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參數(shù)資料

型號(hào)：	HYB25D256160BTL-7F
廠商：	INFINEON TECHNOLOGIES AG
英文描述：	256-Mbit Double Data Rate SDRAM, Die Rev. B
中文描述：	256兆雙倍數(shù)據(jù)速率SDRAM，模具版本B
文件頁(yè)數(shù)：	14/77頁(yè)
文件大小：	1779K
代理商：	HYB25D256160BTL-7F

HYB25D256[400/800/160]B[T/C](L)

256-Mbit Double Data Rate SDRAM, Die Rev. B

Page 14 of 77

2003-01-09, V1.1

Extended Mode Register

The Extended Mode Register controls functions beyond those controlled by the Mode Register; these addi-

tional functions include DLL enable/disable, and output drive strength selection (optional). These functions

are controlled via the bits shown in the Extended Mode Register Definition. The Extended Mode Register is

programmed via the Mode Register Set command (with BA0 = 1 and BA1 = 0) and retains the stored informa-

tion until it is programmed again or the device loses power. The Extended Mode Register must be loaded

when all banks are idle, and the controller must wait the specified time before initiating any subsequent oper-

ation. Violating either of these requirements result in unspecified operation.

DLL Enable/Disable

The DLL must be enabled for normal operation. DLL enable is required during power up initialization, and

upon returning to normal operation after having disabled the DLL for the purpose of debug or evaluation. The

DLL is automatically disabled when entering self refresh operation and is automatically re-enabled upon exit

of self refresh operation. Any time the DLL is enabled, 200 clock cycles must occur before a Read command

can be issued. This is the reason 200 clock cycles must occur before issuing a Read or Write command upon

exit of self refresh operation.

Output Drive Strength

The normal drive strength for all outputs is specified to be SSTL_2, Class II. In addition this design version

supports a weak driver mode for lighter load and/or point-to-point environments which can be activated during

mode register set. I-V curves for the normal and weak drive strength are included in this document.

相關(guān)PDF資料	PDF描述
HYB25D256160BTL-8	256-Mbit Double Data Rate SDRAM, Die Rev. B
HYB25D256400BC-7F	256-Mbit Double Data Rate SDRAM, Die Rev. B
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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HYB25D256160BTL-8	制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:256 Mbit Double Data Rate SDRAM
HYB25D256160CC-5	制造商:QIMONDA 制造商全稱:QIMONDA 功能描述:256-Mbit Double-Data-Rate SDRAM
HYB25D256160CC-6	制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:256 Mbit Double Data Rate SDRAM
HYB25D256160CE-5	制造商:QIMONDA 制造商全稱:QIMONDA 功能描述:256-Mbit Double-Data-Rate SDRAM
HYB25D256160CE-5A	制造商:QIMONDA 制造商全稱:QIMONDA 功能描述:256-Mbit Double-Data-Rate SDRAM

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