参数资料
型号: W9725G6KB-25I
厂商: Winbond Electronics
文件页数: 24/87页
文件大小: 0K
描述: IC DDR2 SDRAM 256MBIT 84WBGA
标准包装: 209
格式 - 存储器: RAM
存储器类型: DDR2 SDRAM
存储容量: 256M(16Mx16)
速度: 2.5ns
接口: 并联
电源电压: 1.7 V ~ 1.9 V
工作温度: -40°C ~ 95°C
封装/外壳: 84-TFBGA
供应商设备封装: 84-WBGA(8x12.5)
包装: *
其它名称: Q7118748
W9725G6KB
-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
≥ t RCD
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
8.4.2
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.
Publication Release Date: Sep. 03, 2012
- 24 -
Revision A03
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