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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AM29LV800T-100 Datenblatt(PDF) 11 Page - Advanced Micro Devices |
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AM29LV800T-100 Datenblatt(HTML) 11 Page - Advanced Micro Devices |
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11 / 48 page  Am29LV800T/Am29LV800B 11 PRELIMINARY Autoselect The Autoselect mode allows the reading out of a binary code from the device and will identify its manufacturer and type. The intent is to allow programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. The Autoselect command may also be used to check the status of write-protected sectors (see Table 3). This mode is functional over the entire temperature range of the device. To activate this mode, the programming equipment must force VID (11.5–12.5 volts) 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 Am29LV800 is erased or programmed in a system without access to high voltage on the A9 pin. The command sequence is illustrated in Table 6. Byte 0 (A0 = VIL) represents the manufacturer’s code and byte 1 (A0 = VIH) the device identifier code. These two bytes are given for the Am29LV800 in Table 3. All identifiers for manufacturer and device exhibit odd parity with DQ7 defined as the parity bit. In order to read the proper device codes when executing Autose- lect, A1 must be VIL (see Table 3). For device identifica- tion in word mode (BYTE = VIH), DQ9 and DQ13 are equal to ‘1’ and DQ8, DQ10–12, DQ14, and DQ15 are equal to ‘0’. If BYTE = VIH (for word mode), the device code is 22DAh (for top boot block) or 225Bh (for bottom boot block). If BYTE = VIL (for byte mode), the device code is DAh (for top boot block) or 5Bh (for bottom boot block). In order to determine which sectors are write protected, A1 must be at VIH while running through the sector addresses. If the selected sector is protected, the device outputs a ‘1’ on DQ0. Table 3. Autoselect/Sector Protection Codes X = Don’t care. * Outputs 01h at protected sector addresses. Type Mode A12–A18 A6 A1 A0 Code (HEX) DQ8–DQ15 DQ 7 DQ 6 DQ 5 DQ 4 DQ 3 DQ 2 DQ 1 DQ 0 Manufacturer Code: AMD X L L L 01h High-Z 00000001 29LV800 Device (Top Boot Block) Word X LL H 22DAh DQ9 = 1, DQ13 = 1, Others = 0 11011010 Byte X DAh High-Z 29LV800 Device (Bottom Boot Block) Word X LL H 225Bh DQ9 = 1, DQ13 = 1, Others = 0 01011011 Byte X 5Bh High-Z Sector Protection Set Sector Addresses L H L 01h* X 00000001 |
Ähnliche Teilenummer - AM29LV800T-100 |
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Ähnliche Beschreibung - AM29LV800T-100 |
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