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IS42S16400B-7TL Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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IS42S16400B-7TL Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 55 page  IS42S16400B ISSI® Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774 5 Rev. D 02/10/05 enabled or disabled. AUTO PRECHARGE does not apply except in full-page burst mode. Upon completion of the READ or WRITE burst, a precharge of the bank/row that is addressed is automatically performed. AUTO REFRESH COMMAND This command executes the AUTO REFRESH operation. The row address and bank to be refreshed are automatically generated during this operation. The stipulated period (tRC) is required for a single refresh operation, and no other commands can be executed during this period. This com- mand is executed at least 4096 times every 64ms. During an AUTO REFRESH command, address bits are “Don’t Care”. This command corresponds to CBR Auto-refresh. SELF REFRESH During the SELF REFRESH operation, the row address to be refreshed, the bank, and the refresh interval are generated automatically internally. SELF REFRESH can be used to retain data in the SDRAM without external clocking, even if the rest of the system is powered down. The SELF REFRESH operation is started by dropping the CKE pin from HIGH to LOW. During the SELF REFRESH operation all other inputs to the SDRAM become “Don’t Care”. The device must remain in self refresh mode for a minimum period equal to tRAS or may remain in self refresh mode for an indefinite period beyond that. The SELF- REFRESH operation continues as long as the CKE pin remains LOW and there is no need for external control of any other pins. The next command cannot be executed until the device internal recovery period (tRC) has elapsed. Once CKE goes HIGH, the NOP command must be issued (minimum of two clocks) to provide time for the completion of any internal refresh in progress. After the self-refresh, since it is impossible to determine the address of the last row to be refreshed, an AUTO-REFRESH should immediately be performed for all addresses. BURST TERMINATE The BURST TERMINATE command forcibly terminates the burst read and write operations by truncating either fixed- length or full-page bursts and the most recently registered READ or WRITE command prior to the BURST TERMI- NATE. COMMAND INHIBIT COMMAND INHIBIT prevents new commands from being executed. Operations in progress are not affected, apart from whether the CLK signal is enabled NO OPERATION When CS is low, the NOP command prevents unwanted commands from being registered during idle or wait states. LOAD MODE REGISTER During the LOAD MODE REGISTER command the mode register is loaded from A0-A11. This command can only be issued when all banks are idle. ACTIVE COMMAND When the ACTIVE COMMAND is activated, BA0, BA1 inputs selects a bank to be accessed, and the address inputs on A0-A11 selects the row. Until a PRECHARGE command is issued to the bank, the row remains open for accesses. |
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