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AT45DB321C-CNU Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT45DB321C-CNU Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 37 page 11 AT45DB321C [Preliminary] 3387B–DFLSH–9/04 Manufacturer and Device ID Read This instruction conforms to the JEDEC standard and allows the user to read the Manufacturer ID, Device ID, and Extended Device Information. A 1-byte opcode, 9FH, must be clocked into the device while the CS pin is low. After the opcode is clocked in, the Manufacturer ID, 2 bytes of Device ID and Extended Device Information will be clocked out on the SO pin. The fourth byte of the sequence output is the Extended Device Information String Length byte. This byte is used to signify how many bytes of Extended Device Information will be output. Manufacturer and Device ID Information Note: Based on JEDEC publication 106 (JEP106), Manufacturer ID data can be comprised of any number of bytes. Some manufacturers may have Manufacturer ID codes that are two, three or even four bytes long with the first byte(s) in the sequence being 7FH. A system should detect code 7FH as a “Continuation Code” and continue to read Manufacturer ID bytes. The first non-7FH byte would signify the last byte of Manufacturer ID data. For Atmel (and some other manufacturers), the Manufacturer ID data is comprised of only one byte. Byte 1 – Manufacturer ID Hex Value JEDEC Assigned Code Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 1FH 0 00 11 11 1 Manufacturer ID 1FH = Atmel Byte 2 – Device ID (Part 1) Hex Value Family Code Density Code Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Family Code 001 = DataFlash 27H 0 0 1 0 0 1 1 1 Density Code 00111 = 32-Mbit Byte 3 – Device ID (Part 2) Hex Value MLC Code Product Version Code Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 MLC Code 000 = 1-bit/Cell Technology 00H 0 0 0 0 0 0 0 0 Product Version 00000 = Initial Version Byte 4 – Extended Device Information String Length Hex Value Byte Count Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 00H 0 0 0 0 0 0 0 0 Byte Count 00H = 0 Bytes of Information 9FH Manufacturer ID Byte n Device ID Byte 1 Device ID Byte 2 This information would only be output if the Extended Device Information String Length value was something other than 00H. Extended Device Information String Length Extended Device Information Byte x Extended Device Information Byte x + 1 CS 1FH 27H 00H 00H Data Data SI SO Opcode Each transition represents 8 bits and 8 clock cycles |
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