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EM636165-XXI 参数 Datasheet PDF下载

EM636165-XXI图片预览
型号: EM636165-XXI
PDF下载: 下载PDF文件 查看货源
内容描述: 1Mega ×16同步DRAM (SDRAM)的 [1Mega x 16 Synchronous DRAM (SDRAM)]
分类和应用: 动态存储器
文件页数/大小: 73 页 / 756 K
品牌: ETRON [ ETRON TECHNOLOGY, INC. ]
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EtronTech  
EM636165-XXI  
1M x 16 SDRAM  
Commands  
1
BankPrecharge command  
(RAS# = "L", CAS# = "H", WE# = "L", A11 = V, A10 = "L", A0-A9 = Don't care)  
The BankPrecharge command precharges the bank disignated by A11 signal. The precharged  
bank is switched from the active state to the idle state. This command can be asserted anytime after  
tRAS(min.) is satisfied from the BankActivate command in the desired bank. The maximum time any  
bank can be active is specified by tRAS(max.). Therefore, the precharge function must be performed  
in any active bank within tRAS(max.). At the end of precharge, the precharged bank is still in the idle  
state and is ready to be activated again.  
2
3
PrechargeAll command  
(RAS# = "L", CAS# = "H", WE# = "L", A11 = Don't care, A10 = "H", A0-A9 = Don't care)  
The PrechargeAll command precharges both banks simultaneously and can be issued even if  
both banks are not in the active state. Both banks are then switched to the idle state.  
Read command  
(RAS# = "H", CAS# = "L", WE# = "H", A11= V, A9 = "L", A0-A7 = Column Address)  
The Read command is used to read a burst of data on consecutive clock cycles from an active  
row in an active bank. The bank must be active for at least tRCD(min.) before the Read command is  
issued. During read bursts, the valid data-out element from the starting column address will be  
available following the CAS# latency after the issue of the Read command. Each subsequent data-  
out element will be valid by the next positive clock edge (refer to the following figure). The DQs go  
into high-impedance at the end of the burst unless other command is initiated. The burst length,  
burst sequence, and CAS# latency are determined by the mode register, which is already  
programmed. A full-page burst will continue until terminated (at the end of the page it will wrap to  
column 0 and continue).  
T0  
T1  
T2  
T3  
T4  
T5  
T6  
T7  
T8  
CLK  
COMMAND  
READ A  
NOP  
NOP  
NOP  
NOP  
NOP  
NOP  
NOP  
NOP  
CAS# latency=1  
DOUT A  
DOUT A  
DOUT A  
DOUT A  
3
0
1
2
t
, DQ's  
CK1  
CAS# latency=2  
, DQ's  
DOUT A  
DOUT A  
DOUT A  
DOUT A  
3
0
1
2
t
CK2  
CAS# latency=3  
, DQ's  
DOUT A  
DOUT A  
1
DOUT A  
DOUT A  
3
0
2
t
CK3  
Burst Read Operation  
(Burst Length = 4, CAS# Latency = 1, 2, 3)  
Preliminary  
6
Rev. 1.1 Apr. 2005  
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