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A29L400AUV-70U Datasheet(PDF) 9 Page - AMIC Technology |
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A29L400AUV-70U Datasheet(HTML) 9 Page - AMIC Technology |
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9 / 38 page  A29L400A Series PRELIMINARY (July, 2005, Version 0.0) 8 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 pin A9. Address pins A6, A1, and A0 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 4. A29L400A Autoselect Codes (High Voltage Method) Description Mode CE OE WE A17 to A12 A11 to A10 A9 A8 to A7 A6 A5 to A2 A1 A0 I/O8 to I/O15 I/O7 to I/O0 Manufacturer ID: AMIC L L H X X VID X L X L L X 37h Word B3h 34h Device ID: A29L400A (Top Boot Block) Byte L L H X X VID XLX L H X 34h Word B3h B5h Device ID: A29L400A (Bottom Boot Block) Byte L L H X X VID XLX L H X B5h Continuation ID L L H X X VID XLXH H X 7Fh X 01h (protected) Sector Protection Verification L L H SA X VID XLXH L X 00h (unprotected) L=Logic Low= VIL, H=Logic High=VIH, SA=Sector Address, X=Don’t Care. Note: The autoselect codes may also be accessed in-system via command sequences. |
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