参数资料
型号: HY5PS1G421M-C4
厂商: HYNIX SEMICONDUCTOR INC
元件分类: DRAM
英文描述: 1Gb DDR2 SDRAM(DDP)
中文描述: 256M X 4 DDR DRAM, 0.5 ns, PBGA63
封装: FBGA-63
文件页数: 53/79页
文件大小: 1109K
代理商: HY5PS1G421M-C4
Rev. 0.2 / Oct. 2005
53
1
HY5PS12421(L)M
HY5PS12821(L)M
2.10 Asynchronous CKE Low Event
DRAM requires CKE to be maintained “HIGH” for all valid operations as defined in this data sheet. If CKE asyn-
chronously drops “LOW” during any valid operation DRAM is not guaranteed to preserve the contents of array. If
this event occurs, memory controller must satisfy DRAM timing specification tDelay before turning off the clocks.
Stable clocks must exist at the input of DRAM before CKE is raised “HIGH” again. DRAM must be fully re-initial-
ized (steps 4 thru 13) as described in initializaliation sequence. DRAM is ready for normal operation after the ini-
tialization sequence. See AC timing parametric table for tDelay specification
tCK
CK
CK#
tDelay
CKE
CKE asynchronously drops low
Clocks can be turned
off after this point
Stable clocks
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