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AS29F040-55TC Datasheet(PDF) 3 Page - Alliance Semiconductor Corporation |
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AS29F040-55TC Datasheet(HTML) 3 Page - Alliance Semiconductor Corporation |
3 / 18 page ® $65<)373 $65<)373 $65<)373 $65<)373 ','#440533440$1#728233 ','#440533440$1#728233 ','#440533440$1#728233 ','#440533440$1#728233 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 $//,$1&(#6(0,&21'8&725 6666 0DUFK#5333 0DUFK#5333 0DUFK#5333 0DUFK#5333 2SHUDWLQJ#PRGHV L = Low (<VIL); H = High (>VIH); VID = 12.0 ± 0.5V; X = don’t car . 0RGH#GHILQLWLRQV Mode CE OE WE A0 A1 A6 A9 DQ0-DQ7 ID read MFR code L L H L L L VID Code ID read device code L L H H L L VID Code Read L L H A0A1A6A9DOUT Standby H XXX XXX High Z Output disable L H H X X X X High Z Write L H L A0 A1 A6 A9 DIN Enable sector protect L VID Pulse/L L H L VID X Sector unprotect L VID Pulse/L L HHVID X Verify sector protect L L H L H L VID Code Item Description ID MFR code, device code Selected by A9 = VID(11.5–12.5V), 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 AS29F040. Read mode Selected with CE = OE = L, WE = 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 CE = H. Part is powered down, and ICC reduced to <1.0 mA for TTL input levels and <100 µA for CMOS levels. 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 OE pulled high. Write Selected with CE = 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 WE or CE, whichever occurs late . Data latching occurs on the rising edge WE or CE, whichever occurs first. Filters on WE 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. Sector unprotect Disables sector protection for all sectors using external programming equipment. All sectors must be protected prior to sector unprotection. Verify sector protect 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 A16–18 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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