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SST39SF040-55-4C-WHE Datasheet(PDF) 9 Page - Microchip Technology |
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SST39SF040-55-4C-WHE Datasheet(HTML) 9 Page - Microchip Technology |
9 / 29 page ©2002-2016 DS20005022C 04/16 9 1 Mbit / 2 Mbit / 4 Mbit Multi-Purpose Flash SST39SF010A / SST39SF020A / SST39SF040 Data Sheet Software Data Protection (SDP) The SST39SF010A/020A/040 provide the JEDEC approved Software Data Protection scheme for all data alteration operations, i.e., Program and Erase. Any Program operation requires the inclusion of a series of three-byte sequence. The three-byte load sequence is used to initiate the Program operation, providing optimal protection from inadvertent Write operations, e.g., during the system power-up or power-down. Any Erase operation requires the inclusion of six-byte load sequence. The SST39SF010A/020A/040 devices are shipped with the Software Data Protection permanently enabled. See Table 4 for the specific software command codes. During SDP command sequence, invalid commands will abort the device to read mode, within TRC. Product Identification The Product Identification mode identifies the device as the SST39SF040, SST39SF010A, or SST39SF020A and manufacturer as SST. This mode may be accessed by software operations. Users may wish to use the software Product Identification operation to identify the part (i.e., using the device ID) when using multiple manufacturers in the same socket. For details, Table 4 for software operation, Figure 12 for the software ID entry and read timing diagram and Figure 18 for the ID entry command sequence flowchart. Product Identification Mode Exit/Reset In order to return to the standard Read mode, the Software Product Identification mode must be exited. Exit is accomplished by issuing the Exit ID command sequence, which returns the device to the Read operation. Please note that the software reset command is ignored during an internal Program or Erase operation. See Table 4 for software command codes, Figure 13 for timing waveform and Figure 18 for a flowchart. Table 2: Product Identification Address Data Manufacturer’s ID 0000H BFH Device ID SST39SF010A 0001H B5H SST39SF020A 0001H B6H SST39SF040 0001H B7H T2.2 25022 |
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