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AS58C1001SF-20XT Datasheet(PDF) 4 Page - Austin Semiconductor |
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AS58C1001SF-20XT Datasheet(HTML) 4 Page - Austin Semiconductor |
4 / 19 page EEPROM AS58C1001 Austin Semiconductor, Inc. AS58C1001 Rev. 4.0 3/01 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 4 (EXAMPLE) Vcc RES\ *unprogrammable *unprogrammable FUNCTIONAL DESCRIPTION (continued) DATA PROTECTION (continued) 2. Data protection at Vcc on/off. When RES\ is low, the EEPROM cannot be erased and programmed. Therefore, data can be protected by keeping RES\ low when Vcc is switched. RES\ should be high during programming because it does not provide a latch function. When Vcc is turned on or off, noise on the control pins generated by external circuits (CPU, etc.) may turn the EEPROM to programming mode by mistake. To prevent this unintentional programming, the EEPROM must be kept in an unprogrammable, standby or readout state by using a CPU reset signal to RES\ pin. In addition, when RES\ is kept high at Vcc on/off timing, the input level of control pins (CE\, OE\, WE\) must be held as CE\=Vcc or OE\=LOW or WE\=Vcc level. 3. Software Data Protection To protect against unintentional programming caused by noise generated by external circuits, AS58C1001 has a Software data protection function. To initate Software data protection mode, 3 bytes of data must be input, followed by a dummy write cycle of any address and any data byte. This exact sequence switches the device into protection mode. This 4th cycle during write is required to initiate the SDP and physically writes the address and data. While in SDP the entire array is protected in which writes can only occur if the exact SDP sequence is re-executed or the unprotect sequence is executed. The Software data protection mode can be cancelled by inputting the following 6 Bytes. This changes the AS58C1001 to the Non-Protection mode, for normal operation. Address Data 5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 20 Write Data Write Address (Normal Data Input) 5555 AA 2AAA 55 5555 A0 |
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