Section 12 DDR-SDRAM Interface (DDRIF)
Rev.1.00 Dec. 13, 2005 Page 426 of 1286
REJ09B0158-0100
12. Use SDMR to issue the MRS command, release the DLL reset (MA8 = low), and determine
the operating mode. In this case, use the settings for burst length, etc. that were specified in
step 10.
13. After the DLL is reset, wait for 200 cycles of the MCLK: normal memory access will then be
possible.
Ensure that the above SDMR settings, etc. of the SDRAM match the settings of the DDRIF
registers.
12.5.3 Supported
SDRAM Commands
Table 12.6 shows the SDRAM commands supported by the DDRIF.
Table 12.6 SDRAM Commands Issuable by DDRIF
Function Symbol
CKEn
−
1 CKEn
CS RAS
CAS
WE
MA13
to
MA11
AP
(MA10)
BA1
and
BA0
MA9 to
MA0
Device
deselect
DESELECT
H
X H X X X X X X X
No
operation
NOP H
X L H H H X X X X
Read
READ H
X L H L H V L V V
Read with auto precharge READA
H
X
L
H
L
H
V
H
V
V
Write
WRITE
H
X L H L L V L V V
Write with auto precharge WRITEA
H
X
L
H
L
L
V
H
V
V
Bank
activate
ACT H
X L L H H V V V V
Precharge
select
bank
PRE H
X L L H L X L V X
Precharge
all
banks PREALL
H
X L L H L X H X X
Auto
refresh
REFA H
H L L L H X X X X
Self-refresh entry from
IDLE
REFS H
L L L L H X X X X
Exit
self
refresh
REFSX
L
H H X X X X X X X
Enter
power
down
PWRDN
H
L H X X X X X X X
Exit
power
down
PWRDNX
L
H H X X X X X X X
Mode register set
MRS/
EMRS
H
X L L L L V V V V
[Legend]
H: High
level
L: Low
level
X: Don’t
care
Содержание SH7780 Series
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Страница 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Страница 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Страница 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
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 ...
Страница 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
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 ...
Страница 1004: ...Section 24 Multimedia Card Interface MMCIF Rev 1 00 Dec 13 2005 Page 954 of 1286 REJ09B0158 0100 ...
Страница 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
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 ...
Страница 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
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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