参数资料
型号: MT42L256M32D4MG-25 IT:A
厂商: Micron Technology Inc
文件页数: 67/164页
文件大小: 0K
描述: IC LPDDR2 SDRAM 8GBIT 134FBGA
标准包装: 1,000
格式 - 存储器: RAM
存储器类型: 移动 LPDDR2 SDRAM
存储容量: 8G(356M x 32)
速度: 400MHz
接口: 并联
电源电压: 1.14 V ~ 1.3 V
工作温度: -25°C ~ 85°C
封装/外壳: 134-TFBGA
供应商设备封装: 134-FBGA(11.5x11.5)
包装: 散装
2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
Write Data Mask
Figure 45: Burst READ Truncated by BST – RL = 3, BL = 16
T0
T1
T2
T3
T4
T5
T6
T7
T8
CK#
CK
RL = 3
CA[9:0]
Bank n
col addr a
Col addr a
CMD
READ
NOP
NOP
NOP
BST
NOP
NOP
NOP
NOP
RL × t CK + t DQSCK + t DQSQ
DQS#
DQS
DQ
D OUT A0
D OUT A1
D OUT A2
D OUT A3
D OUT A4
D OUT A5
D OUT A6
D OUT A7
BST prohibited
Transitioning data
Notes:
1. The BST command truncates an ongoing READ burst (RL × t CK + t DQSCK + t DQSQ) after
the rising edge of the clock where the BST command is issued.
2. BST can only be issued an even number of clock cycles after the READ command.
3. Additional BST commands are not supported after T4 and must not be issued until after
the next READ or WRITE command.
Write Data Mask
On LPDDR2 devices, one write data mask (DM) pin for each data byte (DQ) is suppor-
ted, consistent with the implementation on LPDDR SDRAM. Each DM can mask its re-
spective DQ for any given cycle of the burst. Data mask timings match data bit timing,
but are inputs only. Internal data mask loading is identical to data bit loading to ensure
matched system timing.
Figure 46: Data Mask Timing
DQS
DQS#
DQ
V IH(AC)
t DS
t DH
V IH(DC) V IH(AC)
t DS
t DH
V IH(DC)
DM
V IL(AC)
V IL(DC) V IL(AC)
V IL(DC)
Don’t Care
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
67
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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