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S29AL008J70BFI020 Datasheet(PDF) 18 Page - SPANSION |
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S29AL008J70BFI020 Datasheet(HTML) 18 Page - SPANSION |
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18 / 54 page  18 S29AL008J S29AL008J_00_11 April 12, 2012 Da ta Sh e e t 7.9 Autoselect Mode The autoselect mode provides manufacturer and device identification, and sector group protection verification, through identifier codes output on DQ7–DQ0. 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 (8.5 V to 12.5 V) on address pin A9. Address pins A6 and A3–A0 must be as shown in Table 7.6. In addition, when verifying sector group protection, the sector address must appear on the appropriate highest order address bits (see Table 7.2 on page 16 and Table 7.4 on page 17). Table 7.6 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 DQ7-DQ0. To access the autoselect codes in-system, the host system can issue the autoselect command via the command register, as shown in Table 10.1 on page 32. This method does not require VID. See Command Definitions on page 27 for details on using the autoselect mode. Legend 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. See Table 10.1 on page 32. 7.10 Sector Group Protection/Unprotection The hardware sector group protection feature disables both program and erase operations in any sector group (see Table 7.2 on page 16 to Table 7.5 on page 17). The hardware sector group unprotection feature re-enables both program and erase operations in previously protected sector groups. Sector group protection/unprotection can be implemented via two methods. Sector protection/unprotection requires VID on the RESET# pin only, and can be implemented either in- system or via programming equipment. Figure 7.2 on page 21 shows the algorithms and Figure 17.11 on page 47 shows the timing diagram. This method uses standard microprocessor bus cycle timing. For sector group unprotect, all unprotected sector groups must first be protected prior to the first sector group unprotect write cycle. The device is shipped with all sector groups unprotected. Spansion offers the option of programming and protecting sector groups at its factory prior to shipping the device through Spansion Programming Service. Contact a Spansion representative for details. It is possible to determine whether a sector group is protected or unprotected. See Autoselect Mode on page 18 for details. Table 7.6 S29AL008J Autoselect Codes (High Voltage Method) Description Mode CE# OE# WE# A18 to A10 A9 A8 to A7 A6 A5 to A4 A3 to A2 A1 A0 DQ8 to DQ15 DQ7 to DQ0 Manufacturer ID: Spansion L L H X VID XLXL L L X 01h Device ID: S29AL008J (Top Boot Block) Word L L H XVID XLXL L H 22h DAh Byte L L H X DAh Device ID: S29AL008J (Bottom Boot Block) Word L L H XVID XLXL L H 22h 5Bh Byte L L H X 5Bh Sector Group Protection Verification L L H SA VID XLXL H L X 01h (protected) X 00h (unprotected) Secured Silicon Sector Indicator Bit (DQ7) Top Boot Block LL H X VID XLXL H H X 8Eh (factory locked) 0Eh (not factory locked) Secured Silicon Sector Indicator Bit (DQ7) Bottom Boot Block LL H X VID XLXL H H X 96h (factory locked) 16h (not factory locked) |
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