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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM29BDS128H датащи(PDF) 52 Page - SPANSION |
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AM29BDS128H датащи(HTML) 52 Page - SPANSION |
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52 / 89 page  50 Am29BDS128H/Am29BDS640H 27024B3 May 10, 2006 D A TA SH EE T Figure 9. Toggle Bit Algorithm DQ2: Toggle Bit II The “Toggle Bit II” on DQ2, when used with DQ6, indi- cates whether a particular sector is actively erasing (that is, the Embedded Erase algorithm is in progress), or whether that sector is erase-suspended. Toggle Bit II is valid after the rising edge of the final WE# pulse in the command sequence. DQ2 toggles when the system reads at addresses within those sectors that have been selected for era- sure. But DQ2 cannot distinguish whether the sector is actively erasing or is erase-suspended. DQ6, by com- parison, indicates whether the device is actively erasing, or is in Erase Suspend, but cannot distinguish which sectors are selected for erasure. Thus, both status bits are required for sector and mode informa- tion. Refer to Table 22, “DQ6 and DQ2 Indications,” on page 51 to compare outputs for DQ2 and DQ6. See the following for additional information: Figure 9, “Toggle Bit Algorithm,” on page 50, “DQ6: Toggle Bit I” on p a g e 49 , F i gu re 41, “ To ggle Bit Tim i n g s (During Embedded Algorithm),” on page 76, and Table 22, “DQ6 and DQ2 Indications,” on page 51. START No Yes Yes DQ5 = 1? No Yes DQ6 = Toggle? No Read Byte (DQ7-DQ0) Address = VA DQ6 = Toggle? Read Byte Twice (DQ7-DQ0) Adrdess = VA Read Byte (DQ7-DQ0) Address = VA FAIL PASS Note:The system should recheck the toggle bit even if DQ5 = “1” because the toggle bit may stop toggling as DQ5 changes to “1.” See the subsections on DQ6 and DQ2 for more information. |
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