Rev. 2.00, 09/03, page 214 of 690
7.8.4
Single Read
A read access ends in one cycle when data exists in non-cacheable region and the data bus width is
larger than or equal to access size. As the burst length is set to 1 in synchronous DRAM burst
read/single write mode, only the required data is output. Consequently, no unnecessary bus cycles
are generated even when a cache-through area is accessed.
Figure 7.17 shows the basic timing chart for single read.
CKIO
A25 to A0
CSn
RD/
WR
RASU/L
DQMxx
*
2
D31 to D0
BS
Tap
DACKn
*
3
Tr
Tc1
Tde
Td1
Tw
A12/A11
*
1
CASU/L
Notes: 1. Address pin to be connected to the A10 pin of SDRAM.
2. xx is UU, UL, LU, or LL
3. The waveform for DACKn is when active low is specified.
Figure 7.17 Basic Timing for Single Read (Auto Precharge)
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