參數(shù)資料
型號: HM5225805B
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): 20/64頁
文件大小: 802K
代理商: HM5225805B
HM5225165B/HM5225805B/HM5225405B-75/A6/B6
20
Mode Register Configuration
The mode register is set by the input to the address pins (A0 to A12, BA0 and BA1) during mode register set
cycles. The mode register consists of five sections, each of which is assigned to address pins.
BA1, BA0, A11, A10, A12, A9, A8: (OPCODE):
The SDRAM has two types of write modes. One is the
burst write mode, and the other is the single write mode. These bits specify write mode.
Burst read and burst write:
Burst write is performed for the specified burst length starting from the column
address specified in the write cycle.
Burst read and single write:
Data is only written to the column address specified during the write cycle,
regardless of the burst length.
A7:
Keep this bit Low at the mode register set cycle. If this pin is high, the vender test mode is set.
A6, A5, A4: (LMODE):
These pins specify the
CAS
latency.
A3: (BT):
A burst type is specified.
A2, A1, A0: (BL):
These pins specify the burst length.
A2 A1
A0
Burst length
BT=0
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
1
2
4
8
R
R
1
1
1
BT=1
1
1
0
R
R
1
2
4
8
R
R
R
R
A3
0 Sequential
1
Interleave
Burst type
A6
0
0
0
0
1
A5
0
0
1
1
X
A4 CAS latency
0
1
0
1
X
R
R
2
3
R
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
OPCODE
0
LMODE
BT
BL
A9
0
0
1
1
R
Write mode
Burst read and burst write
A8
0
1
0
1
Burst read and single write
R
R is Reserved (inhibit)
X: 0 or 1
A11
A10
A10
X
X
X
A11
0
X
X
X
0
A12
BA0
BA1
BA1 BA0
0
X
X
X
0
X
X
X
A12
0
X
X
X
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參數(shù)描述
HM5225805B-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
HM5225805B-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
HM5225805B-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
HM5225805BLTT-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
HM5225805BLTT-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