参数资料
型号: MT42L256M32D4MG-25 IT:A
厂商: Micron Technology Inc
文件页数: 62/164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
Burst WRITE Command
every eighth clock cycle for BL = 16 operation. This operation is supported as long as the
banks are activated, whether the accesses read the same or different banks.
READs Interrupted by a READ
A burst READ can be interrupted by another READ with a 4-bit burst boundary, provi-
ded that t CCD is met.
A burst READ can be interrupted by other READs on any subsequent clock, provided
that t CCD is met.
Figure 38: READ Burst Interrupt Example – RL = 3, BL = 8, t CCD = 2
T0
T1
T2
T3
T4
T5
T6
T7
T8
CK#
CK
RL = 3
CA[9:0]
Bank n
col addr a
Col addr a
Bank n
col addr b
Col addr b
t CCD
=2
CMD
READ
NOP
READ
NOP
NOP
NOP
NOP
NOP
NOP
DQS#
DQS
DQ
D OUT A0
D OUT A1
D OUT A2
D OUT A3
D OUT B0
D OUT B1
D OUT B2
D OUT B3
D OUT B4
D OUT B5
Transitioning data
Note:
1. READs can only be interrupted by other READs or the BST command.
Burst WRITE Command
The burst WRITE command is initiated with CS# LOW, CA0 HIGH, CA1 LOW, and CA2
LOW at the rising edge of the clock. The command address bus inputs, CA5r–CA6r and
CA1f–CA9f, determine the starting column address for the burst. Write latency (WL) is
defined from the rising edge of the clock on which the WRITE command is issued to the
rising edge of the clock from which the t DQSS delay is measured. The first valid data
must be driven WL × t CK + t DQSS from the rising edge of the clock from which the
WRITE command is issued. The data strobe signal (DQS) must be driven LOW t WPRE
prior to data input. The burst cycle data bits must be applied to the DQ pins t DS prior to
the associated edge of the DQS and held valid until t DH after that edge. Burst data is
sampled on successive edges of the DQS until the 4-, 8-, or 16-bit burst length is com-
pleted. After a burst WRITE operation, t WR must be satisfied before a PRECHARGE
command to the same bank can be issued.
Pin input timings are measured relative to the crosspoint of DQS and its complement,
DQS#.
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
62
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
相关PDF资料
PDF描述
P51-300-G-H-I12-20MA-000-000 SENSOR 300PSI M12-1.5 6G 4-20MA
REC5-0509SRW/H2/A/M/SMD CONV DC/DC 5W 4.5-9VIN 09VOUT
P51-500-A-H-P-4.5OVP-000-000 SENSOR 500PSI M12-1.5 6G .5-4.5V
P51-300-A-AD-D-20MA-000-000 SENSOR 300PSI 7/16-20 UNF 4-20MA
P51-300-A-H-P-4.5OVP-000-000 SENSOR 300PSI M12-1.5 6G .5-4.5V
相关代理商/技术参数
参数描述