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W39V080FAQZ Datasheet(PDF) 8 Page - Winbond |
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W39V080FAQZ Datasheet(HTML) 8 Page - Winbond |
8 / 35 page W39V080FA - 8 - After an erase command sequence is written, if all sectors selected for erasing are protected, DQ6 toggles for about 100 μS, and then returns to reading array data. If not all selected sectors are protected, the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected sectors which are protected. The system can use DQ6 to determine whether a sector is actively erasing. If the device is actively erasing (i.e., the Embedded Erase algorithm is in progress), DQ6 toggles. If a program address falls within a protected sector, DQ6 toggles for about 1 μs after the program command sequence is written, and then returns to reading array data. 6.10.4 DQ5: Exceeded Timing Limits DQ5 indicates whether the program or erase time has exceeded a specified internal pulse count limit. DQ5 produces “1” under these conditions which indicates that the program or erase cycle was not successfully completed. The device may output “1” on DQ5 if the system tries to program “1” to a location that was previously programmed to “0.” Only the erase operation can change “0” back to “1.” Under this condition, the device stops the operation, and while the timing limit has been exceeded, DQ5 produces “1.” Under both these conditions, the system must hardware reset to return to the read mode. 6.11 Identification Input pin ID[3:0] These pins are part of mechanism that allows multiple parts to be used on the same bus. The boot device should be 0000b. And all the subsequent parts should use the up-count strapping. 6.12 Register There are three kinds of registers on this device, the General Purpose Input Registers, the Block Lock Control Registers and Product Identification Registers. Users can access these registers through respective address in the 4Gbytes memory map. There are detail descriptions in the sections below. 6.12.1 General Purpose Inputs Register This register reads the FGPI[4:0] pins on the W39V080FA.This is a pass-through register which can read via memory address FFBC0100(hex). Since it is pass-through register, there is no default value. GPI Register Table BIT FUNCTION 7 − 5 Reserved 4 Read FGPI4 pin status 3 Read FGPI3 pin status 2 Read FGPI2 pin status 1 Read FGPI1 pin status 0 Read FGPI0 pin status 6.12.2 Block Locking Registers This part provides 16 even 64Kbytes blocks, and each block can be locked by register control. These control registers can be set or clear through memory address. Below is the detail description. |
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