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SST39LF100-70-4I-WI Datasheet(PDF) 3 Page - Silicon Storage Technology, Inc |
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SST39LF100-70-4I-WI Datasheet(HTML) 3 Page - Silicon Storage Technology, Inc |
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3 / 22 page  Data Sheet 1 Mbit Multi-Purpose Flash SST39LF100 / SST39VF100 3 ©2001 Silicon Storage Technology, Inc. S71129-02-000 6/01 363 Toggle Bit (DQ6) During the internal Program or Erase operation, any con- secutive attempts to read DQ6 will produce alternating 1s and 0s, i.e., toggling between 1 and 0. When the internal Program or Erase operation is completed, the DQ6 bit will stop toggling. The device is then ready for the next opera- tion. The Toggle Bit is valid after the rising edge of fourth WE# (or CE#) pulse for Program operation. For Sector- or Chip-Erase, the Toggle Bit is valid after the rising edge of sixth WE# (or CE#) pulse. See Figure 6 for Toggle Bit tim- ing diagram and Figure 14 for a flowchart. Data Protection The SST39LF/VF100 provide both hardware and software features to protect nonvolatile data from inadvertent writes. Hardware Data Protection Noise/Glitch Protection: A WE# or CE# 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, CE# high, or WE# high will inhibit the Write operation. This prevents inadvert- ent Writes during power-up or power-down. Software Data Protection (SDP) The SST39LF/VF100 provide the JEDEC approved 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 SST39LF/VF100 devices are shipped with the Software Data Protection permanently enabled. See Table 4 for the specific software command codes. During SDP command sequence, invalid com- mands will abort the device to Read mode within TRC. The contents of DQ15-DQ8 are “Don’t Care” during any SDP command sequence. Product Identification The Product Identification mode identifies the devices as SST39LF100 and SST39VF100 and manufacturer as SST. This mode may be accessed by software operations. Users may use the Software Product Identification opera- tion to identify the part (i.e., using the device ID) when using multiple manufacturers in the same socket. For details, see Table 4 for software operation, Figure 9 for the Software ID Entry and Read timing diagram, and Figure 15 for the Soft- ware ID Entry command sequence flowchart. Product Identification Mode Exit/ CFI Mode Exit In order to return to the standard Read mode, the Software Product Identification mode must be exited. Exit is accom- plished by issuing the Software ID Exit command sequence, which returns the device to the Read mode. This command may also be used to reset the device to the Read mode after any inadvertent transient condition that apparently causes the device to behave abnormally, e.g., not read correctly. Please note that the Software ID Exit/ CFI Exit command is ignored during an internal Program or Erase operation. See Table 4 for software command codes, Figure 10 for timing waveform and Figure 15 for a flowchart. TABLE 1: PRODUCT IDENTIFICATION Address Data Manufacturer’s ID 0000H 00BFH Device ID SST39LF/VF100 0001H 2788H T1.3 363 |
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