您的位置：维库电子市场网 > Datasheet > HYB25D256800CL-6

HYB25D256800CL-6 Datasheet

  • HYB25D256800CL-6

  • 256 Mbit Double Data Rate SDRAM

  • 3260.54KB

  • 94页

  • INFINEON   INFINEON

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

HYB25D256[16/40/80]0C[E/C/F/T](L)
256 Mbit Double-Data-Rate SDRAM
Functional Description
3.4
Deselect
Commands
The Deselect function prevents new commands from being executed by the DDR SDRAM. The DDR SDRAM is
effectively deselected. Operations already in progress are not affected.
No Operation (NOP)
The No Operation (NOP) command is used to perform a NOP to a DDR SDRAM. This prevents unwanted
commands from being registered during idle or wait states. Operations already in progress are not affected.
Mode Register Set
The mode registers are loaded via inputs A0-A12, BA0 and BA1. See mode register descriptions in
Chapter 3.2.
The Mode Register Set command can only be issued when all banks are idle and no bursts are in progress. A
subsequent executable command cannot be issued until
t
MRD
is met.
Active
The Active command is used to open (or activate) a row in a particular bank for a subsequent access. The value
on the BA0, BA1 inputs selects the bank, and the address provided on inputs A0-A12 selects the row. This row
remains active (or open) for accesses until a Precharge (or Read or Write with Auto Precharge) is issued to that
bank. A Precharge (or Read or Write with Auto Precharge) command must be issued and completed before
opening a different row in the same bank.
Read
The Read command is used to initiate a burst read access to an active (open) row. The value on the BA0, BA1
inputs selects the bank, and the address provided on inputs A0-Ai, Aj (where [i = 8, j = don鈥檛 care] for x16, [i = 9,
j = don鈥檛 care] for x8 and [i = 9, j = 11] for x4) selects the starting column location. The value on input A10
determines whether or not Auto Precharge is used. If Auto Precharge is selected, the row being accessed is
precharged at the end of the Read burst; if Auto Precharge is not selected, the row remains open for subsequent
accesses.
Write
The Write command is used to initiate a burst write access to an active (open) row. The value on the BA0, BA1
inputs selects the bank, and the address provided on inputs A0-Ai, Aj (where [i = 9, j = don鈥檛 care] for x8; where
[i = 9, j = 11] for x4) selects the starting column location. The value on input A10 determines whether or not Auto
Precharge is used. If Auto Precharge is selected, the row being accessed is precharged at the end of the Write
burst; if Auto Precharge is not selected, the row remains open for subsequent accesses. Input data appearing on
the DQs is written to the memory array subject to the DM input logic level appearing coincident with the data. If a
given DM signal is registered low, the corresponding data is written to memory; if the DM signal is registered high,
the corresponding data inputs are ignored, and a Write is not executed to that byte/column location.
Precharge
The Precharge command is used to deactivate (close) the open row in a particular bank or the open row(s) in all
banks. The bank(s) will be available for a subsequent row access a specified time (
t
RP
) after the Precharge
command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where
only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as 鈥淒on鈥檛
Care鈥? Once a bank has been precharged, it is in the idle state and must be activated prior to any Read or Write
commands being issued to that bank. A precharge command is treated as a NOP if there is no open row in that
bank, or if the previously open row is already in the process of precharging.
Data Sheet
27
Rev. 1.6, 2004-12

HYB25D256800CL-6相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2024 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：

0571-85317607

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！