SH7763 Datasheet, PDF (498/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 12 DDR-SDRAM Interface (DDRIF)
12.5.3 Supported DDR-SDRAM Commands
Table 12.6 shows the DDR-SDRAM commands supported by the DDRIF.
Table 12.6 DDR-SDRAM Commands Issued by DDRIF
Function
Symbol CKEn − 1 CKEn CS RAS CAS WE
Device deselect
DESL
H
X
H
X
X
X
No operation
NOP
H
X
L
H
H
H
Read
READ
H
X
L
H
L
H
Read with auto precharge READA H
X
L
H
L
H
Write
WRITE H
X
L
H
L
L
Write with auto precharge WRITEA H
X
L
H
L
L
Bank activate
ACT
H
X
L
L
H
H
Precharge select bank PRE
H
X
L
L
H
L
Precharge all banks
PREALL H
X
L
L
H
L
Auto refresh
REFA
H
H
L
L
L
H
Self-refresh entry from REFS
H
IDLE
L
L
L
L
H
Self-refresh exit
REFSX L
H
H
X
X
X
Power-down entry
PWRDN H
L
H
X
X
X
Power-down exit
PWRDNX L
H
H
X
X
X
Mode register set
MRS/
H
EMRS
X
L
L
L
L
[Legend]
H: High level
L: Low level
X: High level or low level (either is acceptable)
V: Valid data
MA13
BA1
to
AP and
MA11 (MA10) BA0
X
X
X
X
X
X
V
L
V
V
H
V
V
L
V
V
H
V
V
V
V
X
L
V
X
H
X
X
X
X
X
X
X
MA9 to
MA0
X
X
V
V
V
V
V
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
V
V
V
V
The DESL command in table 12.6 is issued when the DDR-SDRAM is not accessed by modules.
The DESL command therefore cannot be issued by the user.
Rev. 1.00 Oct. 01, 2007 Page 432 of 1956
REJ09B0256-0100