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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SST34HF1681J 데이터시트(PDF) 5 Page - Silicon Storage Technology, Inc |
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SST34HF1681J 데이터시트(HTML) 5 Page - Silicon Storage Technology, Inc |
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5 / 37 page  Data Sheet 16 Mbit Concurrent SuperFlash + 4/8 Mbit PSRAM ComboMemory SST34HF1641J / SST34HF1681J 5 ©2006 Silicon Storage Technology, Inc. S71336-00-000 8/06 Data Protection The SST34HF16x1J provide both hardware and software features to protect nonvolatile data from inadvertent writes. Hardware Data Protection Noise/Glitch Protection: A WE# or BEF# pulse of less than 5 ns will not initiate a Write cycle. VDD Power Up/Down Detection: The Write operation is inhibited when VDD is less than 1.5V. Write Inhibit Mode: Forcing OE# low, BEF# high, or WE# high will inhibit the Write operation. This prevents inadvert- ent writes during power-up or power-down. Hardware Block Protection The SST34HF16x1J provide a hardware block protection which protects the outermost 8 KWord in Bank 1. The block is protected when WP# is held low. See Figures 2 and 3 for Block-Protection location. A user can disable block protection by driving WP# high thus allowing erase or program of data into the protected sectors. WP# must be held high prior to issuing the write command and remain stable until after the entire Write operation has completed. If WP# is left floating, it is inter- nally held high via a pull-up resistor, and the Boot Block is unprotected, enabling Program and Erase operations on that block. Hardware Reset (RST#) The RST# pin provides a hardware method of resetting the device to read array data. When the RST# pin is held low for at least TRP, any in-progress operation will terminate and return to Read mode, see Figure 21. When no internal Pro- gram/Erase operation is in progress, a minimum period of TRHR is required after RST# is driven high before a valid Read can take place, see Figure 20. The Erase operation that has been interrupted needs to be reinitiated after the device resumes normal operation mode to ensure data integrity. See Figures 20 and 21 for timing diagrams. Software Data Protection (SDP) The SST34HF16x1J 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 SST34HF16x1J are shipped with the Software Data Protection permanently enabled. See Table 5 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 command with 98H (CFI Query command) to address 555H in the last byte sequence. For CFI Entry and Bead timing diagram, See Figure 18. Once the device enters the CFI Query mode, the system can read CFI data a t the addresses given in Tables 7 and 9. The system must write the CFI Exit command to return to Bead mode from the CFI Query mode. Security ID The SST34HF16x1J devices offer a 256-bit Security ID space. The Secure ID space is divided into two 128-bit seg- ments—one factory programmed segment and one 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 pro- gram 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, nei- ther Sec ID segment 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 5 for more details. |
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