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HM5212165FTD-75 Datasheet(PDF) 8 Page - Hitachi Semiconductor |
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HM5212165FTD-75 Datasheet(HTML) 8 Page - Hitachi Semiconductor |
8 / 63 page HM5212165F/HM5212805F-75/A60/B60 8 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 A12/A13 A10 A0 to A11 Ignore command DESL H × H ××× × × × No operation NOP H × L HHH ×× × Burst stop in full page BST H × L HHL ×× × 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 × L LLL 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. Burst stop in full-page [BST]: This command stops a full-page burst operation (burst length = full-page (512; HM5212165F, 1024; HM5212805F)), and is illegal otherwise. When data input/output is vompleted for a full page of data, it automatically returns to the start address and input/output is preformed repeatedly. 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 AY8; HM5212165F, AY0 to AY9; HM5212805F) 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. When the burst length is full-page, this command is illegal. |
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