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A29L040A-70F Datasheet(PDF) 7 Page - AMIC Technology |
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A29L040A-70F Datasheet(HTML) 7 Page - AMIC Technology |
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7 / 30 page  A29L040A Series PRELIMINARY (March, 2005, Version 0.0) 6 AMIC Technology, Corp. Autoselect Mode The autoselect mode provides manufacturer and device identification, and sector protection verification, through identifier codes output on I/O7 - I/O0. This mode is primarily intended for programming equipment to automatically match a device to be programmed with its corresponding programming algorithm. However, the autoselect codes can also be accessed in-system through the command register. When using programming equipment, the autoselect mode requires VID (11.5V to 12.5 V) on address pinA9. Address pins A6, A1, and AO must be as shown in Autoselect Codes (High Voltage Method) table. In addition, when verifying sector protection, the sector address must appear on the appropriate highest order address bits. Refer to the corresponding Sector Address Tables. The Command Definitions table shows the remaining address bits that are don't care. When all necessary bits have been set as required, the programming equipment may then read the corresponding identifier code on I/O7 - I/O0.To access the autoselect codes in-system, the host system can issue the autoselect command via the command register, as shown in the Command Definitions table. This method does not require VID. See "Command Definitions" for details on using the autoselect mode. Table 3. A29L040A Autoselect Codes (High Voltage Method) Description A18 - A16 A15 - A10 A9 A8 - A7 A6 A5 - A2 A1 AO Identifier Code on I/O7 - I/O0 Manufacturer ID: AMIC X X VID X VIL X VIL VIL 37h Device ID: A29L040A X X VID X VIL X VIL VIH 92h 01h (protected) Sector Protection Verification Sector Address X VID X VIL X VIH VIL 00h (unprotected) Continuation ID X X VID X VIL X VIH VIH 7Fh Sector Protection/Unprotection The hardware sector protection feature disables both program and erase operations in any sector. The hardware sector unprotection feature re-enables both program and erase operations in previously protected sectors. Sector protection/unprotection must be implemented using programming equipment. The procedure requires a high voltage (VID) on address pin A9 and the control pins. The device is shipped with all sectors unprotected. It is possible to determine whether a sector is protected or unprotected. See "Autoselect Mode" for details. Hardware Data Protection The requirement of command unlocking sequence for programming or erasing provides data protection against inadvertent writes (refer to the Command Definitions table). In addition, the following hardware data protection measures prevent accidental erasure or programming, which might otherwise be caused by spurious system level signals during VCC power-up transitions, or from system noise. The device is powered up to read array data to avoid accidentally writing data to the array. Write Pulse "Glitch" Protection Noise pulses of less than 5ns (typical) on OE , CE or WE do not initiate a write cycle. Logical Inhibit Write cycles are inhibited by holding any one of OE =VIL, CE = VIH or WE = VIH. To initiate a write cycle, CE and WE must be a logical zero while OE is a logical one. Power-Up Write Inhibit If WE = CE = VIL and OE = VIH during power up, the device does not accept commands on the rising edge of WE . The internal state machine is automatically reset to reading array data on the initial power-up. |
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