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IS43DR16320B-25DBLI Datasheet(PDF) 9 Page - Integrated Silicon Solution, Inc |
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IS43DR16320B-25DBLI Datasheet(HTML) 9 Page - Integrated Silicon Solution, Inc |
9 / 30 page IS43/46DR86400B, IS43/46DR16320B Integrated Silicon Solution, Inc. – www.issi.com – 9 Rev. I, 8/01/2012 DDR2 Extended Mode Register 3 (EMR[3]) Setting No function is defined in extended mode register 3. The default value of the extended mode register 3 is not defined. Therefore, the extended mode register 3 must be programmed during initialization for proper operation. DDR2 Extended Mode Register 3 (EMR[3]) Diagram BA1 BA0 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 1 1 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* 0* Address Field Mode Register Note: All bits in EMR[3] except BA0 and BA1 are reserved for future use and must be set to 0 when programming the EMR[3]. Truth Tables Operation or timing that is not specified is illegal, and after such an event, in order to guarantee proper operation, the DRAM must be powered down and then restarted through the specified initialization sequence before normal operation can continue. Command Truth Table Previous Cycle Current Cycle (Extended) Mode Register H H L L L L BA 1, 2 Refresh (REF) H H L L L H X X X X 1 Self Refresh Entry H L L L L H X X X X 1, 8 H X X X L H H H Single Bank Precharge H H L L H L BA X L X 1, 2 Precharge All Banks H H L L H L X X H X 1 Bank Activate H H L L H H BA 1, 2 Write H H L H L L BA X L Column 1, 2, 3, 10 Write with Auto Precharge H H L H L L BA X H Column 1, 2, 3, 10 Read H H L H L H BA X L Column 1, 2, 3, 10 Read with Auto Precharge H H L H L H BA X H Column 1, 2, 3, 10 No Operation (NOP) H X L H H H X X X X 1 Device Deselect H X H X X X X X X X 1 H X X X L H H H H X X X L H H H 1,4 Power Down Exit L H X X X X 1, 4 Row Address Power Down Entry H L X X X X X X X 1, 7, 8 Sel Refresh Exit L H X A10 A9-A0 Notes Opcode CAS# WE# BA0-BA1 An(9)-A11 Function CKE CS# RAS# Notes: 1. All DDR2 SDRAM commands are defined by states of CS#, RAS#, CAS#, WE# and CKE at the rising edge of the clock. 2. Bank addresses BA0, BA1 (BA) determine which bank is to be operated upon. For (E)MRS BA selects an (Extended) Mode Register. 3. Burst reads or writes at BL=4 cannot be terminated or interrupted. See sections "Reads interrupted by a Read" and "Writes interrupted by a Write" for details. 4. The Power Down Mode does not perform any refresh operations. The duration of Power Down is therefore limited by the refresh requirements 5. The state of ODT does not affect the states described in this table. The ODT function is not available during Self Refresh. 6. “X” means “H or L (but a defined logic level)” 7. Self refresh exit is asynchronous. 8. VREF must be maintained during Self Refresh operation. 9. An refers to the MSBs of addresseses. An=A13 for x8, and An=A12 for x16. |
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