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AM29F016-75SC 数据表(PDF) 9 Page - Advanced Micro Devices |
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AM29F016-75SC 数据表(HTML) 9 Page - Advanced Micro Devices |
9 / 36 page Am29F016 9 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 2). The manufacturer and device codes may also be read via the command register, for instances when the Am29F016 is erased or programmed in a system with- out access to high voltage on the A9 pin. The command sequence is illustrated in Table 5 (see Autoselect Com- mand Sequence). Byte 0 (A0 = VIL) represents the manufacturer’s code (AMD = 01H) and byte 1 (A0 = VIH) the device identifier code for Am29F016 = ADH. These two bytes 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 Table 2). The autoselect mode also facilitates the determination of sector group protection in the system. By performing a read operation at the address location XX02H with the higher order address bits A18, A19, and A20 set to the desired sector group address, the device will return 01H for a protected sector group and 00H for a non-protected sector group. Table 2. Am29F016 Sector Protection Verify Autoselect Codes * Outputs 01H at protected sector addresses Type A18 to A20 A6 A1 A0 Code (HEX) DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 Manufacturer Code –AMD XXX VIL VIL VIL 01H 000 0000 1 Am29F016 Device X X X VIL VIL VIH ADH 101 0110 1 Sector Group Protection Sector Group Address VIL VIH VIL 01H* 000 0000 1 |
类似零件编号 - AM29F016-75SC |
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类似说明 - AM29F016-75SC |
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