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SST29SF040-55-4I-WH bảng dữ liệu(PDF) 3 Page - Silicon Storage Technology, Inc |
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3 / 22 page Data Sheet 4 Mbit Small-Sector Flash SST29SF040 / SST29VF040 3 ©2004 Silicon Storage Technology, Inc. S71160-10-000 2/04 Data# Polling (DQ7) When the SST29SF040 and SST29VF040 devices are in the internal Program operation, any attempt to read DQ7 will produce the complement of the true data. Once the Program operation is completed, DQ7 will produce true data. Note that even though DQ7 may have valid data immediately following the completion of an internal Write operation, the remaining data outputs may still be invalid: valid data on the entire data bus will appear in subsequent successive Read cycles after an interval of 1 µs. During internal Erase operation, any attempt to read DQ7 will produce a ‘0’. Once the internal Erase operation is completed, DQ7 will produce a ‘1’. The Data# Polling is valid after the rising edge of fourth WE# (or CE#) pulse for Program operation. For Sector- or Chip-Erase, the Data# Polling is valid after the rising edge of sixth WE# (or CE#) pulse. See Figure 6 for Data# Polling timing dia- gram and Figure 16 for a flowchart. Toggle Bit (DQ6) During the internal Program or Erase operation, any con- secutive attempts to read DQ6 will produce alternating ‘0’s and ‘1’s, i.e., toggling between 0 and 1. When the internal Program or Erase operation is completed, the toggling will stop. The device is then ready for the next operation. 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 7 for Toggle Bit timing dia- gram and Figure 16 for a flowchart. Data Protection The SST29SF040 and SST29VF040 devices 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 2.5V for SST29SF040. The Write operation is inhibited when VDD is less than 1.5V. for SST29VF040. 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 SST29SF040 and SST29VF040 provide the JEDEC approved Software Data Protection scheme for all data alteration operations, i.e., Program and Erase. Any Pro- gram 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 a six-byte load sequence. These 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. Product Identification The Product Identification mode identifies the devices as SST29SF040 or SST29VF040 and manufacturer as SST. This mode may be accessed by software operations. Users may use the Software Product Identification operation to identify the part (i.e., using the device ID) when using multi- ple manufacturers in the same socket. For details, see Table 4 for software operation, Figure 10 for the Software ID Entry and Read timing diagram and Figure 17 for the Soft- ware 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 accom- plished by issuing the Software ID Exit command sequence, which returns the device to the Read operation. Please note that the Software ID Exit command is ignored during an internal Program or Erase operation. See Table 4 for software command codes, Figure 11 for timing wave- form, and Figure 17 for a flowchart. TABLE 1: PRODUCT IDENTIFICATION Address Data Manufacturer’s ID 0000H BFH Device ID SST29SF040 0001H 13H SST29VF040 0001H 14H T1.2 1160 |
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Mô tả tương tự - SST29SF040-55-4I-WH |
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