參數(shù)資料
型號： HM5225405B
廠商： Hitachi,Ltd.
英文描述： 256M LVTTL interface SDRAM(256M LVTTL接口同步DRAM)
中文描述： 256M LVTTL接口的SDRAM（256M LVTTL接口同步的DRAM）
文件頁數(shù)： 22/64頁
文件大?。?/td> 802K
代理商： HM5225405B
HM5225165B/HM5225805B/HM5225405B-75/A6/B6
22
Operation of the SDRAM
The following chapter shows operation example of the products below.
Organization
Input/output mask
CAS
latency
4-Mword
×
16-bit
×
4 bank
8-Mword
×
8-bit
×
4 bank
16-Mword
×
4-bit
×
4 bank
DQMU/DQML
2/3
DQM
DQM
Note:
and “AC Characteristics”).
The SDRAM should be used according to the product capability (See “Features”, “Pin Description”
Read/Write Operations
Bank active:
Before executing a read or write operation, the corresponding bank and the row address must be
activated by the bank active (ACTV) command. An interval of t
RCD
is required between the bank active
command input and the following read/write command input.
Read operation:
A read operation starts when a read command is input. Output buffer becomes Low-Z in
the (
CAS
Latency - 1) cycle after read command set. The SDRAM can perform a burst read operation.
The burst length can be set to 1, 2, 4, 8. The start address for a burst read is specified by the column address
and the bank select address (BA0/BA1) at the read command set cycle. In a read operation, data output starts
after the number of clocks specified by the
CAS
Latency. The
CAS
Latency can be set to 2 or 3.
When the burst length is 1, 2, 4, 8, the Dout buffer automatically becomes High-Z at the next clock after the
successive burst-length data has been output.
The
CAS
latency and burst length must be specified at the mode register.
相關(guān)PDF資料
PDF描述
HM5225805B 256M LVTTL interface SDRAM(256M LVTTL接口同步DRAM)
HM5225165B 256M LVTTL interface SDRAM(256M LVTTL接口同步DRAM)
HM5251405B 512-Mbit SDRAM(512M位同步RAM)
HM5251805B 512-Mbit SDRAM(512M位同步RAM)
HM5251165B 512-Mbit SDRAM(512M位同步RAM)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HM5225405B-75 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M LVTTL interface SDRAM 133 MHz/100 MHz 4-Mword 】 16-bit 】 4-bank/8-Mword 】 8-bit 】 4-bank /16-Mword 】 4-bit 】 4-bank PC/133, PC/100 SDRAM
HM5225405B-A6 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M LVTTL interface SDRAM 133 MHz/100 MHz 4-Mword 】 16-bit 】 4-bank/8-Mword 】 8-bit 】 4-bank /16-Mword 】 4-bit 】 4-bank PC/133, PC/100 SDRAM
HM5225405B-B6 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M LVTTL interface SDRAM 133 MHz/100 MHz 4-Mword 】 16-bit 】 4-bank/8-Mword 】 8-bit 】 4-bank /16-Mword 】 4-bit 】 4-bank PC/133, PC/100 SDRAM
HM5225405BLTT-75 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M LVTTL interface SDRAM 133 MHz/100 MHz 4-Mword 】 16-bit 】 4-bank/8-Mword 】 8-bit 】 4-bank /16-Mword 】 4-bit 】 4-bank PC/133, PC/100 SDRAM
HM5225405BLTT-A6 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M LVTTL interface SDRAM 133 MHz/100 MHz 4-Mword 】 16-bit 】 4-bank/8-Mword 】 8-bit 】 4-bank /16-Mword 】 4-bit 】 4-bank PC/133, PC/100 SDRAM
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