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.
Summary of Contents for SH7780 Series
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Page 50: ...Rev 1 00 Dec 13 2005 Page l of l ...
Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
Page 1336: ...Rev 1 00 Dec 13 2005 Page 1286 of 1286 REJ09B0158 0100 ...
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