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W9725G6IB
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
CLK /CLK
CMD
Active
A-Bank
Read
A-Bank
Write
A-Bank
WL=RL-1=4
AL=2
CL=3
DQS/DQS
≧ tRCD
RL=AL+CL=5
DQ
Dout0 Dout1 Dout2 Dout3
Din0
Din1
Din2
Din3
[AL = 2 and CL = 3, RL = (AL + CL) = 5, WL = (RL - 1) = 4, BL = 4]
Figure 14 — Example 1: Read followed by a write to the same bank,
where AL = 2 and CL = 3, RL = (AL + CL) = 5, WL = (RL - 1) = 4, BL = 4
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
CLK/CLK
AL=0
CMD
Active
A-Bank
Read
A-Bank
Write
A-Bank
WL=RL-1=2
CL=3
DQS/DQS
≧ t RCD
RL=AL+CL=3
DQ
Dout0 Dout1 Dout2 Dout3
Din0
Din1
Din2
Din3
AL = 0 and CL = 3, RL = (AL + CL) = 3, WL = (RL - 1) = 2, BL = 4]
Figure 15 — Example 2: Read followed by a write to the same bank,
where AL = 0 and CL = 3, RL = (AL + CL) = 3, WL = (RL - 1) = 2, BL = 4
7.4.2
Burst mode operation
Burst mode operation is used to provide a constant flow of data to memory locations (write cycle), or
from memory locations (read cycle). The parameters that define how the burst mode will operate are
burst sequence and burst length. The DDR2 SDRAM supports 4 bit and 8 bit burst modes only. For 8
bit burst mode, full interleave address ordering is supported, however, sequential address ordering is
nibble based for ease of implementation. The burst length is programmable and defined by MR A[2:0].
The burst type, either sequential or interleaved, is programmable and defined by MR [A3]. Seamless
burst read or write operations are supported.
Unlike DDR1 devices, interruption of a burst read or writes cycle during BL = 4 mode operation is
prohibited. However in case of BL = 8 mode, interruption of a burst read or write operation is limited to
two cases, reads interrupted by a read, or writes interrupted by a write. (Example timing waveforms
refer to 10.13 and 10.14 Burst read and write interrupt timing diagram in Chapter 10)
Publication Release Date: Oct. 23, 2009
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Revision A04
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