參數(shù)資料
型號(hào)： HB52F88EM
廠商： Hitachi,Ltd.
英文描述： 64 MB Unbuffered SDRAM DIMM(64 MB 未緩沖同步DRAM DIMM)
中文描述： 64 MB的無緩沖SDRAM的內(nèi)存（64 MB的未緩沖同步的DRAM內(nèi)存）
文件頁數(shù)： 35/71頁
文件大?。?/td> 906K
代理商： HB52F88EM
HB52F88EM-75F, HB52F89EM-75F, HB52F168EN-75F, HB52F169EN-
35
CKE Truth Table
Note: H: V
IH
. L: V
IL
.
×
: V
IH
or V
IL
.
Clock suspend mode entry:
The SDRAM module enters clock suspend mode from active mode by setting
CKE to Low. The clock suspend mode changes depending on the current status (1 clock before) as shown
below.
ACTIVE clock suspend:
This suspend mode ignores inputs after the next clock by internally maintaining
the bank active status.
READ suspend and READ with Auto-precharge suspend:
The data being output is held (and continues
to be output).
WRITE suspend and WRIT with Auto-precharge suspend:
In this mode, external signals are not accept-
ed. However, the internal state is held.
Clock suspend:
During clock suspend mode, keep the CKE to Low.
Clock suspend mode exit:
The SDRAM module exits from clock suspend mode by setting CKE to High
during the clock suspend state.
IDLE:
In this state, all banks are not selected, and completed precharge operation.
Auto-refresh command [REF]:
When this command is input from the IDLE state, the SDRAM module
starts auto-refresh operation. (The auto-refresh is the same as the CBR refresh of conventional DRAMs.)
During the auto-refresh operation, refresh address and bank select address are generated inside the SDRAM
module. For every auto-refresh cycle, the internal address counter is updated. Accordingly, 4096 times are
required to refresh the entire memory. Before executing the auto-refresh command, all the banks must be in
the IDLE state. In addition, since the precharge for all banks is automatically performed after auto-refresh,
no precharge command is required after auto-refresh.
Self-refresh entry [SELF]:
When this command is input during the IDLE state, the SDRAM module starts
self-refresh operation. After the execution of this command, self-refresh continues while CKE is Low. Since
self-refresh is performed internally and automatically, external refresh operations are unnecessary.
Power down mode entry:
When this command is executed during the IDLE state, the SDRAM module en-
ters power down mode. In power down mode, power consumption is suppressed by cutting off the initial in-
put circuit.
CKE
n - 1
H
L
L
H
H
H
H
L
L
L
L
Current state
Active
Any
Clock suspend
Idle
Idle
Idle
Command
Clock suspend mode entry
Clock suspend
Clock suspend mode exit
Auto-refresh command (REF)
Self-refresh entry (SELF)
Power down entry
n
L
L
H
H
L
L
L
H
H
H
H
S
H
×
×
L
L
L
H
L
H
L
H
RE
×
×
×
L
L
H
×
H
×
H
×
CE
×
×
×
L
L
H
×
H
×
H
×
W
×
×
×
H
H
H
×
H
×
H
×
Address
×
×
×
×
×
×
×
×
×
×
×
Self refresh
Self refresh exit (SELFX)
Power down
Power down exit
相關(guān)PDF資料
PDF描述
HB52F168EN 64 MB Unbuffered SDRAM DIMM(64 MB 未緩沖同步DRAM DIMM)
HB52F169EN 64 MB Unbuffered SDRAM DIMM(64 MB 未緩沖同步DRAM DIMM)
HB52F89EM 64 MB Unbuffered SDRAM DIMM(64 MB 未緩沖同步DRAM DIMM)
HB52R1289E22 1 GB Registered SDRAM DIMM 1 GB Registered SDRAM DIMM (36 pcs of 64 M 】 4 Components) PC100 SDRAM
HB52R1289E22-A6B 1 GB Registered SDRAM DIMM 1 GB Registered SDRAM DIMM (36 pcs of 64 M 】 4 Components) PC100 SDRAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HB52R1289E22 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:1 GB Registered SDRAM DIMM 1 GB Registered SDRAM DIMM (36 pcs of 64 M 】 4 Components) PC100 SDRAM
HB52R1289E22-A6B 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:1 GB Registered SDRAM DIMM 1 GB Registered SDRAM DIMM (36 pcs of 64 M 】 4 Components) PC100 SDRAM
HB52R1289E22-B6B 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:1 GB Registered SDRAM DIMM 1 GB Registered SDRAM DIMM (36 pcs of 64 M 】 4 Components) PC100 SDRAM
HB52R1289E2-A6A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x72 SDRAM Module
HB52R1289E2-B6A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x72 SDRAM Module
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