hm5264165f-75 Elpida Memory, Inc., hm5264165f-75 Datasheet - Page 29

• Manufacturer Part Number: hm5264165f-75
• Description: 64m Lvttl Interface Sdram
• Manufacturer: Elpida Memory, Inc.

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)
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)
Command
Command
Address
Address
CLK
CLK
Din
Din
BS
BS
ACTV
Bank0
Bank0
Active
ACTV
Active
Row 0
Row
Column =A
Write
HM5264165F/HM5264805F/HM5264405F-75/A60/B60
Column A
ACTV WRIT
Bank3
Active
WRIT
in A0
Row 1
Column =B
Data Sheet E0135H10
Column B
Column A
WRIT
Bank0
in A0
in B0
Write
Write
Column B
WRIT
in B0
in B1
Bank3
Write
in B2
in B1
in B3
in B2
in B3
Burst Write Mode
Burst Length = 4
Burst Write Mode
Burst Length = 4
Bank 0
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