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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM29LV641GH70EI 데이터시트(PDF) 18 Page - SPANSION |
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AM29LV641GH70EI 데이터시트(HTML) 18 Page - SPANSION |
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18 / 55 page  19 Am29LV641G June 14, 2005 ADV ANCE I N FO RMAT I O N 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 c o rresponding progra mm ing algorithm. However, the autoselect codes can also be accessed in-system through the command register. When using programming equipment, the autoselect mode requires V ID (8.5 V to 12.5 V) on address pin A9. Address pins A6, A1, and A0 must be as shown in Table 3. In addition, when verifying sector protection, the sector address must appear on the appropriate highest order address bits (see Table 2). Table 3 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 corre- sponding 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. This method does not require V ID. Refer to the Autoselect Com- mand Sequence section for more information. Table 3. Autoselect Codes, (High Voltage Method) Legend: L = Logic Low = V IL, H = Logic High = VIH, SA = Sector Address, X = Don’t care. Note: SecSi™ Sector Indicator Bit (DQ7) exist only in the Am29LV641GH/L devices. Description CE# OE# WE# A21 to A15 A14 to A10 A9 A8 to A7 A7 to A0 A6 A5 to A2 A1 A0 DQ15 to DQ0 Manufacturer ID: AMD LL H X X V ID X — L X L L XX01h Read Cycle 1 L L H X X V ID X — L X L H 22D7h Read Cycle 2 L L H X X V ID 0Eh L L H 220Fh Read Cycle 3 L L H X X V ID 0Fh L L H XX00h Sector Protection Verification LL H SA X V ID X— L X H L 01h (protected), 00h (unprotected) SecSi ™ Sector Indicator Bit (DQ7) LL H X X V ID X— L X H H 98h (factory locked), 18h (not factory locked) SecSi ™ Sector Indicator Bit (DQ7), WP# protects highest address sector LL H X X V ID X— L X H H XX98h (factory locked), XX18h (not factory locked) SecSi ™ Sector Indicator Bit (DQ7), WP# protects lowest address sector LL H X X V ID X— L X H H XX88h (factory locked), XX08h (not factory locked) |
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