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HM5257165B-A6 Datasheet(PDF) 10 Page - Elpida Memory |
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HM5257165B-A6 Datasheet(HTML) 10 Page - Elpida Memory |
10 / 62 page HM5257165B/HM5257805B/HM5257405B-75/A6 Data Sheet E0081H10 10 V SS and VSSQ (power supply pins): Ground is connected. (VSS is for the internal circuit and VSSQ is for the output buffer.) Command Operation Command Truth Table The SDRAM recognizes the following commands specified by the CS, RAS, CAS, WE and address pins. CKE Command Symbol n - 1 n CS RAS CAS WE BA0/BA1 A10 A0 to A12 Ignore command DESL H × H ×× × × × × No operation NOP H × LH H H ×× × Column address and read command READ H × LH L H V L V Read with auto-precharge READ A H × LH L H V H V Column address and write command WRIT H × LH L L V L V Write with auto-precharge WRIT A H × LH L L V H V Row address strobe and bank active ACTV H × LL H H V V V Precharge select bank PRE H × LL H L V L × Precharge all bank PALL H × LL H L × H × Refresh REF/SELF H V L L L H ×× × Mode register set MRS H × LL L L V V V Note: H: V IH. L: V IL. ×: VIH or VIL. V: Valid address input Ignore command [DESL]: When this command is set ( CS is High), the SDRAM ignore command input at the clock. However, the internal status is held. No operation [NOP]: This command is not an execution command. However, the internal operations continue. Column address strobe and read command [READ]: This command starts a read operation. In addition, the start address of burst read is determined by the column address (AY0 to AY9; HM5257165B, AY0 to AY9, AY11; HM5257805B, AY0 to AY9, AY11, AY12; HM5257405B) and the bank select address (BS). After the read operation, the output buffer becomes High-Z. Read with auto-precharge [READ A]: This command automatically performs a precharge operation after a burst read with a burst length of 1, 2, 4 or 8. |
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