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SST34HF3244C Datenblatt(PDF) 6 Page - Silicon Storage Technology, Inc |
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SST34HF3244C Datenblatt(HTML) 6 Page - Silicon Storage Technology, Inc |
6 / 40 page 6 Data Sheet 32 Mbit Concurrent SuperFlash + 4 Mbit SRAM ComboMemory SST34HF3244C ©2006 Silicon Storage Technology, Inc. S71282-02-000 8/06 Software Data Protection (SDP) The SST34HF3244C provide the JEDEC standard Soft- ware Data Protection scheme for all data alteration opera- tions, i.e., Program and Erase. Any Program operation requires the inclusion of the 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 sequence. The SST34HF3244C are shipped with the Software Data Protection permanently enabled. See Table 6 for the specific software command codes. During SDP command sequence, invalid commands will abort the device to Read mode within TRC. The contents of DQ15- DQ8 are “Don’t Care” during any SDP command sequence. Common Flash Memory Interface (CFI) These devices also contain the CFI information to describe the characteristics of the devices. In order to enter the CFI Query mode, the system must write the three-byte sequence, same as the Software ID Entry com- mand with 98H (CFI Query command) to address BKX555H in the last byte sequence. In order to enter the CFI Query mode, the system can also use the one-byte sequence with BKX55H on Address and 98H on Data Bus. See Figure 16 for CFI Entry and Read timing diagram. Once the device enters the CFI Query mode, the system can read CFI data at the addresses given in Tables 7 through 9. The system must write the CFI Exit command to return to Read mode from the CFI Query mode. Security ID The SST34HF3244C devices offer a 136-word Security ID space. The Secure ID space is divided into two seg- ments—one 128-bit factory programmed segment and one 128-word (256-byte) user-programmed segment. The first segment is programmed and locked at SST with a unique, 128-bit number. The user segment is left un-programmed for the customer to program as desired. To program the user segment of the Security ID, the user must use the Security ID Program command. End-of-Write status is checked by reading the toggle bits. Data# Polling is not used for Security ID End-of-Write detection. Once programming is complete, the Sec ID should be locked using the User-Sec-ID-Program-Lock-Out. This disables any future corruption of this space. Note that regardless of whether or not the Sec ID is locked, neither Sec ID seg- ment can be erased. The Secure ID space can be queried by executing a three-byte command sequence with Query- Sec-ID command (88H) at address 555H in the last byte sequence. To exit this mode, the Exit-Sec-ID command should be executed. Refer to Table 6 for more details. |
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