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IS61LF25618A Datasheet(PDF) 10 Page - Integrated Silicon Solution, Inc |
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IS61LF25618A Datasheet(HTML) 10 Page - Integrated Silicon Solution, Inc |
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10 / 25 page  10 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. 00A 08/11/05 ISSI® IS61(64)LF12832A, IS61(64)LF12836A, IS61(64)LF25618A IS64VF12832A, IS61(64)VF12836A, IS61(64)VF25618A PARTIAL TRUTH TABLE Function GW GW GW GW GW BWE BWE BWE BWE BWE BWa BWa BWa BWa BWa BWb BWb BWb BWb BWb BWc BWc BWc BWc BWc BWd BWd BWd BWd BWd Read H H X X X X Read H L H H H H Write Byte 1 H L L H H H Write All Bytes H L L L L L Write All Bytes L X X X X X TRUTH TABLE(1-8) OPERATION ADDRESS CE CE CE CE CE CE2 CE2 CE2 CE2 CE2 CE2 ZZ ADSP ADSP ADSP ADSP ADSP ADSC ADSC ADSC ADSC ADSC ADV ADV ADV ADV ADV WRITE WRITE WRITE WRITE WRITE OE OE OE OE OE CLK DQ Deselect Cycle, Power-Down None H X X L X L X X X L-H High-Z Deselect Cycle, Power-Down None L X L L L XXXX L-H High-Z Deselect Cycle, Power-Down None L H X L L XXXX L-H High-Z Deselect Cycle, Power-Down None L X L L H L X X X L-H High-Z Deselect Cycle, Power-Down None L H X L H L X X X L-H High-Z Snooze Mode, Power-Down None X X X H X XXXX X High-Z Read Cycle, Begin Burst External L L H L L X X X L L-H Q Read Cycle, Begin Burst External L L H L L X X X H L-H High-Z Write Cycle, Begin Burst External L L H L H L X L X L-H D Read Cycle, Begin Burst External L L H L H L X H L L-H Q Read Cycle, Begin Burst External L L H L H L X H H L-H High-Z Read Cycle, Continue Burst Next X X X L H H L H L L-H Q Read Cycle, Continue Burst Next X X X L H H L H H L-H High-Z Read Cycle, Continue Burst Next H X X L X H L H L L-H Q Read Cycle, Continue Burst Next H X X L X H L H H L-H High-Z Write Cycle, Continue Burst Next X X X L H H L L X L-H D Write Cycle, Continue Burst Next H X X L X H L L X L-H D Read Cycle, Suspend Burst Current X X X L H H H H L L-H Q Read Cycle, Suspend Burst Current X X X L H HHHH L-H High-Z Read Cycle, Suspend Burst Current H X X L X H H H L L-H Q Read Cycle, Suspend Burst Current H X X L X HHHH L-H High-Z Write Cycle, Suspend Burst Current X X X L H H H L X L-H D Write Cycle, Suspend Burst Current H X X L X H H L X L-H D NOTE: 1. X means “Don’t Care.” H means logic HIGH. L means logic LOW. 2. For WRITE, L means one or more byte write enable signals (BWa-d) and BWE are LOW or GW is LOW. WRITE = H for all BWx, BWE, GW HIGH. 3. BWa enables WRITEs to DQa’s and DQPa. BWb enables WRITEs to DQb’s and DQPb. BWc enables WRITEs to DQc’s and DQPc. BWd enables WRITEs to DQd’s and DQPd. DQPa and DQPb are available on the x18 version. DQPa-DQPd are available on the x36 version. 4. All inputs except OE and ZZ must meet setup and hold times around the rising edge (LOW to HIGH) of CLK. 5. Wait states are inserted by suspending burst. 6. For a WRITE operation following a READ operation, OE must be HIGH before the input data setup time and held HIGH during the input data hold time. 7. This device contains circuitry that will ensure the outputs will be in High-Z during power-up. 8. ADSP LOW always initiates an internal READ at the L-H edge of CLK. A WRITE is performed by setting one or more byte write enable signals and BWE LOW or GW LOW for the subsequent L-H edge of CLK. See WRITE timing diagram for clarification. |
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