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HM5259165B Datasheet(PDF) 28 Page - Elpida Memory

Part # HM5259165B
Description  512M LVTTL interface SDRAM 133 MHz/100 MHz 8-Mword 횞 16-bit 횞 4-bank/16-Mword 횞 8-bit 횞 4-bank /32-Mword 횞 4-bit 횞 4-bank PC/133, PC/100 SDRAM
PDF  63 Pages
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

HM5259165B Datasheet(HTML) 28 Page - Elpida Memory

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HM5259165B/HM5259805B/HM5259405B-75/A6
Data Sheet E0118H10
28
Write command to Write command interval:
1. Same bank, same ROW address: When another write command is executed at the same ROW address
of the same bank as the preceding write command, the second write can be performed after an interval of no
less than 1 clock. In the case of burst writes, the second write command has priority.
WRITE to WRITE Command Interval (same ROW address in same bank)
CLK
Command
Din
in B3
Address
in B1
in B2
BS
ACTV
Row
Column A
WRIT
WRIT
Column B
in A0
in B0
Bank0
Active
Column =A
Write
Column =B
Write
Burst Write Mode
Burst Length = 4
Bank 0
2. Same bank, different ROW address: When the ROW address changes, consecutive write commands
cannot be executed; it is necessary to separate the two write commands with a precharge command and a
bank-active command.
3. Different bank: When the bank changes, the second write can be performed after an interval of no less
than 1 clock, provided that the other bank is in the bank-active state. In the case of burst write, the second
write command has priority.
WRITE to WRITE Command Interval (different bank)
CLK
Command
Din
in B3
Address
in B1
in B2
BS
ACTV
Row 0
Row 1
ACTV
WRIT
Column A
in A0
in B0
Bank0
Active
Bank3
Active
Bank0
Write
Bank3
Write
WRIT
Column B
Burst Write Mode
Burst Length = 4



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