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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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HM5259165B Datenblatt(PDF) 27 Page - Elpida Memory |
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HM5259165B Datenblatt(HTML) 27 Page - Elpida Memory |
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27 / 63 page  HM5259165B/HM5259805B/HM5259405B-75/A6 Data Sheet E0118H10 27 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 BS ACTV Row Column A READ 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 BS 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 |
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