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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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GD9FS1G8F2ALG датащи(PDF) 31 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD9FS1G8F2ALG датащи(HTML) 31 Page - GigaDevice Semiconductor (Beijing) Inc. |
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31 / 55 page  GD9Fx1GxF2A 31 8.5.2 Read Unique ID (EDH) The Read Unique ID function is used to retrieve the 16 byte unique ID (UID) for the device. The unique ID when combined with the device manufacturer shall be unique. The UID data may be stored within the Flash array. To allow the host to determine if the UID is without bit errors, the UID is returned with its complement. If the XOR of the UID and its bit-wise complement is all ones, then the UID is valid. To accommodate robust retrieval of the UID in the case of bit errors, sixteen copies of the UID and the corresponding complement shall be stored by the target. For example, reading bytes 32-63 returns to the host another copy of the UID and its complement. To change the data output location, it is recommended to use the Random Data Out command set (05H-E0H).The Status Read command (70H) can be used to check the completion. To continue the read operation, a following read command (00h) to re-enable the data out is necessary. Bytes Value 0-15 UID 16-31 UID complement (bit-wise) CLE 00H U00 U10 U01 U11 … … WE# ALE RE# EDH IO0-7 R/B# tR Figure26: Read Unique ID Timing |
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