參數(shù)資料
型號(hào): KBE00F005A-D411
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: 512Mb NAND*2 + 256Mb Mobile SDRAM*2
中文描述: 的512Mb的NAND * 2 256Mb的移動(dòng)SDRAM * 2
文件頁數(shù): 64/87頁
文件大?。?/td> 1353K
代理商: KBE00F005A-D411
KBE00F005A-D411
MCP MEMORY
June 2005
64
Revision 1.0
tSS
*1
tSS
*2
Auto Refresh
Command
PRE
t
RP(min)
t
ARFC(min)
Auto
Refresh
CKE = High
CMD
An auto refresh command is issued by having CS, RAS and CAS held low with CKE and WE high at the rising edge of the
clock(CLK). All banks must be precharged and idle for t
RP
(min) before the auto refresh command is applied. No control of the external
address pins is required once this cycle has started because of the internal address counter. When the refresh cycle has completed,
all banks will be in the idle state. A delay between the auto refresh command and the next activate command or subsequent auto
refresh command must be greater than or equal to the t
ARFC
(min).
CLK
A Self Refresh command is defined by having CS, RAS, CAS and CKE held low with WE high at the rising edge of the clock. Once
the self Refresh command is initiated, CKE must be held low to keep the device in Self Refresh mode. After 1 clock cycle from the self
refresh command, all of the external control signals including system clock(CLK) can be disabled except CKE. The clock is internally
disabled during Self Refresh operation to reduce power. To exit the Self Refresh mode, supply stable clock input before returning CKE
high, assert deselect or NOP command and then assert CKE high. In case that the system uses burst auto refresh during normal
opreation, it is recommended to use burst 4096 auto refresh cycle immediately before entering self refresh mode and after exiting in
self refresh mode. On the other hand, if the system uses the distributed auto refresh, the system only has to keep the refresh duty
cycle.
Self Refresh
Command
CKE
Stable Clock
t
SS
NOP
Self
Refresh
CLK
t
SRFX(min)
t
SS
ACT
10. Clock Suspend Exit & Power Down Exit
11. Auto Refresh & Self Refresh
1) Clock Suspend (=Active Power Down) Exit
2) Power Down (=Precharge Power Down) Exit
CLK
CKE
Internal
CLK
CMD
RD
CLK
CKE
Internal
CLK
CMD
NOP ACT
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