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AM29F400AT-150ECB Datasheet(PDF) 9 Page - Advanced Micro Devices |
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AM29F400AT-150ECB Datasheet(HTML) 9 Page - Advanced Micro Devices |
9 / 35 page Am29F400AT/Am29F400AB 9 PRELIMINARY Output Disable With the OE input at a logic high level (VIH), output from the device is disabled. This will cause the output pins to be in a high impedance state. Autoselect The autoselect mode allows the reading of a binary code from the device and will identify its manufacturer and type. This mode is intended for use by program- ming equipment for the purpose of automatically matching the device to be programmed with its corre- sponding programming algorithm. This mode is func- tional over the entire temperature range of the device. To activate this mode, the programming equipment must force VID (11.5 V to 12.5 V) on address pin A9. Two identifier bytes may then be sequenced from the device outputs by toggling address A0 from VIL to VIH. All addresses are don’t cares except A0, A1, and A6 (see Table 3). The manufacturer and device codes may also be read via the command register, for instances when the Am29F400A is erased or programmed in a system without access to high voltage on the A9 pin. The com- mand sequence is illustrated in Table 4 (see Autoselect Command Sequence). Byte 0 (A0 = VIL) represents the manufacturer’s code (AMD=01H) and byte 1 (A0 = VIH) the device identifier code (Am29F400AT = 23H and Am29F400AB = ABH for x8 mode; Am29F400AT = 2223H and Am29F400AB = 22ABH for x16 mode). These two bytes/words are given in the table below. All identifiers for manufacturer and device will exhibit odd parity with DQ7 defined as the parity bit. In order to read the proper device codes when executing the Autoselect, A1 must be VIL (see Tables 3 and 4). The autoselect mode also facilitates the determination of sector protection in the system. By performing a read operation at the address location XX02H with the higher order address bits A12–A17 set to the desired sector address, the device will return 01H for a pro- tected sector and 00H for a non-protected sector. Table 3. Am29F400A Sector Protection Verify Autoselect Codes *Outputs 01H at protected sector addresses Table 4. Expanded Autoselect Code Table B) - Byte mode (W) - Word mode Type A12-A17 A6 A1 A0 Code (HEX) Manufacturer Code-AMD X VIL VIL VIL 01H Am29F400A Device Am29F400AT Byte XVIL VIL VIH 23H Word 2223H Am29F400AB Byte XVIL VIL VIH ABH Word 22ABH Sector Protection Sector Address VIL VIH VIL 01H* Type Code DQ 15 DQ 14 DQ 13 DQ 12 DQ 11 DQ 10 DQ 9 DQ 8 DQ 7 DQ 6 DQ 5 DQ 4 DQ 3 DQ 2 DQ 1 DQ 0 Manufacturer Code-AMD 01H 000000 0 0 00000001 Am29F400A Device Am29F400AT(B) (W) 23H 2223H A-1 0 HI-Z 0 HI-Z 1 HI-Z 0 HI-Z 0 HI-Z 0 HI-Z 1 HI-Z 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 1 1 Am29F400AB(B) (W) ABH 22ABH A-1 0 HI-Z 0 HI-Z 1 HI-Z 0 HI-Z 0 HI-Z 0 HI-Z 1 HI-Z 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 1 Sector Protection 01H 000000 0 0 00000001 |
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