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AS29LV400 Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation |
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AS29LV400 Datasheet(HTML) 3 Page - Alliance Semiconductor Corporation |
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3 / 25 page  ® AS29LV400 March 2001 3/20/01; V.0.9.3 Alliance Semiconductor P. 3 of 25 Operating modes L = Low (<VIL) = logic 0; H = High (>VIH) = logic 1; VID = 10.0 ± 1.0V; X = don’t care. In ×16 mode, BYTE = VIH. In ×8 mode, BYTE = VIL with DQ8-DQ14 in high Z and DQ15 = A-1. †Verification of sector protect/unprotect during A9 = V ID. Mode definitions Mode CE OE WE A0 A1 A6 A9 RESE T DQ ID read MFR code LLH L LLVID HCode ID read device code L L H H L L VID HCode Read L L H A0 A1 A6 A9 H DOUT Standby H XXX XXXH High Z Output disable L H H X XXXH High Z Write L H L A0 A1 A6 A9 H DIN Enable sector protect L VID Pulse/L L H L VID HX Sector unprotect L VID Pulse/L L HHVID HX Temporary sector unprotect XXXX XXXVID X Verify sector protect† LLH L H LVID HCode Verify sector unprotect † LLH L H H VID HCode Hardware Reset XXXX XXXL High Z Item Description ID MFR code, device code Selected by A9 = VID(9.5V–10.5V), CE = OE = A1 = A6 = L, enabling outputs. When A0 is low (VIL) the output data = 52h, a unique Mfr. code for Alliance Semiconductor Flash products. When A0 is high (VIH), DOUT represents the device code for the AS29LV400. Read mode Selected with C E = O E = L, W E = H. Data is valid in tACC time after addresses are stable, tCE after CE is low and tOE after OE is low. Standby Selected with C E = H. Part is powered down, and ICC reduced to <1.0 µA when CE = VCC ± 0.3V = R ESET. If activated during an automated on-chip algorithm, the device completes the operation before entering standby. Output disable Part remains powered up; but outputs disabled with O E pulled high. Write Selected with C E = WE = L, OE = H. Accomplish all Flash erasure and programming through the command register. Contents of command register serve as inputs to the internal state machine. Address latching occurs on the falling edge of W E or C E , whichever occurs later. Data latching occurs on the rising edge W E or C E , whichever occurs first. Filters on W E prevent spurious noise events from appearing as write commands. Enable sector protect Hardware protection circuitry implemented with external programming equipment causes the device to disable program and erase operations for specified sectors. For in-system sector protection, refer to Sector protect algorithm on page 14. Sector unprotect Disables sector protection for all sectors using external programming equipment. All sectors must be protected prior to sector unprotection. For in-system sector unprotection, refer to Sector unprotect algorithm on page 14. Verify sector protect/ unprotect Verifies write protection for sector. Sectors are protected from program/erase operations on commercial programming equipment. Determine if sector protection exists in a system by writing the ID read command sequence and reading location XXX02h, where address bits A12–17 select the defined sector addresses. A logical 1 on DQ0 indicates a protected sector; a logical 0 indicates an unprotected sector. |
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