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AM29LV652DU12RMAE 데이터시트(PDF) 21 Page - SPANSION |
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AM29LV652DU12RMAE 데이터시트(HTML) 21 Page - SPANSION |
21 / 55 page October 29, 2004 Am29LV652D 19 PRELI M INARY Autoselect Mode The autoselect mode provides manufacturer and de- vice identification, and sector protection verification, through identifier codes output on DQ7–DQ0. This mode is primarily intended for programming equip- ment to automatically match a device to be pro- grammed 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 A9. Addresses A6, A1, and A0 must be as shown in Table 4, on page 19. In addition, when verifying sector protection, the sector address must appear on the ap- propriate highest order address bits (see Table 2, on page 11 and Table 3, on page 15). Table 4 shows the remaining address bits that are don’t care. When all necessary bits have been set as required, the pro- gramming equipment may then read the correspond- ing 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, on page 30. This method does not require VID. Refer to the “Au- toselect Command Sequence” on page 26 section for more information. Table 4. Am29LV652D Autoselect Codes, (High Voltage Method) Legend: L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care. Notes: 1. CE# can be replaced with CE2# when referring to the second die in the package. 2. The device ID’s used for the Am29LV652 are the same as the Am29LV065, because the Am29LV652 uses two Am29LV065 dice and appears to the system as two Am29LV065 devices. Description CE# OE# WE# A22 to A16 A15 to A10 A9 A8 to A7 A6 A5 to A2 A1 A0 DQ7 to DQ0 Manufacturer ID: AMD L L H X X VID XLX L L 01h Device ID: Am29LV652D L L H X X VID XLX L H 93h Sector Protection Verification LL H SAX VID XLX H L 01h (protected), 00h (unprotected) |
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