HM5259165B datasheet(27/63 Pages) ELPIDA

27 / 63 page

HM5259165B/HM5259805B/HM5259405B-75/A6

Data Sheet E0118H10

Command Intervals

Read command to Read command interval:

1. Same bank, same ROW address: When another read command is executed at the same ROW address

of the same bank as the preceding read command execution, the second read can be performed after an

interval of no less than 1 clock. Even when the first command is a burst read that is not yet finished, the data

read by the second command will be valid.

READ to READ Command Interval (same ROW address in same bank)

CLK

Command

Dout

out B3

Address

out B1 out B2

ACTV

Row

Column A

READ

Column B

out A0 out B0

Bank0

Active

Column =A

Read

Column =B

Read

Column =A

Dout

Column =B

Dout

CAS Latency = 3

Burst Length = 4

Bank 0

2. Same bank, different ROW address: When the ROW address changes on same bank, consecutive read

commands cannot be executed; it is necessary to separate the two read commands with a precharge command

and a bank-active command.

3. Different bank: When the bank changes, the second read can be performed after an interval of no less

than 1 clock, provided that the other bank is in the bank-active state. Even when the first command is a burst

read that is not yet finished, the data read by the second command will be valid.

READ to READ Command Interval (different bank)

CLK

Command

Dout

out B3

Address

out B1 out B2

ACTV

Row 0

Row 1

ACTV

READ

Column A

out A0 out B0

Bank0

Active

Bank3

Active

Bank0

Read

Bank3

Read

READ

Column B

Bank0

Dout

Bank3

Dout

CAS Latency = 3

Burst Length = 4

HM5259165B Datasheet(PDF) 27 Page - Elpida Memory

HM5259165B Datasheet(HTML) 27 Page - Elpida Memory

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