница 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
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Страница 1070: ...Section 26 Serial Sound Interface SSI Module Rev 1 00 Dec 13 2005 Page 1020 of 1286 REJ09B0158 0100 ...
Страница 1104: ...Section 27 NAND Flash Memory Controller FLCTL Rev 1 00 Dec 13 2005 Page 1054 of 1286 REJ09B0158 0100 ...
Страница 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
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Страница 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Страница 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
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