Renesas HD6417641 - Figure 25.37 Synchronous DRAM Auto-Refreshing Timing (WTRP = 1 Cycle, WTRC = 3 Cycles)

Section 25 Electrical Characteristics
Rev. 4.00 Sep. 14, 2005 Page 949 of 982
REJ09B0023-0400
Trc TrcTrrTpwTp Trc
t
CSD1
t
AD1
t
AD1
t
RWD1
t
RWD1
t
RWD1
t
CSD1
t
CSD1
t
CSD1
t
RASD1
t
RASD1
t
RASD1
t
RASD1
t
AD1
t
AD1
t
CASD1
t
CASD1
(High)
(Hi-Z)*
3
CKIO
A25 to A0
CSn
RD/WR
A12/A11*
1
D31 to D0
RASU/L
CASU/L
BS
CKE
DQMxx
DACKn*
2
Note:
1. An address pin to be connected to pin A10 of SDRAM.
2. Waveform for DACKn when active low is selected.
3. Pins D31 to D16 with weak keeper are retained as weak keepers.
Figure 25.37 Synchronous DRAM Auto-Refreshing Timing
(WTRP = 1 Cycle, WTRC = 3 Cycles)