參數(shù)資料
型號(hào)： HYE25L256160AC-75
廠商： INFINEON TECHNOLOGIES AG
英文描述： SMP(M)PIN CONT,PCB REAR MNT
中文描述： 256兆移動(dòng)RAM
文件頁(yè)數(shù)： 13/55頁(yè)
文件大?。?/td> 1053K
代理商： HYE25L256160AC-75
Data Sheet
13
V1.1, 2003-04-16
HYE25L256160AC
256-Mbit Mobile-RAM
Functional Description
3.3
Extended Mode Register
The Extended Mode Register controls functions beyond those controlled by the Mode Register. These additional
functions are unique to Mobile RAMs and includes a refresh period field (TCSR) for Temperature Compensated
Self Rrefresh and a Partial Array Self Refresh field (PASR).
The Extended Mode Register is programmed via the Mode Register Set command (with BA0 = 0 and BA1 = 1)
and retains the stored information until it is programmed again or the device looses 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 operation. Violating either these requirements result in unspecified operation. Unused bit A12 to
A5 have to be programmed to “0”.
3.3.1
The PASR field is a power saving feature specific to Mobile-RAMs and is used to specify whether only one quarter
or half of bank 0, one bank (bank 0), two banks (banks 0 + 1) or all four banks (default) of the SDRAM array are
enabled for Self Refresh. Disabled banks will not be refreshed in Self Refresh mode and written data will get lost
after a period defined by
t
REF
.
Partial Array Self Refresh
3.3.2
DRAM devices store data as electrical charge in tiny capacitors that require a periodic refresh in order to retain
the stored information. This refresh requirment heavily depends on the die temperatur: high temperature
corresponds to short refresh period, and low temperature to long refresh period.
The Mobile-RAM is equipped with an on-chip temperature sensor which continuously monitors the current die
temperature and adjusts the refresh period in self refresh mode accordingly. By default the on-chip temperature
sensor is enabled (TCSR = 00, see
Table "EMR" on Page 14
); the other three TCSR settings use defined
temperature values to adjust the self refresh period to with the on-chip temperature sensor being disabled.
Temperature Compensated Self Refresh with On-Chip Temperature Sensor
相關(guān)PDF資料
PDF描述
HYE25L256160AF-7.5 BJAWBMSpecialty DRAMs Mobile-RAM
HYE25L256160AC 256-Mbit Mobile-RAM
HYE25L256160AC-8 256-Mbit Mobile-RAM
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HYE25L256160AC-8 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:256-Mbit Mobile-RAM
HYE25L256160AF 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:256MBit Mobile-RAM
HYE25L256160AF-7.5 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:BJAWBMSpecialty DRAMs Mobile-RAM
HYE25L256160AF-75 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:256MBit Mobile-RAM
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