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EDI416S4030A Datasheet(PDF) 10 Page - White Electronic Designs Corporation |
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EDI416S4030A Datasheet(HTML) 10 Page - White Electronic Designs Corporation |
10 / 27 page EDI416S4030A 10 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs January, 2003 Rev. 2 White Electronic Designs Corp. reserves the right to change products or specifications without notice. Current State Command Action Notes CE# RAS# CAS# WE# BA A11, A10/AP-A0 Description Write Recovering with Auto Precharge L L L L OP Code Mode Register Set ILLEGAL L L L H X X Auto or Self Refresh ILLEGAL L L H L X X Precharge ILLEGAL 4 L L H H BA Row Address Bank Activate ILLEGAL 4 L H L L BA Column Write ILLEGAL 4,9 L H L H BA Column Read ILLEGAL 4,9 L H H L X X Burst Termination No Operation; Precharge after tDPL L H H H X X No Operation No Operation; Precharge after tDPL H X X X X X Device Deselect No Operation; Precharge after tDPL Refreshing L L L L OP Code Mode Register Set ILLEGAL L L L H X X Auto or Self Refresh ILLEGAL L L H L X X Precharge ILLEGAL L L H H BA Row Address Bank Activate ILLEGAL L H L L BA Column Write ILLEGAL L H L H BA Column Read ILLEGAL L H H L X X Burst Termination No Operation; idle after tRC L H H H X X No Operation No Operation; idle after tRC H X X X X X Device Deselect No Operation; idle after tRC Mode Register Accessing L L L L OP Code Mode Register Set ILLEGAL L L L H X X Auto or Self Refresh ILLEGAL L L H L X X Precharge ILLEGAL L L H H BA Row Address Bank Activate ILLEGAL L H L L BA Column Write ILLEGAL L H L H BA Column Read ILLEGAL L H H L X X Burst Termination ILLEGAL L H H H X X No Operation No Operation; Idle after two clock cycles H X X X X X Device Deselect No Operation; Idle after two clock cycles CURRENT STATE TRUTH TABLE (CONT.) NOTES: 1. CKE is assumed to be active (high) in the previous cycle for all entries. The Current State is the state of the bank that the command is being applied to. 2. All Banks must be idle otherwise it is an illegal action. 3. If CKE is active (high) the SDRAM starts the Auto (CBR) Refresh operation, if CKE is inactive (low) then the Self Refresh mode is entered. 4. The Current State refers only to one of the banks, if BA0, BA1 selects this bank then the action is illegal. If BA0, BA1 selects the bank not being referenced by the Current State then the action may be legal depending on the state of that bank. 5. If CKE is inactive (low) then the Power Down mode is entered, otherwise there is a No Operation. 6. The minimum and maximum Active time (tRAS) must be satisfied. 7. The RAS# to CAS# Delay (tRCD) must occur before the command is given. 8. Address A10 is used to determine if the Auto Precharge function is activated. 9. The command must satisfy any bus contention, bus turn around, and/or write recovery requirements. The command is illegal if the minimum bank to bank delay time (tRRD) is not satisfied. |
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