Renesas SH7781 - Manual (Page 566)

12. DDR2-SDRAM Interface (DBSC2)
Rev.1.00 Jan. 10, 2008 Page 536 of 1658
REJ09B0261-0100
example is shown in section 12.5.11, Method for Securing Time Required for Initialization, Self-
Refresh Cancellation, etc.
RSHX
MCK0,
MCK1
MA[14:11]
MA[9:0]
MBA[2:0]
MCKE
MCS
MRAS
MCAS
MWE
MA[10]
Invalid
MDQS[3:0]
MDQ[31:0]
MDM[3:0] Invalid
Invalid
Invalid
Invalid
PALL
Invalid
SLFRSH SDRAM
command SLF
REF REF
tXSNR
Self-refresh in progress
Figure 12.13 Self-Refresh Operation
(2)
Regarding Timing Constraints
Figure 12.14 shows the relation between the settings of CL, tRAS, tRCD, and tRP, and the issuing
of commands. Figure 12.15 shows the relation to tRRD and tRTP, figure 12.16 shows the relation
to tWR, figure 12.17 shows the relation to tRC, figure 12.18 shows the relation to READ-WRITE,
figure 12.19 shows the relation to WRITE-READ, and figure 12.20 shows the relation to tRFC.
Figure 12.14 corresponds to operation in a case in which, with bank A open, there is read access of
bank A and a page miss occurs. The constraint tRP between the PRE command and ACT