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GD5F1GQ4UEZFS Arkusz danych(PDF) 24 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD5F1GQ4UEZFS Arkusz danych(HTML) 24 Page - GigaDevice Semiconductor (Beijing) Inc. |
24 / 60 page SPI(x1/x2/x4) NAND Flash 1G 24 9.2 Read UID 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. Bytes Value 0-15 UID 16-31 UID complement (bit-wise) The Read UID command sequence is as follows: 1. Use EDh+00h read UID from array to cache. 2. Use 0FH (GET FEATURES command ) read the status 3. User can use Read from cache command (03H/0BH/3BH/6BH/BBH/EBH), read UID from cache. Read UID to Cache (EDH+00H) + Get Feature (0FH) Figure9-2. Read UID to cache and Get Feature command Sequence Diagram Command 0 1 2 3 4 5 6 7 EDH CS# SCLK SI SO High-Z 8 9 10 Command CS# Get Feature 0 1 2 3 4 5 6 7 0FH CS# SLK SI SO High-Z 8 9 10 11 12 13 14 15 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 MSB 1 byte address Data byte MSB SCLK SI SO tCS 16 17 18 19 20 21 22 23 24 00H 11 14 12 13 15 |
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